From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Mon, 28 Jul 2025 00:41:43 +0000 (+0300)
Subject: initial commit
X-Git-Url: http://www2.svjatoslav.eu/gitweb/?a=commitdiff_plain;h=92913ff8b74e684c3ca6f4bd428ed036c63e6d57;p=qbasicapps.git

initial commit
---

92913ff8b74e684c3ca6f4bd428ed036c63e6d57
diff --git a/.gitignore b/.gitignore
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index 0000000..17a01d0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,12 @@
+/qbasicapps.iml
+/.idea/
+/VC.COM
+/VC.INI
+/QB45
+/index.html
+/Graphics/3D/3D Synthezier/doc/index.html
+/Math/Truth table calculator/doc/index.html
+/Graphics/Spirals/index.html
+/Graphics/index.html
+/2D GFX/Animations/index.html
+/3D GFX/3D Synthezier/index.html
\ No newline at end of file
diff --git a/.project b/.project
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+++ b/.project
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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>QBasicApps</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+	</buildSpec>
+	<natures>
+	</natures>
+</projectDescription>
diff --git a/2D GFX/Animations/2D rotation.bas b/2D GFX/Animations/2D rotation.bas
new file mode 100755
index 0000000..f7e3af4
--- /dev/null
+++ b/2D GFX/Animations/2D rotation.bas	
@@ -0,0 +1,64 @@
+' This program showcases the rotation of points on an X-Y coordinate
+' system using trigonometric functions, specifically sine and cosine. By
+' simulating the effect of rotating a collection of grid points around
+' the origin, it demonstrates the mathematical principles behind 2D
+' rotation.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2003.12, Initial version
+' 2024, Improved program readability
+
+DIM SHARED pointXCoordinates(1000) ' Array to store x coordinates of points
+DIM SHARED pointYCoordinates(1000) ' Array to store y coordinates of points
+DIM SHARED oldPointXCoordinates(1000) ' Array to store previous x coordinates of points
+DIM SHARED oldPointYCoordinates(1000) ' Array to store previous y coordinates of points
+
+SCREEN 13
+
+numPoints = 0 ' Initialize the number of points
+FOR pointXVal = -10 TO 10
+    FOR pointYVal = -10 TO 10
+        numPoints = numPoints + 1
+        pointXCoordinates(numPoints) = pointXVal
+        pointYCoordinates(numPoints) = pointYVal
+    NEXT pointYVal
+NEXT pointXVal
+
+' Main rotation loop
+rotationAngle = 0 ' Initialize the rotation angle to 0
+
+1
+    rotationAngle = rotationAngle + .01  ' Increment the rotation angle by 0.01 radians
+
+    ' Calculate the sine and cosine of the current rotation angle
+    sineOfRotationAngle = SIN(rotationAngle)
+    cosineOfRotationAngle = COS(rotationAngle)
+
+    FOR pointIndex = 1 TO numPoints
+        PSET (oldPointXCoordinates(pointIndex), oldPointYCoordinates(pointIndex)), 0 ' Clear the previous position
+
+        xCoordinate = pointXCoordinates(pointIndex)
+        yCoordinate = pointYCoordinates(pointIndex)
+
+        ' Calculate the new x and y coordinate after rotation
+        newXCoordinate = xCoordinate * sineOfRotationAngle + yCoordinate * cosineOfRotationAngle
+        newYCoordinate = xCoordinate * cosineOfRotationAngle - yCoordinate * sineOfRotationAngle
+
+        ' Scale and translate the new x and y coordinates to the center of the screen
+        newXCoordinate = newXCoordinate * 7 + 160
+        newYCoordinate = newYCoordinate * 7 + 100
+
+        ' Store x and y on-screen coordinates for clearing on next iteration
+        oldPointXCoordinates(pointIndex) = newXCoordinate
+        oldPointYCoordinates(pointIndex) = newYCoordinate
+
+        PSET (newXCoordinate, newYCoordinate), 15 ' Draw the point at the new position
+    NEXT pointIndex
+
+IF INKEY$ = "" THEN GOTO 1 ' Continue rotating if no key is pressed
+
diff --git a/2D GFX/Animations/2D rotation.webm b/2D GFX/Animations/2D rotation.webm
new file mode 100644
index 0000000..d3384d3
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diff --git a/2D GFX/Animations/Bump mapping.bas b/2D GFX/Animations/Bump mapping.bas
new file mode 100755
index 0000000..ba65e7d
--- /dev/null
+++ b/2D GFX/Animations/Bump mapping.bas	
@@ -0,0 +1,133 @@
+DECLARE SUB paintSurface ()
+' Program renders bump mapping animation where light source moves around.
+' Based on light source location, different parts of the surface become illuminated.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' ?, Initial version
+' 2024, Improved program readability
+
+DECLARE SUB makeSurface ()
+DECLARE SUB animate ()
+DECLARE SUB makeDot (x!, y!)
+DECLARE SUB paintImage ()
+SCREEN 13
+
+' surface height map
+DIM SHARED imgHeight(0 TO 50, 0 TO 50)
+
+PAINT (0, 0), 1
+
+makeSurface
+paintSurface
+animate
+
+SUB animate
+
+    frame = 0
+1
+    ' Increment the frame counter
+    frame = frame + 5
+
+    ' Calculate light position based on sine functions
+    lightX = SIN(frame / 100) * 20 + 25
+    lightY = SIN(frame / 71.32) * 20 + 25
+    lightX = lightX + SIN(frame / 34) * 10
+    lightY = lightY + SIN(frame / 45) * 10
+
+    ' Calculate brightness for each pixel based on distance and angle from light
+    FOR y = 2 TO 48
+        FOR x = 2 TO 48
+            distance = SQR((x - lightX) ^ 2 + (y - lightY) ^ 2)
+            brightness = (30 - distance) / 4
+
+            ' Calculate surface inclination relative to light location
+            value = imgHeight(x - 1, y) - imgHeight(x, y)
+            brightnessX = (lightX - x) * value
+
+            value = imgHeight(x, y - 1) - imgHeight(x, y)
+            brightnessY = (lightY - y) * value
+
+            brightness = brightness + (brightnessX + brightnessY) / (distance / 2)
+
+            ' Clamp brightness within valid range
+            IF brightness < 0 THEN brightness = 0
+            IF brightness > 15 THEN brightness = 15
+
+            ' Set pixel color based on brightness
+            PSET (x + 150, y), 16 + brightness
+        NEXT x
+    NEXT y
+
+    ' Draw light source as a circle
+    CIRCLE (lightX + 150, lightY), 2, 12
+
+
+    ' Loop back to the start of animation until
+    ' no key has been pressed by the user.
+    IF INKEY$ = "" THEN GOTO 1
+
+END SUB
+
+' Current subroutine creates somewhat fat round dot.
+' Center of the dot is fully elevated.
+' There is smooth drop-off in elevation from the center.
+SUB makeDot (x, y)
+
+    FOR x1 = -10 TO 10
+        FOR y1 = -10 TO 10
+            distanceFromCenter = SQR(x1 * x1 + y1 * y1)
+            height = 4 - distanceFromCenter
+            IF height < 0 THEN height = 0
+
+            ' Calculate image coordinates
+            imgX = x1 + x
+            imgY = y1 + y
+
+            ' Ensure coordinates are within bounds
+            IF imgX < 0 THEN imgX = 0
+            IF imgY < 0 THEN imgY = 0
+            IF imgX > 50 THEN imgX = 50
+            IF imgY > 50 THEN imgY = 50
+
+            ' Add power to the height map
+            imgHeight(imgX, imgY) = imgHeight(imgX, imgY) + height
+        NEXT y1
+    NEXT x1
+
+END SUB
+
+SUB makeSurface
+
+    ' Generate random dots on the surface
+    FOR x = 0 TO 10
+        CALL makeDot(RND * 50, RND * 50)
+    NEXT x
+
+    ' Add some lines composed from dots
+    FOR x = 0 TO 45 STEP 2
+        CALL makeDot(x, x / 2 + 5)
+    NEXT x
+
+    FOR x = 5 TO 30 STEP 2
+        CALL makeDot(x, -x / 1.2 + 30)
+    NEXT x
+
+END SUB
+
+SUB paintSurface
+
+    ' Paint the image based on height map
+    FOR x = 0 TO 50
+        FOR y = 0 TO 50
+            clr = imgHeight(x, y) + 16
+            PSET (x, y), clr
+        NEXT y
+    NEXT x
+
+END SUB
+
diff --git a/2D GFX/Animations/Bump mapping.webm b/2D GFX/Animations/Bump mapping.webm
new file mode 100644
index 0000000..4bf57e0
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diff --git a/2D GFX/Animations/DNA.bas b/2D GFX/Animations/DNA.bas
new file mode 100755
index 0000000..4d9237d
--- /dev/null
+++ b/2D GFX/Animations/DNA.bas	
@@ -0,0 +1,76 @@
+' Program to render animated DNA as seen in the movies.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' ?, Initial version
+' 2024, Improved program readability
+
+DIM SHARED xCoordinates(1 TO 100)
+DIM SHARED yCoordinates(1 TO 100)
+DIM SHARED zCoordinates(1 TO 100)
+DIM SHARED colorCodes(1 TO 100)
+
+SCREEN 7, , , 1
+
+1:
+b = 0
+rotationAngle = rotationAngle + 0.1
+FOR a = 1 TO 20
+    b = b + 1
+    ' Calculate x-coordinate using sine function and add to array
+    xCoordinates(b) = SIN(a / 2 + rotationAngle) * 30 + 150
+    ' Calculate z-coordinate using sine function and add to array
+    zCoordinates(b) = SIN(a / 2 + rotationAngle + 1.6) * 2 + 2
+    ' Calculate y-coordinate by multiplying a with 8 and adding z-coordinate
+    yCoordinates(b) = a * 8 + zCoordinates(b)
+    ' Assign color code to the current point
+    colorCodes(b) = 3
+
+    b = b + 1
+    ' Calculate x-coordinate using sine function and add to array
+    xCoordinates(b) = SIN(a / 2 + rotationAngle + 2.5) * 30 + 150
+    ' Calculate z-coordinate using sine function and add to array
+    zCoordinates(b) = SIN(a / 2 + rotationAngle + 1.6 + 2.5) * 2 + 2
+    ' Calculate y-coordinate by multiplying a with 8 and adding z-coordinate
+    yCoordinates(b) = a * 8 + zCoordinates(b)
+    ' Assign color code to the current point
+    colorCodes(b) = 4
+NEXT a
+
+' Clear the screen
+CLS
+
+' Draw lines and circles based on z-coordinate
+FOR b = 0 TO 4
+    IF b = 1 THEN
+        FOR a = 1 TO 40 STEP 2
+            ' Draw line between consecutive points
+            LINE (xCoordinates(a), yCoordinates(a))-(xCoordinates(a + 1), yCoordinates(a + 1)), 15
+        NEXT a
+    END IF
+
+    FOR a = 1 TO 40
+        ' Check if the current z-coordinate matches the loop variable b
+        IF int(zCoordinates(a)) = b THEN
+            ' Draw circle with specified color code
+            CIRCLE (xCoordinates(a), yCoordinates(a)), b + 5, colorCodes(a)
+            PAINT (xCoordinates(a), yCoordinates(a)), colorCodes(a)
+            ' Draw an black outline of the circle
+            CIRCLE (xCoordinates(a), yCoordinates(a)), b + 5, 0
+        END IF
+    NEXT a
+NEXT b
+
+' Copy the screen to buffer and clear the screen
+PCOPY 0, 1
+CLS
+
+' Check if any key is pressed
+IF INKEY$ = "" THEN GOTO 1
+
+' End the program
+SYSTEM
diff --git a/2D GFX/Animations/DNA.webm b/2D GFX/Animations/DNA.webm
new file mode 100644
index 0000000..794d6ad
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diff --git a/2D GFX/Animations/Orbiting particles.bas b/2D GFX/Animations/Orbiting particles.bas
new file mode 100755
index 0000000..f3653e6
--- /dev/null
+++ b/2D GFX/Animations/Orbiting particles.bas	
@@ -0,0 +1,67 @@
+' Projects animated particles in orbit around a central point.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' ?, Initial version
+' 2024, Improved program readability
+
+SCREEN 7, , , 1
+RANDOMIZE TIMER
+
+' Declare shared arrays to store particles
+DIM SHARED particleColor(1 TO 100)
+DIM SHARED particleX(1 TO 100)
+DIM SHARED particleAngle(1 TO 100)
+
+' Initialize the arrays with random values
+FOR a = 1 TO 100
+    particleColor(a) = RND * 15
+    particleX(a) = RND * 100
+    particleAngle(a) = RND * 100
+NEXT a
+
+' Main loop to draw the animated particles
+1
+CLS
+FOR a = 1 TO 50
+    ' Get current segment data
+    currentColor = particleColor(a)
+    currentParticleX = particleX(a)
+    currentparticleAngle = particleAngle(a)
+
+    ' Calculate the x and y coordinates for the current segment
+    xCoordinate = SIN(currentparticleAngle) * 25
+    yCoordinate = SIN(currentParticleX) * 20
+
+    ' Scale the coordinates
+    scaleFactor = (COS(currentparticleAngle) + 2) * 2
+    xCoordinate = xCoordinate * scaleFactor
+    yCoordinate = yCoordinate * scaleFactor
+
+    ' Draw the current particle as a circle
+    CIRCLE (xCoordinate + 160, yCoordinate + 100), scaleFactor, currentColor
+
+    ' Fill the inside of the circle with color
+    PAINT (xCoordinate + 160, yCoordinate + 100), currentColor
+
+    ' Draw a line from the center to the current particle
+    LINE (160, 100)-(xCoordinate + 160, yCoordinate + 100), currentColor
+
+    ' Rotate particle by small amount for next frame
+    particleAngle(a) = particleAngle(a) + .1
+NEXT a
+
+' Copy screen buffer 0 to screen buffer 1
+PCOPY 0, 1
+
+' Check for user input and exit if any key is pressed
+IF INKEY$ <> "" THEN SYSTEM
+
+' Use sound function with inaudible 0 Hz but fixed delay to slow down animation
+SOUND 0, 1
+
+' Go back to the main loop
+GOTO 1
diff --git a/2D GFX/Animations/Orbiting particles.webm b/2D GFX/Animations/Orbiting particles.webm
new file mode 100644
index 0000000..754e33e
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diff --git a/2D GFX/Animations/Polygon textured.bas b/2D GFX/Animations/Polygon textured.bas
new file mode 100755
index 0000000..12bc91d
--- /dev/null
+++ b/2D GFX/Animations/Polygon textured.bas	
@@ -0,0 +1,250 @@
+' Texture mapping demonstration.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.04, Initial version
+' 2024.08, Improved program readability
+
+DECLARE SUB Demo3 ()
+DECLARE SUB Demo2 ()
+DECLARE SUB Demo1 ()
+DECLARE SUB HLine (xCoord1!, yCoord!, xCoord2!, textureX1!, textureY1!, textureX2!, textureY2!)
+DECLARE SUB Polygon (xCoord1!, yCoord1!, xCoord2!, yCoord2!, xCoord3!, yCoord3!, textureX1!, textureY1!, textureX2!, textureY2!, textureX3!, textureY3!)
+DECLARE SUB PLine (xCoord1!, yCoord1!, xCoord2!, yCoord2!, textureX1!, textureY1!, textureX2!, textureY2!)
+DECLARE SUB Start ()
+
+DIM SHARED img(0 TO 100, 0 TO 100)
+DIM SHARED bufx(0 TO 199)
+DIM SHARED buftx(0 TO 199)
+DIM SHARED bufty(0 TO 199)
+
+Start
+Demo1
+Demo2
+Demo3
+SYSTEM
+
+SUB Demo1
+    ' Demonstrates texture mapping by drawing a polygon with predefined vertices and texture coordinates.
+    ' It waits for user input and then repeatedly draws polygons with random vertices and predefined texture coordinates.
+
+    ' Draw a polygon with predefined vertices and texture coordinates
+    Polygon 10, 10, 300, 80, 100, 180, 1, 1, 99, 1, 30, 99
+
+    ' Wait for user input
+    userInput$ = INPUT$(1)
+
+    ' Label to repeat the polygon drawing
+RepeatPolygonDrawing:
+    ' Generate random vertices for the polygon
+    vertexX1 = RND * 300 + 10
+    vertexX2 = RND * 300 + 10
+    vertexX3 = RND * 300 + 10
+    vertexY1 = RND * 180 + 10
+    vertexY2 = RND * 180 + 10
+    vertexY3 = RND * 180 + 10
+
+    ' Draw a polygon with random vertices and predefined texture coordinates
+    Polygon vertexX1, vertexY1, vertexX2, vertexY2, vertexX3, vertexY3, 1, 1, 99, 1, 30, 99
+
+    ' Repeat the process until a key is pressed
+    IF INKEY$ = "" THEN GOTO RepeatPolygonDrawing
+
+    ' Clear the screen
+    CLS
+END SUB
+
+SUB Demo2
+    ' Demonstrates texture mapping by drawing a polygon with vertices calculated using trigonometric functions.
+    ' It creates a rotating effect and repeatedly draws polygons with calculated vertices and predefined texture coordinates.
+
+    ' Initialize the angle variable
+    angle = 0
+
+    ' Label to repeat the polygon drawing
+RepeatRotatingPolygonDrawing:
+    ' Calculate the vertices of the polygon using trigonometric functions
+    vertexX1 = SIN(angle) * 80 + 160
+    vertexY1 = COS(angle) * 80 + 100
+    vertexX2 = SIN(angle + 2) * 80 + 160
+    vertexY2 = COS(angle + 2) * 80 + 100
+    vertexX3 = SIN(angle + 4) * 90 + 160
+    vertexY3 = COS(angle + 4) * 90 + 100
+
+    ' Draw a polygon with calculated vertices and predefined texture coordinates
+    Polygon vertexX1, vertexY1, vertexX2, vertexY2, vertexX3, vertexY3, 1, 1, 99, 1, 30, 99
+
+    ' Increment the angle variable
+    angle = angle + .1
+
+    ' Repeat the process until a key is pressed
+    IF INKEY$ = "" THEN GOTO RepeatRotatingPolygonDrawing
+
+    ' Clear the screen
+    CLS
+END SUB
+
+SUB Demo3
+    ' Demonstrates texture mapping by drawing a polygon with fixed vertices and rotating texture coordinates.
+    ' It creates a rotating effect for the texture while keeping the polygon location fixed on the screen.
+
+    ' Initialize the angle variable for texture rotation
+    textureAngle = 0
+
+    ' Label to repeat the polygon drawing with rotating texture coordinates
+RepeatTextureRotation:
+    ' Calculate the texture coordinates using trigonometric functions to create a rotating effect
+    textureX1 = SIN(textureAngle) * 40 + 50
+    textureY1 = COS(textureAngle) * 40 + 50
+    textureX2 = SIN(textureAngle + 2) * 40 + 50
+    textureY2 = COS(textureAngle + 2) * 40 + 50
+    textureX3 = SIN(textureAngle + 4) * 40 + 50
+    textureY3 = COS(textureAngle + 4) * 40 + 50
+
+    ' Draw a polygon with fixed vertices and rotating texture coordinates
+    Polygon 1, 50, 300, 1, 100, 180, textureX1, textureY1, textureX2, textureY2, textureX3, textureY3
+
+    ' Increment the texture angle variable
+    textureAngle = textureAngle + .1
+
+    ' Repeat the process until a key is pressed
+    IF INKEY$ = "" THEN GOTO RepeatTextureRotation
+
+    ' Clear the screen
+    CLS
+END SUB
+
+SUB HLine (xCoord1, yCoord, xCoord2, textureX1, textureY1, textureX2, textureY2)
+    ' Draws a horizontal line with texture mapping between two points.
+    ' It calculates texture coordinates for each pixel along the line and sets the pixel color accordingly.
+
+    ' Exit if the horizontal line has zero length
+    IF INT(xCoord2) = INT(xCoord1) THEN GOTO ExitHLine
+
+    ' Determine the direction and initialize variables
+    IF xCoord2 > xCoord1 THEN
+        normalizedX1 = INT(xCoord1)
+        normalizedX2 = INT(xCoord2)
+        normalizedTextureX1 = textureX1
+        normalizedTextureY1 = textureY1
+        normalizedTextureX2 = textureX2
+        normalizedTextureY2 = textureY2
+    ELSE
+        normalizedX1 = INT(xCoord2)
+        normalizedX2 = INT(xCoord1)
+        normalizedTextureX1 = textureX2
+        normalizedTextureY1 = textureY2
+        normalizedTextureX2 = textureX1
+        normalizedTextureY2 = textureY1
+    END IF
+
+    ' Calculate the line parameters
+    horizontalLength = normalizedX2 - normalizedX1
+    textureDeltaX = normalizedTextureX2 - normalizedTextureX1
+    textureDeltaY = normalizedTextureY2 - normalizedTextureY1
+
+    FOR pixelOffset = 0 TO horizontalLength
+        ' Calculate the texture coordinates for the current pixel
+        currentTextureX = textureDeltaX * pixelOffset / horizontalLength + normalizedTextureX1
+        currentTextureY = textureDeltaY * pixelOffset / horizontalLength + normalizedTextureY1
+
+        ' Set the pixel color using texture coordinates
+        PSET (pixelOffset + normalizedX1, yCoord), img(currentTextureX, currentTextureY)
+    NEXT pixelOffset
+
+ExitHLine:
+END SUB
+
+SUB PLine (xCoord1, yCoord1, xCoord2, yCoord2, textureX1, textureY1, textureX2, textureY2)
+    ' Draws a line with texture mapping between two points.
+    ' It calculates intermediate points along the line and uses the HLine subroutine to draw horizontal segments.
+
+    ' Calculate the number of vertical steps
+    verticalSteps = ABS(yCoord2 - yCoord1)
+    IF verticalSteps = 0 THEN GOTO ExitPLine
+
+    ' Calculate the differences in coordinates and texture coordinates
+    deltaY = yCoord2 - yCoord1
+    deltaX = xCoord2 - xCoord1
+    deltaTextureY = textureY2 - textureY1
+    deltaTextureX = textureX2 - textureX1
+
+    ' Loop through each vertical step
+    FOR stepCounter = 0 TO verticalSteps
+        ' Calculate the intermediate coordinates and texture coordinates
+        intermediateX = deltaX * stepCounter / verticalSteps + xCoord1
+        intermediateY = deltaY * stepCounter / verticalSteps + yCoord1
+        intermediateTextureX = deltaTextureX * stepCounter / verticalSteps + textureX1
+        intermediateTextureY = deltaTextureY * stepCounter / verticalSteps + textureY1
+
+        ' Check if the buffer is empty for this row
+        IF bufx(intermediateY) = -1 THEN
+            ' Store the intermediate coordinates and texture coordinates in the buffer
+            bufx(intermediateY) = intermediateX
+            buftx(intermediateY) = intermediateTextureX
+            bufty(intermediateY) = intermediateTextureY
+        ELSE
+            ' Draw a horizontal line using the stored and current intermediate coordinates and texture coordinates
+            HLine bufx(intermediateY), intermediateY, intermediateX, buftx(intermediateY), bufty(intermediateY), intermediateTextureX, intermediateTextureY
+        END IF
+    NEXT stepCounter
+
+ExitPLine:
+END SUB
+
+SUB Polygon (xCoord1, yCoord1, xCoord2, yCoord2, xCoord3, yCoord3, textureX1, textureY1, textureX2, textureY2, textureX3, textureY3)
+    ' Fills a triangular area by connecting the edges with texture mapping.
+    ' It uses the PLine subroutine to draw lines connecting the vertices of the polygon.
+
+    ' Initialize the buffer
+    FOR bufferIndex = 0 TO 199
+        bufx(bufferIndex) = -1
+    NEXT bufferIndex
+
+    ' Draw three lines connecting the vertices of the polygon
+    PLine xCoord1, yCoord1, xCoord2, yCoord2, textureX1, textureY1, textureX2, textureY2
+    PLine xCoord1, yCoord1, xCoord3, yCoord3, textureX1, textureY1, textureX3, textureY3
+    PLine xCoord3, yCoord3, xCoord2, yCoord2, textureX3, textureY3, textureX2, textureY2
+END SUB
+
+SUB Start
+    ' Set the screen mode to 320x200 with 256 colors
+    SCREEN 13
+
+    ' Prepare sample texture to be used later for textured polygons demonstration:
+
+    ' Draw random circles on the screen
+    FOR circleCounter = 1 TO 100
+        ' Generate random coordinates and color for each circle
+        xCoord = RND * 150
+        yCoord = RND * 150
+        circleColor = RND * 255
+
+        ' Draw a circle with random radius and fill it with the same color
+        CIRCLE (xCoord, yCoord), RND * 20 + 3, circleColor
+        PAINT (xCoord, yCoord), circleColor
+    NEXT circleCounter
+
+    ' Display "Test!" on the screen
+    LOCATE 8, 8
+    PRINT "Test!"
+
+    ' Wait for user input
+    userInput$ = INPUT$(1)
+
+    ' Copy the screen content to the image array and clear the screen
+    FOR yPixel = 0 TO 100
+        FOR xPixel = 0 TO 100
+            ' Copy the color of each pixel to the image array
+            img(xPixel, yPixel) = POINT(xPixel + 20, yPixel + 20)
+            ' Clear the pixel on the screen
+            PSET (xPixel + 20, yPixel + 20), 0
+        NEXT xPixel
+    NEXT yPixel
+    CLS
+END SUB
+
diff --git a/2D GFX/Animations/Polygon textured.webm b/2D GFX/Animations/Polygon textured.webm
new file mode 100644
index 0000000..41c764d
Binary files /dev/null and b/2D GFX/Animations/Polygon textured.webm differ
diff --git a/2D GFX/Animations/Polygon.bas b/2D GFX/Animations/Polygon.bas
new file mode 100755
index 0000000..203e399
--- /dev/null
+++ b/2D GFX/Animations/Polygon.bas	
@@ -0,0 +1,87 @@
+' Program to render polygons at random locations and random colors.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2001,    Initial version
+' 2024,    Improved program readability
+
+DEFINT A-Z
+DECLARE SUB fillPolygon (x1, y1, x2, y2, x3, y3, c)
+SCREEN 13
+
+MainLoop:
+    ' Generate random coordinates for the first vertex
+    x1 = RND * 318 + 1
+    y1 = RND * 198 + 1
+
+    ' Generate random coordinates for the second vertex
+    x2 = RND * 318 + 1
+    y2 = RND * 198 + 1
+
+    ' Generate random coordinates for the third vertex
+    x3 = RND * 318 + 1
+    y3 = RND * 198 + 1
+
+    ' Fill the polygon with a random color
+    fillPolygon x1, y1, x2, y2, x3, y3, RND * 255
+
+    ' Add delay
+    SOUND 0, 1
+
+    ' Check if any key is pressed to exit the loop
+    IF INKEY$ <> "" THEN SYSTEM
+GOTO MainLoop
+
+SUB fillPolygon (x1, y1, x2, y2, x3, y3, c)
+    ' Buffer array to store x-coordinates for each y-index
+    DIM yBuffer(-10 TO 210)
+
+    ' Draw the line between the first and second vertices
+    tempX1 = x1
+    tempY1 = y1
+    tempX2 = x2
+    tempY2 = y2
+    GOSUB makeLine
+
+    ' Draw the line between the first and third vertices
+    tempX1 = x1
+    tempY1 = y1
+    tempX2 = x3
+    tempY2 = y3
+    GOSUB makeLine
+
+    ' Draw the line between the second and third vertices
+    tempX1 = x3
+    tempY1 = y3
+    tempX2 = x2
+    tempY2 = y2
+    GOSUB makeLine
+
+GOTO FillEnd
+
+makeLine:
+    ' Ensure that the start point is always below the end point
+    IF tempY2 < tempY1 THEN SWAP tempY1, tempY2: SWAP tempX1, tempX2
+
+    ' Loop through each y-index from the start to the end
+    FOR yIndex = tempY1 TO tempY2 - 1
+        ' Calculate the x-position for the current y-index
+        xPos = tempX1 + (tempX2 - tempX1) * ((yIndex - tempY1) / (tempY2 - tempY1))
+
+        ' If the buffer is empty, store the x-position
+        IF yBuffer(yIndex) = 0 THEN
+            yBuffer(yIndex) = xPos
+        ELSE
+            ' Otherwise, draw a line between the stored and calculated positions
+            LINE (xPos, yIndex)-(yBuffer(yIndex), yIndex), c
+        END IF
+    NEXT yIndex
+RETURN
+
+FillEnd:
+END SUB
+
diff --git a/2D GFX/Animations/Polygon.webm b/2D GFX/Animations/Polygon.webm
new file mode 100644
index 0000000..31bf79f
Binary files /dev/null and b/2D GFX/Animations/Polygon.webm differ
diff --git a/2D GFX/Animations/Screensaver, flying hand fans.bas b/2D GFX/Animations/Screensaver, flying hand fans.bas
new file mode 100755
index 0000000..4478601
--- /dev/null
+++ b/2D GFX/Animations/Screensaver, flying hand fans.bas	
@@ -0,0 +1,64 @@
+' Screensaver
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.04, Initial version
+' 2024.08, Improved program readability
+
+
+SCREEN 7, , , 1
+
+' Main animation loop
+1 :
+    ' Adjust frame counter if it exceeds a certain threshold
+    IF frameCounter > 10000 THEN frameCounter = -10000
+
+    ' Update the positions of six points based on the frame counter
+    FOR pointIndex = 1 TO 6
+        OUT &H3C8, pointIndex
+        OUT &H3C9, SIN(pointIndex + frameCounter * 3) * 30 + 31
+        OUT &H3C9, COS(pointIndex * 1 + frameCounter * 5) * 30 + 31
+        OUT &H3C9, SIN(pointIndex * .7 + frameCounter * 2.23) * 30 + 31
+    NEXT pointIndex
+
+    ' Increment the frame counter for the next iteration
+    frameCounter = frameCounter + .01
+
+    ' Render lines connecting points
+    FOR objectIndex = 1 TO 10
+        ' Determine the color based on the remainder of objectIndex divided by 6
+        pointColor = (objectIndex MOD 6) + 1
+        ' Calculate the X coordinate for the starting point of the line
+        xCoordinate = SIN(objectIndex + frameCounter) * 100 + 150
+        ' Calculate the Y coordinate for the starting point of the line
+        yCoordinate = COS(objectIndex * 1.2 + frameCounter * 1.81) * 80 + 100
+        ' Calculate the sine component for the line's angle
+        xSineComponent = SIN(objectIndex * frameCounter * 2.3)
+        ' Draw lines from the starting point with varying lengths and angles
+        FOR xPositionOffset = -50 TO 50 STEP 10
+            ' Calculate the cosine component for the line's angle based on xPositionOffset
+            yCosineComponent = COS(xPositionOffset / 60 + frameCounter * 1 + objectIndex) * 50
+            ' Draw a line segment with varying thickness and color
+            LINE (xCoordinate, yCoordinate)-(xCoordinate + xPositionOffset * xSineComponent, yCoordinate - yCosineComponent), pointColor
+        NEXT xPositionOffset
+    NEXT objectIndex
+
+    ' Copy the graphics from the hidden page to the visible page
+    PCOPY 0, 1
+
+    ' Clear the screen for the next frame
+    CLS
+
+    ' Play a sound at a specific frequency and duration
+    SOUND 0, .4
+
+    ' Check if any key is pressed; if so, exit the program
+    IF INKEY$ <> "" THEN SYSTEM
+
+    ' Loop back to the start of the animation
+GOTO 1
+
diff --git a/2D GFX/Animations/Screensaver, flying hand fans.webm b/2D GFX/Animations/Screensaver, flying hand fans.webm
new file mode 100644
index 0000000..66769f7
Binary files /dev/null and b/2D GFX/Animations/Screensaver, flying hand fans.webm differ
diff --git a/2D GFX/Animations/Screensaver.bas b/2D GFX/Animations/Screensaver.bas
new file mode 100755
index 0000000..b867ff2
--- /dev/null
+++ b/2D GFX/Animations/Screensaver.bas	
@@ -0,0 +1,46 @@
+' Mystery screensaver
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2004.01, Initial version
+' 2024.08, Improved program readability
+
+SCREEN 7, , , 1
+
+' Main loop for animation
+DO
+    ' Increment frame counter
+    frameCounter = frameCounter + 1
+
+    ' Calculate scaling factor based on frame counter
+    scaleFactor = (SIN(frameCounter / 100) + 1.1) * 2
+
+    ' Draw lines to create animation effect
+    FOR s = 1 TO 20 STEP .1
+        ' Calculate x and y coordinates for the first point
+        x = SIN(s / 1 + frameCounter / 7) * 100
+        y = COS(s / 1 + frameCounter / 10) * 100
+
+        ' Calculate x and y coordinates for the second point
+        x1 = SIN(s / 1 - frameCounter / 8) * 100
+        y1 = COS(s / 1 + frameCounter / 15) * 100
+
+        ' Draw a line between the two points with varying thickness
+        LINE (x + 160, y + 100)-(x1 + 160, y1 + 100), s MOD 15
+    NEXT s
+
+    ' Copy screen buffer to display the animation
+    PCOPY 0, 1
+
+    ' Generate a sound effect
+    SOUND 0, 1
+
+    ' Clear the screen for the next frame
+    CLS
+
+    ' Check if a key is pressed and exit if so
+    IF INKEY$ <> "" THEN SYSTEM
+LOOP
diff --git a/2D GFX/Animations/Screensaver.webm b/2D GFX/Animations/Screensaver.webm
new file mode 100644
index 0000000..fd41592
Binary files /dev/null and b/2D GFX/Animations/Screensaver.webm differ
diff --git a/2D GFX/Animations/Snowfall.bas b/2D GFX/Animations/Snowfall.bas
new file mode 100755
index 0000000..528724e
--- /dev/null
+++ b/2D GFX/Animations/Snowfall.bas	
@@ -0,0 +1,96 @@
+' Svjatoslav Agejenko 2003.04
+
+DEFINT A-Z
+DECLARE SUB fall (particleIndex)
+DECLARE SUB start ()
+
+amo = 500
+
+DIM SHARED fx(1 TO amo)
+DIM SHARED fy(1 TO amo)
+
+' Initialize particle positions
+FOR a = 1 TO amo
+    fx(a) = RND * 300 + 10
+    fy(a) = RND * 100 + 10
+NEXT a
+
+start
+
+1
+' Main loop to simulate snowfall
+FOR b = 1 TO 100
+    a = INT(RND * amo) + 1
+    fall a
+NEXT b
+SOUND 0, .1
+IF INKEY$ <> "" THEN SYSTEM
+GOTO 1
+
+SUB fall (particleIndex)
+
+t = 0
+2
+' Draw the particle at its current position
+PSET (fx(particleIndex), fy(particleIndex)), 0
+
+ny = fy(particleIndex) + 1
+nx = fx(particleIndex) + INT(RND * 3) - 1
+
+' Check for collision with another particle
+IF POINT(nx, ny) > 0 THEN
+    ' If collision detected and t is less than 10, increment t and retry
+    IF t < 10 THEN
+        t = t + 1
+        GOTO 2
+    END IF
+    ' If collision persists, change particle color to indicate collision
+    PSET (fx(particleIndex), fy(particleIndex)), 15
+    nx = RND * 300 + 10
+    ny = 1
+END IF
+
+' Check if the particle has reached the bottom of the screen
+IF fy(particleIndex) > 198 THEN
+    PSET (fx(particleIndex), fy(particleIndex)), 15
+    nx = RND * 300 + 10
+    ny = 1
+END IF
+
+' Update particle position
+fx(particleIndex) = nx
+fy(particleIndex) = ny
+
+' Draw the particle at its new position
+PSET (fx(particleIndex), fy(particleIndex)), 15
+
+END SUB
+
+DEFSNG A-Z
+SUB start
+SCREEN 13
+
+' Create nice and curvy surface for snow particles to fall onto.
+' Here we draw "SNOW" with big and wobbly letters to the screen
+' to serve as an obstacle for snow particles.
+
+LOCATE 1, 1
+PRINT "SNOW"
+
+FOR y = 0 TO 15 STEP .2
+    xp = SIN(y / 1) * 3 + 65
+    FOR x = 0 TO 30 STEP .1
+        ys = 4 + COS(x / 5)
+        yp = COS(x / 4 + 3) * 5 + 130
+        c = POINT(x, y)
+        ' Draw a line if the point is not black
+        IF c > 0 THEN
+            LINE (x * 6 + xp, y * ys + yp)-(x * 6 + xp + 1, y * ys + yp + 1), 11, BF
+        END IF
+    NEXT x
+NEXT y
+
+LOCATE 1, 1
+PRINT "      "
+
+END SUB
diff --git a/2D GFX/Animations/Snowfall.webm b/2D GFX/Animations/Snowfall.webm
new file mode 100644
index 0000000..64ced88
Binary files /dev/null and b/2D GFX/Animations/Snowfall.webm differ
diff --git a/2D GFX/Animations/Tree.bas b/2D GFX/Animations/Tree.bas
new file mode 100755
index 0000000..15e78bb
--- /dev/null
+++ b/2D GFX/Animations/Tree.bas	
@@ -0,0 +1,116 @@
+DECLARE SUB setPalette ()
+' Render tree that starts with single root and then branches out.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001, Initial version
+' 2024.08, Improved program readability
+
+
+DECLARE SUB start ()
+DECLARE SUB show (d%)
+DECLARE SUB setpal ()
+DECLARE SUB showpal ()
+DEFINT A-Y
+
+DIM SHARED x(1 TO 500)
+DIM SHARED y(1 TO 500)
+DIM SHARED s(1 TO 500)
+
+DIM SHARED x4(1 TO 500)
+DIM SHARED y4(1 TO 500)
+
+DIM SHARED z(1 TO 500)
+DIM SHARED mitu
+
+
+start
+
+1
+mitu = 1
+
+x4(1) = -1
+y4(1) = -1
+x(1) = 420
+y(1) = 340
+s(1) = 70 * 100
+z(1) = 1
+
+' Main loop to render the tree branches
+FOR tr = 1 TO 6
+    FOR b = 1 TO 50
+        FOR a = 1 TO mitu
+            show a
+        NEXT a
+    NEXT b
+
+    ' Duplicate existing branches and add randomness
+    FOR a = 1 TO mitu
+        x(mitu + a) = x(a)
+        y(mitu + a) = y(a)
+        s(mitu + a) = s(a)
+        z(mitu + a) = z(a)
+        x4(mitu + a) = RND * 4 - 2
+        y4(mitu + a) = RND * 4 - 2
+    NEXT a
+    mitu = mitu * 2
+
+NEXT tr
+
+' Exit application if any key was pressed by user
+IF INKEY$ <> "" THEN SYSTEM
+
+
+SLEEP 2
+CLS
+GOTO 1
+
+SUB setPalette
+    ' Set the palette colors to grayscale
+    FOR a = 0 TO 16
+        OUT &H3C8, a
+        OUT &H3C9, a * 4
+        OUT &H3C9, a * 4
+        OUT &H3C9, a * 4
+    NEXT
+END SUB
+
+SUB show (d)
+    ' Retrieve current branch properties
+    x1 = x(d)
+    y1 = y(d)
+    s1 = s(d)
+    z1 = z(d)
+
+    ' Calculate color based on angle
+    c = SIN(z1) * 7 + 9
+
+    ' Draw and fill the circle representing the branch
+    CIRCLE (x1, y1), s1 / 100, c
+    PAINT (x1, y1), c
+
+    ' Update position based on current angle and size
+    x(d) = x(d) + (SIN(z1) * 1000) / (s1 + 15)
+    y(d) = y(d) + (COS(z1) * 1000) / (s1 + 15)
+
+    ' Decay the size slightly
+    s(d) = s(d) / 1.01
+
+    ' Update angle based on direction
+    IF x4(d) >= 0 THEN z(d) = z(d) + .1 ELSE z(d) = z(d) - .1
+
+    ' Move branch in its random direction
+    x(d) = x(d) + x4(d)
+    y(d) = y(d) + y4(d)
+END SUB
+
+SUB start
+    SCREEN 12
+    setPalette
+    RANDOMIZE TIMER
+END SUB
+
diff --git a/2D GFX/Animations/Tree.webm b/2D GFX/Animations/Tree.webm
new file mode 100644
index 0000000..a3d8b66
Binary files /dev/null and b/2D GFX/Animations/Tree.webm differ
diff --git a/2D GFX/Animations/Yin and yang.bas b/2D GFX/Animations/Yin and yang.bas
new file mode 100755
index 0000000..bca4394
--- /dev/null
+++ b/2D GFX/Animations/Yin and yang.bas	
@@ -0,0 +1,57 @@
+' Yin and yang animation.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2000, Initial version
+' 2024.08, Improved program readability
+
+DECLARE SUB Cir (x!, y!, r!, c!)
+SCREEN 13
+pi = 3.141592599999999#
+PAINT (1, 1), 1
+
+' Main animation loop
+DO
+    ' Calculate the x and y positions for both circles using sine and cosine functions
+    x = SIN(a) * 40 + 160
+    x1 = SIN(a + pi) * 40 + 160
+    y = COS(a) * 34 + 100
+    y1 = COS(a + pi) * 34 + 100
+
+    ' Draw the first circle with color 0 (black)
+    Cir x, y, 40, 0
+    ' Draw the second circle with color 1 (blue)
+    Cir x1, y1, 40, 1
+
+    ' Increment the angle to animate the circles
+    a = a + .05
+
+    ' Check for user input to exit the program
+    IF INKEY$ <> "" THEN SYSTEM
+
+    ' delay to slow down animation
+    SOUND 0, 1
+LOOP
+
+' Subroutine to draw a circle with specified center (x, y), radius r, and color c
+SUB Cir (x, y, r, c)
+    ' Define colors for the circle outline
+    cc1 = 0 ' Black
+    cc2 = 15 ' White
+
+    ' Swap colors if the second color is desired for the inner part of the circle
+    IF c = 1 THEN SWAP cc1, cc2
+
+    ' Draw the circle from radius 1 to r
+    FOR a = 1 TO r
+        ' Determine the color for the current circle segment
+        IF a < r / 2 THEN c1 = cc1 ELSE c1 = cc2
+        ' Draw the circle segment with the determined color
+        CIRCLE (x, y), a, c1
+    NEXT a
+END SUB
+
diff --git a/2D GFX/Animations/Yin and yang.webm b/2D GFX/Animations/Yin and yang.webm
new file mode 100644
index 0000000..9c78c91
Binary files /dev/null and b/2D GFX/Animations/Yin and yang.webm differ
diff --git a/2D GFX/Animations/circular patterns.bas b/2D GFX/Animations/circular patterns.bas
new file mode 100644
index 0000000..b68024e
--- /dev/null
+++ b/2D GFX/Animations/circular patterns.bas	
@@ -0,0 +1,58 @@
+' Program generates fractal animation that looks like atoms.
+' While it uses a simple formula to calculate the color of every pixel,
+' visual effect is quite impressive. Formula was accidentally discovered.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2002, Original version
+' 2024 - 2025, Improved program readability
+
+SCREEN 13
+DIM SHARED pixelByte AS STRING * 1
+
+zoomFactor = 100
+frameNumber = 0
+fileNameChar1 = 97
+fileNameChar2 = 97
+
+1
+frameNumber = frameNumber + 1
+
+' Calculate transformed screen dimensions based on current zoom level
+transformedScreenWidth = 320 * zoomFactor / 30
+transformedScreenHeight = 200 * zoomFactor / 30
+
+' Calculate starting coordinates to center the fractal pattern
+startCoordinateX = 160 - (transformedScreenWidth / 2)
+startCoordinateY = 100 - (transformedScreenHeight / 2)
+
+' CLS
+
+' Generate fractal pattern pixel by pixel
+FOR currentY = 0 TO 199
+    FOR currentX = 0 TO 319
+        ' Calculate new coordinates with current zoom level
+        newX = startCoordinateX + (transformedScreenWidth * currentX / 320)
+        newY = startCoordinateY + (transformedScreenHeight * currentY / 200)
+
+        ' Calculate color value using fractal formula
+        ' Formula: sin((x² + y²) / 10) * 6 + 23
+        colorValue = SIN((newX ^ 2 + newY ^ 2) / 10) * 6 + 23
+
+        ' Clamp color values to valid range (16-31)
+        IF colorValue < 16 THEN colorValue = 16
+        IF colorValue > 31 THEN colorValue = 31
+        PSET (currentX, currentY), colorValue
+    NEXT currentX
+NEXT currentY
+
+
+' Decrease zoom factor for next frame to create zooming effect
+zoomFactor = zoomFactor / 1.1
+
+' Continue generating frames while zoom factor is above minimum threshold
+IF zoomFactor > 5 THEN GOTO 1
diff --git a/2D GFX/Animations/circular patterns.webm b/2D GFX/Animations/circular patterns.webm
new file mode 100644
index 0000000..99243c8
Binary files /dev/null and b/2D GFX/Animations/circular patterns.webm differ
diff --git a/2D GFX/Animations/hacker.bas b/2D GFX/Animations/hacker.bas
new file mode 100755
index 0000000..48a2ddb
--- /dev/null
+++ b/2D GFX/Animations/hacker.bas	
@@ -0,0 +1,244 @@
+' Program to render animation inspired by Matrix movie.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.04, Initial version
+' 2024.08, Improved program readability
+
+
+DECLARE FUNCTION getCharacter% ()
+DECLARE SUB makeSound ()
+DEFINT A-Z
+DECLARE SUB displayScreen ()
+DECLARE SUB showPalette ()
+DECLARE SUB initializeGame ()
+
+DIM SHARED screenBuffer(1 TO 40, 1 TO 25) AS INTEGER
+DIM SHARED colorBuffer(1 TO 40, 1 TO 25) AS INTEGER
+DIM SHARED soundArray(1 TO 20)
+DIM SHARED soundPointer
+
+initializeGame
+'showPalette()
+
+' Initialize the screen buffer with random characters
+FOR row = 1 TO 25
+  FOR col = 1 TO 40
+    screenBuffer(col, row) = getCharacter
+  NEXT col
+NEXT row
+
+' Initialize the color buffer with a default color
+FOR row = 1 TO 25
+  FOR col = 1 TO 40
+    colorBuffer(col, row) = 1
+  NEXT col
+NEXT row
+
+actionCounter = 0
+
+10 ' Main game loop
+makeSound
+frameCounter = frameCounter + 1
+IF frameCounter > 10000 THEN frameCounter = 1
+
+' Shift the screen buffer contents down by one row
+FOR row = 25 TO 2 STEP -1
+  FOR col = 1 TO 40
+    screenBuffer(col, row) = screenBuffer(col, row - 1)
+  NEXT col
+NEXT row
+makeSound
+
+' Move the top row to the bottom
+FOR col = 1 TO 40
+  screenBuffer(col, 1) = screenBuffer(col, 25)
+NEXT col
+
+' Randomly change a character in the buffer
+screenBuffer(INT(RND * 39 + 1), INT(RND * 10 + 1)) = getCharacter
+actionCounter = actionCounter + 1
+displayScreen
+
+SELECT CASE actionCounter
+CASE 1
+  ' Initialize sound array with random values
+  FOR a = 1 TO 20
+    soundArray(a) = 0
+    IF RND * 100 < 2 THEN soundArray(a) = INT(RND * 4000 + 4000)
+  NEXT a
+  ' Set sound frequencies based on sine wave
+  b = SIN(frameCounter / 100) * 3 + 6
+  FOR a = 1 TO 20 STEP b
+    soundArray(a) = 10000
+  NEXT a
+
+CASE 2
+  ' Draw a horizontal line with random color
+  c = INT(RND * 5)
+  x1 = INT(RND * 38 + 1)
+  y = INT(RND * 23 + 1)
+  x2 = INT(RND * 38 + 1)
+  IF x1 > x2 THEN SWAP x1, x2
+  FOR x = x1 TO x2
+    colorBuffer(x, y) = c
+  NEXT x
+
+CASE 3
+  ' Draw a vertical line with random color
+  c = INT(RND * 5)
+  y1 = INT(RND * 23 + 1)
+  x = INT(RND * 38 + 1)
+  y2 = INT(RND * 23 + 1)
+  IF y1 > y2 THEN SWAP y1, y2
+  FOR y = y1 TO y2
+    colorBuffer(x, y) = c
+  NEXT y
+
+CASE 4
+  ' Decrease the intensity of colors on the screen
+  IF RND * 100 < 20 THEN
+    FOR y = 1 TO 25
+      FOR x = 1 TO 40
+        IF colorBuffer(x, y) > 1 THEN colorBuffer(x, y) = colorBuffer(x, y) - 1
+      NEXT x
+    NEXT y
+  END IF
+
+CASE 5
+  ' Reset every second row to default color
+  IF RND * 100 < 5 THEN
+    FOR y = 1 TO 25 STEP 2
+      FOR x = 1 TO 40
+        colorBuffer(x, y) = 1
+      NEXT x
+    NEXT y
+  END IF
+
+CASE 6
+  ' Reset every second column to default color
+  IF RND * 100 < 5 THEN
+    FOR x = 1 TO 40 STEP 2
+      FOR y = 1 TO 25
+        colorBuffer(x, y) = 1
+      NEXT y
+    NEXT x
+  END IF
+
+CASE 7
+  ' Randomly set some characters to random colors
+  FOR a = 1 TO 30
+    colorBuffer(INT(RND * 39 + 1), INT(RND * 23 + 1)) = INT(RND * 4 + 1)
+  NEXT a
+
+CASE 8
+  ' Check for user input to exit the game
+  IF INKEY$ <> "" THEN SYSTEM
+  actionCounter = 0
+END SELECT
+
+GOTO 10
+
+SYSTEM:
+' Exit the game
+END
+
+SUB displayScreen
+
+makeSound
+LOCATE 1, 1
+
+' Display the top half of the screen
+FOR y = 1 TO 10
+  FOR x = 1 TO 40
+    COLOR colorBuffer(x, y), 0
+    PRINT CHR$(screenBuffer(x, y));
+  NEXT x
+NEXT y
+
+makeSound
+' Display the middle part of the screen
+FOR y = 11 TO 20
+  FOR x = 1 TO 40
+    COLOR colorBuffer(x, y), 0
+    PRINT CHR$(screenBuffer(x, y));
+  NEXT x
+NEXT y
+
+makeSound
+' Display the bottom half of the screen
+FOR y = 21 TO 25
+  FOR x = 1 TO 40
+    COLOR colorBuffer(x, y), 0
+    PRINT CHR$(screenBuffer(x, y));
+  NEXT x
+NEXT y
+
+makeSound
+
+END SUB
+
+FUNCTION getCharacter
+' Generate a random character based on probability
+IF RND * 100 > 50 THEN
+  getCharacter = INT(RND * 9 + 48)
+ELSE
+  getCharacter = INT(RND * 25 + 65)
+END IF
+IF RND * 100 < 15 THEN getCharacter = 32 ' 15% chance to return a space
+END FUNCTION
+
+SUB initializeGame
+
+RANDOMIZE TIMER ' Seed the random number generator
+CLS ' Clear the screen
+WIDTH 40, 25 ' Set screen dimensions
+VIEW PRINT 1 TO 25 ' Set the print area
+
+' Initialize palette registers for color text mode
+OUT &H3C8, 0
+OUT &H3C9, 0
+OUT &H3C9, 0
+OUT &H3C9, 0
+
+' Set up color palettes
+FOR a = 1 TO 5
+  OUT &H3C8, a
+
+  b = a * 5
+  g = a * 10 + 20
+  r = a * 0
+
+  ' Ensure RGB values do not exceed the maximum value
+  IF r > 63 THEN r = 63
+  IF g > 63 THEN g = 63
+  IF b > 63 THEN b = 63
+  OUT &H3C9, r
+  OUT &H3C9, g
+  OUT &H3C9, b
+NEXT a
+
+END SUB
+
+SUB makeSound
+' Update the sound pointer and play a sound
+soundPointer = soundPointer + 1
+IF soundPointer > 20 THEN soundPointer = 1
+SOUND soundArray(soundPointer), .07
+' SOUND 0, .07 ' Uncomment to play a continuous tone
+END SUB
+
+SUB showPalette
+
+' Display a palette test on the screen
+FOR a = 0 TO 15
+  COLOR a
+  PRINT a; " Palette test"
+NEXT a
+a$ = INPUT$(1) ' Wait for user input
+
+END SUB
+
diff --git a/2D GFX/Animations/hacker.webm b/2D GFX/Animations/hacker.webm
new file mode 100644
index 0000000..553dc27
Binary files /dev/null and b/2D GFX/Animations/hacker.webm differ
diff --git a/2D GFX/Animations/index.org b/2D GFX/Animations/index.org
new file mode 100644
index 0000000..867f7ae
--- /dev/null
+++ b/2D GFX/Animations/index.org	
@@ -0,0 +1,272 @@
+#+TITLE: Graphics demos
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+#+begin_export html
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+#+end_export
+
+
+* Bump mapping
+
+Light source moves around. Based on light source location, different
+parts of the surface become illuminated.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="300" controls loop autoplay>
+    <source src="Bump mapping.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Bump mapping.bas][Source code]]
+
+* Tree
+
+Tree grows and branches out.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="Tree.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Tree.bas][Source code]]
+
+#+INCLUDE: "Tree.bas" src basic-qb45
+
+* Rotation in 2D space using trigonometry functions
+
+Grid of dots is rotated on the screen.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="2D rotation.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:2D rotation.bas][Source code]]
+
+#+INCLUDE: "2D rotation.bas" src basic-qb45
+
+* Various text mode animation effects
+
+Program demonstrates various animation effects that can be
+accomplished using text-mode rendering.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="text mode animation.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+  #+end_export
+
+[[file:text mode animation.bas][Source code]]
+
+* Snowfall
+
+Program simulates falling of snow particles. Particles fall towards
+the ground because of the gravity. Once particle falls on the surface,
+it tries to skid around a bit, bit ultimately freezes in-place.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="Snowfall.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Snowfall.bas][Source code]]
+
+#+INCLUDE: "Snowfall.bas" src basic-qb45
+
+* Screensaver
+
+Application of trigonometry functions is explored here to calculate
+line coordinates.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="Screensaver.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Screensaver.bas][Source code]]
+
+#+INCLUDE: "Screensaver.bas" src basic-qb45
+
+* Screensaver - flying hand fans
+
+Quick implementation for colorful flying hand fans.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="Screensaver, flying hand fans.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Screensaver, flying hand fans.bas][Source code]]
+
+#+INCLUDE: "Screensaver, flying hand fans.bas" src basic-qb45
+
+* Polygon rendering
+
+Algorithm to demonstrate rendering or polygons across arbitrary
+coordinates.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="Polygon.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Polygon.bas][Source code]]
+
+#+INCLUDE: "Polygon.bas" src basic-qb45
+
+* Textured polygon rendering
+
+Algorithm to demonstrate rendering or textured polygons across
+arbitrary coordinates.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="Polygon textured.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Polygon textured.bas][Source code]]
+
+* Yin and yang animation
+
+Yin and yang is a concept that originated in Chinese philosophy,
+describing an opposite but interconnected, self-perpetuating
+cycle. Yin and yang can be thought of as complementary and at the same
+time opposing forces that interact to form a dynamic system in which
+the whole is greater than the assembled parts and the parts are
+important for cohesion of the whole.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="Yin and yang.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Yin and yang.bas][Source code]]
+
+#+INCLUDE: "Yin and yang.bas" src basic-qb45
+
+* Orbiting particles
+
+Trivial to implement but interesting looking effect. Various particles
+are orbiting central point. Each particle is connected to the center.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="Orbiting particles.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Orbiting particles.bas][Source code]]
+
+#+INCLUDE: "Orbiting particles.bas" src basic-qb45
+
+* DNA animation
+
+Animated DNA. Nowhere close to being anatomically correct, but
+resembles animation as seen in the movies :)
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="DNA.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:DNA.bas][Source code]]
+
+#+INCLUDE: "DNA.bas" src basic-qb45
+
+* Matrix
+
+Effect inspired by "The Matrix" movie.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="matrix.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:matrix.bas][Source code]]
+
+* Hacker
+
+Ultra-realistic hacker screen simulator! Behold da glory of a true
+hacker's terminal, brimming wif mystical green text that cascades like
+a waterfall of knowledge across thy monitor.
+
+#+begin_export html
+<div class="flex-center">
+  <video width="1000" controls loop autoplay>
+    <source src="hacker.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:hacker.bas][Source code]]
diff --git a/2D GFX/Animations/logo.png b/2D GFX/Animations/logo.png
new file mode 100644
index 0000000..bda2751
Binary files /dev/null and b/2D GFX/Animations/logo.png differ
diff --git a/2D GFX/Animations/matrix.bas b/2D GFX/Animations/matrix.bas
new file mode 100755
index 0000000..e49784d
--- /dev/null
+++ b/2D GFX/Animations/matrix.bas	
@@ -0,0 +1,417 @@
+' Program renders animation/screensaver.
+' It is inspired by The Matrix movie.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2024 - 2025, Improved program readability
+
+
+DECLARE SUB initializeStream(streamIndex%)
+DECLARE SUB drawPixel(x%, y%)
+DECLARE SUB addNewPixel(x%, y%)
+DECLARE SUB smoothPixels(x1%, y1%, x2%, y2%, recursionDepth%)
+DECLARE SUB drawSymbol(x%, y%, symbol%)
+DECLARE SUB setColorPalette(paletteIndex%)
+DECLARE SUB initializeScreen()
+DECLARE SUB loadFonts()
+DEFINT A-Z
+
+' Arrays to store font data and pixel information
+DIM SHARED font1(1 TO 400, 1 TO 10)
+DIM SHARED font2(1 TO 400, 1 TO 10)
+DIM SHARED font3(1 TO 400, 1 TO 10)
+DIM SHARED pixelFont(0 TO 20, 0 TO 20)
+DIM SHARED pixelPalette(0 TO 20, 0 TO 20)
+DIM SHARED pixelAge(0 TO 20, 0 TO 20)
+DIM SHARED streamX(0 TO 20)
+DIM SHARED streamY(0 TO 20)
+DIM SHARED streamUsage(0 TO 20)
+DIM SHARED timerValue AS DOUBLE
+
+' Number of streams or objects in the animation
+numberOfStreams = 8
+
+' Initialize the screen and start the animation
+initializeScreen
+
+' Main loop of the program
+MainLoop:
+    FOR streamIndex = 1 TO numberOfStreams
+        ' Check if the usage count is zero
+        IF streamUsage(streamIndex) = 0 THEN initializeStream streamIndex
+        ' Add new position to the current object
+        addNewPixel streamX(streamIndex), streamY(streamIndex)
+        ' Update the y-coordinate of the current object
+        streamY(streamIndex) = streamY(streamIndex) + 1
+        ' Check if the y-coordinate exceeds the screen height
+        IF streamY(streamIndex) > 13 THEN streamY(streamIndex) = 0
+        ' Decrease the usage count of the current object
+        streamUsage(streamIndex) = streamUsage(streamIndex) - 1
+    NEXT streamIndex
+
+    ' Update the screen
+    FOR y = 0 TO 13
+        FOR x = 0 TO 18
+            ' Get the current pixel value
+            currentAge = pixelAge(x, y)
+            ' Increment the pixel value
+            currentAge = currentAge + 1
+            ' Check if the pixel value is equal to 2
+            IF currentAge = 2 THEN
+                pixelPalette(x, y) = 2
+                drawPixel x, y
+            ' Check if the pixel value is equal to 5
+            ELSEIF currentAge = 5 THEN
+                pixelPalette(x, y) = 3
+                drawPixel x, y
+            ' Check if the pixel value is equal to 30
+            ELSEIF currentAge = 30 THEN
+                pixelFont(x, y) = 0
+                drawPixel x, y
+            END IF
+            ' Update the pixel value
+            pixelAge(x, y) = currentAge
+        NEXT x
+    NEXT y
+
+    ' Wait for a short period of time
+    WaitLoop:
+    IF ABS(timerValue - TIMER) < .1 THEN GOTO WaitLoop
+    ' Update the timer
+    timerValue = TIMER
+    ' Check if any key is pressed
+    IF INKEY$ <> "" THEN SYSTEM
+    ' Go back to the main loop
+    GOTO MainLoop
+
+SUB addNewPixel(x, y)
+    ' Set a random font for the new pixel
+    pixelFont(x, y) = RND * 8 + 1
+    ' Set the palette index for the new pixel
+    pixelPalette(x, y) = 1
+    ' Initialize the pixel value
+    pixelAge(x, y) = 0
+    ' Draw the new pixel on the screen
+    drawPixel x, y
+END SUB
+
+SUB initializeStream(streamIndex)
+    ' Set random initial positions for the object
+    streamX(streamIndex) = RND * 18
+    streamY(streamIndex) = RND * 13
+    ' Set a random usage count for the object
+    streamUsage(streamIndex) = RND * 5 + 3
+END SUB
+
+SUB loadFonts
+    ' Load fonts from the screen
+    FOR symbolIndex = 1 TO 9
+        LOCATE 1, 1
+        ' Print the loading progress
+        PRINT "Loading: " + STR$(symbolIndex * 10) + "%"
+        ' Draw a square on the screen
+        LINE (49, 49)-(83, 83), 0, BF
+        ' Draw a symbol on the screen
+        drawSymbol 50, 50, symbolIndex
+        ' Smooth the symbol
+        smoothPixels 50, 50, 82, 82, 1
+        ' Get the smoothed symbol from the screen
+        GET (50, 50)-(82, 82), font1(1, symbolIndex)
+        ' Draw another square on the screen
+        LINE (49, 49)-(83, 83), 0, BF
+        ' Draw another symbol on the screen
+        drawSymbol 50, 50, symbolIndex
+        ' Smooth the other symbol
+        smoothPixels 50, 50, 82, 82, 2
+        ' Get the smoothed symbol from the screen
+        GET (50, 50)-(82, 82), font2(1, symbolIndex)
+        ' Draw yet another square on the screen
+        LINE (49, 49)-(83, 83), 0, BF
+        ' Draw yet another symbol on the screen
+        drawSymbol 50, 50, symbolIndex
+        ' Smooth the last symbol
+        smoothPixels 50, 50, 82, 82, 3
+        ' Get the smoothed symbol from the screen
+        GET (50, 50)-(82, 82), font3(1, symbolIndex)
+    NEXT symbolIndex
+    ' Clear the screen
+    CLS
+END SUB
+
+SUB drawPixel(x, y)
+    ' Calculate the screen coordinates for the pixel
+    x1 = x * 32 + 12
+    y1 = y * 32 + 15
+    ' Get the current font and palette index
+    currentFont = pixelFont(x, y)
+    currentPalette = pixelPalette(x, y)
+    ' Check if the pixel is empty
+    IF currentFont = 0 THEN
+        ' Draw an empty square on the screen
+        LINE (x1, y1)-(x1 + 32, y1 + 32), 0, BF
+    ELSE
+        ' Select the appropriate font based on the palette index
+        SELECT CASE currentPalette
+            CASE 1
+                ' Draw the pixel using the first font
+                PUT (x1, y1), font1(1, currentFont), PSET
+            CASE 2
+                ' Draw the pixel using the second font
+                PUT (x1, y1), font2(1, currentFont), PSET
+            CASE 3
+                ' Draw the pixel using the third font
+                PUT (x1, y1), font3(1, currentFont), PSET
+        END SELECT
+    END IF
+END SUB
+
+SUB drawSymbol(x, y, symbol)
+    ' Select the appropriate symbol based on the input value
+    SELECT CASE symbol
+        CASE 1
+            ' Draw the first symbol
+            LINE (x + 10, y + 5)-(x + 10, y + 20), 14
+            LINE (x + 5, y + 15)-(x + 20, y + 15), 14
+            LINE (x + 15, y + 25)-(x + 20, y + 25), 14
+            LINE (x + 20, y + 25)-(x + 25, y + 20), 14
+            LINE (x + 25, y + 20)-(x + 25, y + 5), 14
+        CASE 2
+            ' Draw the second symbol
+            LINE (x + 5, y + 15)-(x + 25, y + 10), 14
+            LINE (x + 15, y + 5)-(x + 10, y + 25), 14
+            LINE (x + 25, y + 5)-(x + 20, y + 20), 14
+            LINE (x + 20, y + 30)-(x + 30, y + 20), 14
+        CASE 3
+            ' Draw the third symbol
+            LINE (x + 5, y + 5)-(x + 5, y + 25), 14
+            LINE (x + 5, y + 5)-(x + 25, y + 25), 14
+            LINE (x + 5, y + 25)-(x + 25, y + 25), 14
+            LINE (x + 10, y + 10)-(x + 25, y + 5), 14
+        CASE 4
+            ' Draw the fourth symbol
+            LINE (x + 10, y + 5)-(x + 20, y + 5), 14
+            LINE (x + 20, y + 5)-(x + 25, y + 10), 14
+            LINE (x + 25, y + 20)-(x + 20, y + 25), 14
+            LINE (x + 20, y + 25)-(x + 10, y + 25), 14
+            LINE (x + 10, y + 25)-(x + 10, y + 5), 14
+            LINE (x + 5, y + 15)-(x + 20, y + 15), 14
+        CASE 5
+            ' Draw the fifth symbol
+            LINE (x + 5, y + 5)-(x + 10, y + 10), 14
+            LINE (x + 10, y + 10)-(x + 10, y + 25), 14
+            LINE (x + 10, y + 25)-(x + 5, y + 30), 14
+            LINE (x + 10, y + 25)-(x + 15, y + 30), 14
+            LINE (x + 15, y + 30)-(x + 25, y + 30), 14
+            LINE (x + 10, y + 20)-(x + 25, y + 20), 14
+        CASE 6
+            ' Draw the sixth symbol
+            LINE (x + 5, y + 5)-(x + 10, y + 5), 14
+            LINE (x + 5, y + 5)-(x + 5, y + 10), 14
+            LINE (x + 10, y + 10)-(x + 10, y + 15), 14
+            LINE (x + 10, y + 15)-(x + 20, y + 30), 14
+            LINE (x + 20, y + 30)-(x + 25, y + 30), 14
+            LINE (x + 5, y + 30)-(x + 10, y + 30), 14
+            LINE (x + 25, y + 15)-(x + 10, y + 30), 14
+        CASE 7
+            ' Draw the seventh symbol
+            LINE (x + 5, y + 15)-(x + 10, y + 15), 14
+            LINE (x + 10, y + 15)-(x + 25, y + 5), 14
+            LINE (x + 5, y + 25)-(x + 10, y + 25), 14
+            LINE (x + 10, y + 25)-(x + 15, y + 5), 14
+            LINE (x + 20, y + 5)-(x + 20, y + 20), 14
+            PSET (x + 15, y + 25), 14
+            PSET (x + 22, y + 25), 14
+        CASE 8
+            ' Draw the eighth symbol
+            LINE (x + 15, y + 10)-(x + 15, y + 25), 14
+            LINE (x + 20, y + 15)-(x + 20, y + 25), 14
+            LINE (x + 5, y + 20)-(x + 10, y + 25), 14
+            LINE (x + 10, y + 25)-(x + 25, y + 25), 14
+        CASE 9
+            ' Draw the ninth symbol
+            LINE (x + 5, y + 5)-(x + 25, y + 5), 14
+            LINE (x + 15, y + 5)-(x + 5, y + 20), 14
+            LINE (x + 15, y + 5)-(x + 25, y + 20), 14
+            LINE (x + 15, y + 5)-(x + 15, y + 25), 14
+            LINE (x + 5, y + 30)-(x + 20, y + 20), 14
+    END SELECT
+END SUB
+
+SUB setColorPalette(paletteIndex)
+    ' Set the color palette based on the input value
+    SELECT CASE paletteIndex
+        CASE 2
+            ' Set the colors for palette 2
+            FOR colorIndex = 0 TO 14
+                OUT &H3C8, colorIndex
+                OUT &H3C9, colorIndex * 2
+                OUT &H3C9, colorIndex * 4.5
+                OUT &H3C9, colorIndex * 3
+            NEXT colorIndex
+        CASE 1
+            ' Set the colors for palette 1
+            FOR colorIndex = 0 TO 14
+                OUT &H3C8, colorIndex
+                OUT &H3C9, 0
+                OUT &H3C9, 0
+                OUT &H3C9, 0
+            NEXT colorIndex
+            ' Set the color for the background
+            OUT &H3C8, 15
+            OUT &H3C9, 20
+            OUT &H3C9, 63
+            OUT &H3C9, 63
+    END SELECT
+END SUB
+
+SUB smoothPixels(x1, y1, x2, y2, recursionDepth)
+    ' Initialize the smoothing variable
+    smoothingValue = 0
+    ' Perform horizontal smoothing
+    FOR y = y1 TO y2
+        FOR x = x1 TO x2
+            ' Get the current pixel value
+            currentPixelValue = POINT(x, y)
+            ' Update the smoothing variable
+            smoothingValue = smoothingValue - 5
+            ' Ensure the smoothing variable is non-negative
+            IF smoothingValue < 0 THEN smoothingValue = 0
+            ' Update the smoothing variable if the current pixel value is greater
+            IF currentPixelValue > smoothingValue THEN smoothingValue = currentPixelValue
+            ' Set the smoothed pixel value
+            PSET (x, y), smoothingValue
+        NEXT x
+    NEXT y
+    ' Perform vertical smoothing
+    FOR x = x1 TO x2
+        smoothingValue = 0
+        FOR y = y1 TO y2
+            ' Get the current pixel value
+            currentPixelValue = POINT(x, y)
+            ' Update the smoothing variable
+            smoothingValue = smoothingValue - 5
+            ' Ensure the smoothing variable is non-negative
+            IF smoothingValue < 0 THEN smoothingValue = 0
+            ' Update the smoothing variable if the current pixel value is greater
+            IF currentPixelValue > smoothingValue THEN smoothingValue = currentPixelValue
+            ' Set the smoothed pixel value
+            PSET (x, y), smoothingValue
+        NEXT y
+    NEXT x
+    ' Perform diagonal smoothing
+    FOR y = y1 TO y2
+        smoothingValue = 0
+        FOR x = x1 TO x2
+            ' Get the current pixel value
+            currentPixelValue = POINT(x, y)
+            ' Update the smoothing variable
+            smoothingValue = smoothingValue - 5
+            ' Ensure the smoothing variable is non-negative
+            IF smoothingValue < 0 THEN smoothingValue = 0
+            ' Update the smoothing variable if the current pixel value is greater
+            IF currentPixelValue > smoothingValue THEN smoothingValue = currentPixelValue
+            ' Set the smoothed pixel value
+            PSET (x, y), smoothingValue
+        NEXT x
+    NEXT y
+    ' Perform diagonal smoothing in the opposite direction
+    FOR x = x1 TO x2
+        smoothingValue = 0
+        FOR y = y2 TO y1 STEP -1
+            ' Get the current pixel value
+            currentPixelValue = POINT(x, y)
+            ' Update the smoothing variable
+            smoothingValue = smoothingValue - 5
+            ' Ensure the smoothing variable is non-negative
+            IF smoothingValue < 0 THEN smoothingValue = 0
+            ' Update the smoothing variable if the current pixel value is greater
+            IF currentPixelValue > smoothingValue THEN smoothingValue = currentPixelValue
+            ' Set the smoothed pixel value
+            PSET (x, y), smoothingValue
+        NEXT y
+    NEXT x
+    ' Check if the recursion depth is equal to 1
+    IF recursionDepth = 1 THEN GOTO ExitSmoothing
+    ' Increment the recursion depth
+    newRecursionDepth = recursionDepth + 1
+    ' Perform horizontal smoothing with averaging
+    FOR y = y1 TO y2
+        smoothingValue = 0
+        FOR x = x1 TO x2
+            ' Get the current pixel value
+            currentPixelValue = POINT(x, y)
+            ' Update the smoothed pixel value using averaging
+            smoothingValue = (smoothingValue * recursionDepth + currentPixelValue) / newRecursionDepth
+            ' Ensure the smoothed pixel value is non-negative
+            finalSmoothingValue = smoothingValue - recursionDepth
+            IF finalSmoothingValue < 0 THEN finalSmoothingValue = 0
+            ' Set the final smoothed pixel value
+            PSET (x, y), finalSmoothingValue
+        NEXT x
+    NEXT y
+    ' Perform vertical smoothing with averaging
+    FOR x = x1 TO x2
+        smoothingValue = 0
+        FOR y = y1 TO y2
+            ' Get the current pixel value
+            currentPixelValue = POINT(x, y)
+            ' Update the smoothing variable
+            smoothingValue = smoothingValue - 5
+            ' Ensure the smoothing variable is non-negative
+            IF smoothingValue < 0 THEN smoothingValue = 0
+            ' Update the smoothing variable if the current pixel value is greater
+            IF currentPixelValue > smoothingValue THEN smoothingValue = currentPixelValue
+            ' Set the smoothed pixel value
+            PSET (x, y), smoothingValue
+        NEXT y
+    NEXT x
+    ' Perform diagonal smoothing with averaging
+    FOR y = y1 TO y2
+        smoothingValue = 0
+        FOR x = x2 TO x1 STEP -1
+            ' Get the current pixel value
+            currentPixelValue = POINT(x, y)
+            ' Update the smoothing variable
+            smoothingValue = smoothingValue - 5
+            ' Ensure the smoothing variable is non-negative
+            IF smoothingValue < 0 THEN smoothingValue = 0
+            ' Update the smoothing variable if the current pixel value is greater
+            IF currentPixelValue > smoothingValue THEN smoothingValue = currentPixelValue
+            ' Set the smoothed pixel value
+            PSET (x, y), smoothingValue
+        NEXT x
+    NEXT y
+    ' Perform diagonal smoothing in the opposite direction with averaging
+    FOR x = x1 TO x2
+        smoothingValue = 0
+        FOR y = y2 TO y1 STEP -1
+            ' Get the current pixel value
+            currentPixelValue = POINT(x, y)
+            ' Update the smoothing variable
+            smoothingValue = smoothingValue - 5
+            ' Ensure the smoothing variable is non-negative
+            IF smoothingValue < 0 THEN smoothingValue = 0
+            ' Update the smoothing variable if the current pixel value is greater
+            IF currentPixelValue > smoothingValue THEN smoothingValue = currentPixelValue
+            ' Set the smoothed pixel value
+            PSET (x, y), smoothingValue
+        NEXT y
+    NEXT x
+ExitSmoothing:
+END SUB
+
+SUB initializeScreen
+    ' Set the screen mode to 12
+    SCREEN 12
+    ' Set the color palette to 1
+    setColorPalette 1
+    ' Load the fonts
+    loadFonts
+    ' Set the color palette to 2
+    setColorPalette 2
+END SUB
diff --git a/2D GFX/Animations/matrix.webm b/2D GFX/Animations/matrix.webm
new file mode 100644
index 0000000..2b10e3f
Binary files /dev/null and b/2D GFX/Animations/matrix.webm differ
diff --git a/2D GFX/Animations/matrix2.bas b/2D GFX/Animations/matrix2.bas
new file mode 100755
index 0000000..5b1787d
--- /dev/null
+++ b/2D GFX/Animations/matrix2.bas	
@@ -0,0 +1,103 @@
+' Program to render animation inspired by opening scene from The Matrix movie.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2002, Initial version
+' 2024, Improved program readability
+
+DEFINT A-Z
+DECLARE SUB DisplayMatrix ()
+DIM SHARED matrixArray(1 TO 20)
+DIM SHARED lineLength
+DIM SHARED displayMessage$
+RANDOMIZE 2
+
+CLS
+COLOR 10, 0
+displayMessage$ = ""
+frameCounter = 0
+iterationCount = 0
+DisplayMatrix
+
+1 :   ' Label for looping
+
+' Creates high-pitch pulsing sound by toggling it on and off while iterating
+soundFrequency = 0
+IF iterationCount >= 3 THEN soundFrequency = 10000: iterationCount = 0
+SOUND soundFrequency, .2
+iterationCount = iterationCount + 1
+
+frameCounter = frameCounter + 1
+IF frameCounter > 100 THEN DisplayMatrix: frameCounter = 0
+
+displayLine$ = ""
+lineIndex = 1
+FOR column = 1 TO 80
+    lineIndex = lineIndex + 1
+    randomCharacter$ = CHR$(INT(RND * 9) + 48)
+    IF lineIndex > lineLength THEN lineIndex = 1: randomCharacter$ = " "
+    displayLine$ = displayLine$ + randomCharacter$
+NEXT column
+LOCATE 25, 1
+PRINT displayLine$
+IF INKEY$ <> "" THEN COLOR 7, 0: CLS : SYSTEM
+GOTO 1
+
+SUB DisplayMatrix
+    ' Set the viewport to print from line 1 to line 25
+    VIEW PRINT 1 TO 25
+
+    ' Display a message based on the code decoding progress
+    SELECT CASE lineLength
+        CASE 13
+            displayMessage$ = "Are you sure the line is clear?"
+        CASE 6
+            displayMessage$ = "       Then I'll go ..."
+    END SELECT
+
+    ' Clear and print the message at position (1, 30)
+    LOCATE 1, 30
+    PRINT "                                 "
+    LOCATE 1, 30
+    PRINT displayMessage$
+
+    randomValue = INT(RND * 9) + 1
+    FOR pass = 1 TO 3
+        FOR value = randomValue TO 10
+            IF matrixArray(value) = -1 THEN
+                ' Assign a random value between 1 and 8 to the array element
+                matrixArray(value) = INT(RND * 8) + 1
+                lineLength = lineLength - 1
+                GOTO 2
+            END IF
+        NEXT value
+        ' Reset randomValue if no valid position is found
+        randomValue = 1
+    NEXT pass
+
+    ' Reset the length and initialize the array
+    lineLength = 13
+    FOR index = 1 TO 20
+        matrixArray(index) = -1
+    NEXT index
+
+    CLS
+    IF displayMessage$ <> "" THEN SYSTEM
+
+2 :   ' Label for continuing after GOTO
+    FOR index = 1 TO 20
+        LOCATE 1, index
+        ' Display a space if the array element is -1, otherwise display the value
+        IF matrixArray(index) = -1 THEN displayChar$ = " " ELSE displayChar$ = STR$(matrixArray(index))
+        displayChar$ = RIGHT$(displayChar$, 1)
+        PRINT displayChar$
+    NEXT index
+
+    ' Set the viewport to print from line 2 to line 25
+    VIEW PRINT 2 TO 25
+END SUB
+
diff --git a/2D GFX/Animations/matrix2.webm b/2D GFX/Animations/matrix2.webm
new file mode 100644
index 0000000..fb8d08d
Binary files /dev/null and b/2D GFX/Animations/matrix2.webm differ
diff --git a/2D GFX/Animations/maze.BAS b/2D GFX/Animations/maze.BAS
new file mode 100755
index 0000000..b903011
--- /dev/null
+++ b/2D GFX/Animations/maze.BAS	
@@ -0,0 +1,144 @@
+' Render animated 3D maze.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2024 - 2025, Improved program readability
+
+DECLARE FUNCTION getWord& (memoryAddress!)
+DECLARE FUNCTION getByte! (memoryAddress!)
+DECLARE SUB displayIntroText ()
+DECLARE SUB handleUserInput ()
+DECLARE SUB writeByteToMemory (memoryAddress!, dataValue!)
+DECLARE SUB writeWordToMemory (memoryAddress!, dataValue!)
+DECLARE SUB initializeProgram ()
+DECLARE SUB renderMaze ()
+
+DIM SHARED pointX(1 TO 5000)
+DIM SHARED pointY(1 TO 5000)
+DIM SHARED pointZ(1 TO 5000)
+DIM SHARED rotatedPointX(1 TO 5000)
+DIM SHARED rotatedPointY(1 TO 5000)
+DIM SHARED rotatedPointE(1 TO 5000)
+DIM SHARED lineStartIndex(1 TO 5000)
+DIM SHARED lineEndIndex(1 TO 5000)
+DIM SHARED lineColor(1 TO 5000)
+DIM SHARED numberOfLines, numberOfPoints
+DIM SHARED angleXZ, angleYZ
+DIM SHARED externalSegment, externalAddress
+DIM SHARED viewerX, viewerY, viewerZ
+DIM SHARED buttonLeft, buttonRight
+DIM SHARED maxMovement
+
+numberOfLines = 0
+numberOfPoints = 0
+
+' Initialize the program and set up the screen
+initializeProgram
+
+' Initialize maze starting point
+mazeX = 0
+mazeY = 0
+mazeZ = 0
+numberOfPoints = 1
+pointX(1) = 0
+pointY(1) = 0
+pointZ(1) = 0
+
+' Main loop
+1
+frameCounter = frameCounter + 1
+viewerX = SIN(frameCounter / 30) * 100
+viewerZ = COS(frameCounter / 59) * 100
+viewerY = SIN(frameCounter / 300)
+angleXZ = SIN(frameCounter / 60)
+angleYZ = SIN(frameCounter / 36) / 3
+
+' Add a new point to the maze
+numberOfPoints = numberOfPoints + 1
+pointX(numberOfPoints) = mazeX
+pointY(numberOfPoints) = mazeY
+pointZ(numberOfPoints) = mazeZ
+
+' Add a new line to the maze
+numberOfLines = numberOfLines + 1
+lineStartIndex(numberOfLines) = numberOfPoints
+lineEndIndex(numberOfLines) = numberOfPoints - 1
+lineColor(numberOfLines) = INT(RND * 15) + 1
+
+' Pick random axis (dimension) where next segment of the maze should appear
+mazeGrowthDirection = INT(RND * 3)
+SELECT CASE mazeGrowthDirection
+    CASE 0
+        mazeX = RND * 500 - 250
+    CASE 1
+        mazeY = RND * 100 - 50
+    CASE 2
+        mazeZ = RND * 500 - 250
+END SELECT
+
+' Render the maze
+renderMaze
+
+' Copy and clear the screen
+PCOPY 0, 1
+CLS
+
+' Limit animation speed by making 0 Hz sound with fixed duration
+SOUND 0, 1
+
+' Exit condition
+IF frameCounter > 1200 THEN GOTO 200
+GOTO 1
+
+200
+
+SUB renderMaze
+    ' Calculate sine and cosine values for the rotation angles
+    sinAngleXZ = SIN(angleXZ)
+    sinAngleYZ = SIN(angleYZ)
+    cosAngleXZ = COS(angleXZ)
+    cosAngleYZ = COS(angleYZ)
+
+    ' Rotate and project points
+    FOR index = 1 TO numberOfPoints
+        x = pointX(index) - viewerX
+        y = pointY(index) - viewerY
+        z = pointZ(index) - viewerZ
+
+        ' First rotation around Y axis
+        rotatedXAfterFirstRotation = x * cosAngleXZ + z * sinAngleXZ
+        rotatedZAfterFirstRotation = z * cosAngleXZ - x * sinAngleXZ
+
+        ' Second rotation around X axis
+        rotatedYAfterSecondRotation = y * cosAngleYZ + rotatedZAfterFirstRotation * sinAngleYZ
+        rotatedZAfterSecondRotation = rotatedZAfterFirstRotation * cosAngleYZ - y * sinAngleYZ
+
+        ' Check if point is behind the viewer
+        IF rotatedZAfterSecondRotation > 3 THEN
+            rotatedPointE(index) = 1
+            rotatedPointX(index) = rotatedXAfterFirstRotation / rotatedZAfterSecondRotation * 130 + 160
+            rotatedPointY(index) = rotatedYAfterSecondRotation / rotatedZAfterSecondRotation * 130 + 100
+        ELSE
+            rotatedPointE(index) = 0
+        END IF
+    NEXT index
+
+    ' Draw lines between visible points
+    FOR index = 1 TO numberOfLines
+        lineStart = lineStartIndex(index)
+        lineEnd = lineEndIndex(index)
+        IF (rotatedPointE(lineStart) = 1) AND (rotatedPointE(lineEnd) = 1) THEN
+            LINE (rotatedPointX(lineStart), rotatedPointY(lineStart))-(rotatedPointX(lineEnd), rotatedPointY(lineEnd)), lineColor(index)
+        END IF
+    NEXT index
+END SUB
+
+SUB initializeProgram
+    ' Set the screen mode and initialize maximum movement value
+    SCREEN 7, , , 1
+    maxMovement = 50
+END SUB
diff --git a/2D GFX/Animations/maze.webm b/2D GFX/Animations/maze.webm
new file mode 100644
index 0000000..1e8e253
Binary files /dev/null and b/2D GFX/Animations/maze.webm differ
diff --git a/2D GFX/Animations/programming is fun.BAS b/2D GFX/Animations/programming is fun.BAS
new file mode 100755
index 0000000..4ef4268
--- /dev/null
+++ b/2D GFX/Animations/programming is fun.BAS	
@@ -0,0 +1,48 @@
+SCREEN 7, , , 1
+
+1
+FOR a = 1 TO SIN(frame / 30) * 3 + 4
+    LOCATE a * 2, a * 4
+    COLOR RND * 5 + 10
+    PRINT "Programming is fun!"
+NEXT a
+
+' Update frame and calculate new values for x, y and step size.
+frame = frame + 1
+stepSize = (SIN(frame / 10) + 2) / 3
+xPos = SIN(frame / 30) * 50
+yPos = COS(frame / 42) * 30
+
+' Draw circles with varying arc sizes.
+FOR a = .1 TO 10 STEP stepSize
+    CIRCLE (160 + xPos, 100 + yPos), 80, 2, , , a
+NEXT a
+
+' Generate random color value for lines.
+randomColor = RND * 2 + 12
+FOR a = 0 TO 10
+    f1 = (a + frame) / 12
+    f2 = (a + frame) / 7
+    x1 = SIN(f1) * 50
+    y1 = COS(f1) * 30
+    x2 = SIN(f2 + 6) * 50
+    y2 = COS(f2 + 6) * 30
+    ' Draw line between calculated points.
+    LINE (x1 + 180, y1 + 150)-(x2 + 180, y2 + 150), randomColor
+NEXT a
+
+' Draw random pixels on the screen. Like colorful stars in the night sky.
+FOR a = 0 TO 50
+    xRand = RND * 320
+    yRand = RND * 320
+    PSET (xRand, yRand), RND * 15
+NEXT a
+
+' Copy the current screen to the next page and clear the current screen.
+PCOPY 0, 1
+CLS
+
+' Check if frame count has exceeded the limit; if so, chain to another program.
+IF INKEY$ <> "" THEN SYSTEM
+GOTO 1
+
diff --git a/2D GFX/Animations/programming is fun.webm b/2D GFX/Animations/programming is fun.webm
new file mode 100644
index 0000000..1da56eb
Binary files /dev/null and b/2D GFX/Animations/programming is fun.webm differ
diff --git a/2D GFX/Animations/sun&eart.bas b/2D GFX/Animations/sun&eart.bas
new file mode 100755
index 0000000..8e5dc0f
--- /dev/null
+++ b/2D GFX/Animations/sun&eart.bas	
@@ -0,0 +1,96 @@
+' Projects animation of the sun, earth and moon.
+' The moon orbits the earth, and the earth orbits the sun.
+' The program uses clever trickery to determine
+' the drawing order of the objects based on their y-coordinates.
+
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 1999, Initial version
+' 2024, Improved program readability
+
+
+DECLARE SUB drawEarthMoonSystem (a2!, b2!, c2!)
+
+DIM SHARED moonX
+DIM SHARED moonY
+SCREEN 7, , , 1
+
+' Initialize the earth rotation angle
+earthRotationAngle = 0
+
+' Main loop to update and draw the objects
+1 : 
+    ' Increment the earthRotationAngle for every frame
+    earthRotationAngle = earthRotationAngle + .01
+
+    ' Calculate the x and y coordinates of the earth
+    earthX = SIN(earthRotationAngle) * 100 + 100
+    earthY = COS(earthRotationAngle) * 30 + 100
+
+    ' Because we dont do proper earth, moon and sun Z-sorting,
+    ' instead we implement clever trickery to determine, should
+    ' sun be drawn before earth-moon system, or after.
+    IF earthY >= 100 THEN
+        ' Draw the sun
+        CIRCLE (100, 100), 50, 12
+        PAINT (100, 100), 12
+    END IF
+
+    ' Call the subroutine to draw the earth-moon system
+    drawEarthMoonSystem earthX, earthY, (earthY - 70) / 2 + 2
+
+    IF earthY < 100 THEN
+        ' Draw the sun
+        CIRCLE (100, 100), 50, 12
+        PAINT (100, 100), 12
+    END IF
+
+    ' Copy the screen to buffer
+    PCOPY 0, 1
+
+    ' Clear the screen
+    CLS
+
+    ' Check if a key is pressed
+    IF INKEY$ = "" THEN GOTO 1
+
+' End the program
+SYSTEM
+
+SUB drawEarthMoonSystem (a2, b2, c2)
+    moonSize = (b2 - 70) / 2 + 2
+
+    ' Increment the moon's x and y coordinates
+    moonX = moonX + .1
+    moonY = moonY + .01
+
+    ' Calculate the x and y offsets for the moon
+    moonOffsetX = SIN(moonX) * moonSize * 2
+    moonOffsetY = COS(moonX) * 10
+
+    ' Because we don't do proper earth and moon Z-sorting,
+    ' instead we implement clever trickery to determine, should
+    ' earth be drawn before moon or after.
+    IF moonOffsetY > 0 THEN
+        ' Draw the earth
+        CIRCLE (a2, b2), c2, 1
+        PAINT (a2, b2), 1
+    END IF
+
+    ' Calculate the x and y coordinates of the moon and draw it
+    moonXCoord = moonOffsetX + a2
+    moonYCoord = moonOffsetY + b2
+    CIRCLE (moonXCoord, moonYCoord), ((moonOffsetY + 20) * moonSize) \ 50, 14
+    PAINT (moonXCoord, moonYCoord), 14
+
+    IF moonOffsetY <= 0 THEN
+        ' Draw the earth
+        CIRCLE (a2, b2), c2, 1
+        PAINT (a2, b2), 1
+    END IF
+END SUB
+
diff --git a/2D GFX/Animations/text mode animation.bas b/2D GFX/Animations/text mode animation.bas
new file mode 100755
index 0000000..6f8206e
--- /dev/null
+++ b/2D GFX/Animations/text mode animation.bas	
@@ -0,0 +1,202 @@
+' Program to render fancy looking text mode animations.
+' Various effects are overlaid on top of each other
+' while program scrolls it's own source code in the background.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.10, Initial version
+' 2024, Improved program readability
+
+DECLARE SUB displayScreen ()
+DECLARE SUB drawCircle ()
+DECLARE SUB drawLines ()
+DECLARE SUB fillBuffer ()
+DECLARE SUB updateDisplay ()
+DIM SHARED pi
+DIM SHARED angle
+DIM SHARED frameCounter
+DIM SHARED buffer2(1 TO 50, 1 TO 80) AS STRING * 1
+DIM SHARED buffer(1 TO 50, 1 TO 80) AS STRING * 1
+DIM SHARED colors(1 TO 50, 1 TO 80) AS INTEGER
+
+DIM SHARED verticalLinePosition, horizontalLinePosition
+DIM SHARED verticalLineSpeed, horizontalLineSpeed
+
+WIDTH 80, 50
+VIEW PRINT 1 TO 50
+pi = 3.14159
+OPEN "mkcircle.bas" FOR INPUT AS #1
+
+CLS
+
+horizontalLinePosition = 20
+horizontalLineSpeed = 1
+verticalLinePosition = 20
+verticalLineSpeed = 1
+
+1
+frameCounter = frameCounter + 1
+
+displayScreen
+fillBuffer
+drawLines
+drawCircle
+updateDisplay
+IF INKEY$ <> "" THEN GOTO 2
+GOTO 1
+2
+CLOSE #1
+SYSTEM
+
+SUB updateDisplay
+' This subroutine updates the display with the contents of the buffer
+COLOR 7, 0
+LOCATE 1, 1
+FOR y = 1 TO 50
+  FOR x = 1 TO 80
+    COLOR colors(y, x)
+    PRINT buffer(y, x);
+    ' Swap the contents of buffer and buffer2
+    buffer(y, x) = buffer2(y, x)
+    colors(y, x) = 4
+  NEXT x
+NEXT y
+
+END SUB
+
+SUB fillBuffer
+' This subroutine fills the buffer with a pattern
+COLOR 4, 0
+sizeMultiplier = SIN(frameCounter / 7) + 1.1
+
+angle = angle + SIN(frameCounter / 30) / 10
+radiusXPosition = 50 - SIN(angle + pi / 4) * 12 * 20 * sizeMultiplier
+radiusYPosition = 50 - COS(angle + pi / 4) * 12 * 20 * sizeMultiplier
+
+stepXPosition = SIN(angle) * 6 * sizeMultiplier
+stepYPosition = COS(angle) * 6 * sizeMultiplier
+radiusStepXPosition = SIN(angle + pi / 2) * 6 * sizeMultiplier
+radiusStepYPosition = COS(angle + pi / 2) * 6 * sizeMultiplier
+
+FOR y = 1 TO 50
+  radiusXPosition = radiusXPosition + radiusStepXPosition
+  radiusYPosition = radiusYPosition + radiusStepYPosition
+
+4
+IF radiusXPosition > 100 THEN radiusXPosition = radiusXPosition - 100: GOTO 4
+IF radiusXPosition < 0 THEN radiusXPosition = radiusXPosition + 100: GOTO 4
+IF radiusYPosition > 100 THEN radiusYPosition = radiusYPosition - 100: GOTO 4
+IF radiusYPosition < 0 THEN radiusYPosition = radiusYPosition + 100: GOTO 4
+
+currentXPosition = radiusXPosition
+currentYPosition = radiusYPosition
+
+FOR x = 1 TO 80
+  characterCode = 0
+  currentXPosition = currentXPosition + stepXPosition
+  currentYPosition = currentYPosition + stepYPosition
+
+3
+IF currentXPosition > 100 THEN currentXPosition = currentXPosition - 100: GOTO 3
+IF currentXPosition < 0 THEN currentXPosition = currentXPosition + 100: GOTO 3
+IF currentYPosition > 100 THEN currentYPosition = currentYPosition - 100: GOTO 3
+IF currentYPosition < 0 THEN currentYPosition = currentYPosition + 100: GOTO 3
+
+IF currentXPosition < 12 OR currentYPosition < 12 THEN buffer(y, x) = "*": colors(y, x) = 9
+NEXT x
+NEXT y
+END SUB
+
+SUB drawCircle
+' This subroutine draws a circle on the screen
+circleSize = (SIN(frameCounter / 10) + 1.01) * 30
+circleYPosition = SIN(frameCounter / 12) * 30 + 40
+circleXPosition = COS(frameCounter / 17) * 15 + 25
+
+FOR y = 1 TO 50
+  xPositionOffset = SIN(y / 5 + frameCounter / 30) * circleSize / 10
+
+IF (y >= circleYPosition - circleSize) AND (y <= circleYPosition + circleSize) THEN
+
+halfHeight1 = SQR((y - (circleYPosition - circleSize)) * ((circleYPosition + circleSize) - y))
+IF (y >= circleYPosition - circleSize / 2) AND (y <= circleYPosition + circleSize / 2) THEN halfHeight2 = SQR((y - (circleYPosition - circleSize / 2)) * ((circleYPosition + circleSize / 2) - y)) ELSE halfHeight2 = 0
+
+startXPosition = circleXPosition - halfHeight1 + xPositionOffset
+IF startXPosition < 1 THEN startXPosition = 1
+endXPosition = circleXPosition - halfHeight2 + xPositionOffset
+IF endXPosition > 80 THEN endXPosition = 80
+
+FOR x = startXPosition TO endXPosition
+  buffer(y, x) = CHR$(RND * 40 + 48)
+  colors(y, x) = RND * 15
+NEXT x
+
+startXPosition = circleXPosition + halfHeight2 + xPositionOffset
+IF startXPosition < 1 THEN startXPosition = 1
+endXPosition = circleXPosition + halfHeight1 + xPositionOffset
+IF endXPosition > 80 THEN endXPosition = 80
+
+FOR x = startXPosition TO endXPosition
+  buffer(y, x) = CHR$(RND * 200 + 32)
+  colors(y, x) = RND * 15
+NEXT x
+
+END IF
+
+NEXT y
+
+END SUB
+
+SUB drawLines
+' This subroutine draws vertical and horizontal lines on the screen
+verticalLinePosition = verticalLinePosition + verticalLineSpeed
+IF verticalLinePosition > 49 THEN verticalLineSpeed = -1
+IF verticalLinePosition < 2 THEN verticalLineSpeed = 1
+
+horizontalLinePosition = horizontalLinePosition + horizontalLineSpeed
+IF horizontalLinePosition > 79 THEN horizontalLineSpeed = -1
+IF horizontalLinePosition < 2 THEN horizontalLineSpeed = 1
+
+FOR x = 1 TO 80
+  IF buffer(verticalLinePosition, x) = "*" THEN characterCode = 31 ELSE characterCode = 10
+  buffer(verticalLinePosition, x) = "#"
+  colors(verticalLinePosition, x) = characterCode
+NEXT x
+
+FOR y = 1 TO 50
+  IF buffer(y, horizontalLinePosition) = "*" THEN characterCode = 31 ELSE characterCode = 10
+  buffer(y, horizontalLinePosition) = "#"
+  colors(y, horizontalLinePosition) = characterCode
+NEXT y
+END SUB
+
+SUB displayScreen
+' This subroutine displays the text from a file on the screen
+IF EOF(1) <> 0 THEN
+  CLOSE 1
+  OPEN "mkcircle.bas" FOR INPUT AS #1
+END IF
+
+LINE INPUT #1, lineText$
+
+FOR y = 1 TO 49
+FOR x = 1 TO 80
+  buffer2(y, x) = buffer2(y + 1, x)
+NEXT x
+NEXT y
+
+FOR x = 1 TO 80
+  buffer2(50, x) = " "
+NEXT x
+
+IF LEN(lineText$) > 80 THEN lineText$ = LEFT$(lineText$, 80)
+FOR b = 1 TO LEN(lineText$)
+  character$ = RIGHT$(LEFT$(lineText$, b), 1)
+  buffer2(50, b) = character$
+NEXT b
+
+END SUB
diff --git a/2D GFX/Animations/text mode animation.webm b/2D GFX/Animations/text mode animation.webm
new file mode 100644
index 0000000..0dc2a21
Binary files /dev/null and b/2D GFX/Animations/text mode animation.webm differ
diff --git a/2D GFX/Animations/txtpal.bas b/2D GFX/Animations/txtpal.bas
new file mode 100755
index 0000000..21f1ae8
--- /dev/null
+++ b/2D GFX/Animations/txtpal.bas	
@@ -0,0 +1,102 @@
+' This application produces beautiful colorful horizontal rainbows on the screen in text mode.
+' It works only on CRT monitors, because it accomplishes the effect by changing the color palette
+' while the CRT monitor is drawing the screen. As a result, unlimited number of colors can be
+' displayed on the screen simultaneously, regardless of the video card's color depth.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2003.01, Initial version
+' 2024, Improved program readability
+
+DEFINT A-Z
+CLS
+COLOR 7
+
+' Fill background with random colored random numbers.
+FOR b = 1 TO 500
+    COLOR RND * 15
+    PRINT RND;
+NEXT b
+
+' Set the background and text colors
+COLOR 0, 1
+
+' Clear rectangular area
+FOR y = 5 TO 20
+    FOR x = 20 TO 50
+        LOCATE y, x
+        PRINT " "
+    NEXT x
+NEXT y
+
+' Print "[ TEST ]" at position (10, 25)
+LOCATE 10, 25
+PRINT "[ TEST ]"
+
+' Print "[ TEST ]" in color 2 at position (15, 37)
+LOCATE 15, 37
+COLOR 2
+PRINT "[ TEST ]"
+
+' Initialize variables
+wa = 1
+p = &H3DA
+
+' Loop to wait until CRT monitor has drawn single frame
+1
+' measure how much time was spent waiting for screen redraw to complete
+w = w + 1
+
+' Check if monitor is still drawing frame
+a = INP(p)
+IF a >= 128 THEN a = a - 128
+IF a >= 64 THEN a = a - 64
+IF a >= 32 THEN a = a - 32
+IF a >= 16 THEN a = a - 16
+IF a < 8 THEN GOTO 1
+
+frm = frm + 1
+IF frm > 10000 THEN frm = -10000
+
+' Adjust the color palette change speed so that it takes approximately all of the time
+' when Ray is actually moving along screen surface and is drawing pixels.
+' So if we had to wait too long for drawing to complete at the end, it means
+' next frame we can be slower with our palette updates.
+IF w > 300 THEN wa = wa + 1 ELSE wa = wa - 1
+IF w < 250 THEN wa = wa - 5
+IF w > 3000 THEN wa = wa + 30
+IF w > 1000 THEN wa = wa + 5
+
+' Check if a key has been pressed
+IF INKEY$ <> "" THEN
+    ' Reset color palette
+    OUT &H3C8, 0
+    OUT &H3C9, 0
+    OUT &H3C9, 0
+    OUT &H3C9, 0
+    ' exit application
+    SYSTEM
+END IF
+
+' Alter video graphics color palette while CRT screen in drawing scanlines simultaneously
+FOR a = 0 TO 70
+
+    b = a * 6 + frm
+
+    ' Alter palette within video card
+    OUT &H3C8, 0
+    OUT &H3C9, SIN(b / 20) * 30 + 30
+    OUT &H3C9, SIN(b / 27) * 30 + 30
+    OUT &H3C9, SIN(b / 31) * 30 + 30
+
+    ' Delay to give time for CRT screen to complete horizontal scanlines
+    FOR u = 1 TO wa
+    NEXT u
+NEXT a
+
+w = 0
+GOTO 1
diff --git a/2D GFX/Fractals/fractal circles animated.bas b/2D GFX/Fractals/fractal circles animated.bas
new file mode 100755
index 0000000..56a48a0
--- /dev/null
+++ b/2D GFX/Fractals/fractal circles animated.bas	
@@ -0,0 +1,442 @@
+DECLARE SUB playSoundEffect (soundEffect$)
+DECLARE SUB initializeGraphics ()
+DECLARE SUB drawEllipse (xCoord!, yCoord!, size!, colorValue!, aspectRatio!)
+DECLARE SUB printMessage (xCoord!, yCoord!, message$, size!, colr!)
+DECLARE SUB addTimerElement (elementIndex!, time!, value!)
+DECLARE SUB initializeTimers ()
+DECLARE SUB processTimers ()
+DECLARE SUB drawFractal (xCoord!, yCoord!, angle!, size!, direction!)
+
+' Program that renders animation that contains fractal composed from circles.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+
+' Shared variables for global state
+DIM SHARED recursionDepth
+DIM SHARED pi
+
+' Variables to store shapes and timers
+DIM SHARED shapeSize1, shapeSize2, sizeValue1, sizeValue2, horizontalPosition, verticalPosition
+DIM SHARED timerTime(0 TO 50, 0 TO 100)
+DIM SHARED timerValue(0 TO 50, 0 TO 100)
+
+' Variables to store current timer states
+DIM SHARED timerCurrentPlace(0 TO 50)
+DIM SHARED timerCurrentTime(0 TO 50)
+DIM SHARED timerCurrentValue(0 TO 50)
+DIM SHARED timerLastFrameTime
+
+' Initialize pi with a constant value
+pi = 3.14128
+
+' Turn on the screen and initialize timers
+initializeGraphics
+
+' Set up graphics mode
+SCREEN 7, , , 1
+
+' Initialize the timer system
+initializeTimers
+
+' Main loop variable
+frameSize = 50
+
+' Main loop label
+MainLoop:
+    ' Calculate sine and cosine values for animation
+    sinValue = SIN(timerCurrentValue(1) * 1.3) * .5 + 1.1
+    cosValue = COS(timerCurrentValue(1) * 1.3) * .5 + 1.1
+
+    ' Increment frame counter
+    frameCounter = frameCounter + 1
+
+    ' Calculate shape sizes and positions
+    sizeValue1 = 5 * sinValue
+    sizeValue2 = 2
+    verticalPosition = SIN(timerCurrentValue(1) * 1.3)
+    shapeSize1 = 2 * cosValue
+    shapeSize2 = 1.4
+    horizontalPosition = SIN(timerCurrentValue(1)) * .7
+
+    ' Draw the main fractal object
+    drawFractal timerCurrentValue(2), timerCurrentValue(3), timerCurrentValue(4), timerCurrentValue(0), 0
+
+    ' Draw ellipses
+    drawEllipse 100, timerCurrentValue(6), timerCurrentValue(7) + 4, 14, .5
+    drawEllipse 100, timerCurrentValue(6), timerCurrentValue(7) + 2, 10, .5
+    drawEllipse 100, timerCurrentValue(6), timerCurrentValue(7), 0, .5
+
+    ' Print messages
+    printMessage timerCurrentValue(5), 10, "KHK", 7, 250
+    printMessage timerCurrentValue(8), 130, "Infotehno-", 2, 0
+    printMessage timerCurrentValue(8), 150, "   loogia", 2, 0
+
+    ' Process the timers
+    processTimers
+    LOCATE 1, 1
+
+    ' Check if the main loop should exit
+    IF timerCurrentTime(0) > 26 THEN SYSTEM
+
+    ' Make off-screen buffer visible
+    PCOPY 0, 1
+
+    ' Clear off-screen buffer with white background color in preparation to draw new frame
+    LINE (0, 0)-(319, 199), 15, BF
+
+    ' Go back to the main loop
+    GOTO MainLoop
+
+' Subroutine to draw an ellipse
+SUB drawEllipse (xCoord!, yCoord!, size!, colorValue!, aspectRatio!)
+    ' Draw an ellipse if xCoord and yCoord are positive
+    IF xCoord > 0 THEN
+        IF yCoord > 0 THEN
+            CIRCLE (xCoord, yCoord), size, colorValue, , , aspectRatio
+            PAINT (xCoord, yCoord), colorValue
+        END IF
+    END IF
+END SUB
+
+' Subroutine to draw animated fractal
+SUB drawFractal (xCoord!, yCoord!, angle!, size!, direction!)
+    ' Variables:
+    ' direction - indicates fractal branch direction
+    ' size - fractal fragment current size
+    ' angle - fractal twist angle
+    ' xCoord and yCoord - fractal fragment current position
+
+    ' Increment fragment depth counter
+    recursionDepth = recursionDepth + 1
+
+    ' If size is less than .2, skip drawing
+    IF size < .2 THEN GOTO SkipDrawing
+
+    ' Determine color based on depth
+    IF recursionDepth / 2 = recursionDepth \ 2 THEN
+        colr = 1
+    ELSE
+        colr = 3
+    END IF
+
+    ' Draw the circle and fill it with the determined color
+    CIRCLE (xCoord, yCoord), size, colr
+    PAINT (xCoord, yCoord), colr
+
+    ' Recursively draw child objects of the fractal if direction is not equal to 1
+    IF direction <> 1 THEN
+        x1 = SIN(angle) * size * 2.5 + xCoord
+        y1 = COS(angle) * size * 2.5 + yCoord
+        ' Change size based on the value of direction
+        IF direction = 3 THEN
+            newSize = size / sizeValue2
+        ELSE
+            newSize = size / sizeValue1
+        END IF
+        drawFractal x1, y1, angle + verticalPosition, newSize, 3
+    END IF
+
+    ' Recursively draw child objects if direction is not equal to 2
+    IF direction <> 2 THEN
+        x1 = SIN(angle - pi / 2) * size * 2.5 + xCoord
+        y1 = COS(angle - pi / 2) * size * 2.5 + yCoord
+        ' Change size based on the value of direction
+        IF direction = 4 THEN
+            newSize = size / shapeSize2
+        ELSE
+            newSize = size / shapeSize1
+        END IF
+        drawFractal x1, y1, angle + horizontalPosition, newSize, 4
+    END IF
+
+    ' Recursively draw child objects if direction is not equal to 3
+    IF direction <> 3 THEN
+        x1 = SIN(angle - pi) * size * 2.5 + xCoord
+        y1 = COS(angle - pi) * size * 2.5 + yCoord
+        ' Change size based on the value of direction
+        IF direction = 1 THEN
+            newSize = size / sizeValue2
+        ELSE
+            newSize = size / sizeValue1
+        END IF
+        drawFractal x1, y1, angle + verticalPosition, newSize, 1
+    END IF
+
+    ' Recursively draw child objects if direction is not equal to 4
+    IF direction <> 4 THEN
+        x1 = SIN(angle - pi * 1.5) * size * 2.5 + xCoord
+        y1 = COS(angle - pi * 1.5) * size * 2.5 + yCoord
+        ' Change size based on the value of direction
+        IF direction = 2 THEN
+            newSize = size / shapeSize2
+        ELSE
+            newSize = size / shapeSize1
+        END IF
+        drawFractal x1, y1, angle + horizontalPosition, newSize, 2
+    END IF
+
+SkipDrawing:
+    ' Decrement depth counter
+    recursionDepth = recursionDepth - 1
+END SUB
+
+' Subroutine to print a message on the screen
+SUB printMessage (xCoord!, yCoord!, message$, size!, colr!)
+    ' Check if xCoord is out of bounds
+    IF xCoord < 0 THEN GOTO PrintMessageExit
+    IF xCoord > 319 THEN GOTO PrintMessageExit
+
+    ' Buffer to save a portion of the screen
+    DIM screenBuffer(10000)
+
+    ' Save a portion of the screen to buffer
+    GET (0, 0)-(100, 7), screenBuffer
+
+    ' Print the message on the screen
+    LOCATE 1, 1
+    PRINT message$
+
+    ' Determine the color for the text
+    textColor = colr
+
+    ' Loop through each character in the message
+    FOR x = 0 TO LEN(message$) * 8 - 1
+        ' Loop through each pixel in the character
+        FOR y = 0 TO 7
+            ' Check if the pixel is part of the character
+            IF POINT(x, y) > 0 THEN
+                ' Calculate the coordinates for the enlarged pixel
+                resizedX = x * size + xCoord
+                resizedY = y * size + yCoord
+                ' Draw the pixel based on the color value
+                IF colr > 100 THEN
+                    textColor = RND * 4 + 10
+                    ' Draw a solid box or outlined box based on the color value
+                    IF colr > 200 THEN
+                        LINE (resizedX, resizedY)-(resizedX + size - 1, resizedY + size - 1), textColor, B
+                    ELSE
+                        LINE (resizedX, resizedY)-(resizedX + size - 1, resizedY + size - 1), textColor, BF
+                    END IF
+                END IF
+            END IF
+        NEXT y
+    NEXT x
+
+    ' Restore the saved portion of the screen
+    PUT (0, 0), screenBuffer, PSET
+
+PrintMessageExit:
+END SUB
+
+' Subroutine to add a timer element
+SUB addTimerElement (elementIndex!, time!, value!)
+    ' Loop through each element in the timer array
+    FOR index = 0 TO 100
+        ' Check if the current element is empty
+        IF (timerTime(elementIndex, index) = 0) AND (timerValue(elementIndex, index) = 0) THEN GOTO AddTimerElement
+    NEXT index
+
+AddTimerElement:
+    ' Add the new timer element
+    timerTime(elementIndex, index) = time
+    timerValue(elementIndex, index) = value
+END SUB
+
+' Subroutine to initialize the timer system
+SUB initializeTimers
+    ' Store the current time
+    timerLastFrameTime = TIMER
+
+    ' Set the pause duration
+    pauseDuration = 24
+
+    ' Initialize size values
+    addTimerElement 0, 0, 50
+    addTimerElement 0, 7, 10
+    addTimerElement 0, 20, 10
+    addTimerElement 0, 24, 0
+    addTimerElement 0, 1000, 0
+
+    ' Initialize speed values
+    addTimerElement 1, 0, .1
+    addTimerElement 1, 1000, 1000
+
+    ' Initialize X & Y positions
+    addTimerElement 2, 0, 160
+    addTimerElement 3, 0, 100
+    addTimerElement 2, 5, 160
+    addTimerElement 3, 5, 100
+    addTimerElement 2, 9, 280
+    addTimerElement 3, 9, 160
+    addTimerElement 2, 10, 280
+    addTimerElement 3, 10, 160
+    addTimerElement 2, 20, 40
+    addTimerElement 3, 20, 160
+    addTimerElement 2, 1000, 40
+    addTimerElement 3, 1000, 160
+
+    ' Initialize rotation values
+    addTimerElement 4, 0, .1
+    addTimerElement 4, 10, .1
+    addTimerElement 4, 22, 18
+    addTimerElement 4, 2000, 10000
+
+    ' Initialize KHK message X position
+    addTimerElement 5, 0, -1
+    addTimerElement 5, 5, -1
+    addTimerElement 5, 9, 50
+    addTimerElement 5, 10, 30
+    addTimerElement 5, pauseDuration, 30
+    addTimerElement 5, pauseDuration + 2, 321
+
+    ' Initialize ellips Y & radius
+    addTimerElement 6, 0, -1
+    addTimerElement 6, 4, -1
+    addTimerElement 6, 10, 30
+    addTimerElement 6, 1000, 50
+    addTimerElement 7, 0, 1
+    addTimerElement 7, 6, 1
+    addTimerElement 7, 12, 130
+    addTimerElement 7, pauseDuration, 130
+    addTimerElement 7, pauseDuration + 2, 1
+
+    ' Initialize "Infotehnoloogia" message X position
+    addTimerElement 8, 0, 320
+    addTimerElement 8, 11, 320
+    addTimerElement 8, 20, 100
+    addTimerElement 8, pauseDuration, 100
+    addTimerElement 8, pauseDuration + 1, -1
+END SUB
+
+' Subroutine to process the timers
+SUB processTimers
+    ' Store the current time
+    currentTime = TIMER
+
+    ' Calculate the time difference since last frame
+    timeDifference = currentTime - timerLastFrameTime
+
+    ' Update the last frame time
+    timerLastFrameTime = currentTime
+
+    ' Loop through each timer element
+    FOR elementIndex = 0 TO 50
+        ' Calculate the current time and value of each element
+        currentElementTime = timerCurrentTime(elementIndex) + timeDifference
+        currentElementPlace = timerCurrentPlace(elementIndex)
+
+ProcessTimerElement:
+        ' Check if the next timer element is empty
+        IF timerTime(elementIndex, currentElementPlace + 1) = -1 THEN
+            ' Reset the current time and value
+            currentElementTime = 0
+            currentElementPlace = 0
+        END IF
+
+        ' Update the current time and value of each element
+        IF timerTime(elementIndex, currentElementPlace + 1) < currentElementTime THEN
+            ' Check if the next timer element is empty
+            IF timerTime(elementIndex, currentElementPlace + 1) = 0 THEN
+                ' Set the current value to the current timer value
+                timerCurrentValue(elementIndex) = timerValue(elementIndex, currentElementPlace)
+                GOTO UpdateTimerElement
+            END IF
+            ' Move to the next timer element
+            currentElementPlace = currentElementPlace + 1
+            GOTO ProcessTimerElement
+        END IF
+
+        ' Interpolate the current value based on time difference
+        value1 = timerValue(elementIndex, currentElementPlace)
+        time1 = timerTime(elementIndex, currentElementPlace)
+        value2 = timerValue(elementIndex, currentElementPlace + 1)
+        time2 = timerTime(elementIndex, currentElementPlace + 1)
+
+        IF value1 = value2 THEN
+            ' Set the current value to the first value
+            timerCurrentValue(elementIndex) = value1
+        ELSE
+            ' Calculate the time difference and value difference
+            timeDiff1 = time2 - time1
+            timeDiff2 = currentElementTime - time1
+            valueDiff = value2 - value1
+            ' Interpolate the current value
+            timerCurrentValue(elementIndex) = timeDiff2 / timeDiff1 * valueDiff + value1
+        END IF
+
+UpdateTimerElement:
+        ' Update the current place and time of each element
+        timerCurrentPlace(elementIndex) = currentElementPlace
+        timerCurrentTime(elementIndex) = currentElementTime
+    NEXT elementIndex
+END SUB
+
+' Subroutine to turn on the screen
+SUB initializeGraphics
+    ' Set up graphics mode
+    SCREEN 7, , , 1
+
+    ' Draw initial shapes
+    FOR x = 0 TO 160 STEP 15
+        LINE (160 - x - 5, 90 - 5)-(160 + x + 5, 110 + 5), 1, BF
+        LINE (160 - x - 3, 90 - 3)-(160 + x + 3, 110 + 3), 3, BF
+        LINE (160 - x, 90)-(160 + x, 110), 15, BF
+
+        ' Copy screen buffer and clear the screen
+        PCOPY 0, 1
+        CLS
+
+        ' Use sound function to create delay, to limit animation speed
+        SOUND 0, .5
+    NEXT x
+
+    ' Draw additional shapes
+    FOR y = 10 TO 100 STEP 15
+        CLS
+        LINE (160 - x - 5, 90 - y - 5)-(160 + x + 5, 110 + y + 5), 1, BF
+        LINE (160 - x - 3, 90 - y - 3)-(160 + x + 3, 110 + y + 3), 3, BF
+        LINE (160 - x, 90 - y)-(160 + x, 110 + y), 15, BF
+        PCOPY 0, 1
+        SOUND 0, .5
+    NEXT y
+
+    ' Draw zeroes and ones at random locations for decoration
+    FOR counter = 1 TO 25
+        printMessage RND * 250, RND * 180, STR$(INT(RND * 2)), 3, 0
+
+        ' Copy screen buffer and clear the screen
+        PCOPY 0, 1
+
+        ' Use sound function to create delay, to limit animation speed
+        SOUND 0, 1
+    NEXT counter
+
+    ' Buffer to save parts of the screen
+    DIM screenPartBuffer(1 TO 1000)
+
+    ' Shift parts of the screen randomly
+    FOR shiftCounter = 1 TO 30
+        FOR lineCounter = 0 TO 195
+            threshold = ABS(100 - lineCounter)
+
+            ' Check if a random condition is met
+            IF RND * 50 < threshold THEN
+                GET (1, lineCounter)-(318, lineCounter + 1), screenPartBuffer
+
+                ' Shift the screen buffer
+                IF lineCounter > 100 THEN
+                    PUT (0, lineCounter), screenPartBuffer, PSET
+                ELSE
+                    PUT (2, lineCounter), screenPartBuffer, PSET
+                END IF
+            END IF
+        NEXT lineCounter
+
+        ' Copy screen buffer and clear the screen
+        PCOPY 0, 1
+    NEXT shiftCounter
+END SUB
diff --git a/2D GFX/Fractals/fractal circles animated.webm b/2D GFX/Fractals/fractal circles animated.webm
new file mode 100644
index 0000000..f112e49
Binary files /dev/null and b/2D GFX/Fractals/fractal circles animated.webm differ
diff --git a/2D GFX/Fractals/fractal circles.bas b/2D GFX/Fractals/fractal circles.bas
new file mode 100755
index 0000000..f5c1665
--- /dev/null
+++ b/2D GFX/Fractals/fractal circles.bas	
@@ -0,0 +1,121 @@
+DECLARE SUB drawFractal (x!, y!, angle AS SINGLE, size AS SINGLE, w AS INTEGER)
+' Renders a spiral fractal made up of circles using recursion.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+' Declare shared variables to be used across the program
+DIM SHARED depth AS INTEGER
+DIM SHARED pi AS SINGLE
+
+' Define scaling factors for horizontal and vertical directions
+DIM SHARED scaleH1 AS SINGLE, scaleH2 AS SINGLE, scaleV1 AS SINGLE, scaleV2 AS SINGLE
+DIM SHARED hp AS SINGLE, vp AS SINGLE
+
+' Initialize constants
+pi = 3.14159
+
+SCREEN 12 ' Set the screen mode to 12 for better graphics quality
+
+' Define scaling factors and direction variables
+scaleV1 = 5 ' Vertical scale factor for one direction
+scaleV2 = 2 ' Vertical scale factor for another direction
+vp = .2  ' Vertical angle increment
+
+scaleH1 = 2 ' Horizontal scale factor for one direction
+scaleH2 = 1.4 ' Horizontal scale factor for another direction
+hp = .2  ' Horizontal angle increment
+
+' Start the fractal drawing process from the center of the screen
+drawFractal 320, 240, pi - .9, 50, 0
+
+' Wait for user input to exit the program gracefully
+a$ = INPUT$(1)
+SYSTEM ' Terminate the program
+
+SUB drawFractal (x, y, angle AS SINGLE, size AS SINGLE, w AS INTEGER)
+    depth = depth + 1 ' Increment the recursion depth
+
+    IF size < .2 THEN GOTO 1  ' Base case for recursion termination
+
+    ' Determine color based on the current depth
+    IF depth MOD 2 = 0 THEN
+        c = 15 ' White
+    ELSE
+        c = 10 ' Light green
+    END IF
+
+    CIRCLE (x, y), size, c ' Draw a circle at the current position and size with specified color
+    PAINT (x, y), c ' Fill the circle to create a solid shape
+
+    ' Recursive calls for different directions based on the parameter w
+    IF w <> 1 THEN
+        ' Calculate new coordinates after rotating angle + vp degrees
+        x1 = SIN(angle) * size * 2.5 + x
+        y1 = COS(angle) * size * 2.5 + y
+
+        ' Determine scaling factor based on the direction
+        IF w = 3 THEN
+            newSize = size / scaleV2
+        ELSE
+            newSize = size / scaleV1
+        END IF
+
+        drawFractal x1, y1, angle + vp, newSize, 3 ' Recursive call to the same subroutine with updated parameters
+    END IF
+
+    IF w <> 2 THEN
+        ' Calculate new coordinates after rotating angle - pi/2 degrees
+        x1 = SIN(angle - .5 * pi) * size * 2.5 + x
+        y1 = COS(angle - .5 * pi) * size * 2.5 + y
+
+        ' Determine scaling factor based on the direction
+        IF w = 4 THEN
+            newSize = size / scaleH2
+        ELSE
+            newSize = size / scaleH1
+        END IF
+
+        drawFractal x1, y1, angle + hp, newSize, 4 ' Recursive call to the same subroutine with updated parameters
+    END IF
+
+    IF w <> 3 THEN
+        ' Calculate new coordinates after rotating angle - pi degrees
+        x1 = SIN(angle - pi) * size * 2.5 + x
+        y1 = COS(angle - pi) * size * 2.5 + y
+
+        ' Determine scaling factor based on the direction
+        IF w = 1 THEN
+            newSize = size / scaleV2
+        ELSE
+            newSize = size / scaleV1
+        END IF
+
+        drawFractal x1, y1, angle + vp, newSize, 1 ' Recursive call to the same subroutine with updated parameters
+    END IF
+
+    IF w <> 4 THEN
+        ' Calculate new coordinates after rotating angle - pi*3/2 degrees
+        x1 = SIN(angle - 1.5 * pi) * size * 2.5 + x
+        y1 = COS(angle - 1.5 * pi) * size * 2.5 + y
+
+        ' Determine scaling factor based on the direction
+        IF w = 2 THEN
+            newSize = size / scaleH2
+        ELSE
+            newSize = size / scaleH1
+        END IF
+
+        drawFractal x1, y1, angle + hp, newSize, 2 ' Recursive call to the same subroutine with updated parameters
+    END IF
+
+1
+    depth = depth - 1 ' Decrement recursion depth after all recursive calls are made
+END SUB
+
diff --git a/2D GFX/Fractals/fractal circles.png b/2D GFX/Fractals/fractal circles.png
new file mode 100644
index 0000000..5d03f87
Binary files /dev/null and b/2D GFX/Fractals/fractal circles.png differ
diff --git a/2D GFX/Fractals/fractal squares animated.bas b/2D GFX/Fractals/fractal squares animated.bas
new file mode 100755
index 0000000..6b62704
--- /dev/null
+++ b/2D GFX/Fractals/fractal squares animated.bas	
@@ -0,0 +1,44 @@
+' Animated fractal that is made of size shifting squares.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.04, Initial version
+' 2024.08, Improved program readability
+
+
+DECLARE SUB drawFractal (x!, y!, s!)
+DIM SHARED recursionDepth
+DIM SHARED factor1, factor2, factor3, factor4
+SCREEN 7, , , 1
+
+recursionDepth = 1
+
+1
+frameCount = frameCount + 1
+factor1 = SIN(frameCount / 19) * 1 + 3
+factor2 = SIN(frameCount / 12) * 1 + 3
+factor3 = SIN(frameCount / 17) * 1 + 3
+factor4 = SIN(frameCount / 22) * 1 + 3
+PCOPY 0, 1
+CLS
+drawFractal 160, 100, 40
+SOUND 0, .4
+userInput$ = INKEY$
+IF userInput$ <> "" THEN SYSTEM
+GOTO 1
+
+SUB drawFractal (x, y, s)
+    IF s > 1 THEN
+        recursionDepth = recursionDepth + 1
+        LINE (x - s, y - s)-(x + s, y + s), recursionDepth, BF
+        drawFractal x - s, y - s, s / factor1
+        drawFractal x + s, y - s, s / factor2
+        drawFractal x + s, y + s, s / factor3
+        drawFractal x - s, y + s, s / factor4
+        recursionDepth = recursionDepth - 1
+    END IF
+END SUB
diff --git a/2D GFX/Fractals/fractal squares animated.webm b/2D GFX/Fractals/fractal squares animated.webm
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diff --git a/2D GFX/Fractals/fractal squares, 1.png b/2D GFX/Fractals/fractal squares, 1.png
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diff --git a/2D GFX/Fractals/fractal squares, 2.png b/2D GFX/Fractals/fractal squares, 2.png
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diff --git a/2D GFX/Fractals/fractal squares.bas b/2D GFX/Fractals/fractal squares.bas
new file mode 100755
index 0000000..638b02b
--- /dev/null
+++ b/2D GFX/Fractals/fractal squares.bas	
@@ -0,0 +1,53 @@
+DECLARE SUB drawFractalPattern (centerX!, centerY!, size!)
+DIM SHARED currentColor ' This variable holds the color of the fractal and is accessible within submodules.
+
+' Program renders fractal that is made from squares.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+
+' Set the screen to high-resolution graphics mode.
+SCREEN 12
+
+' Initialize the fractal color.
+currentColor = 10
+
+' Draw a single fractal pattern at the center of the screen with a size of 127.
+drawFractalPattern 320, 240, 127
+
+' Loop to create a delay using the SOUND command.
+FOR iterationCounter = 1 TO 50
+    SOUND 0, 1 ' This creates a short delay by generating an inaudible sound.
+NEXT iterationCounter
+
+' Clear the screen to prepare for the next set of drawings.
+CLS
+
+' Loop to draw a series of fractal patterns with varying sizes and random colors.
+FOR iterationCounter = 1 TO 128 STEP 5
+    currentColor = RND * 7 + 7 ' Set the fractal color to a random value between 7 and 14.
+    drawFractalPattern 320, 240, iterationCounter ' Draw the fractal pattern with the current size.
+NEXT iterationCounter
+
+' Loop to create another delay using the SOUND command.
+FOR iterationCounter = 1 TO 50
+    SOUND 0, 1 ' This creates a short delay by generating an inaudible sound.
+NEXT iterationCounter
+
+' Subroutine to draw a fractal pattern using recursion.
+SUB drawFractalPattern (centerX, centerY, size)
+    ' Check if the size is greater than or equal to 1 to continue drawing.
+    IF size >= 1 THEN
+        ' Draw a square (box) centered at (centerX, centerY) with the current color.
+        LINE (centerX - size, centerY - size)-(centerX + size, centerY + size), currentColor, B
+
+        ' Recursively call the subroutine to draw smaller fractal patterns at the corners of the current square.
+        drawFractalPattern centerX - size, centerY - size, size / 2.3
+        drawFractalPattern centerX + size, centerY - size, size / 2.3
+        drawFractalPattern centerX + size, centerY + size, size / 2.3
+        drawFractalPattern centerX - size, centerY + size, size / 2.3
+    END IF
+END SUB
diff --git a/2D GFX/Fractals/fractal trees.bas b/2D GFX/Fractals/fractal trees.bas
new file mode 100755
index 0000000..fe74278
--- /dev/null
+++ b/2D GFX/Fractals/fractal trees.bas	
@@ -0,0 +1,54 @@
+' Animated tree fractal.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.04, Initial version
+' 2024.08, Improved program readability
+
+DECLARE SUB generateFractal (x!, y!, s!)
+
+DECLARE SUB generateArt (x!, y!, s!)
+DIM SHARED modifier1, modifier2, modifier3
+DIM SHARED vector1X, vector1Y
+DIM SHARED vector2X, vector2Y
+DIM SHARED vector3X, vector3Y
+SCREEN 7, , , 1
+
+1
+frame = frame + 1
+modifier1 = SIN(frame / 19) + 3
+modifier2 = SIN(frame / 12) + 3
+modifier3 = SIN(frame / 17) + 3
+
+vector1X = SIN(frame / 13) / 3 + 1
+vector1Y = SIN(frame / 18) / 3 + 1
+
+vector2X = SIN(frame / 20) / 3 + 1
+vector2Y = SIN(frame / 28) / 3 + 1
+
+vector3X = SIN(frame / 31) / 3 + 1
+vector3Y = SIN(frame / 24) / 3 + 1
+
+PCOPY 0, 1
+CLS
+generateFractal 160, 180, 80
+SOUND 0, .5
+inputKey$ = INKEY$
+IF inputKey$ <> "" THEN SYSTEM
+GOTO 1
+
+SUB generateFractal (x, y, s)
+    IF s > 1 THEN
+        LINE (x, y)-(x - s * vector1X, y - s * vector1Y), 15
+        LINE (x, y)-(x + s * vector2X, y - s * vector2Y), 15
+        LINE (x, y)-(x, y - s), 15
+        generateFractal x - s * vector1X, y - s * vector1Y, s / modifier1
+        generateFractal x + s * vector2X, y - s * vector2Y, s / modifier2
+        generateFractal x, y - s, s / modifier3
+    END IF
+END SUB
+
diff --git a/2D GFX/Fractals/fractal trees.webm b/2D GFX/Fractals/fractal trees.webm
new file mode 100644
index 0000000..9d4fa52
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diff --git a/2D GFX/Fractals/index.html b/2D GFX/Fractals/index.html
new file mode 100644
index 0000000..96269ef
--- /dev/null
+++ b/2D GFX/Fractals/index.html	
@@ -0,0 +1,321 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2025-07-28 ma 03:32 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Fractals</title>
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
+  .subtitle { text-align: center;
+              font-size: medium;
+              font-weight: bold;
+              margin-top:0; }
+  .todo   { font-family: monospace; color: red; }
+  .done   { font-family: monospace; color: green; }
+  .priority { font-family: monospace; color: orange; }
+  .tag    { background-color: #eee; font-family: monospace;
+            padding: 2px; font-size: 80%; font-weight: normal; }
+  .timestamp { color: #bebebe; }
+  .timestamp-kwd { color: #5f9ea0; }
+  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
+  .org-left   { margin-left: 0px;  margin-right: auto; text-align: left; }
+  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #e6e6e6;
+    border-radius: 3px;
+    background-color: #f2f2f2;
+    padding: 8pt;
+    font-family: monospace;
+    overflow: auto;
+    margin: 1.2em;
+  }
+  pre.src {
+    position: relative;
+    overflow: auto;
+  }
+  pre.src:before {
+    display: none;
+    position: absolute;
+    top: -8px;
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+    padding: 3px;
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+  }
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+  /* Languages per Org manual */
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+  /* pre.src-C++ doesn't work in CSS */
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+  pre.src-ditaa:before { content: 'ditaa'; }
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+  pre.src-latex:before { content: 'LaTeX'; }
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+  pre.src-shell:before { content: 'Shell Script'; }
+  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
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+       in ob-*.el */
+  pre.src-cpp:before  { content: 'C++'; }
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+  pre.src-coq:before  { content: 'Coq'; }
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+  pre.src-plain-tex:before { content: 'Plain TeX'; }
+  pre.src-verilog:before { content: 'Verilog'; }
+  pre.src-vhdl:before { content: 'VHDL'; }
+  pre.src-xml:before { content: 'XML'; }
+  pre.src-nxml:before { content: 'XML'; }
+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
+  caption.t-above { caption-side: top; }
+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
+  th.org-left   { text-align: center;   }
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+  dt { font-weight: bold; }
+  .footpara { display: inline; }
+  .footdef  { margin-bottom: 1em; }
+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
+  .org-info-js_info-navigation { border-style: none; }
+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
+<style type="text/css">
+               body {
+                 max-width: 35cm !important;
+               }
+               #content {
+                 max-width: 80em !important;
+                 width: 90%;
+               }
+               </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">Fractals</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#orgf8fab95">1. Fractal circles</a></li>
+<li><a href="#orgeb3421b">2. Fractal circles animated</a></li>
+<li><a href="#org8bc5d61">3. Fractal of squares</a></li>
+<li><a href="#orga748cab">4. Fractal of squares animated</a></li>
+<li><a href="#orgfd9ef84">5. Fractal of trees</a></li>
+</ul>
+</div>
+</div>
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+
+
+<div id="outline-container-orgf8fab95" class="outline-2">
+<h2 id="orgf8fab95"><span class="section-number-2">1.</span> Fractal circles</h2>
+<div class="outline-text-2" id="text-1">
+
+<div id="org81b1864" class="figure">
+<p><a href="fractal circles.bas" class="responsive-img"><img src="fractal%20circles.png" alt="fractal%20circles.png" class="responsive-img" /></a>
+</p>
+</div>
+
+<p>
+<a href="fractal circles.bas">Source code</a>
+</p>
+</div>
+</div>
+
+<div id="outline-container-orgeb3421b" class="outline-2">
+<h2 id="orgeb3421b"><span class="section-number-2">2.</span> Fractal circles animated</h2>
+<div class="outline-text-2" id="text-2">
+<div class="flex-center">
+  <video controls loop autoplay class="flex-center">
+    <source src="fractal circles animated.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+<p>
+<a href="fractal circles animated.bas">Source code</a>
+</p>
+</div>
+</div>
+
+<div id="outline-container-org8bc5d61" class="outline-2">
+<h2 id="org8bc5d61"><span class="section-number-2">3.</span> Fractal of squares</h2>
+<div class="outline-text-2" id="text-3">
+
+<div id="org349adb0" class="figure">
+<p><a href="fractal squares.bas" class="responsive-img"><img src="fractal%20squares,%201.png" alt="fractal%20squares,%201.png" class="responsive-img" /></a>
+</p>
+</div>
+
+
+<div id="orgf1ed4b8" class="figure">
+<p><a href="fractal squares.bas" class="responsive-img"><img src="fractal%20squares,%202.png" alt="fractal%20squares,%202.png" class="responsive-img" /></a>
+</p>
+</div>
+</div>
+</div>
+
+<div id="outline-container-orga748cab" class="outline-2">
+<h2 id="orga748cab"><span class="section-number-2">4.</span> Fractal of squares animated</h2>
+<div class="outline-text-2" id="text-4">
+<div class="flex-center">
+  <video controls loop autoplay class="flex-center">
+    <source src="fractal squares animated.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+<p>
+<a href="fractal squares animated.bas">Source code</a>
+</p>
+</div>
+</div>
+
+<div id="outline-container-orgfd9ef84" class="outline-2">
+<h2 id="orgfd9ef84"><span class="section-number-2">5.</span> Fractal of trees</h2>
+<div class="outline-text-2" id="text-5">
+<div class="flex-center">
+  <video controls loop autoplay class="flex-center">
+    <source src="fractal trees.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+<p>
+<a href="fractal trees.bas">Source code</a>
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2025-07-28 ma 03:32</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/2D GFX/Fractals/index.org b/2D GFX/Fractals/index.org
new file mode 100644
index 0000000..0480898
--- /dev/null
+++ b/2D GFX/Fractals/index.org	
@@ -0,0 +1,79 @@
+#+TITLE: Fractals
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+#+begin_export html
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+#+end_export
+
+
+* Fractal circles
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:fractal circles.bas][file:fractal%20circles.png]]
+
+[[file:fractal circles.bas][Source code]]
+
+* Fractal circles animated
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay class="flex-center">
+    <source src="fractal circles animated.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+[[file:fractal circles animated.bas][Source code]]
+
+* Fractal of squares
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:fractal squares.bas][file:fractal%20squares,%201.png]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:fractal squares.bas][file:fractal%20squares,%202.png]]
+
+* Fractal of squares animated
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay class="flex-center">
+    <source src="fractal squares animated.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+[[file:fractal squares animated.bas][Source code]]
+
+* Fractal of trees
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay class="flex-center">
+    <source src="fractal trees.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+[[file:fractal trees.bas][Source code]]
diff --git a/2D GFX/Hello friend.bas b/2D GFX/Hello friend.bas
new file mode 100755
index 0000000..93dade2
--- /dev/null
+++ b/2D GFX/Hello friend.bas	
@@ -0,0 +1,39 @@
+' 2D graphics demonstration.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+
+SCREEN 13
+
+LOCATE 1, 1
+PRINT "   Hello friend!"
+
+' Loop through each pixel in the screen to create an enlarged version of the current screen
+FOR x = 0 TO 160
+    FOR y = 0 TO 32
+        colorVal = POINT(x, y)
+        x1 = x * 2
+        y1 = y * 2 + 90
+        LINE (x1, y1)-(x1 + 1, y1 + 1), colorVal, BF
+    NEXT y
+NEXT x
+
+LOCATE 1, 1
+PRINT "                     "
+
+' Draw a series of circles along the screen
+FOR x = 0 TO 320
+    CIRCLE (x, 130), 10, 9
+    SOUND 0, .1
+NEXT x
+
+' Draw horizontal lines creating an X pattern
+FOR y = 0 TO 70
+    SOUND 0, .1
+    LINE (160 - 70 + y, y)-(160 + 70 - y, y), 9
+NEXT y
+
+
diff --git a/2D GFX/Hello friend.png b/2D GFX/Hello friend.png
new file mode 100644
index 0000000..c75768f
Binary files /dev/null and b/2D GFX/Hello friend.png differ
diff --git a/2D GFX/People.bas b/2D GFX/People.bas
new file mode 100755
index 0000000..60161a5
--- /dev/null
+++ b/2D GFX/People.bas	
@@ -0,0 +1,895 @@
+' Example slideshow presentation. Includes animated transitions.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001, Initial version
+' 2024 - 2025, Improved program readability
+
+
+DECLARE SUB displaySlide1 ()
+DECLARE SUB setink (a!)
+DECLARE SUB inke (a$)
+DECLARE SUB mkjuku (x!, y!, a!, c!)
+DECLARE SUB pr (x!, y!, s!, c!, n!, a$)
+DECLARE SUB wpr ()
+DECLARE SUB displayEffect7 ()
+DECLARE SUB displaySlide6 ()
+DECLARE SUB displaySlide5 ()
+DECLARE SUB pal4 (c, r!, g!, b!)
+DECLARE SUB displaySlide4 ()
+DECLARE SUB inpur ()
+DECLARE SUB displayEffect5 ()
+DECLARE SUB displaySlide3 ()
+DECLARE SUB prin (x1!, y1!, s!, c, a$)
+DECLARE SUB pal3 (r!, g!, b!)
+DECLARE SUB mkfont ()
+DECLARE SUB pal2 (r!, g!, b!)
+DECLARE SUB box1 (x1!, y1!, x2!, y2!, c!)
+DECLARE SUB mkback ()
+DECLARE SUB displaySlide2 ()
+DECLARE SUB resiz ()
+DECLARE SUB pri (x!, y!, a$, c!)
+DECLARE SUB deca (xs!, ys!, fx!, fy!)
+DECLARE SUB box (xs!, ys!)
+DECLARE SUB displayEffect4 ()
+DECLARE SUB displayEffect3 ()
+DECLARE SUB displayEffect2 ()
+DECLARE SUB displayEffect1 ()
+DECLARE SUB start ()
+DECLARE SUB sc1 ()
+DECLARE SUB pal (x!)
+DIM SHARED fontt(0 TO 7, 0 TO 7, 0 TO 255)
+DIM SHARED tim
+DIM SHARED tim2
+DIM SHARED jas(1 TO 500)
+DIM SHARED pii
+DIM SHARED tmr
+DIM SHARED ink
+DIM SHARED tim$
+
+start
+
+CLS
+'GOTO 8
+
+displaySlide1
+displayEffect1
+displayEffect2
+displayEffect3
+
+displayEffect4
+displaySlide2
+displaySlide4
+8
+displaySlide5
+displaySlide6
+
+displayEffect7
+displaySlide3
+displayEffect5
+
+SYSTEM
+
+SUB box (xs, ys)
+' Draws a 3D style box border at the top-left corner of the screen
+' Parameters:
+'   xs - width of the box
+'   ys - height of the box
+
+LINE (0, 186)-(0 + xs, 186 - ys), 15, B
+LINE (1, 187)-(-1 + xs, 187 - ys), 25, B
+LINE (2, 188)-(-2 + xs, 188 - ys), 15, B
+PSET (0, 188), 0
+PSET (0 + xs, 188), 0
+PSET (0, 186 - ys), 0
+PSET (0 + xs, 186 - ys), 0
+END SUB
+
+DEFINT Z
+SUB box1 (x1, y1, x2, y2, c)
+
+' Draws a shaded box with a 3D effect
+' Parameters:
+'   x1, y1 - top-left corner coordinates
+'   x2, y2 - bottom-right corner coordinates
+'   c - type of shading
+
+IF c = 1 THEN za = 51 ELSE za = 102
+
+FOR zy = y1 + 7 TO y2 + 7
+FOR zx = x1 + 7 TO x2 + 7
+zc = POINT(zx, zy)
+IF zc < 51 THEN
+IF zc > 25 THEN zc = 50 - zc
+zc = zc / 2
+PSET (zx, zy), zc
+END IF
+NEXT zx
+NEXT zy
+
+FOR zy = y1 TO y2
+FOR zx = x1 TO x2
+zc = POINT(zx, zy)
+IF zc > 50 THEN zc = zc - 51
+PSET (zx, zy), zc + za
+NEXT zx
+NEXT zy
+
+END SUB
+
+DEFSNG Z
+SUB deca (xs, ys, fx, fy)
+LINE (0, 185 - ys)-(xs, 185 - ys + fy), 0, BF
+LINE (xs, 18 - ys)-(xs - fx, 188), 0, BF
+xs = xs - fx
+ys = ys - fy
+box xs, ys
+END SUB
+
+SUB displayEffect1
+
+pal 3
+
+DIM buf1(1 TO 10000)
+DIM buf2(1 TO 10000)
+DIM buf3(1 TO 400)
+
+FOR a = 1 TO 320
+buf3(a) = 200
+NEXT a
+
+b = 0
+c1 = 1
+setink 10
+1
+c1 = c1 + 1
+IF c1 > 50 THEN c1 = 1
+LINE (0, 40)-(0, 43), c1
+c2 = c1
+IF c2 > 25 THEN c2 = 50 - c2
+c2 = c2 - 5
+IF c2 < 0 THEN c2 = 0
+PSET (0, 39), c2
+PSET (0, 44), c2
+LINE (319, 76)-(319, 79), c1
+PSET (319, 75), c2
+PSET (319, 80), c2
+
+GET (0, 39)-(318, 44), buf1(1)
+PUT (1, 39), buf1(1), PSET
+
+GET (1, 75)-(319, 80), buf1(1)
+PUT (0, 75), buf1(1), PSET
+
+b = b + 1
+buf3(271) = SIN(b / 50 + 1.57) * 30 + 160
+FOR x = 50 TO 270
+PSET (x, buf3(x) - 1), 0
+IF x > 50 THEN
+PSET (x, buf3(x)), 15
+PSET (x, buf3(x) + 1), 20
+PSET (x, buf3(x) + 2), 25
+END IF
+buf3(x) = buf3(x + 1)
+NEXT x
+
+a = 50
+FOR x = 65 + 18 TO 270 STEP 40
+a = a + 1
+IF buf3(x - 1) < 190 THEN
+mkjuku x, buf3(x - 1) - 27, x, 0
+mkjuku x, buf3(x) - 27, x, a
+END IF
+NEXT x
+
+inke a$
+SOUND 0, .4
+IF a$ = "" THEN GOTO 1
+
+END SUB
+
+SUB displayEffect2
+
+FOR a = 1 TO 30
+e = 0
+c = (3.8 * (30 - a)) / 30
+
+FOR f = 0 TO 50
+IF f < 25 THEN e = e + 4 ELSE e = e - c
+OUT &H3C8, f
+OUT &H3C9, e / 4
+OUT &H3C9, e / 1.9
+OUT &H3C9, e / 3
+NEXT f
+
+FOR b = 1 TO 3
+SOUND 0, .3
+NEXT b
+NEXT a
+
+FOR a = 20 TO 0 STEP -1
+b = (a * 4) / 20
+e = 0
+FOR f = 0 TO 60
+IF f < 25 THEN e = e + b
+OUT &H3C8, f
+OUT &H3C9, e / 4
+OUT &H3C9, e / 1.9
+OUT &H3C9, e / 3
+NEXT f
+
+FOR b = 1 TO 2
+SOUND 0, .3
+NEXT b
+
+NEXT a
+
+END SUB
+
+SUB displayEffect3
+SCREEN 7
+SCREEN 7, , , 1
+
+OUT &H3C8, 1
+OUT &H3C9, 64 / 4
+OUT &H3C9, 64 / 1.9
+OUT &H3C9, 64 / 3
+
+b = 2
+c = .01
+2
+x = x + 1
+y = y + 1
+c = c + .01
+b = b + c
+
+FOR a = 0 TO 160 STEP b
+LINE (160 + a, 0)-(160 + a, 199), 1
+LINE (160 - a, 0)-(160 - a, 199), 1
+LINE (0, 100 + a)-(319, 100 + a), 1
+LINE (0, 100 - a)-(319, 100 - a), 1
+NEXT a
+
+PCOPY 0, 1
+CLS
+SOUND 0, .4
+IF b < 50 THEN GOTO 2
+
+SCREEN 13
+pal 2
+
+FOR a = 0 TO 160 STEP b
+LINE (160 + a, 0)-(160 + a, 199), 25
+LINE (160 - a, 0)-(160 - a, 199), 25
+LINE (0, 100 + a)-(319, 100 + a), 25
+LINE (0, 100 - a)-(319, 100 - a), 25
+NEXT a
+
+resiz
+pal 3
+
+pri 11, 8, "-* A U T H O R S *-", 55
+pri 10, 11, CHR$(254) + " John Doe", 55
+pri 10, 13, CHR$(254) + " Jane Doe", 55
+pri 10, 15, CHR$(254) + " Anonymous", 55
+pri 20, 19, "year 2001", 55
+
+inpur
+CLS
+END SUB
+
+SUB displayEffect4
+pal 2
+xs = 317
+ys = 185
+box xs, ys
+tey = 20
+
+DIM buf4(1 TO 10000)
+
+b = 0
+setink 10
+COLOR 25
+4
+b = b + 1
+
+SELECT CASE b
+CASE 50 TO 200
+deca xs, ys, 1, 1
+
+CASE 201
+'pal4 255, 63, 45, 0
+'prin 10, tey, 2, 255, "Sources:"
+tey = tey + 20
+
+CASE 290
+pal4 254, 20, 20, 63
+prin 70, tey, 7, 254, "TEST"
+tey = tey + 60
+
+CASE 350
+pal4 254, 20, 20, 63
+prin 100, tey, 2, 254, "www.12345.com"
+tey = tey + 20
+
+CASE 400
+pal4 254, 20, 20, 63
+prin 100, tey, 2, 254, CHR$(16) + "Subject 1"
+tey = tey + 10
+
+END SELECT
+
+FOR a = 2 TO (xs - 5) / 8
+LOCATE 23, a
+PRINT CHR$(RND * 1 + 48)
+NEXT a
+
+FOR x = 3 TO xs - 3 STEP 8
+GET (x, 183 - ys + 14)-(x + 7, 183), buf4(1)
+PUT (x, 183 - ys + 6), buf4(1), PSET
+NEXT x
+
+inke a$
+
+IF a$ <> "" THEN GOTO 3
+wpr
+GOTO 4
+
+3
+END SUB
+
+SUB displayEffect5
+DIM buf(1 TO 5000)
+
+FOR a = 1 TO 1000
+x = RND * 298 + 1
+y = RND * 178 + 1
+GET (x, y)-(x + 19, y + 19), buf(1)
+IF RND * 100 < 50 THEN x = x + 1 ELSE x = x - 1
+IF RND * 100 < 50 THEN y = y + 1
+PUT (x, y), buf(1), PSET
+SOUND 0, .05
+NEXT a
+
+FOR a = 0 TO 100
+LINE (0, a)-(319, a), 0
+LINE (0, 200 - a)-(319, 200 - a), 0
+SOUND 0, .4
+NEXT a
+
+END SUB
+
+SUB displayEffect7
+pal 4
+mkback
+
+pal2 0, 0, 32
+box1 3, 3, 300, 50, 1
+
+pal4 255, 50, 50, 0
+prin 10, 10, 2, 255, "Et dolore magna"
+prin 50, 30, 1, 255, "www.utenimadminim.org"
+
+pal3 20, 32, 63
+box1 20, 40, 290, 180, 2
+
+pal4 254, 63, 45, 0
+b = 25
+prin 40, 60, 1, 254, CHR$(254) + " Ut enim ad minim veniam"
+a = b
+prin 40, 60 + a, 1, 254, CHR$(254) + " Quis nostrud exercitation"
+a = a + b
+prin 40, 60 + a, 1, 254, CHR$(254) + " Laboris nisi ut aliquip ex"
+a = a + b
+prin 40, 60 + a, 1, 254, CHR$(254) + " Sed ut perspiciatis unde"
+
+inpur
+
+END SUB
+
+SUB displaySlide1
+
+pal 2
+LOCATE 1, 1
+COLOR 1
+PRINT "HEADER"
+
+FOR x = 0 TO 80
+FOR y = 0 TO 16
+c = POINT(x, y)
+IF c > 0 THEN c1 = 50 ELSE c1 = 0
+LINE (x * 5 + 35, y * 3 + 50)-(x * 5 + 4 + 35, y * 3 + 2 + 50), c1, BF
+NEXT y
+NEXT x
+
+LOCATE 1, 1
+PRINT "      "
+
+FOR y = 30 TO 80
+FOR x = 0 TO 319
+c = POINT(x, y)
+c1 = (c1 * 1 + c) / 2
+PSET (x, y), c1
+NEXT x
+NEXT y
+
+FOR x = 0 TO 319
+FOR y = 30 TO 80
+c = POINT(x, y)
+c1 = (c1 * 1 + c) / 2
+PSET (x, y), c1
+NEXT y
+NEXT x
+
+FOR y = 30 TO 80
+FOR x = 319 TO 0 STEP -1
+c = POINT(x, y)
+c1 = (c1 * 1 + c) / 2
+PSET (x, y), c1
+NEXT x
+NEXT y
+
+FOR x = 0 TO 319
+FOR y = 80 TO 30 STEP -1
+c = POINT(x, y)
+c1 = (c1 * 1 + c) / 2
+PSET (x, y), c1
+NEXT y
+NEXT x
+
+END SUB
+
+SUB displaySlide2
+
+CLS
+pal 4
+mkback
+
+pal2 40, 64, 63
+pal3 0, 0, 0
+
+box1 30, 30, 290, 170, 1
+
+prin 65, 50, 3, 0, "Goal:"
+
+prin 40, 100, 1, 0, CHR$(254) + " Random text"
+prin 40, 108, 1, 0, "  goes here to test"
+prin 40, 116, 1, 0, "  text layout."
+prin 40, 130, 1, 0, CHR$(254) + " Testing 123."
+
+inpur
+
+END SUB
+
+SUB displaySlide3
+mkback
+
+pal2 64, 64, 0
+box1 30, 30, 290, 150, 1
+
+prin 57, 50, 3, 0, "Thank you"
+prin 45, 74, 3, 0, "   for"
+prin 45, 98, 3, 0, "attention"
+inpur
+
+END SUB
+
+SUB displaySlide4
+
+pal 4
+mkback
+
+pal2 0, 0, 32
+box1 3, 3, 260, 50, 1
+
+pal4 255, 50, 50, 0
+prin 10, 10, 2, 255, "Random header"
+prin 50, 30, 1, 255, "www.randomsite.org"
+
+pal3 10, 20, 0
+box1 20, 40, 290, 180, 2
+
+pal4 254, 63, 45, 0
+
+b = 25
+prin 40, 60, 1, 254, CHR$(254) + " Lorem ipsum dolor sit amet,"
+a = b
+prin 40, 60 + a, 1, 254, CHR$(254) + " consectetur adipiscing elit,"
+a = a + b
+prin 40, 60 + a, 1, 254, CHR$(254) + " sed do eiusmod"
+a = a + b
+prin 40, 60 + a, 1, 254, CHR$(254) + " tempor incididunt ut labore"
+
+inpur
+
+END SUB
+
+SUB displaySlide5
+pal 4
+mkback
+
+pal2 0, 0, 32
+box1 3, 3, 300, 50, 1
+
+pal4 255, 50, 50, 0
+prin 10, 10, 2, 255, "Totam rem aperiam"
+prin 50, 30, 1, 255, "www.randomurl.org"
+
+pal3 20, 32, 63
+box1 20, 40, 290, 180, 2
+
+pal4 254, 63, 45, 0
+b = 25
+prin 40, 60, 1, 254, CHR$(254) + " Nemo enim ipsam voluptatem"
+a = b
+prin 40, 60 + a, 1, 254, CHR$(254) + " Sed quia consequuntur"
+a = a + b
+prin 40, 60 + a, 1, 254, CHR$(254) + " Magni dolores eos"
+a = a + b
+prin 40, 60 + a, 1, 254, CHR$(254) + " Qui ratione voluptatem"
+
+inpur
+
+END SUB
+
+SUB displaySlide6
+pal 4
+mkback
+
+pal2 0, 0, 32
+box1 3, 3, 300, 50, 1
+
+pal4 255, 50, 50, 0
+prin 10, 10, 2, 255, "H E L L O !"
+prin 50, 30, 1, 255, "www.hello.net"
+
+pal3 30, 20, 10
+box1 20, 40, 290, 180, 2
+
+pal4 254, 63, 45, 0
+b = 25
+prin 40, 60, 1, 254, CHR$(254) + " Quis autem vel eum"
+a = b
+prin 40, 60 + a, 1, 254, CHR$(254) + " Iure reprehenderit qui"
+a = a + b
+prin 40, 60 + a, 1, 254, CHR$(254) + " In ea voluptate velit"
+a = a + b
+prin 40, 60 + a, 1, 254, CHR$(254) + " Esse quam nihil molestiae"
+
+inpur
+
+END SUB
+
+SUB inke (a$)
+IF tim$ <> TIME$ THEN
+ink = ink - 1
+tim$ = TIME$
+END IF
+IF (ink <= 0) AND (tmr = 1) THEN a$ = " " ELSE a$ = ""
+IF INKEY$ <> "" THEN a$ = " "
+END SUB
+
+SUB inpur
+setink 10
+11
+inke a$
+IF a$ = "" THEN GOTO 11
+END SUB
+
+DEFINT A-Z
+SUB mkback
+CLS
+lm1 = 0
+lm2 = 50
+
+s = 2 ^ 7
+
+7
+s = s \ 2
+
+FOR y = 0 TO 199 STEP s
+FOR x = 0 TO 319 STEP s
+
+c1 = POINT(x, y)
+c2 = POINT(x + s, y)
+c3 = POINT(x, y + s)
+c4 = POINT(x + s, y + s)
+
+sp = s \ 2
+
+c5 = (c1 + c2 + c3 + c4) / 4 + RND * s - sp
+IF c5 > lm2 THEN c5 = lm2
+IF c5 < lm1 THEN c5 = lm1
+
+c6 = (c2 + c4) / 2 + RND * s - sp
+IF c6 > lm2 THEN c6 = lm2
+IF c6 < lm1 THEN c6 = lm1
+
+c7 = (c3 + c4) / 2 + RND * s - sp
+IF c7 > lm2 THEN c7 = lm2
+IF c7 < lm1 THEN c7 = lm1
+
+IF INT(RND * 30) = 2 THEN c5 = 50
+PSET (x + sp, y + sp), c5
+PSET (x + s, y + sp), c6
+PSET (x + sp, y + s), c7
+
+NEXT x
+NEXT y
+IF s > 2 THEN GOTO 7
+END SUB
+
+DEFSNG A-Z
+SUB mkfont
+SCREEN 13
+FOR a = 0 TO 255
+LOCATE 1, 1
+IF a <> 7 THEN PRINT CHR$(a)
+
+FOR y = 0 TO 7
+FOR x = 0 TO 7
+fontt(x, y, a) = POINT(x, y)
+NEXT x
+NEXT y
+NEXT a
+
+END SUB
+
+SUB mkjuku (x, y, a, c)
+jas(a) = jas(a) + .08
+IF jas(a) > 30000 THEN jas(a) = 0
+b = jas(a)
+IF c = 0 THEN b = jas(a) - .08
+x1 = x + COS(b) * 10
+y1 = y + SIN(b) * 5 + 20
+
+x2 = x + COS(b) * 5 + 2
+y2 = y + SIN(b) * 3 + 10
+
+x3 = x + COS(b + 1) * 2
+y3 = y + SIN(b + 1) * 2 + 2
+
+LINE (x2, y2)-(x1, y1), c
+LINE (x2, y2)-(x3, y3), c
+
+x1 = x + COS(b + pii) * 10
+y1 = y + SIN(b + pii) * 5 + 20
+
+x2 = x + COS(b + pii) * 5 + 2
+y2 = y + SIN(b + pii) * 3 + 10
+
+LINE (x2, y2)-(x1, y1), c
+LINE (x2, y2)-(x3, y3), c
+
+x4 = x + COS(b + 1.2) * 3 - 1
+y4 = y + SIN(b + 1.2) * 1 - 10
+
+LINE (x4, y4)-(x3, y3), c
+
+x5 = x + COS(b + .5) * 13 - 3
+y5 = y + SIN(b + .5) * 2 + 1
+
+x6 = x + COS(b + .5) * 15 - 1
+y6 = y + SIN(b + .5) * 3 + 4
+
+LINE (x5, y5)-(x4, y4), c
+LINE (x5, y5)-(x6, y6), c
+
+x5 = x + COS(b + pii) * 13 - 3
+y5 = y + SIN(b + pii) * 2 + 1
+
+x6 = x + COS(b + pii) * 15 - 1
+y6 = y + SIN(b + pii) * 3 + 4
+
+LINE (x5, y5)-(x4, y4), c
+LINE (x5, y5)-(x6, y6), c
+
+x7 = x + COS(b + 1.2) * 2
+y7 = y + SIN(b + 1.2) * 1 - 14
+
+LINE (x7, y7 + 2)-(x4, y4), c
+
+CIRCLE (x7, y7), 3, c
+
+
+
+END SUB
+
+SUB pal (x)
+SELECT CASE x
+CASE 1
+
+FOR f = 0 TO 25
+OUT &H3C8, f
+OUT &H3C9, f * 4.1
+OUT &H3C9, f * 4.1
+OUT &H3C9, f * 4.1
+NEXT f
+
+CASE 2
+e = 0
+FOR f = 0 TO 50
+IF f < 25 THEN e = e + 4 ELSE e = e - 3.8
+OUT &H3C8, f
+OUT &H3C9, e / 4
+OUT &H3C9, e / 1.9
+OUT &H3C9, e / 3
+NEXT f
+CASE 3
+
+FOR f = 51 TO 60
+OUT &H3C8, f
+OUT &H3C9, SIN(f) * 30 + 30
+OUT &H3C9, SIN(f * 2) * 30 + 30
+OUT &H3C9, SIN(f * 3) * 30 + 30
+NEXT f
+
+CASE 4
+FOR f = 0 TO 25
+OUT &H3C8, f
+OUT &H3C9, f * 2.5
+OUT &H3C9, f * 2.5
+OUT &H3C9, f * 1.5
+NEXT f
+FOR f = 26 TO 50
+OUT &H3C8, f
+OUT &H3C9, (50 - f) * 2.5
+OUT &H3C9, (50 - f) * 2.5
+OUT &H3C9, (50 - f) * 1.5
+NEXT f
+
+END SELECT
+
+END SUB
+
+SUB pal2 (r, g, b)
+FOR f = 0 TO 25
+OUT &H3C8, f + 51
+OUT &H3C9, (f * 2.5 + r * 1) / 2
+OUT &H3C9, (f * 2.5 + g * 1) / 2
+OUT &H3C9, (f * 1.5 + b * 1) / 2
+NEXT f
+FOR f = 26 TO 50
+OUT &H3C8, f + 51
+OUT &H3C9, ((50 - f) * 2.5 + r * 1) / 2
+OUT &H3C9, ((50 - f) * 2.5 + g * 1) / 2
+OUT &H3C9, ((50 - f) * 1.5 + b * 1) / 2
+NEXT f
+END SUB
+
+SUB pal3 (r, g, b)
+FOR f = 0 TO 25
+OUT &H3C8, f + 102
+OUT &H3C9, (f * 2.5 + r * 1) / 2
+OUT &H3C9, (f * 2.5 + g * 1) / 2
+OUT &H3C9, (f * 1.5 + b * 1) / 2
+NEXT f
+FOR f = 26 TO 50
+OUT &H3C8, f + 102
+OUT &H3C9, ((50 - f) * 2.5 + r * 1) / 2
+OUT &H3C9, ((50 - f) * 2.5 + g * 1) / 2
+OUT &H3C9, ((50 - f) * 1.5 + b * 1) / 2
+NEXT f
+END SUB
+
+SUB pal4 (c, r!, g!, b!)
+OUT &H3C8, c
+OUT &H3C9, r
+OUT &H3C9, g
+OUT &H3C9, b
+END SUB
+
+SUB pr (x, y, s, c, n, a$)
+IF n > LEN(a$) THEN GOTO 10
+a$ = RIGHT$(LEFT$(a$, n), 1)
+x1 = n * 8 * s + x
+prin x1, y, s, c, a$
+10
+END SUB
+
+SUB pri (x, y, a$, c)
+COLOR c
+FOR a = 1 TO LEN(a$)
+b$ = RIGHT$(LEFT$(a$, a), 1)
+LOCATE y, x + a
+PRINT b$
+SOUND 0, 1
+NEXT a
+
+END SUB
+
+SUB prin (x1, y1, s, c1, a$)
+
+FOR a = 1 TO LEN(a$)
+b = ASC(RIGHT$(LEFT$(a$, a), 1))
+c = (a - 1) * 8 * s + x1
+FOR y = 0 TO 7
+FOR x = 0 TO 7
+IF fontt(x, y, b) > 0 THEN
+LINE (x * s + c, y * s + y1)-(x * s + s - 1 + c, y * s + s - 1 + y1), c1, BF
+END IF
+NEXT x
+NEXT y
+
+NEXT a
+
+END SUB
+
+SUB resiz
+
+FOR a = 1 TO 10
+CIRCLE (160, 100), a, a * 2 + 5
+NEXT a
+PSET (160, 100), 0
+
+DIM buff1(1 TO 10000)
+DIM buff2(1 TO 10000)
+
+a = 10
+GET (160 - a, 90)-(160, 110), buff1(1)
+GET (160, 90)-(160 + a, 110), buff2(1)
+5
+PUT (159 - a, 90), buff1(1), PSET
+PUT (150 + a, 90), buff2(1), PSET
+a = a + 1
+SOUND 0, .2
+IF a < 140 THEN GOTO 5
+
+a = 1
+
+GET (20, 90)-(300, 100), buff1(1)
+GET (20, 100)-(300, 110), buff2(1)
+6
+PUT (20, 90 - a), buff1(1), PSET
+PUT (20, 100 + a), buff2(1), PSET
+
+a = a + 1
+SOUND 0, .2
+IF a < 60 THEN GOTO 6
+END SUB
+
+SUB setink (a!)
+ink = a
+tim$ = TIME$
+END SUB
+
+SUB start
+SCREEN 13
+RANDOMIZE TIMER
+
+mkfont
+tim = 0
+tim2 = 0
+
+FOR a = 1 TO 500
+jas(a) = RND * 10
+NEXT a
+
+pii = 3.14
+IF COMMAND$ = "t" OR COMMAND$ = "T" THEN
+tmr = 1
+PRINT "timer is on"
+SLEEP 1
+ELSE
+tmr = 0
+END IF
+END SUB
+
+SUB wpr
+tim = tim + 1
+IF tim \ 10 = tim / 10 THEN
+a = tim / 10
+SELECT CASE tim2
+CASE 0
+IF a = 10 THEN tim2 = 1: tim = 0: pal4 255, 63, 45, 0
+CASE 1
+pr 10, 10, 2, 255, a, "Sources:"
+
+END SELECT
+END IF
+END SUB
+
diff --git a/2D GFX/People.webm b/2D GFX/People.webm
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diff --git a/2D GFX/Spirals/index.html b/2D GFX/Spirals/index.html
new file mode 100644
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+++ b/2D GFX/Spirals/index.html	
@@ -0,0 +1,944 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2025-07-28 ma 03:32 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Spiral series</title>
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
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+              font-weight: bold;
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+  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
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+       in ob-*.el */
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+     ob-shell.el: ob-shell is the only babel language using a lambda to put
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+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
+  caption.t-above { caption-side: top; }
+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
+  th.org-left   { text-align: center;   }
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+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
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+    vertical-align: middle;
+  }
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+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
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+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
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+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
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+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
+<style type="text/css">
+               body {
+                 max-width: 35cm !important;
+               }
+               #content {
+                 max-width: 80em !important;
+                 width: 90%;
+               }
+               </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">Spiral series</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#orga69a35d">1. Spiral with increasing density</a></li>
+<li><a href="#org48ee846">2. Spiral with varying height</a></li>
+<li><a href="#org4bb74ce">3. Shaded spiral</a></li>
+<li><a href="#orge767640">4. Sphere forming spiral</a></li>
+<li><a href="#org0c1d6ba">5. Textured spherical spiral</a></li>
+<li><a href="#org41561dd">6. Textured and shaded spherical spiral</a></li>
+</ul>
+</div>
+</div>
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+
+<div id="outline-container-orga69a35d" class="outline-2">
+<h2 id="orga69a35d"><span class="section-number-2">1.</span> Spiral with increasing density</h2>
+<div class="outline-text-2" id="text-1">
+
+<div id="org9f588cc" class="figure">
+<p><img src="spiral.png" alt="spiral.png" class="responsive-img" />
+</p>
+</div>
+
+<p>
+From every point in the spiral, subdivided line is traced. Line
+segments are connected between the neighbors. Line segment count
+progressively increases towards the center.
+</p>
+
+<p>
+<a href="spiral.bas">spiral.bas</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> DrawLine (startX <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>, startY <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>, endX <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>, endY <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>, col <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>)
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Program to render fancy looking spiral.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024.08, Improved program readability</span>
+
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> lineVertexX(1 <span style="color: #bb99ee;">TO</span> 100) <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> lineVertexY(1 <span style="color: #bb99ee;">TO</span> 100) <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> depth <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> tempDepth <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+<span style="color: #ee8899;">SCREEN</span> 12
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Initialize the scale factor for the spiral</span>
+spiralScaleFactor = 200
+depth = 0
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate the spiral by iterating through angles and scaling appropriately</span>
+<span style="color: #bb99ee;">FOR</span> angle = 1 <span style="color: #bb99ee;">TO</span> 30 <span style="color: #bb99ee;">STEP</span> .1
+    <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the current scale based on the remaining distance to the center</span>
+    spiralScaleFactor = (30 - angle) * 7
+    <span style="color: #666677;">' </span><span style="color: #666677;">Convert polar coordinates to cartesian for the current point</span>
+    xPosition = <span style="color: #88aaee;">SIN</span>(angle) * spiralScaleFactor + 200
+    yPosition = <span style="color: #88aaee;">COS</span>(angle) * spiralScaleFactor + 200
+    <span style="color: #666677;">' </span><span style="color: #666677;">Store the current depth (z-axis value)</span>
+    tempDepth = angle
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw a line from the previous point to the current point with a color based on depth</span>
+    DrawLine xPosition + (xPosition / 2) + (angle * 3), (yPosition - (xPosition / 3)) + (angle * 3), xPosition + 25, yPosition + 25 - (angle * 3), depth
+    <span style="color: #666677;">' </span><span style="color: #666677;">Set the color for the next segment</span>
+    depth = 15
+<span style="color: #bb99ee;">NEXT</span> angle
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for user input to close the program</span>
+userInput$ = <span style="color: #88aaee;">INPUT$</span>(1)
+
+<span style="color: #bb99ee;">SUB</span> DrawLine (startX <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>, startY <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>, endX <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>, endY <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>, col <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>)
+    <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the step increments for x and y based on the depth</span>
+    deltaX = (endX - startX) / tempDepth
+    deltaY = (endY - startY) / tempDepth
+
+    <span style="color: #bb99ee;">FOR</span> segmentIndex = 1 <span style="color: #bb99ee;">TO</span> tempDepth
+        <span style="color: #666677;">' </span><span style="color: #666677;">If there is a previous vertex, draw a line to the new starting point</span>
+        <span style="color: #bb99ee;">IF</span> lineVertexX(segmentIndex) &gt; 0 <span style="color: #bb99ee;">THEN</span> <span style="color: #ee8899;">LINE</span> (lineVertexX(segmentIndex), lineVertexY(segmentIndex))-(startX, startY), col
+        <span style="color: #666677;">' </span><span style="color: #666677;">Store the current starting point as the next vertex</span>
+        lineVertexX(segmentIndex) = startX
+        lineVertexY(segmentIndex) = startY
+        <span style="color: #666677;">' </span><span style="color: #666677;">Increment the starting point by the calculated deltas</span>
+        startX = startX + deltaX
+        startY = startY + deltaY
+        <span style="color: #666677;">' </span><span style="color: #666677;">Draw a line from the stored vertex to the new starting point</span>
+        <span style="color: #ee8899;">LINE</span> (lineVertexX(segmentIndex), lineVertexY(segmentIndex))-(startX, startY), col
+    <span style="color: #bb99ee;">NEXT</span> segmentIndex
+<span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">SUB</span>
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org48ee846" class="outline-2">
+<h2 id="org48ee846"><span class="section-number-2">2.</span> Spiral with varying height</h2>
+<div class="outline-text-2" id="text-2">
+
+<div id="orgcabbf76" class="figure">
+<p><img src="spiral, 2.png" alt="spiral, 2.png" class="responsive-img" />
+</p>
+</div>
+
+<p>
+From every point in the spiral, subdivided line is traced. Line
+segments are connected between the neighbors. This creates effect
+where lines run from edges towards the center. Center is vertically
+displaced by sinus function where input is the distance to the center.
+</p>
+
+<p>
+<a href="spiral, 2.bas">spiral, 2.bas</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Program to render fancy looking spiral.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024.08, Improved program readability</span>
+
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralX(1 <span style="color: #bb99ee;">TO</span> 10000) <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">SINGLE</span> <span style="color: #666677;">' </span><span style="color: #666677;">X coordinates of the spiral points</span>
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralY(1 <span style="color: #bb99ee;">TO</span> 10000) <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">SINGLE</span> <span style="color: #666677;">' </span><span style="color: #666677;">Y coordinates of the spiral points</span>
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> pointCount <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span> <span style="color: #666677;">' </span><span style="color: #666677;">Total number of points plotted</span>
+<span style="color: #ee8899;">SCREEN</span> 12 <span style="color: #666677;">' </span><span style="color: #666677;">Set screen resolution to 640x480 with 16 colors</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Initialize the scale factor for the spiral</span>
+scaleFactor = 200
+pointCount = 0
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Calculate and plot each point on the spiral</span>
+<span style="color: #bb99ee;">FOR</span> angle = 1 <span style="color: #bb99ee;">TO</span> 100 <span style="color: #bb99ee;">STEP</span> .05
+    pointCount = pointCount + 1
+    scaleFactor = 100 - angle <span style="color: #666677;">' </span><span style="color: #666677;">Update the scaling factor as the loop progresses</span>
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the X and Y coordinates based on the sine and cosine of the angle</span>
+    spiralX(pointCount) = <span style="color: #88aaee;">SIN</span>(angle) * scaleFactor * 3 + 320
+    spiralY(pointCount) = <span style="color: #88aaee;">COS</span>(angle) * scaleFactor + 300
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Apply a vertical displacement to create a more dynamic effect</span>
+    spiralY(pointCount) = spiralY(pointCount) + (<span style="color: #88aaee;">SIN</span>((angle + 20) / 10) * angle)
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Plot the point on the screen</span>
+    <span style="color: #ee8899;">PSET</span> (spiralX(pointCount), spiralY(pointCount)), 15
+<span style="color: #bb99ee;">NEXT</span> angle
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Draw lines between points to create the spiral effect</span>
+<span style="color: #bb99ee;">FOR</span> segmentStart = 1 <span style="color: #bb99ee;">TO</span> pointCount - 125
+    <span style="color: #ee8899;">LINE</span> (spiralX(segmentStart), spiralY(segmentStart)) - _
+         (spiralX(segmentStart + 125), spiralY(segmentStart + 125)), 15
+<span style="color: #bb99ee;">NEXT</span> segmentStart
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for user input before exiting</span>
+a$ = <span style="color: #88aaee;">INPUT$</span>(1)
+<span style="color: #bb99ee;">END</span> <span style="color: #666677;">' </span><span style="color: #666677;">Exit the program</span>
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org4bb74ce" class="outline-2">
+<h2 id="org4bb74ce"><span class="section-number-2">3.</span> Shaded spiral</h2>
+<div class="outline-text-2" id="text-3">
+
+<div id="orga4b5761" class="figure">
+<p><img src="spiral, 3.png" alt="spiral, 3.png" class="responsive-img" />
+</p>
+</div>
+
+<p>
+Similar to previous spiral, Line segments are connected between the
+neighbors and sinus from the center decides vertical
+displacement. Attempt of shading is made where brighter areas have
+more detail.
+</p>
+
+<p>
+<a href="spiral, 3.bas">spiral, 3.bas</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Program to render fancy looking spiral with shaded surface.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024.08, Improved program readability</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Declare shared arrays for storing coordinates and sine values</span>
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralX(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralY(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> sineValue1(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> sineValue2(1 <span style="color: #bb99ee;">TO</span> 10000)
+
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Set the screen mode to 640x480 with 16 colors</span>
+<span style="color: #ee8899;">SCREEN</span> 12
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Initialize the spiral rotation parameter</span>
+<span style="color: #bb99ee;">DIM</span> spiralRotation <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">SINGLE</span>
+spiralRotation = 0
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate and draw the spiral points</span>
+<span style="color: #bb99ee;">FOR</span> angle = 0 <span style="color: #bb99ee;">TO</span> 150 <span style="color: #bb99ee;">STEP</span> .05
+    spiralRotation = spiralRotation + 1
+    scaleFactor = 150 - angle
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the X and Y coordinates for the current point</span>
+    spiralX(spiralRotation) = <span style="color: #88aaee;">SIN</span>(angle) * scaleFactor * 3 + 320
+    spiralY(spiralRotation) = <span style="color: #88aaee;">COS</span>(angle) * scaleFactor + 300
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Apply additional vertical displacement based on a secondary sine function</span>
+    spiralY(spiralRotation) = spiralY(spiralRotation) + (<span style="color: #88aaee;">SIN</span>((angle + 20) / 10) * (angle / 5 + 1))
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Store the current sine values for later use</span>
+    sineValue1(spiralRotation) = <span style="color: #88aaee;">SIN</span>(angle)
+    sineValue2(spiralRotation) = <span style="color: #88aaee;">SIN</span>((angle + 20) / 10)
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw the current point on the screen</span>
+    <span style="color: #ee8899;">PSET</span> (spiralX(spiralRotation), spiralY(spiralRotation)), 15
+<span style="color: #bb99ee;">NEXT</span> angle
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Connect the points to form a continuous line</span>
+<span style="color: #bb99ee;">FOR</span> index = 1 <span style="color: #bb99ee;">TO</span> spiralRotation - 127
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw a line segment between points 126 steps apart</span>
+    <span style="color: #ee8899;">LINE</span> (spiralX(index), spiralY(index))-(spiralX(index + 126), spiralY(index + 126)), 15
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Initialize the line drawing flag</span>
+    <span style="color: #bb99ee;">DIM</span> drawLine <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+    drawLine = 1
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Check conditions to determine if a line segment should be drawn</span>
+    <span style="color: #bb99ee;">IF</span> sineValue1(index) &gt; .8 <span style="color: #88aaee;">AND</span> sineValue2(index) &lt; sineValue2(index + 125) <span style="color: #bb99ee;">THEN</span> drawLine = 0
+    <span style="color: #bb99ee;">IF</span> sineValue1(index) &lt; -.2 <span style="color: #88aaee;">AND</span> (sineValue2(index) - .4) &gt; sineValue2(index + 125) <span style="color: #bb99ee;">THEN</span> drawLine = 0
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw a line segment if the conditions are met</span>
+    <span style="color: #bb99ee;">IF</span> drawLine = 1 <span style="color: #bb99ee;">THEN</span> <span style="color: #ee8899;">LINE</span> (spiralX(index), spiralY(index))-(spiralX(index + 1), spiralY(index + 1)), 15
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Reset the line drawing flag and check for different conditions</span>
+    drawLine = 0
+    <span style="color: #bb99ee;">IF</span> sineValue1(index) &gt; .8 <span style="color: #88aaee;">AND</span> sineValue2(index) &gt; sineValue2(index + 125) <span style="color: #bb99ee;">THEN</span> drawLine = 1
+    <span style="color: #bb99ee;">IF</span> sineValue1(index) &lt; -.2 <span style="color: #88aaee;">AND</span> sineValue2(index) &lt; sineValue2(index + 125) <span style="color: #bb99ee;">THEN</span> drawLine = 1
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw a line segment if the conditions are met</span>
+    <span style="color: #bb99ee;">IF</span> drawLine = 1 <span style="color: #bb99ee;">THEN</span> <span style="color: #ee8899;">LINE</span> (spiralX(index), spiralY(index))-(spiralX(index + 127), spiralY(index + 127)), 15
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Reset the line drawing flag and check for another set of conditions</span>
+    drawLine = 0
+    <span style="color: #bb99ee;">IF</span> sineValue1(index) &gt; .9 <span style="color: #88aaee;">AND</span> sineValue2(index) &gt; sineValue2(index + 125) <span style="color: #bb99ee;">THEN</span> drawLine = 1
+    <span style="color: #bb99ee;">IF</span> sineValue1(index) &lt; -.5 <span style="color: #88aaee;">AND</span> sineValue2(index) &lt; sineValue2(index + 125) <span style="color: #bb99ee;">THEN</span> drawLine = 1
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw a line segment if the conditions are met</span>
+    <span style="color: #bb99ee;">IF</span> drawLine = 1 <span style="color: #bb99ee;">THEN</span> <span style="color: #ee8899;">LINE</span> (spiralX(index), spiralY(index))-(spiralX(index + 125), spiralY(index + 125)), 15
+<span style="color: #bb99ee;">NEXT</span> index
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for a key press before exiting</span>
+a$ = <span style="color: #88aaee;">INPUT$</span>(1)
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-orge767640" class="outline-2">
+<h2 id="orge767640"><span class="section-number-2">4.</span> Sphere forming spiral</h2>
+<div class="outline-text-2" id="text-4">
+<p>
+Similar to previous spiral, Line segments are connected between the
+neighbors. Spiral height and width are calculated such that they form
+multiple linked spherical shapes. Initially point cloud in shown:
+</p>
+
+
+<div id="org912e61d" class="figure">
+<p><img src="spiral, 4, 1.png" alt="spiral, 4, 1.png" class="responsive-img" />
+</p>
+</div>
+
+<p>
+In the next step, points are connected using lines:
+</p>
+
+
+<div id="org827f8e8" class="figure">
+<p><img src="spiral, 4, 2.png" alt="spiral, 4, 2.png" class="responsive-img" />
+</p>
+</div>
+
+
+<p>
+<a href="spiral, 4.bas">spiral, 4.bas</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Program to render fancy looking spiral.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024.08, Improved program readability</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Declare shared arrays to hold the x and y coordinates of the spiral</span>
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralX(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralY(1 <span style="color: #bb99ee;">TO</span> 10000)
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Initialize the screen to a graphics mode with 640x480 resolution and 16 colors</span>
+<span style="color: #ee8899;">SCREEN</span> 12
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Constants for the initial size and the starting value of the index</span>
+<span style="color: #ee8899;">CONST</span> InitialSize = 100
+<span style="color: #ee8899;">CONST</span> StartIndex = 0
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Variable to keep track of the current position in the spiral arrays</span>
+<span style="color: #bb99ee;">DIM</span> torusIndex <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>
+torusIndex = StartIndex
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Loop parameters</span>
+<span style="color: #bb99ee;">DIM</span> angle <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>
+<span style="color: #bb99ee;">DIM</span> scaleFactor <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate the first arm of the spiral</span>
+<span style="color: #bb99ee;">FOR</span> angle = 0 <span style="color: #bb99ee;">TO</span> 97.35 <span style="color: #bb99ee;">STEP</span> .15
+    torusIndex = torusIndex + 1
+    scaleFactor = <span style="color: #88aaee;">SIN</span>(angle / 31) * InitialSize
+    spiralX(torusIndex) = <span style="color: #88aaee;">SIN</span>(angle) * scaleFactor * 3 + 320
+    spiralY(torusIndex) = <span style="color: #88aaee;">COS</span>(angle) * scaleFactor + 250
+    spiralY(torusIndex) = spiralY(torusIndex) - (<span style="color: #88aaee;">COS</span>(angle / 31) * 200)
+    <span style="color: #ee8899;">PSET</span> (spiralX(torusIndex), spiralY(torusIndex)), 15
+<span style="color: #bb99ee;">NEXT</span> angle
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate the second arm of the spiral</span>
+<span style="color: #bb99ee;">FOR</span> angle = 97.35 <span style="color: #bb99ee;">TO</span> 0 <span style="color: #bb99ee;">STEP</span> -.15
+    torusIndex = torusIndex + 1
+    scaleFactor = <span style="color: #88aaee;">SIN</span>(angle / 31) * (InitialSize / 2)
+    spiralX(torusIndex) = <span style="color: #88aaee;">SIN</span>(angle) * scaleFactor * 3 + 320
+    spiralY(torusIndex) = <span style="color: #88aaee;">COS</span>(angle) * scaleFactor + 350
+    spiralY(torusIndex) = spiralY(torusIndex) - (<span style="color: #88aaee;">COS</span>(angle / 31) * 100)
+    <span style="color: #ee8899;">PSET</span> (spiralX(torusIndex), spiralY(torusIndex)), 15
+<span style="color: #bb99ee;">NEXT</span> angle
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate the third arm of the spiral</span>
+<span style="color: #bb99ee;">FOR</span> angle = 0 <span style="color: #bb99ee;">TO</span> 97.35 <span style="color: #bb99ee;">STEP</span> .15
+    torusIndex = torusIndex + 1
+    scaleFactor = <span style="color: #88aaee;">SIN</span>(angle / 31) * (InitialSize / 4)
+    spiralX(torusIndex) = <span style="color: #88aaee;">SIN</span>(angle) * scaleFactor * 3 + 320
+    spiralY(torusIndex) = <span style="color: #88aaee;">COS</span>(angle) * scaleFactor + 300
+    spiralY(torusIndex) = spiralY(torusIndex) - (<span style="color: #88aaee;">COS</span>(angle / 31) * 50)
+    <span style="color: #ee8899;">PSET</span> (spiralX(torusIndex), spiralY(torusIndex)), 15
+<span style="color: #bb99ee;">NEXT</span> angle
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate the fourth arm of the spiral</span>
+<span style="color: #bb99ee;">FOR</span> angle = 97.35 <span style="color: #bb99ee;">TO</span> 0 <span style="color: #bb99ee;">STEP</span> -.15
+    torusIndex = torusIndex + 1
+    scaleFactor = <span style="color: #88aaee;">SIN</span>(angle / 31) * (InitialSize / 8)
+    spiralX(torusIndex) = <span style="color: #88aaee;">SIN</span>(angle) * scaleFactor * 3 + 320
+    spiralY(torusIndex) = <span style="color: #88aaee;">COS</span>(angle) * scaleFactor + 325
+    spiralY(torusIndex) = spiralY(torusIndex) - (<span style="color: #88aaee;">COS</span>(angle / 31) * 25)
+    <span style="color: #ee8899;">PSET</span> (spiralX(torusIndex), spiralY(torusIndex)), 15
+<span style="color: #bb99ee;">NEXT</span> angle
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Calculate the number of lines to draw based on the current index</span>
+<span style="color: #bb99ee;">DIM</span> totalSegments <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">DOUBLE</span>
+totalSegments = (torusIndex - 42) / 4
+
+a$ = <span style="color: #88aaee;">INPUT$</span>(1)
+<span style="color: #666677;">' </span><span style="color: #666677;">Clear the screen before drawing the lines</span>
+<span style="color: #ee8899;">CLS</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Draw the lines between points in the spiral</span>
+<span style="color: #bb99ee;">FOR</span> angle = 1 <span style="color: #bb99ee;">TO</span> totalSegments * 4
+    <span style="color: #ee8899;">LINE</span> (spiralX(angle), spiralY(angle))-(spiralX(angle + 42), spiralY(angle + 42)), 15
+    <span style="color: #ee8899;">LINE</span> (spiralX(angle), spiralY(angle))-(spiralX(angle + 1), spiralY(angle + 1)), 15
+<span style="color: #bb99ee;">NEXT</span> angle
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for the user to press a key before exiting</span>
+a$ = <span style="color: #88aaee;">INPUT$</span>(1)
+
+<span style="color: #666677;">' </span><span style="color: #666677;">End of program</span>
+<span style="color: #bb99ee;">SYSTEM</span>
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org0c1d6ba" class="outline-2">
+<h2 id="org0c1d6ba"><span class="section-number-2">5.</span> Textured spherical spiral</h2>
+<div class="outline-text-2" id="text-5">
+
+<div id="org2090eeb" class="figure">
+<p><img src="spiral, 5.png" alt="spiral, 5.png" class="responsive-img" />
+</p>
+</div>
+
+<p>
+Similar to previous spiral, Line segments are connected between the
+neighbors. Spiral height and width are calculated such that sphere is
+formed. Sphere is textured. Texture is loaded from file:
+<a href="texture.dat">texture.dat</a> .Invisible surface detection and removal is
+attempted.
+</p>
+
+<p>
+<a href="spiral, 5.bas">spiral, 5.bas</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Program to render fancy looking spiral.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024.08, Improved program readability</span>
+
+<span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> FillSegment (x1, y1, x2, y2, xx1, yy1, xx2, yy2)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralX(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralY(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> angles(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> phaseAngles(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> spiralLength
+<span style="color: #ee8899;">SCREEN</span> 12
+stepUnit = 200
+spiralLength = 0
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate the spiral points</span>
+<span style="color: #bb99ee;">FOR</span> angleIndex = 1 <span style="color: #bb99ee;">TO</span> 97 <span style="color: #bb99ee;">STEP</span> .15
+    spiralLength = spiralLength + 1
+    stepUnit = <span style="color: #88aaee;">SIN</span>(angleIndex / 31) * 100
+    xPos = <span style="color: #88aaee;">SIN</span>(angleIndex) * stepUnit * 3 + 320
+    yPos = <span style="color: #88aaee;">COS</span>(angleIndex) * stepUnit + 250
+    yPos = yPos - (<span style="color: #88aaee;">COS</span>(angleIndex / 31) * 200)
+    angles(spiralLength) = angleIndex
+    phaseAngles(spiralLength) = angleIndex / 31
+    spiralX(spiralLength) = xPos
+    spiralY(spiralLength) = yPos
+    <span style="color: #ee8899;">PSET</span> (xPos, yPos), 15
+<span style="color: #bb99ee;">NEXT</span> angleIndex
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Load texture data from file</span>
+<span style="color: #ee8899;">OPEN</span> <span style="color: #99dd99;">"texture.dat"</span> <span style="color: #bb99ee;">FOR</span> <span style="color: #ee8899;">INPUT</span> <span style="color: #bb99ee;">AS</span> #1
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> textureData$(1 <span style="color: #bb99ee;">TO</span> 1000)
+textureIndex = 0
+<span style="color: #eeaa77;">1</span>
+    <span style="color: #ee8899;">LINE</span> <span style="color: #ee8899;">INPUT</span> #1, textureLine$
+    <span style="color: #bb99ee;">IF</span> <span style="color: #88aaee;">LEFT$</span>(textureLine$, 3) = <span style="color: #99dd99;">"END"</span> <span style="color: #bb99ee;">THEN</span> <span style="color: #bb99ee;">GOTO</span> <span style="color: #eeaa77;">2</span>
+    textureIndex = textureIndex + 1
+    textureData$(textureIndex) = textureLine$
+<span style="color: #bb99ee;">GOTO</span> <span style="color: #eeaa77;">1</span>
+<span style="color: #eeaa77;">2</span>
+<span style="color: #ee8899;">CLS</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Apply texture to the spiral</span>
+textureIndex = 1
+<span style="color: #bb99ee;">FOR</span> charIndex = 1 <span style="color: #bb99ee;">TO</span> 20
+    <span style="color: #bb99ee;">FOR</span> textCharIndex = 1 <span style="color: #bb99ee;">TO</span> <span style="color: #88aaee;">LEN</span>(textureData$(charIndex))
+        textureChar$ = <span style="color: #88aaee;">RIGHT$</span>(<span style="color: #88aaee;">LEFT$</span>(textureData$(charIndex), textCharIndex), 1)
+        textureIndex = textureIndex + 1
+        <span style="color: #bb99ee;">IF</span> textureIndex &gt; spiralLength - 43 <span style="color: #bb99ee;">THEN</span> <span style="color: #bb99ee;">GOTO</span> DONE
+        teeVal = <span style="color: #88aaee;">SIN</span>(angles(textureIndex + 32)) - <span style="color: #88aaee;">COS</span>(phaseAngles(textureIndex))
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Draw lines if the condition is met</span>
+        <span style="color: #bb99ee;">IF</span> teeVal &lt;= 0 <span style="color: #bb99ee;">THEN</span>
+            <span style="color: #ee8899;">LINE</span> (spiralX(textureIndex), spiralY(textureIndex))-(spiralX(textureIndex + 1), spiralY(textureIndex + 1)), 15
+            <span style="color: #ee8899;">LINE</span> (spiralX(textureIndex), spiralY(textureIndex))-(spiralX(textureIndex + 42), spiralY(textureIndex + 42)), 15
+            <span style="color: #666677;">' </span><span style="color: #666677;">Fill the segment if the character matches</span>
+            <span style="color: #bb99ee;">IF</span> textureChar$ = <span style="color: #99dd99;">"M"</span> <span style="color: #bb99ee;">THEN</span>
+                <span style="color: #bb99ee;">CALL</span> FillSegment(spiralX(textureIndex), spiralY(textureIndex), spiralX(textureIndex + 1), spiralY(textureIndex + 1), spiralX(textureIndex + 42), spiralY(textureIndex + 42), spiralX(textureIndex + 43), spiralY(textureIndex + 43))
+            <span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">IF</span>
+        <span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">IF</span>
+    <span style="color: #bb99ee;">NEXT</span> textCharIndex
+<span style="color: #bb99ee;">NEXT</span> charIndex
+<span style="color: #eeaa77;">DONE:</span>
+a$ = <span style="color: #88aaee;">INPUT$</span>(1)
+<span style="color: #bb99ee;">SYSTEM</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Subroutine to fill a segment with lines</span>
+<span style="color: #bb99ee;">SUB</span> FillSegment (x1, y1, x2, y2, xx1, yy1, xx2, yy2)
+    <span style="color: #666677;">' </span><span style="color: #666677;">Assign input parameters to local variables</span>
+    xStart = x1
+    yStart = y1
+    xEnd = x2
+    yEnd = y2
+    xxStart = xx1
+    yyStart = yy1
+    xxEnd = xx2
+    yyEnd = yy2
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Calculate step increments</span>
+    j = 10
+    xStep = (xEnd - xStart) / j
+    yStep = (yEnd - yStart) / j
+    xxStep = (xxEnd - xxStart) / j
+    yyStep = (yyEnd - yyStart) / j
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw lines between the points</span>
+    <span style="color: #bb99ee;">FOR</span> a = 1 <span style="color: #bb99ee;">TO</span> j
+        xStart = xStart + xStep
+        yStart = yStart + yStep
+        xxStart = xxStart + xxStep
+        yyStart = yyStart + yyStep
+        <span style="color: #ee8899;">LINE</span> (xStart, yStart)-(xxStart, yyStart), 15
+    <span style="color: #bb99ee;">NEXT</span> a
+<span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">SUB</span>
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org41561dd" class="outline-2">
+<h2 id="org41561dd"><span class="section-number-2">6.</span> Textured and shaded spherical spiral</h2>
+<div class="outline-text-2" id="text-6">
+
+<div id="org2163199" class="figure">
+<p><img src="spiral, 6.png" alt="spiral, 6.png" class="responsive-img" />
+</p>
+</div>
+
+<p>
+Similar to previous spiral, Line segments are connected between the
+neighbors. Spiral height and width are calculated such that sphere is
+formed. Sphere is textured. Texture is loaded from file:
+<a href="texture1.dat">texture1.dat</a> . Invisible surface detection and removal is
+attempted. Sphere is shaded.
+</p>
+
+<p>
+<a href="spiral, 6.bas">spiral, 6.bas</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Program to render fancy looking textured and shaded spiral.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Texture is loaded from file.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024 - 2025, Improved program readability</span>
+
+<span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> fill(x1, y1, x2, y2, xx1, yy1, xx2, yy2, hel)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> torux(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> toruy(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> sin1(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> cos1(1 <span style="color: #bb99ee;">TO</span> 10000)
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> tor
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Set the screen mode to 12</span>
+<span style="color: #ee8899;">SCREEN</span> 12
+su = 200
+tor = 0
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Calculate points for the spiral</span>
+<span style="color: #bb99ee;">FOR</span> a = 1 <span style="color: #bb99ee;">TO</span> 97 <span style="color: #bb99ee;">STEP</span> .15
+    tor = tor + 1
+    su = <span style="color: #88aaee;">SIN</span>(a / 31) * 100
+    x = <span style="color: #88aaee;">SIN</span>(a) * su * 3 + 320
+    y = <span style="color: #88aaee;">COS</span>(a) * su + 250
+    y = y - (<span style="color: #88aaee;">COS</span>(a / 31) * 200)
+    sin1(tor) = a
+    cos1(tor) = a / 31
+    torux(tor) = x
+    toruy(tor) = y
+    <span style="color: #666677;">' </span><span style="color: #666677;">Set the pixel at (x, y) to color 15</span>
+    <span style="color: #ee8899;">PSET</span> (x, y), 15
+<span style="color: #bb99ee;">NEXT</span> a
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Open the text file for input</span>
+<span style="color: #ee8899;">OPEN</span> <span style="color: #99dd99;">"texture1.dat"</span> <span style="color: #bb99ee;">FOR</span> <span style="color: #ee8899;">INPUT</span> <span style="color: #bb99ee;">AS</span> #1
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> text$(1 <span style="color: #bb99ee;">TO</span> 1000)
+
+a = 0
+<span style="color: #eeaa77;">1</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Read a line from the file</span>
+<span style="color: #ee8899;">LINE</span> <span style="color: #ee8899;">INPUT</span> #1, a$
+<span style="color: #666677;">' </span><span style="color: #666677;">Check if the line is the end marker</span>
+<span style="color: #bb99ee;">IF</span> <span style="color: #88aaee;">LEFT$</span>(a$, 3) = <span style="color: #99dd99;">"END"</span> <span style="color: #bb99ee;">THEN</span> <span style="color: #bb99ee;">GOTO</span> <span style="color: #eeaa77;">2</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Increment the counter and store the line in the text array</span>
+a = a + 1
+text$(a) = a$
+<span style="color: #bb99ee;">GOTO</span> <span style="color: #eeaa77;">1</span>
+<span style="color: #eeaa77;">2</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Close the file</span>
+<span style="color: #ee8899;">CLOSE</span> #1
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Clear the screen</span>
+<span style="color: #ee8899;">CLS</span>
+a = 1
+<span style="color: #666677;">' </span><span style="color: #666677;">Loop through each character in the text</span>
+<span style="color: #bb99ee;">FOR</span> c = 1 <span style="color: #bb99ee;">TO</span> 20
+    <span style="color: #bb99ee;">FOR</span> b = 1 <span style="color: #bb99ee;">TO</span> <span style="color: #88aaee;">LEN</span>(text$(c))
+        <span style="color: #666677;">' </span><span style="color: #666677;">Get the current character</span>
+        a$ = <span style="color: #88aaee;">RIGHT$</span>(<span style="color: #88aaee;">LEFT$</span>(text$(c), b), 1)
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Increment the counter</span>
+        a = a + 1
+        <span style="color: #666677;">' </span><span style="color: #666677;">Check if we have reached the end of the points array</span>
+        <span style="color: #bb99ee;">IF</span> a &gt; tor - 43 <span style="color: #bb99ee;">THEN</span> <span style="color: #bb99ee;">GOTO</span> <span style="color: #eeaa77;">3</span>
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the angle for the current point</span>
+        tee = <span style="color: #88aaee;">SIN</span>(sin1(a + 32))
+        tee = tee - <span style="color: #88aaee;">COS</span>(cos1(a))
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Draw lines based on the calculated angle</span>
+        <span style="color: #bb99ee;">IF</span> tee &lt;= 0 <span style="color: #bb99ee;">THEN</span>
+            <span style="color: #ee8899;">LINE</span> (torux(a), toruy(a))-(torux(a + 1), toruy(a + 1)), 15
+            <span style="color: #ee8899;">LINE</span> (torux(a), toruy(a))-(torux(a + 42), toruy(a + 42)), 15
+            hel = 10
+            hel1 = <span style="color: #88aaee;">COS</span>(cos1(a) - 1) + .5
+            hel2 = <span style="color: #88aaee;">SIN</span>(sin1(a) + 1) + 1
+            <span style="color: #666677;">' </span><span style="color: #666677;">Adjust brightness based on the angles</span>
+            <span style="color: #bb99ee;">IF</span> hel2 &gt; 1 <span style="color: #88aaee;">AND</span> hel1 &gt; 1 <span style="color: #bb99ee;">THEN</span>
+                hel3 = (hel2 - 1) * (hel1 - 1) * 8
+                hel = hel / (hel3 + 1)
+            <span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">IF</span>
+
+            <span style="color: #666677;">' </span><span style="color: #666677;">Adjust brightness if the character is "M"</span>
+            <span style="color: #bb99ee;">IF</span> a$ = <span style="color: #99dd99;">"M"</span> <span style="color: #bb99ee;">THEN</span> hel = hel / 3
+
+            <span style="color: #666677;">' </span><span style="color: #666677;">Fill the shape with the calculated brightness</span>
+            fillQuadrilateralWithShading torux(a), toruy(a), torux(a + 1), toruy(a + 1), torux(a + 42), toruy(a + 42), torux(a + 43), toruy(a + 43), hel
+        <span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">IF</span>
+    <span style="color: #bb99ee;">NEXT</span> b
+<span style="color: #bb99ee;">NEXT</span> c
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for user input</span>
+<span style="color: #eeaa77;">3</span>
+a$ = <span style="color: #88aaee;">INPUT$</span>(1)
+<span style="color: #bb99ee;">SYSTEM</span>
+
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Fills a quadrilateral area using scanline algorithm with variable density</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Creates shaded surface effect by interpolating between opposite edges</span>
+<span style="color: #666677;">'</span>
+<span style="color: #bb99ee;">SUB</span> fillQuadrilateralWithShading (startEdgePointX1, startEdgePointY1, endEdgePointX1, endEdgePointY1, shiftedStartEdgeX1, shiftedStarEdgeY1, shiftedEndEdgeX1, shiftEndEdgeY1, brightnessFactor)
+
+<span style="color: #666677;">' </span><span style="color: #666677;">This subroutine creates the illusion of a shaded surface by drawing multiple lines</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">between two opposite edges of a quadrilateral. The density of these lines is</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">controlled by the brightnessFactor parameter - higher values produce sparser lines.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Parameters:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">startEdgePointX1/Y1 and endEdgePointX1/Y1 define one pair of points forming an edge</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">shiftedStartEdgeX1/Y1 and shiftedEndEdgeX1/Y1 define the opposite edge</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">brightnessFactor controls how densely packed the lines will be drawn</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Local variables for working with point coordinates</span>
+edgePointX1 = startEdgePointX1
+edgePointY1 = startEdgePointY1
+edgePointX2 = endEdgePointX1
+edgePointY2 = endEdgePointY1
+oppositePointX1 = shiftedStartEdgeX1
+oppositePointY1 = shiftedStarEdgeY1
+oppositePointX2 = shiftedEndEdgeX1
+oppositePointY2 = shiftEndEdgeY1
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Calculate distance differences along first edge</span>
+deltaX1 = edgePointX1 - edgePointX2
+deltaY1 = edgePointY1 - edgePointY2
+length1 = <span style="color: #88aaee;">SQR</span>((deltaX1 * deltaX1) + (deltaY1 * deltaY1))
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Calculate distance differences along second edge</span>
+deltaX2 = oppositePointX1 - oppositePointX2
+deltaY2 = oppositePointY1 - oppositePointY2
+length2 = <span style="color: #88aaee;">SQR</span>((deltaX2 * deltaX2) + (deltaY2 * deltaY2))
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Average length determines number of steps based on brightness factor</span>
+averageLength = (length1 + length2) / 2
+stepCount = averageLength / brightnessFactor
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Calculate step increments for each axis</span>
+xStep1 = (edgePointX2 - edgePointX1) / stepCount
+yStep1 = (edgePointY2 - edgePointY1) / stepCount
+xStep2 = (oppositePointX2 - oppositePointX1) / stepCount
+yStep2 = (oppositePointY2 - oppositePointY1) / stepCount
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Draw intermediate connecting lines across the shape</span>
+<span style="color: #bb99ee;">FOR</span> stepIndex = 1 <span style="color: #bb99ee;">TO</span> stepCount
+    edgePointX1 = edgePointX1 + xStep1
+    edgePointY1 = edgePointY1 + yStep1
+    oppositePointX1 = oppositePointX1 + xStep2
+    oppositePointY1 = oppositePointY1 + yStep2
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw line between current interpolated points</span>
+    <span style="color: #ee8899;">LINE</span> (edgePointX1, edgePointY1)-(oppositePointX1, oppositePointY1), 15
+<span style="color: #bb99ee;">NEXT</span> stepIndex
+
+<span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">SUB</span>
+</pre>
+</div>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2025-07-28 ma 03:32</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/2D GFX/Spirals/index.org b/2D GFX/Spirals/index.org
new file mode 100644
index 0000000..cffa9dd
--- /dev/null
+++ b/2D GFX/Spirals/index.org	
@@ -0,0 +1,124 @@
+#+TITLE: Spiral series
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+#+begin_export html
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+#+end_export
+
+* Spiral with increasing density
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:spiral.png]]
+
+From every point in the spiral, subdivided line is traced. Line
+segments are connected between the neighbors. Line segment count
+progressively increases towards the center.
+
+[[file:spiral.bas]]
+
+#+INCLUDE: "spiral.bas" src basic-qb45
+
+* Spiral with varying height
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:spiral, 2.png]]
+
+From every point in the spiral, subdivided line is traced. Line
+segments are connected between the neighbors. This creates effect
+where lines run from edges towards the center. Center is vertically
+displaced by sinus function where input is the distance to the center.
+
+[[file:spiral, 2.bas]]
+
+#+INCLUDE: "spiral, 2.bas" src basic-qb45
+
+* Shaded spiral
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 800px
+[[file:spiral, 3.png]]
+
+Similar to previous spiral, Line segments are connected between the
+neighbors and sinus from the center decides vertical
+displacement. Attempt of shading is made where brighter areas have
+more detail.
+
+[[file:spiral, 3.bas]]
+
+#+INCLUDE: "spiral, 3.bas" src basic-qb45
+
+* Sphere forming spiral
+
+Similar to previous spiral, Line segments are connected between the
+neighbors. Spiral height and width are calculated such that they form
+multiple linked spherical shapes. Initially point cloud in shown:
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:spiral, 4, 1.png]]
+
+In the next step, points are connected using lines:
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:spiral, 4, 2.png]]
+
+
+[[file:spiral, 4.bas]]
+
+#+INCLUDE: "spiral, 4.bas" src basic-qb45
+
+* Textured spherical spiral
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:spiral, 5.png]]
+
+Similar to previous spiral, Line segments are connected between the
+neighbors. Spiral height and width are calculated such that sphere is
+formed. Sphere is textured. Texture is loaded from file:
+[[file:texture.dat]] .Invisible surface detection and removal is
+attempted.
+
+[[file:spiral, 5.bas]]
+
+#+INCLUDE: "spiral, 5.bas" src basic-qb45
+
+* Textured and shaded spherical spiral
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:spiral, 6.png]]
+
+Similar to previous spiral, Line segments are connected between the
+neighbors. Spiral height and width are calculated such that sphere is
+formed. Sphere is textured. Texture is loaded from file:
+[[file:texture1.dat]] . Invisible surface detection and removal is
+attempted. Sphere is shaded.
+
+[[file:spiral, 6.bas]]
+
+#+INCLUDE: "spiral, 6.bas" src basic-qb45
diff --git a/2D GFX/Spirals/logo.png b/2D GFX/Spirals/logo.png
new file mode 100644
index 0000000..a82b2e1
Binary files /dev/null and b/2D GFX/Spirals/logo.png differ
diff --git a/2D GFX/Spirals/spiral, 2.bas b/2D GFX/Spirals/spiral, 2.bas
new file mode 100644
index 0000000..3c1be67
--- /dev/null
+++ b/2D GFX/Spirals/spiral, 2.bas	
@@ -0,0 +1,45 @@
+' Program to render fancy looking spiral.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+DIM SHARED spiralX(1 TO 10000) AS SINGLE ' X coordinates of the spiral points
+DIM SHARED spiralY(1 TO 10000) AS SINGLE ' Y coordinates of the spiral points
+DIM SHARED pointCount AS INTEGER ' Total number of points plotted
+SCREEN 12 ' Set screen resolution to 640x480 with 16 colors
+
+' Initialize the scale factor for the spiral
+scaleFactor = 200
+pointCount = 0
+
+' Calculate and plot each point on the spiral
+FOR angle = 1 TO 100 STEP .05
+    pointCount = pointCount + 1
+    scaleFactor = 100 - angle ' Update the scaling factor as the loop progresses
+
+    ' Calculate the X and Y coordinates based on the sine and cosine of the angle
+    spiralX(pointCount) = SIN(angle) * scaleFactor * 3 + 320
+    spiralY(pointCount) = COS(angle) * scaleFactor + 300
+
+    ' Apply a vertical displacement to create a more dynamic effect
+    spiralY(pointCount) = spiralY(pointCount) + (SIN((angle + 20) / 10) * angle)
+
+    ' Plot the point on the screen
+    PSET (spiralX(pointCount), spiralY(pointCount)), 15
+NEXT angle
+
+' Draw lines between points to create the spiral effect
+FOR segmentStart = 1 TO pointCount - 125
+    LINE (spiralX(segmentStart), spiralY(segmentStart)) - _
+         (spiralX(segmentStart + 125), spiralY(segmentStart + 125)), 15
+NEXT segmentStart
+
+' Wait for user input before exiting
+a$ = INPUT$(1)
+END ' Exit the program
diff --git a/2D GFX/Spirals/spiral, 2.png b/2D GFX/Spirals/spiral, 2.png
new file mode 100644
index 0000000..2534319
Binary files /dev/null and b/2D GFX/Spirals/spiral, 2.png differ
diff --git a/2D GFX/Spirals/spiral, 3.bas b/2D GFX/Spirals/spiral, 3.bas
new file mode 100644
index 0000000..8c875a8
--- /dev/null
+++ b/2D GFX/Spirals/spiral, 3.bas	
@@ -0,0 +1,81 @@
+' Program to render fancy looking spiral with shaded surface.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+' Declare shared arrays for storing coordinates and sine values
+DIM SHARED spiralX(1 TO 10000)
+DIM SHARED spiralY(1 TO 10000)
+DIM SHARED sineValue1(1 TO 10000)
+DIM SHARED sineValue2(1 TO 10000)
+
+
+' Set the screen mode to 640x480 with 16 colors
+SCREEN 12
+
+' Initialize the spiral rotation parameter
+DIM spiralRotation AS SINGLE
+spiralRotation = 0
+
+' Generate and draw the spiral points
+FOR angle = 0 TO 150 STEP .05
+    spiralRotation = spiralRotation + 1
+    scaleFactor = 150 - angle
+
+    ' Calculate the X and Y coordinates for the current point
+    spiralX(spiralRotation) = SIN(angle) * scaleFactor * 3 + 320
+    spiralY(spiralRotation) = COS(angle) * scaleFactor + 300
+
+    ' Apply additional vertical displacement based on a secondary sine function
+    spiralY(spiralRotation) = spiralY(spiralRotation) + (SIN((angle + 20) / 10) * (angle / 5 + 1))
+
+    ' Store the current sine values for later use
+    sineValue1(spiralRotation) = SIN(angle)
+    sineValue2(spiralRotation) = SIN((angle + 20) / 10)
+
+    ' Draw the current point on the screen
+    PSET (spiralX(spiralRotation), spiralY(spiralRotation)), 15
+NEXT angle
+
+' Connect the points to form a continuous line
+FOR index = 1 TO spiralRotation - 127
+    ' Draw a line segment between points 126 steps apart
+    LINE (spiralX(index), spiralY(index))-(spiralX(index + 126), spiralY(index + 126)), 15
+
+    ' Initialize the line drawing flag
+    DIM drawLine AS INTEGER
+    drawLine = 1
+
+    ' Check conditions to determine if a line segment should be drawn
+    IF sineValue1(index) > .8 AND sineValue2(index) < sineValue2(index + 125) THEN drawLine = 0
+    IF sineValue1(index) < -.2 AND (sineValue2(index) - .4) > sineValue2(index + 125) THEN drawLine = 0
+
+    ' Draw a line segment if the conditions are met
+    IF drawLine = 1 THEN LINE (spiralX(index), spiralY(index))-(spiralX(index + 1), spiralY(index + 1)), 15
+
+    ' Reset the line drawing flag and check for different conditions
+    drawLine = 0
+    IF sineValue1(index) > .8 AND sineValue2(index) > sineValue2(index + 125) THEN drawLine = 1
+    IF sineValue1(index) < -.2 AND sineValue2(index) < sineValue2(index + 125) THEN drawLine = 1
+
+    ' Draw a line segment if the conditions are met
+    IF drawLine = 1 THEN LINE (spiralX(index), spiralY(index))-(spiralX(index + 127), spiralY(index + 127)), 15
+
+    ' Reset the line drawing flag and check for another set of conditions
+    drawLine = 0
+    IF sineValue1(index) > .9 AND sineValue2(index) > sineValue2(index + 125) THEN drawLine = 1
+    IF sineValue1(index) < -.5 AND sineValue2(index) < sineValue2(index + 125) THEN drawLine = 1
+
+    ' Draw a line segment if the conditions are met
+    IF drawLine = 1 THEN LINE (spiralX(index), spiralY(index))-(spiralX(index + 125), spiralY(index + 125)), 15
+NEXT index
+
+' Wait for a key press before exiting
+a$ = INPUT$(1)
+
diff --git a/2D GFX/Spirals/spiral, 3.png b/2D GFX/Spirals/spiral, 3.png
new file mode 100644
index 0000000..fba0323
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diff --git a/2D GFX/Spirals/spiral, 4, 1.png b/2D GFX/Spirals/spiral, 4, 1.png
new file mode 100644
index 0000000..caa29b1
Binary files /dev/null and b/2D GFX/Spirals/spiral, 4, 1.png differ
diff --git a/2D GFX/Spirals/spiral, 4, 2.png b/2D GFX/Spirals/spiral, 4, 2.png
new file mode 100644
index 0000000..76ff118
Binary files /dev/null and b/2D GFX/Spirals/spiral, 4, 2.png differ
diff --git a/2D GFX/Spirals/spiral, 4.bas b/2D GFX/Spirals/spiral, 4.bas
new file mode 100644
index 0000000..5101083
--- /dev/null
+++ b/2D GFX/Spirals/spiral, 4.bas	
@@ -0,0 +1,90 @@
+' Program to render fancy looking spiral.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+' Declare shared arrays to hold the x and y coordinates of the spiral
+DIM SHARED spiralX(1 TO 10000)
+DIM SHARED spiralY(1 TO 10000)
+
+' Initialize the screen to a graphics mode with 640x480 resolution and 16 colors
+SCREEN 12
+
+' Constants for the initial size and the starting value of the index
+CONST InitialSize = 100
+CONST StartIndex = 0
+
+' Variable to keep track of the current position in the spiral arrays
+DIM torusIndex AS DOUBLE
+torusIndex = StartIndex
+
+' Loop parameters
+DIM angle AS DOUBLE
+DIM scaleFactor AS DOUBLE
+
+' Generate the first arm of the spiral
+FOR angle = 0 TO 97.35 STEP .15
+    torusIndex = torusIndex + 1
+    scaleFactor = SIN(angle / 31) * InitialSize
+    spiralX(torusIndex) = SIN(angle) * scaleFactor * 3 + 320
+    spiralY(torusIndex) = COS(angle) * scaleFactor + 250
+    spiralY(torusIndex) = spiralY(torusIndex) - (COS(angle / 31) * 200)
+    PSET (spiralX(torusIndex), spiralY(torusIndex)), 15
+NEXT angle
+
+' Generate the second arm of the spiral
+FOR angle = 97.35 TO 0 STEP -.15
+    torusIndex = torusIndex + 1
+    scaleFactor = SIN(angle / 31) * (InitialSize / 2)
+    spiralX(torusIndex) = SIN(angle) * scaleFactor * 3 + 320
+    spiralY(torusIndex) = COS(angle) * scaleFactor + 350
+    spiralY(torusIndex) = spiralY(torusIndex) - (COS(angle / 31) * 100)
+    PSET (spiralX(torusIndex), spiralY(torusIndex)), 15
+NEXT angle
+
+' Generate the third arm of the spiral
+FOR angle = 0 TO 97.35 STEP .15
+    torusIndex = torusIndex + 1
+    scaleFactor = SIN(angle / 31) * (InitialSize / 4)
+    spiralX(torusIndex) = SIN(angle) * scaleFactor * 3 + 320
+    spiralY(torusIndex) = COS(angle) * scaleFactor + 300
+    spiralY(torusIndex) = spiralY(torusIndex) - (COS(angle / 31) * 50)
+    PSET (spiralX(torusIndex), spiralY(torusIndex)), 15
+NEXT angle
+
+' Generate the fourth arm of the spiral
+FOR angle = 97.35 TO 0 STEP -.15
+    torusIndex = torusIndex + 1
+    scaleFactor = SIN(angle / 31) * (InitialSize / 8)
+    spiralX(torusIndex) = SIN(angle) * scaleFactor * 3 + 320
+    spiralY(torusIndex) = COS(angle) * scaleFactor + 325
+    spiralY(torusIndex) = spiralY(torusIndex) - (COS(angle / 31) * 25)
+    PSET (spiralX(torusIndex), spiralY(torusIndex)), 15
+NEXT angle
+
+' Calculate the number of lines to draw based on the current index
+DIM totalSegments AS DOUBLE
+totalSegments = (torusIndex - 42) / 4
+
+a$ = INPUT$(1)
+' Clear the screen before drawing the lines
+CLS
+
+' Draw the lines between points in the spiral
+FOR angle = 1 TO totalSegments * 4
+    LINE (spiralX(angle), spiralY(angle))-(spiralX(angle + 42), spiralY(angle + 42)), 15
+    LINE (spiralX(angle), spiralY(angle))-(spiralX(angle + 1), spiralY(angle + 1)), 15
+NEXT angle
+
+' Wait for the user to press a key before exiting
+a$ = INPUT$(1)
+
+' End of program
+SYSTEM
+
diff --git a/2D GFX/Spirals/spiral, 5.bas b/2D GFX/Spirals/spiral, 5.bas
new file mode 100644
index 0000000..80b03e5
--- /dev/null
+++ b/2D GFX/Spirals/spiral, 5.bas	
@@ -0,0 +1,101 @@
+' Program to render fancy looking spiral.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+DECLARE SUB FillSegment (x1, y1, x2, y2, xx1, yy1, xx2, yy2)
+DIM SHARED spiralX(1 TO 10000)
+DIM SHARED spiralY(1 TO 10000)
+DIM SHARED angles(1 TO 10000)
+DIM SHARED phaseAngles(1 TO 10000)
+DIM SHARED spiralLength
+SCREEN 12
+stepUnit = 200
+spiralLength = 0
+
+' Generate the spiral points
+FOR angleIndex = 1 TO 97 STEP .15
+    spiralLength = spiralLength + 1
+    stepUnit = SIN(angleIndex / 31) * 100
+    xPos = SIN(angleIndex) * stepUnit * 3 + 320
+    yPos = COS(angleIndex) * stepUnit + 250
+    yPos = yPos - (COS(angleIndex / 31) * 200)
+    angles(spiralLength) = angleIndex
+    phaseAngles(spiralLength) = angleIndex / 31
+    spiralX(spiralLength) = xPos
+    spiralY(spiralLength) = yPos
+    PSET (xPos, yPos), 15
+NEXT angleIndex
+
+' Load texture data from file
+OPEN "texture.dat" FOR INPUT AS #1
+DIM SHARED textureData$(1 TO 1000)
+textureIndex = 0
+1
+    LINE INPUT #1, textureLine$
+    IF LEFT$(textureLine$, 3) = "END" THEN GOTO 2
+    textureIndex = textureIndex + 1
+    textureData$(textureIndex) = textureLine$
+GOTO 1
+2
+CLS
+
+' Apply texture to the spiral
+textureIndex = 1
+FOR charIndex = 1 TO 20
+    FOR textCharIndex = 1 TO LEN(textureData$(charIndex))
+        textureChar$ = RIGHT$(LEFT$(textureData$(charIndex), textCharIndex), 1)
+        textureIndex = textureIndex + 1
+        IF textureIndex > spiralLength - 43 THEN GOTO DONE
+        teeVal = SIN(angles(textureIndex + 32)) - COS(phaseAngles(textureIndex))
+
+        ' Draw lines if the condition is met
+        IF teeVal <= 0 THEN
+            LINE (spiralX(textureIndex), spiralY(textureIndex))-(spiralX(textureIndex + 1), spiralY(textureIndex + 1)), 15
+            LINE (spiralX(textureIndex), spiralY(textureIndex))-(spiralX(textureIndex + 42), spiralY(textureIndex + 42)), 15
+            ' Fill the segment if the character matches
+            IF textureChar$ = "M" THEN
+                CALL FillSegment(spiralX(textureIndex), spiralY(textureIndex), spiralX(textureIndex + 1), spiralY(textureIndex + 1), spiralX(textureIndex + 42), spiralY(textureIndex + 42), spiralX(textureIndex + 43), spiralY(textureIndex + 43))
+            END IF
+        END IF
+    NEXT textCharIndex
+NEXT charIndex
+DONE:
+a$ = INPUT$(1)
+SYSTEM
+
+' Subroutine to fill a segment with lines
+SUB FillSegment (x1, y1, x2, y2, xx1, yy1, xx2, yy2)
+    ' Assign input parameters to local variables
+    xStart = x1
+    yStart = y1
+    xEnd = x2
+    yEnd = y2
+    xxStart = xx1
+    yyStart = yy1
+    xxEnd = xx2
+    yyEnd = yy2
+
+    ' Calculate step increments
+    j = 10
+    xStep = (xEnd - xStart) / j
+    yStep = (yEnd - yStart) / j
+    xxStep = (xxEnd - xxStart) / j
+    yyStep = (yyEnd - yyStart) / j
+
+    ' Draw lines between the points
+    FOR a = 1 TO j
+        xStart = xStart + xStep
+        yStart = yStart + yStep
+        xxStart = xxStart + xxStep
+        yyStart = yyStart + yyStep
+        LINE (xStart, yStart)-(xxStart, yyStart), 15
+    NEXT a
+END SUB
+
diff --git a/2D GFX/Spirals/spiral, 5.png b/2D GFX/Spirals/spiral, 5.png
new file mode 100644
index 0000000..552f480
Binary files /dev/null and b/2D GFX/Spirals/spiral, 5.png differ
diff --git a/2D GFX/Spirals/spiral, 6.bas b/2D GFX/Spirals/spiral, 6.bas
new file mode 100644
index 0000000..03190e0
--- /dev/null
+++ b/2D GFX/Spirals/spiral, 6.bas	
@@ -0,0 +1,160 @@
+' Program to render fancy looking textured and shaded spiral.
+' Texture is loaded from file.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024 - 2025, Improved program readability
+
+DECLARE SUB fill(x1, y1, x2, y2, xx1, yy1, xx2, yy2, hel)
+DIM SHARED torux(1 TO 10000)
+DIM SHARED toruy(1 TO 10000)
+DIM SHARED sin1(1 TO 10000)
+DIM SHARED cos1(1 TO 10000)
+DIM SHARED tor
+
+' Set the screen mode to 12
+SCREEN 12
+su = 200
+tor = 0
+
+' Calculate points for the spiral
+FOR a = 1 TO 97 STEP .15
+    tor = tor + 1
+    su = SIN(a / 31) * 100
+    x = SIN(a) * su * 3 + 320
+    y = COS(a) * su + 250
+    y = y - (COS(a / 31) * 200)
+    sin1(tor) = a
+    cos1(tor) = a / 31
+    torux(tor) = x
+    toruy(tor) = y
+    ' Set the pixel at (x, y) to color 15
+    PSET (x, y), 15
+NEXT a
+
+' Open the text file for input
+OPEN "texture1.dat" FOR INPUT AS #1
+DIM SHARED text$(1 TO 1000)
+
+a = 0
+1
+' Read a line from the file
+LINE INPUT #1, a$
+' Check if the line is the end marker
+IF LEFT$(a$, 3) = "END" THEN GOTO 2
+
+' Increment the counter and store the line in the text array
+a = a + 1
+text$(a) = a$
+GOTO 1
+2
+' Close the file
+CLOSE #1
+
+' Clear the screen
+CLS
+a = 1
+' Loop through each character in the text
+FOR c = 1 TO 20
+    FOR b = 1 TO LEN(text$(c))
+        ' Get the current character
+        a$ = RIGHT$(LEFT$(text$(c), b), 1)
+
+        ' Increment the counter
+        a = a + 1
+        ' Check if we have reached the end of the points array
+        IF a > tor - 43 THEN GOTO 3
+
+        ' Calculate the angle for the current point
+        tee = SIN(sin1(a + 32))
+        tee = tee - COS(cos1(a))
+
+        ' Draw lines based on the calculated angle
+        IF tee <= 0 THEN
+            LINE (torux(a), toruy(a))-(torux(a + 1), toruy(a + 1)), 15
+            LINE (torux(a), toruy(a))-(torux(a + 42), toruy(a + 42)), 15
+            hel = 10
+            hel1 = COS(cos1(a) - 1) + .5
+            hel2 = SIN(sin1(a) + 1) + 1
+            ' Adjust brightness based on the angles
+            IF hel2 > 1 AND hel1 > 1 THEN
+                hel3 = (hel2 - 1) * (hel1 - 1) * 8
+                hel = hel / (hel3 + 1)
+            END IF
+
+            ' Adjust brightness if the character is "M"
+            IF a$ = "M" THEN hel = hel / 3
+
+            ' Fill the shape with the calculated brightness
+            fillQuadrilateralWithShading torux(a), toruy(a), torux(a + 1), toruy(a + 1), torux(a + 42), toruy(a + 42), torux(a + 43), toruy(a + 43), hel
+        END IF
+    NEXT b
+NEXT c
+
+' Wait for user input
+3
+a$ = INPUT$(1)
+SYSTEM
+
+'
+' Fills a quadrilateral area using scanline algorithm with variable density
+' Creates shaded surface effect by interpolating between opposite edges
+'
+SUB fillQuadrilateralWithShading (startEdgePointX1, startEdgePointY1, endEdgePointX1, endEdgePointY1, shiftedStartEdgeX1, shiftedStarEdgeY1, shiftedEndEdgeX1, shiftEndEdgeY1, brightnessFactor)
+
+' This subroutine creates the illusion of a shaded surface by drawing multiple lines
+' between two opposite edges of a quadrilateral. The density of these lines is
+' controlled by the brightnessFactor parameter - higher values produce sparser lines.
+'
+' Parameters:
+' startEdgePointX1/Y1 and endEdgePointX1/Y1 define one pair of points forming an edge
+' shiftedStartEdgeX1/Y1 and shiftedEndEdgeX1/Y1 define the opposite edge
+' brightnessFactor controls how densely packed the lines will be drawn
+
+' Local variables for working with point coordinates
+edgePointX1 = startEdgePointX1
+edgePointY1 = startEdgePointY1
+edgePointX2 = endEdgePointX1
+edgePointY2 = endEdgePointY1
+oppositePointX1 = shiftedStartEdgeX1
+oppositePointY1 = shiftedStarEdgeY1
+oppositePointX2 = shiftedEndEdgeX1
+oppositePointY2 = shiftEndEdgeY1
+
+' Calculate distance differences along first edge
+deltaX1 = edgePointX1 - edgePointX2
+deltaY1 = edgePointY1 - edgePointY2
+length1 = SQR((deltaX1 * deltaX1) + (deltaY1 * deltaY1))
+
+' Calculate distance differences along second edge
+deltaX2 = oppositePointX1 - oppositePointX2
+deltaY2 = oppositePointY1 - oppositePointY2
+length2 = SQR((deltaX2 * deltaX2) + (deltaY2 * deltaY2))
+
+' Average length determines number of steps based on brightness factor
+averageLength = (length1 + length2) / 2
+stepCount = averageLength / brightnessFactor
+
+' Calculate step increments for each axis
+xStep1 = (edgePointX2 - edgePointX1) / stepCount
+yStep1 = (edgePointY2 - edgePointY1) / stepCount
+xStep2 = (oppositePointX2 - oppositePointX1) / stepCount
+yStep2 = (oppositePointY2 - oppositePointY1) / stepCount
+
+' Draw intermediate connecting lines across the shape
+FOR stepIndex = 1 TO stepCount
+    edgePointX1 = edgePointX1 + xStep1
+    edgePointY1 = edgePointY1 + yStep1
+    oppositePointX1 = oppositePointX1 + xStep2
+    oppositePointY1 = oppositePointY1 + yStep2
+
+    ' Draw line between current interpolated points
+    LINE (edgePointX1, edgePointY1)-(oppositePointX1, oppositePointY1), 15
+NEXT stepIndex
+
+END SUB
\ No newline at end of file
diff --git a/2D GFX/Spirals/spiral, 6.png b/2D GFX/Spirals/spiral, 6.png
new file mode 100644
index 0000000..887f850
Binary files /dev/null and b/2D GFX/Spirals/spiral, 6.png differ
diff --git a/2D GFX/Spirals/spiral.bas b/2D GFX/Spirals/spiral.bas
new file mode 100644
index 0000000..bcf2d26
--- /dev/null
+++ b/2D GFX/Spirals/spiral.bas	
@@ -0,0 +1,59 @@
+DECLARE SUB DrawLine (startX AS DOUBLE, startY AS DOUBLE, endX AS DOUBLE, endY AS DOUBLE, col AS INTEGER)
+
+' Program to render fancy looking spiral.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+DIM SHARED lineVertexX(1 TO 100) AS DOUBLE
+DIM SHARED lineVertexY(1 TO 100) AS DOUBLE
+DIM SHARED depth AS INTEGER
+DIM SHARED tempDepth AS INTEGER
+SCREEN 12
+
+' Initialize the scale factor for the spiral
+spiralScaleFactor = 200
+depth = 0
+
+' Generate the spiral by iterating through angles and scaling appropriately
+FOR angle = 1 TO 30 STEP .1
+    ' Calculate the current scale based on the remaining distance to the center
+    spiralScaleFactor = (30 - angle) * 7
+    ' Convert polar coordinates to cartesian for the current point
+    xPosition = SIN(angle) * spiralScaleFactor + 200
+    yPosition = COS(angle) * spiralScaleFactor + 200
+    ' Store the current depth (z-axis value)
+    tempDepth = angle
+    ' Draw a line from the previous point to the current point with a color based on depth
+    DrawLine xPosition + (xPosition / 2) + (angle * 3), (yPosition - (xPosition / 3)) + (angle * 3), xPosition + 25, yPosition + 25 - (angle * 3), depth
+    ' Set the color for the next segment
+    depth = 15
+NEXT angle
+
+' Wait for user input to close the program
+userInput$ = INPUT$(1)
+
+SUB DrawLine (startX AS DOUBLE, startY AS DOUBLE, endX AS DOUBLE, endY AS DOUBLE, col AS INTEGER)
+    ' Calculate the step increments for x and y based on the depth
+    deltaX = (endX - startX) / tempDepth
+    deltaY = (endY - startY) / tempDepth
+
+    FOR segmentIndex = 1 TO tempDepth
+        ' If there is a previous vertex, draw a line to the new starting point
+        IF lineVertexX(segmentIndex) > 0 THEN LINE (lineVertexX(segmentIndex), lineVertexY(segmentIndex))-(startX, startY), col
+        ' Store the current starting point as the next vertex
+        lineVertexX(segmentIndex) = startX
+        lineVertexY(segmentIndex) = startY
+        ' Increment the starting point by the calculated deltas
+        startX = startX + deltaX
+        startY = startY + deltaY
+        ' Draw a line from the stored vertex to the new starting point
+        LINE (lineVertexX(segmentIndex), lineVertexY(segmentIndex))-(startX, startY), col
+    NEXT segmentIndex
+END SUB
diff --git a/2D GFX/Spirals/spiral.png b/2D GFX/Spirals/spiral.png
new file mode 100644
index 0000000..4c26bec
Binary files /dev/null and b/2D GFX/Spirals/spiral.png differ
diff --git a/2D GFX/Spirals/texture.dat b/2D GFX/Spirals/texture.dat
new file mode 100644
index 0000000..646d9b0
--- /dev/null
+++ b/2D GFX/Spirals/texture.dat	
@@ -0,0 +1,54 @@
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
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+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
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+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
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+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
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+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
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+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
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+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.
+.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M.M
+END
+                                         
diff --git a/2D GFX/Spirals/texture1.dat b/2D GFX/Spirals/texture1.dat
new file mode 100644
index 0000000..3f591e5
--- /dev/null
+++ b/2D GFX/Spirals/texture1.dat	
@@ -0,0 +1,35 @@
+..........................................
+...........................MMM.M.M.MM.....
+............................M..MMM.M......
+............................M..M.M.MM.....
+...................................M......
+............................MM.....MM.....
+............................M.............
+............................MM.MM..MM.....
+............................M..M.M.M.M....
+............................MM.M.M.MM.....
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+..........................................
+END
+                                         
diff --git a/2D GFX/Stroboscope.bas b/2D GFX/Stroboscope.bas
new file mode 100644
index 0000000..e988ef1
--- /dev/null
+++ b/2D GFX/Stroboscope.bas	
@@ -0,0 +1,514 @@
+' Presentation about how to build stroboscope.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2024 - 2025, Improved program readability
+
+DECLARE SUB InitializePresentation ()
+DECLARE SUB WaitForKeyPress (keyInput$)
+DECLARE SUB MoveModel ()
+DEFINT A-Z
+DECLARE SUB DrawLines ()
+DECLARE SUB Load3DModel ()
+DECLARE SUB Animate3DModel ()
+DECLARE SUB ClearScreen ()
+DECLARE SUB LoadFontPalette ()
+DECLARE SUB PrintText (x2%, y%, s%, c%, t$)
+DECLARE SUB DisplayClosingPage ()
+
+DECLARE SUB ProgramStart ()
+
+DIM SHARED font(0 TO 7, 0 TO 15, 0 TO 207)
+DIM SHARED paletteData(1 TO 100)
+DIM SHARED originalX1(1 TO 1000)
+DIM SHARED originalY1(1 TO 1000)
+DIM SHARED originalX2(1 TO 1000)
+DIM SHARED originalY2(1 TO 1000)
+DIM SHARED previousX1(1 TO 1000)
+DIM SHARED previousY1(1 TO 1000)
+DIM SHARED previousX2(1 TO 1000)
+DIM SHARED previousY2(1 TO 1000)
+DIM SHARED lineColor(1 TO 1000)
+
+DIM SHARED movementX, movementY, zoomLevel
+DIM SHARED startX, startY, startZoom
+DIM SHARED endX, endY, endZoom
+DIM SHARED totalFrames
+
+DIM SHARED lineCount
+
+ProgramStart
+
+InitializePresentation
+ClearScreen
+Animate3DModel
+DisplayClosingPage
+END
+
+DATA 0,0,5,-2
+DATA 0,0,5,2
+DATA 0, 0, 15, 0
+
+DATA 15,-2,15,2
+DATA 25,-2,25,2
+DATA 15,-2,25,-2
+DATA 15,2,25,2
+
+DATA 25,0,35,0
+DATA 35,-2,35,2
+DATA 35,-2,40,0
+DATA 35,2,40,0
+DATA 40,-2,40,2
+
+DATA 40,0,80,0
+DATA 50,0,50,19
+DATA 48,19,52,19
+DATA 48,21,52,21
+DATA 50,21,50,35
+
+DATA 0,35,125,35
+DATA 0,35,5,33
+DATA 0,35,5,37
+
+DATA 70,0,70,15
+DATA 70,35,70,20
+DATA 69,16,71,19
+DATA 69,19,71,16
+DATA 67,10,73,10
+DATA 67,25,73,25
+DATA 67,10,67,25
+DATA 73,10,73,25
+
+DATA 75,15,75,25
+DATA 75,20,90,20
+DATA 90,20,91,21
+DATA 91,21,90,22
+DATA 90,22,91,23
+DATA 91,23,90,24
+DATA 90,24,91,25
+DATA 91,25,90,26
+DATA 90,26,90,35
+
+DATA 93,18,93,28
+DATA 92,18,92,28
+
+DATA 95,20,94,21
+DATA 94,21,95,22
+DATA 95,22,94,23
+DATA 94,23,95,24
+DATA 95,24,94,25
+DATA 94,25,95,26
+DATA 95,26,95,35
+
+DATA 95, 20, 115, 20
+DATA 115,20,115,15
+DATA 115,7,115,0
+DATA 125,35,125,26
+DATA 123,26,127,26
+DATA 123,24,127,24
+DATA 125,24,125,0
+DATA 125,0,110,0
+DATA 110,-2,110,2
+DATA 100,-2,100,2
+DATA 100,-2,110,-2
+DATA 100,2,110,2
+
+DATA 100,0,90,0
+DATA 90,-2,90,2
+DATA 80,-2,80,2
+DATA 80,-2,90,-2
+DATA 80,2,90,2
+
+DATA 113,5,117,5
+DATA 113,17,117,17
+DATA 113,5,113,17
+DATA 117,5,117,17
+DATA 115,11,125,11
+
+DATA 105,-2,105,-5
+DATA 105,-5,113,-5
+DATA 113,-5,113,0
+DATA 105,-2,104,-4
+DATA 105,-2,106,-4
+
+DATA 999,999,999,999
+
+SUB Animate3DModel
+    ' Set up first animation parameters
+    startX = 20
+    startY = 15
+    startZoom = 100
+    endX = 20
+    endY = 15
+    endZoom = 10
+    totalFrames = 20
+
+    MoveModel
+
+    ' Print technical information
+    PrintText 147, 66, 1, 3, "100   D336B             180k    680k"
+    PrintText 180, 120, 1, 3, "50m 450V                          1m"
+    PrintText 180, 400, 2, 14, "Principal schematic"
+
+    WaitForKeyPress keyInput$
+
+    ' Clear screen for next animation
+    LINE (0, 0)-(639, 390), 0, BF
+
+    ' Set up second animation parameters
+    startX = 20
+    startY = 15
+    startZoom = 10
+    endX = 80
+    endY = 5
+    endZoom = 4
+    totalFrames = 20
+    MoveModel
+    WaitForKeyPress keyInput$
+
+    ' Set up third animation parameters
+    startX = 80
+    startY = 5
+    startZoom = 4
+    endX = 40
+    endY = 5
+    endZoom = 4
+    totalFrames = 20
+    MoveModel
+    WaitForKeyPress keyInput$
+
+    ' Set up fourth animation parameters
+    startX = 40
+    startY = 5
+    startZoom = 4
+    endX = 20
+    endY = 15
+    endZoom = 10
+    totalFrames = 10
+    MoveModel
+
+    ' Redraw technical information
+    PrintText 147, 66, 1, 3, "100   D336B             180k    680k"
+    PrintText 180, 120, 1, 3, "50m 450V                          1m"
+    WaitForKeyPress keyInput$
+END SUB
+
+SUB ClearScreen
+    ' change screen resolution. This also resets color palette.
+    SCREEN 13
+    SCREEN 12
+END SUB
+
+SUB DisplayClosingPage
+    CLS
+    SCREEN 13
+    PrintText 35, 100, 2, 14, "   Thank you"
+    PrintText 35, 140, 2, 14, " for attention!"
+
+    ' Create closing animation effect
+    DIM buffer(1 TO 30000)
+    GET (0, 100)-(319, 199), buffer(1)
+
+    ' Move text down with delay
+    FOR y = 100 TO 50 STEP -1
+        PUT (0, y), buffer(1), PSET
+        SOUND 0, .5
+    NEXT y
+
+    WaitForKeyPress keyInput$
+    SYSTEM
+END SUB
+
+SUB DrawLines
+    ' Draw all lines in the schematic with current transformation parameters.
+    ' First calculate new screen coordinates based on movement and zoom.
+    ' Then draw lines by erasing previous positions and drawing new ones.
+
+    FOR a = 1 TO lineCount
+        ' Calculate relative coordinates from original positions
+        x1 = originalX1(a) - movementX
+        y1 = originalY1(a) - movementY
+        x2 = originalX2(a) - movementX
+        y2 = originalY2(a) - movementY
+
+        ' Apply zoom scaling and centering (320x200 screen)
+        x1 = x1 * 30 / zoomLevel + 160
+        y1 = y1 * 30 / zoomLevel + 100
+        x2 = x2 * 30 / zoomLevel + 160
+        y2 = y2 * 30 / zoomLevel + 100
+
+        ' Erase previous line by drawing in black (color 0)
+        LINE (previousX1(a), previousY1(a))-(previousX2(a), previousY2(a)), 0
+
+        ' Draw new line with appropriate color
+        LINE (x1, y1)-(x2, y2), lineColor(a)
+
+        ' Update previous positions for next frame
+        previousX1(a) = x1
+        previousY1(a) = y1
+        previousX2(a) = x2
+        previousY2(a) = y2
+    NEXT a
+END SUB
+
+SUB InitializePresentation
+    ' Set up screen and create title animation
+    SCREEN 13
+
+    ' Configure palette for title animation
+    a = 0
+    FOR c = 16 TO 31
+        OUT &H3C8, c
+        OUT &H3C9, a * 3
+        OUT &H3C9, a * 4.5
+        OUT &H3C9, a * 0
+        a = a + 1
+    NEXT c
+
+    ' Set special colors for title effects
+    OUT &H3C8, 101
+    OUT &H3C9, 63
+    OUT &H3C9, 63
+    OUT &H3C9, 0
+
+    OUT &H3C8, 102
+    OUT &H3C9, 63
+    OUT &H3C9, 10
+    OUT &H3C9, 10
+
+    OUT &H3C8, 103
+    OUT &H3C9, 60
+    OUT &H3C9, 60
+    OUT &H3C9, 0
+
+    ' Configure palette for background text
+    a = 0
+    FOR c = 50 TO 65
+        OUT &H3C8, c
+        OUT &H3C9, a * 4.5
+        OUT &H3C9, a * 0
+        OUT &H3C9, (15 - a) * 4.5
+        a = a + 1
+    NEXT c
+
+    ' Create scrolling title animation
+    titleText$ = " Esitlus teemal:"
+
+    FOR t = 0 TO 400
+        ' Scroll title text across screen
+        IF t < 320 THEN
+            FOR y = 0 TO 199
+                c = POINT(319 - t, y)
+                IF c < 100 THEN c = c + 34
+                PSET (319 - t, y), c
+            NEXT y
+
+            x = 319 - t
+            ' Add text to scrolling animation
+            IF x / 16 = x \ 16 THEN
+                segment = x / 16
+                IF segment <= LEN(titleText$) THEN
+                    char$ = RIGHT$(LEFT$(titleText$, segment), 1)
+                    PrintText x, 20, 2, 101, char$
+                END IF
+            END IF
+        END IF
+
+        ' Create second animation phase
+        IF (t < 360) AND (t > 39) THEN
+            FOR y = 0 TO 13
+                c = POINT(359 - t, y)
+                IF c < 100 THEN c = c - 34
+                PSET (359 - t, y), c
+            NEXT y
+
+            FOR y = 55 TO 199
+                c = POINT(359 - t, y)
+                IF c < 100 THEN c = c - 34
+                PSET (359 - t, y), c
+            NEXT y
+        END IF
+
+        ' Frame delay using sound command
+        SOUND 0, .2
+    NEXT t
+
+    ' Draw final title text
+    PrintText 31, 101, 3, 102, "STROBOSKOOP"
+    PrintText 29, 99, 3, 102, "STROBOSKOOP"
+    PrintText 30, 100, 3, 103, "STROBOSKOOP"
+
+    ' Create color flipping effect for title
+    FOR x = 0 TO 160
+        FOR y = 100 TO 150
+            c = POINT(x, y)
+            IF c = 102 THEN c = 103: GOTO 2
+            IF c = 103 THEN c = 102: GOTO 2
+2
+            PSET (x, y), c
+        NEXT y
+        SOUND 0, .1
+    NEXT x
+
+    ' Continue color flipping effect
+    FOR y = 199 TO 120 STEP -1
+        FOR x = 0 TO 319
+            c = POINT(x, y)
+            IF c = 102 THEN c = 103: GOTO 3
+            IF c = 103 THEN c = 102: GOTO 3
+3
+            PSET (x, y), c
+        NEXT x
+        SOUND 0, .1
+    NEXT y
+
+    ' Print author information
+    PrintText 49, 179, 1, 0, "autor: Svjatoslav Agejenko"
+    PrintText 51, 181, 1, 0, "autor: Svjatoslav Agejenko"
+    PrintText 50, 180, 1, 15, "autor: Svjatoslav Agejenko"
+
+    ' Wait for user input before continuing
+    WaitForKeyPress keyInput$
+
+    ' Create screen border effect
+    DIM buffer(1 TO 30000)
+    FOR a = 1 TO 320 / 5
+        ' Capture and move screen sections
+        GET (0, 0)-(314, 100), buffer(1)
+        PUT (5, 0), buffer(1), PSET
+        LINE (0, 0)-(4, 100), 0, BF
+
+        GET (5, 101)-(319, 199), buffer(1)
+        PUT (0, 101), buffer(1), PSET
+        LINE (315, 101)-(319, 199), 0, BF
+    NEXT a
+END SUB
+
+SUB LoadFontPalette
+    ' Capture pixel data for each character in font array.
+    ' Make colors invisible for the human while doing so.
+
+    FOR c = 0 TO 15
+        OUT &H3C8, c
+        OUT &H3C9, 0
+        OUT &H3C9, 0
+        OUT &H3C9, 0
+    NEXT c
+
+    ' Load character pixel patterns into font array
+    FOR a = 0 TO 207
+        LOCATE 1, 1
+        IF (a > 5) AND (a < 14) THEN GOTO 1
+        PRINT CHR$(a)
+1
+        FOR y = 0 TO 15
+            FOR x = 0 TO 7
+                font(x, y, a) = POINT(x, y)
+            NEXT x
+        NEXT y
+    NEXT a
+END SUB
+
+SUB LoadSchematic
+    ' Load 3D model line data from DATA statements
+    ' Each line has two endpoints (x1,y1)-(x2,y2) and color
+
+    lineCount = 0
+5
+    READ x1, y1, x2, y2
+    IF x1 = 999 THEN GOTO 6
+    lineCount = lineCount + 1
+    originalX1(lineCount) = x1
+    originalY1(lineCount) = y1
+    originalX2(lineCount) = x2
+    originalY2(lineCount) = y2
+    lineColor(lineCount) = 11
+    GOTO 5
+6
+END SUB
+
+SUB MoveModel
+    ' Calculate model movement over time frames
+    ' Interpolate between start and end positions
+
+    movementXVelocity = endX - startX
+    movementYVelocity = endY - startY
+    zoomVelocity = endZoom - startZoom
+
+    ' Animate model by gradually changing position and zoom
+    FOR a = 1 TO totalFrames
+        movementX = startX + (movementXVelocity * a / totalFrames)
+        movementY = startY + (movementYVelocity * a / totalFrames)
+        zoomLevel = startZoom + (zoomVelocity * a / totalFrames)
+        DrawLines
+        ' Use sound command for sub-second delay (QBasic workaround)
+        SOUND 0, 1
+    NEXT a
+
+    ' Draw final position
+    DrawLines
+END SUB
+
+SUB PrintText (x2%, y%, s%, c%, t$)
+    ' Print text using custom font
+    ' Parameters:
+    ' x2% - starting x position
+    ' y% - starting y position
+    ' s% - character size multiplier
+    ' c% - color to use
+    ' t$ - text string to print
+
+    currentX = x2
+
+    ' Process each character in the string
+    FOR a = 1 TO LEN(t$)
+        charCode = ASC(RIGHT$(LEFT$(t$, a), 1))
+
+        ' Draw character using font data
+        FOR y1 = 0 TO 15
+            FOR x1 = 0 TO 7
+                IF font(x1, y1, charCode) > 0 THEN
+                    ' Draw filled rectangle for each pixel in character
+                    LINE (x1 * s + currentX, y1 * s + y)-(x1 * s + s - 1 + currentX, y1 * s + s - 1 + y), c, BF
+                END IF
+            NEXT x1
+        NEXT y1
+
+        ' Move to next character position
+        currentX = currentX + (8 * s)
+    NEXT a
+END SUB
+
+SUB ProgramStart
+    ' Initialize program with appropriate screen mode
+    SCREEN 12
+    LoadSchematic
+    LoadFontPalette
+
+    ' Set initial model parameters
+    movementX = 30
+    movementY = 15
+    zoomLevel = 10
+END SUB
+
+SUB WaitForKeyPress (keyInput$)
+    ' Clear keyboard buffer to avoid ghost keys
+    FOR a = 1 TO 50
+        keyInput$ = INKEY$
+    NEXT a
+
+7
+    keyInput$ = INKEY$
+    IF keyInput$ = "" THEN GOTO 7
+
+    ' Wait for another key press after initial one
+    FOR a = 1 TO 50
+        keyInput$ = INKEY$
+    NEXT a
+END SUB
+
diff --git a/2D GFX/Stroboscope.png b/2D GFX/Stroboscope.png
new file mode 100644
index 0000000..0baee1c
Binary files /dev/null and b/2D GFX/Stroboscope.png differ
diff --git a/2D GFX/Textures/Circular waves.bas b/2D GFX/Textures/Circular waves.bas
new file mode 100755
index 0000000..7ef6fa8
--- /dev/null
+++ b/2D GFX/Textures/Circular waves.bas	
@@ -0,0 +1,36 @@
+' Program to render circular wave patterns.
+' Algorithm was accidentally discovered while experimenting with sine function.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003, Initial version
+' 2025, Improved program readability
+
+SCREEN 13
+
+' Initialize the screen mode to 320x200 with 16 colors
+
+' Outer loop for the vertical axis (y-coordinate)
+FOR ycoordinate = 1 TO 199
+    ' Inner loop for the horizontal axis (x-coordinate)
+    FOR xcoordinate = 1 TO 319
+        ' Calculate the sine value based on the squared distances from the origin
+        colorvalue = SIN((xcoordinate ^ 2 + ycoordinate ^ 2) / 10) * 10
+
+        ' Clamp the color value to the range [0, 15]
+        IF colorvalue < 0 THEN colorvalue = 0
+        IF colorvalue > 15 THEN colorvalue = 15
+
+        ' Set the pixel color at (xcoordinate, ycoordinate) with an offset to use the full 16-color palette
+        PSET (xcoordinate, ycoordinate), colorvalue + 16
+    NEXT xcoordinate
+NEXT ycoordinate
+
+' Wait for user key press
+WHILE INKEY$ = "": WEND
+CLS
+END
diff --git a/2D GFX/Textures/Circular waves.png b/2D GFX/Textures/Circular waves.png
new file mode 100644
index 0000000..fbb5233
Binary files /dev/null and b/2D GFX/Textures/Circular waves.png differ
diff --git a/2D GFX/Textures/Diamond square clouds.bas b/2D GFX/Textures/Diamond square clouds.bas
new file mode 100755
index 0000000..1662586
--- /dev/null
+++ b/2D GFX/Textures/Diamond square clouds.bas	
@@ -0,0 +1,96 @@
+DECLARE SUB DrawPixels (x1 AS INTEGER, y1 AS INTEGER, s AS INTEGER)
+' Program to render cloud surface using diamond square algorithm.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+DECLARE SUB DrawBox (x1 AS INTEGER, y1 AS INTEGER, s AS INTEGER)
+DECLARE SUB SetPalette ()
+DECLARE SUB InitializeProgram ()
+DEFINT A-Z
+InitializeProgram
+
+DIM SHARED maxLightness AS INTEGER
+maxLightness = 127
+
+DIM scale AS INTEGER
+scale = 2 ^ 8
+
+1 :
+scale = scale \ 2
+x1 = (319 \ scale) - 1
+y1 = (199 \ scale) - 1
+
+FOR y = 0 TO y1
+    FOR x = 0 TO x1
+        DrawPixels x * scale, y * scale, scale
+    NEXT x
+NEXT y
+
+IF scale > 2 THEN GOTO 1
+WAITa$ = INPUT$(1)
+
+SUB DrawPixels (x1 AS INTEGER, y1 AS INTEGER, s AS INTEGER)
+    ' Get the lightness values for the corners of the box
+    c1 = POINT(x1, y1)
+    c2 = POINT(x1 + s, y1)
+    c3 = POINT(x1, y1 + s)
+    c4 = POINT(x1 + s, y1 + s)
+
+    ' Calculate the midpoint lightness values
+    sp = s \ 2
+    k = s * 2
+    kp = k / 2
+
+    cc2 = ((c1 + c2) / 2) + (RND * k) - kp
+    IF cc2 > maxLightness THEN cc2 = maxLightness
+    IF cc2 < 0 THEN cc2 = 0
+
+    cc3 = ((c1 + c3) / 2) + (RND * k) - kp
+    IF cc3 > maxLightness THEN cc3 = maxLightness
+    IF cc3 < 0 THEN cc3 = 0
+
+    cc4 = ((c2 + c4) / 2) + (RND * k) - kp
+    IF cc4 > maxLightness THEN cc4 = maxLightness
+    IF cc4 < 0 THEN cc4 = 0
+
+    cc5 = ((c3 + c4) / 2) + (RND * k) - kp
+    IF cc5 > maxLightness THEN cc5 = maxLightness
+    IF cc5 < 0 THEN cc5 = 0
+
+    ' Calculate the central lightness value
+    cc1 = ((cc2 + cc3 + cc4 + cc5) / 4) + (RND * k) - kp
+    IF cc1 > maxLightness THEN cc1 = maxLightness
+    IF cc1 < 0 THEN cc1 = 0
+
+    ' Set the calculated lightness values for the box
+    PSET (x1 + sp, y1 + sp), cc1
+    PSET (x1 + sp, y1), cc2
+    PSET (x1, y1 + sp), cc3
+    PSET (x1 + s, y1 + sp), cc4
+    PSET (x1 + sp, y1 + s), cc5
+END SUB
+
+SUB InitializeProgram
+    ' Set the screen mode and initialize the color palette
+    SCREEN 13
+    SetPalette
+    RANDOMIZE TIMER
+END SUB
+
+SUB SetPalette
+    ' Set the color palette for lightness levels
+    FOR a = 0 TO 255
+        OUT &H3C8, a
+        OUT &H3C9, a / 4
+        OUT &H3C9, a / 3
+        OUT &H3C9, a / 2.3
+    NEXT a
+END SUB
+
diff --git a/2D GFX/Textures/Diamond square clouds.png b/2D GFX/Textures/Diamond square clouds.png
new file mode 100644
index 0000000..b596db6
Binary files /dev/null and b/2D GFX/Textures/Diamond square clouds.png differ
diff --git a/2D GFX/Textures/Old paper.bas b/2D GFX/Textures/Old paper.bas
new file mode 100755
index 0000000..bc012e5
--- /dev/null
+++ b/2D GFX/Textures/Old paper.bas	
@@ -0,0 +1,64 @@
+' Program to render surface resembling old paper.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003, Initial version
+' 2025, Improved program readability
+
+DEFINT A-Z
+SCREEN 13
+RANDOMIZE TIMER
+
+' Initialize the color palette to grayscale. Each color index from 0 to 63 has R, G, B values equal to the index,
+' creating a smooth grayscale gradient for the 256-color mode.
+FOR paletteIndex = 0 TO 63
+    OUT &H3C8, paletteIndex
+    OUT &H3C9, paletteIndex  ' Set red component
+    OUT &H3C9, paletteIndex  ' Set green component
+    OUT &H3C9, paletteIndex  ' Set blue component
+NEXT paletteIndex
+
+noiseOffset = 0
+
+' Generate a paper-like surface by averaging the color of the pixel above with some randomness.
+' This creates a procedural texture that mimics the roughness of paper.
+FOR y = 1 TO 190
+    FOR x = 1 TO 310
+        stepCounter = stepCounter + 1
+
+        ' Approximately every 10 steps, introduce a new random noise offset to create variation in the pattern.
+        ' This prevents the surface from becoming too uniform.
+        IF stepCounter > 10 THEN
+            noiseOffset = RND * currentColor / 20
+            stepCounter = stepCounter - (RND * 20 + 10)
+        END IF
+
+        ' Get the color of the pixel directly above the current position.
+        topColor = POINT(x, y - 1)
+
+        ' Calculate the current color as the average of the top color and the previous current color,
+        ' plus a small random noise and minus the noise offset. This creates a smooth transition with
+        ' controlled randomness.
+        currentColor = (topColor + currentColor) \ 2 + ((RND * 2) - noiseOffset)
+
+        ' Clamp the color value to stay within the valid palette range (0 to 63).
+        IF currentColor < 0 THEN currentColor = 0
+        IF currentColor > 63 THEN currentColor = 63
+
+        ' Plot the current pixel at (x-1, y) using the calculated color.
+        PSET (x - 1, y), currentColor
+    NEXT x
+
+    ' Set the starting color for the next row to the last calculated color of the current row.
+    ' This ensures continuity between rows.
+    PSET (0, y + 1), currentColor
+NEXT y
+
+' Wait for a single key press before exiting the program.
+inputKey$ = INPUT$(1)
+
+SYSTEM
diff --git a/2D GFX/Textures/Old paper.png b/2D GFX/Textures/Old paper.png
new file mode 100644
index 0000000..d9c900b
Binary files /dev/null and b/2D GFX/Textures/Old paper.png differ
diff --git a/2D GFX/Textures/Wood.bas b/2D GFX/Textures/Wood.bas
new file mode 100755
index 0000000..c3251f7
--- /dev/null
+++ b/2D GFX/Textures/Wood.bas	
@@ -0,0 +1,75 @@
+' Program to render surface resembling wood.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024 - 2025, Improved program readability
+
+DECLARE SUB DrawWoodSurface (woodX%, woodY%)
+DECLARE SUB DrawPaper (xPos%, y1Pos%)
+DEFINT A-Z
+SCREEN 12
+RANDOMIZE TIMER
+
+' Set palette colors
+FOR colorIndex = 0 TO 15
+    OUT &H3C8, colorIndex
+    OUT &H3C9, colorIndex * 4
+    OUT &H3C9, colorIndex * 3
+    OUT &H3C9, colorIndex * 0
+NEXT colorIndex
+
+' Main loop to draw wood at random positions
+100:
+woodX = RND * 400 + 200
+woodY = RND * 100 + 200
+CALL DrawWoodSurface(woodX, woodY)
+GOTO 100
+
+' Wait for user input to exit
+exitKey$ = INPUT$(1)
+
+SUB DrawWoodSurface (woodX, woodY)
+    DIM lowerY AS INTEGER
+    DIM phaseOffset AS INTEGER
+    DIM xStepCounter AS INTEGER
+    DIM randomOffset AS INTEGER
+    DIM newColor AS INTEGER
+    DIM upperColor AS INTEGER
+    DIM currentColor AS INTEGER
+
+    ' Draw the outline of the wood
+    lowerY = woodY + 1
+    LINE (0, 0)-(woodX, woodY), 0, BF  ' Black background
+    LINE (5, 5)-(woodX - 5, lowerY - 5), 8, BF  ' Gray wood outline
+    LINE (10, 10)-(woodX - 10, lowerY - 10), 15, BF  ' White inner highlight
+
+    ' Initialize random phase offset for color variation
+    phaseOffset = RND * 300
+
+    ' Draw the wood texture
+    FOR y = woodY - 1 TO 0 STEP -1
+        FOR x = woodX - 1 TO 0 STEP -1
+            xStepCounter = xStepCounter + 1
+            IF xStepCounter > woodX THEN
+                randomOffset = RND * 13  ' Small random noise for texture variation
+                xStepCounter = SIN((y + phaseOffset) / 100) * woodX  ' Sine wave to create wavy grain pattern
+            END IF
+            upperColor = POINT(x, y + 1)  ' Get color from upper pixel
+            currentColor = POINT(x, y)    ' Get color from current pixel
+            newColor = (upperColor * 2 + currentColor + newColor * 3 + randomOffset) / 7 + RND * 1
+
+            ' Ensure color value is within the valid range (0-15)
+            IF newColor < 0 THEN newColor = 0
+            IF newColor > 15 THEN newColor = 15
+
+            ' Set the pixel color for the wood texture
+            PSET (x + 1, y), newColor
+        NEXT x
+    NEXT y
+
+END SUB
diff --git a/2D GFX/Textures/Wood.png b/2D GFX/Textures/Wood.png
new file mode 100644
index 0000000..00726c3
Binary files /dev/null and b/2D GFX/Textures/Wood.png differ
diff --git a/2D GFX/Textures/Yellow flame.bas b/2D GFX/Textures/Yellow flame.bas
new file mode 100755
index 0000000..a60c235
--- /dev/null
+++ b/2D GFX/Textures/Yellow flame.bas	
@@ -0,0 +1,47 @@
+' Yellow flame.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+
+DEFINT A-Z ' Define all variables as integers
+SCREEN 13 ' Set graphics mode to 320x200 with 256 colors
+RANDOMIZE TIMER ' Seed the random number generator
+
+' Initialize palette registers with sine wave colors
+FOR paletteIndex = 0 TO 255
+    OUT &H3C8, paletteIndex
+    OUT &H3C9, INT(SIN(paletteIndex / 21) * 30 + 30)
+    OUT &H3C9, INT(SIN(paletteIndex / 34) * 30 + 30)
+    OUT &H3C9, INT(SIN(paletteIndex / 10) * 30 + 30)
+NEXT paletteIndex
+
+' Generate the surface pattern
+FOR y = 1 TO 199
+    FOR x = 1 TO 319
+        prevPixel = POINT(x, y - 1)
+        leftPixel = POINT(x - 1, y)
+        diagPixel = POINT(x - 1, y - 1)
+        left2Pixel = POINT(x - 2, y)
+
+        ' Calculate the average of surrounding pixels and add some randomness
+        newColor = (prevPixel + leftPixel + diagPixel + left2Pixel) \ 4 + (RND * 5 - 2)
+
+        ' Clamp the color value within the valid range
+        IF newColor < 0 THEN newColor = 0
+        IF newColor > 63 THEN newColor = 63
+
+        ' Set the pixel with the calculated color
+        PSET (x, y), newColor
+    NEXT x
+NEXT y
+
+' Wait for user input to exit
+userInput$ = INPUT$(1)
+
diff --git a/2D GFX/Textures/Yellow flame.png b/2D GFX/Textures/Yellow flame.png
new file mode 100644
index 0000000..762a97b
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diff --git a/2D GFX/Textures/index.html b/2D GFX/Textures/index.html
new file mode 100644
index 0000000..dc6dbcc
--- /dev/null
+++ b/2D GFX/Textures/index.html	
@@ -0,0 +1,627 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2025-07-28 ma 03:32 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Fractals</title>
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
+  .subtitle { text-align: center;
+              font-size: medium;
+              font-weight: bold;
+              margin-top:0; }
+  .todo   { font-family: monospace; color: red; }
+  .done   { font-family: monospace; color: green; }
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+  .tag    { background-color: #eee; font-family: monospace;
+            padding: 2px; font-size: 80%; font-weight: normal; }
+  .timestamp { color: #bebebe; }
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+  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #e6e6e6;
+    border-radius: 3px;
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+    overflow: auto;
+    margin: 1.2em;
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+  pre.src-nxml:before { content: 'XML'; }
+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
+  caption.t-above { caption-side: top; }
+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
+  th.org-left   { text-align: center;   }
+  th.org-center { text-align: center; }
+  td.org-right  { text-align: right;  }
+  td.org-left   { text-align: left;   }
+  td.org-center { text-align: center; }
+  dt { font-weight: bold; }
+  .footpara { display: inline; }
+  .footdef  { margin-bottom: 1em; }
+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
+  .org-info-js_info-navigation { border-style: none; }
+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
+<style type="text/css">
+               body {
+                 max-width: 35cm !important;
+               }
+               #content {
+                 max-width: 80em !important;
+                 width: 90%;
+               }
+               </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">Fractals</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#orge4e7ce1">1. Circular waves</a></li>
+<li><a href="#org99c6cfa">2. Diamond square clouds</a></li>
+<li><a href="#orgbf537cb">3. Old paper</a></li>
+<li><a href="#org0540284">4. Wood</a></li>
+<li><a href="#org4685bf9">5. Yellow flame</a></li>
+</ul>
+</div>
+</div>
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+
+<div id="outline-container-orge4e7ce1" class="outline-2">
+<h2 id="orge4e7ce1"><span class="section-number-2">1.</span> Circular waves</h2>
+<div class="outline-text-2" id="text-1">
+<p class="responsive-img">
+<img src="Circular waves.png" alt="Circular waves.png" class="responsive-img" />
+<a href="Circular waves.bas">Source code</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Program to render circular wave patterns.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Algorithm was accidentally discovered while experimenting with sine function.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2025, Improved program readability</span>
+
+<span style="color: #ee8899;">SCREEN</span> 13
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Initialize the screen mode to 320x200 with 16 colors</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Outer loop for the vertical axis (y-coordinate)</span>
+<span style="color: #bb99ee;">FOR</span> ycoordinate = 1 <span style="color: #bb99ee;">TO</span> 199
+    <span style="color: #666677;">' </span><span style="color: #666677;">Inner loop for the horizontal axis (x-coordinate)</span>
+    <span style="color: #bb99ee;">FOR</span> xcoordinate = 1 <span style="color: #bb99ee;">TO</span> 319
+        <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the sine value based on the squared distances from the origin</span>
+        colorvalue = <span style="color: #88aaee;">SIN</span>((xcoordinate ^ 2 + ycoordinate ^ 2) / 10) * 10
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Clamp the color value to the range [0, 15]</span>
+        <span style="color: #bb99ee;">IF</span> colorvalue &lt; 0 <span style="color: #bb99ee;">THEN</span> colorvalue = 0
+        <span style="color: #bb99ee;">IF</span> colorvalue &gt; 15 <span style="color: #bb99ee;">THEN</span> colorvalue = 15
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Set the pixel color at (xcoordinate, ycoordinate) with an offset to use the full 16-color palette</span>
+        <span style="color: #ee8899;">PSET</span> (xcoordinate, ycoordinate), colorvalue + 16
+    <span style="color: #bb99ee;">NEXT</span> xcoordinate
+<span style="color: #bb99ee;">NEXT</span> ycoordinate
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for user key press</span>
+<span style="color: #bb99ee;">WHILE</span> <span style="color: #88aaee;">INKEY$</span> = <span style="color: #99dd99;">""</span>: <span style="color: #bb99ee;">WEND</span>
+<span style="color: #ee8899;">CLS</span>
+<span style="color: #bb99ee;">END</span>
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org99c6cfa" class="outline-2">
+<h2 id="org99c6cfa"><span class="section-number-2">2.</span> Diamond square clouds</h2>
+<div class="outline-text-2" id="text-2">
+<p class="responsive-img">
+<img src="Diamond square clouds.png" alt="Diamond square clouds.png" class="responsive-img" />
+<a href="Diamond square clouds.bas">Source code</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> DrawPixels (x1 <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>, y1 <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>, s <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>)
+<span style="color: #666677;">' </span><span style="color: #666677;">Program to render cloud surface using diamond square algorithm.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024.08, Improved program readability</span>
+
+<span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> DrawBox (x1 <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>, y1 <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>, s <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>)
+<span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> SetPalette ()
+<span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> InitializeProgram ()
+<span style="color: #bb99ee;">DEFINT</span> A-Z
+InitializeProgram
+
+<span style="color: #bb99ee;">DIM</span> <span style="color: #ee8899;">SHARED</span> maxLightness <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+maxLightness = 127
+
+<span style="color: #bb99ee;">DIM</span> scale <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+scale = 2 ^ 8
+
+<span style="color: #eeaa77;">1</span> :
+scale = scale \ 2
+x1 = (319 \ scale) - 1
+y1 = (199 \ scale) - 1
+
+<span style="color: #bb99ee;">FOR</span> y = 0 <span style="color: #bb99ee;">TO</span> y1
+    <span style="color: #bb99ee;">FOR</span> x = 0 <span style="color: #bb99ee;">TO</span> x1
+        DrawPixels x * scale, y * scale, scale
+    <span style="color: #bb99ee;">NEXT</span> x
+<span style="color: #bb99ee;">NEXT</span> y
+
+<span style="color: #bb99ee;">IF</span> scale &gt; 2 <span style="color: #bb99ee;">THEN</span> <span style="color: #bb99ee;">GOTO</span> <span style="color: #eeaa77;">1</span>
+WAITa$ = <span style="color: #88aaee;">INPUT$</span>(1)
+
+<span style="color: #bb99ee;">SUB</span> DrawPixels (x1 <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>, y1 <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>, s <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>)
+    <span style="color: #666677;">' </span><span style="color: #666677;">Get the lightness values for the corners of the box</span>
+    c1 = <span style="color: #88aaee;">POINT</span>(x1, y1)
+    c2 = <span style="color: #88aaee;">POINT</span>(x1 + s, y1)
+    c3 = <span style="color: #88aaee;">POINT</span>(x1, y1 + s)
+    c4 = <span style="color: #88aaee;">POINT</span>(x1 + s, y1 + s)
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the midpoint lightness values</span>
+    sp = s \ 2
+    k = s * 2
+    kp = k / 2
+
+    cc2 = ((c1 + c2) / 2) + (<span style="color: #88aaee;">RND</span> * k) - kp
+    <span style="color: #bb99ee;">IF</span> cc2 &gt; maxLightness <span style="color: #bb99ee;">THEN</span> cc2 = maxLightness
+    <span style="color: #bb99ee;">IF</span> cc2 &lt; 0 <span style="color: #bb99ee;">THEN</span> cc2 = 0
+
+    cc3 = ((c1 + c3) / 2) + (<span style="color: #88aaee;">RND</span> * k) - kp
+    <span style="color: #bb99ee;">IF</span> cc3 &gt; maxLightness <span style="color: #bb99ee;">THEN</span> cc3 = maxLightness
+    <span style="color: #bb99ee;">IF</span> cc3 &lt; 0 <span style="color: #bb99ee;">THEN</span> cc3 = 0
+
+    cc4 = ((c2 + c4) / 2) + (<span style="color: #88aaee;">RND</span> * k) - kp
+    <span style="color: #bb99ee;">IF</span> cc4 &gt; maxLightness <span style="color: #bb99ee;">THEN</span> cc4 = maxLightness
+    <span style="color: #bb99ee;">IF</span> cc4 &lt; 0 <span style="color: #bb99ee;">THEN</span> cc4 = 0
+
+    cc5 = ((c3 + c4) / 2) + (<span style="color: #88aaee;">RND</span> * k) - kp
+    <span style="color: #bb99ee;">IF</span> cc5 &gt; maxLightness <span style="color: #bb99ee;">THEN</span> cc5 = maxLightness
+    <span style="color: #bb99ee;">IF</span> cc5 &lt; 0 <span style="color: #bb99ee;">THEN</span> cc5 = 0
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the central lightness value</span>
+    cc1 = ((cc2 + cc3 + cc4 + cc5) / 4) + (<span style="color: #88aaee;">RND</span> * k) - kp
+    <span style="color: #bb99ee;">IF</span> cc1 &gt; maxLightness <span style="color: #bb99ee;">THEN</span> cc1 = maxLightness
+    <span style="color: #bb99ee;">IF</span> cc1 &lt; 0 <span style="color: #bb99ee;">THEN</span> cc1 = 0
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Set the calculated lightness values for the box</span>
+    <span style="color: #ee8899;">PSET</span> (x1 + sp, y1 + sp), cc1
+    <span style="color: #ee8899;">PSET</span> (x1 + sp, y1), cc2
+    <span style="color: #ee8899;">PSET</span> (x1, y1 + sp), cc3
+    <span style="color: #ee8899;">PSET</span> (x1 + s, y1 + sp), cc4
+    <span style="color: #ee8899;">PSET</span> (x1 + sp, y1 + s), cc5
+<span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">SUB</span>
+
+<span style="color: #bb99ee;">SUB</span> InitializeProgram
+    <span style="color: #666677;">' </span><span style="color: #666677;">Set the screen mode and initialize the color palette</span>
+    <span style="color: #ee8899;">SCREEN</span> 13
+    SetPalette
+    <span style="color: #ee8899;">RANDOMIZE</span> <span style="color: #ee8899;">TIMER</span>
+<span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">SUB</span>
+
+<span style="color: #bb99ee;">SUB</span> SetPalette
+    <span style="color: #666677;">' </span><span style="color: #666677;">Set the color palette for lightness levels</span>
+    <span style="color: #bb99ee;">FOR</span> a = 0 <span style="color: #bb99ee;">TO</span> 255
+        <span style="color: #ee8899;">OUT</span> &amp;H3C8, a
+        <span style="color: #ee8899;">OUT</span> &amp;H3C9, a / 4
+        <span style="color: #ee8899;">OUT</span> &amp;H3C9, a / 3
+        <span style="color: #ee8899;">OUT</span> &amp;H3C9, a / 2.3
+    <span style="color: #bb99ee;">NEXT</span> a
+<span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">SUB</span>
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-orgbf537cb" class="outline-2">
+<h2 id="orgbf537cb"><span class="section-number-2">3.</span> Old paper</h2>
+<div class="outline-text-2" id="text-3">
+<p class="responsive-img">
+<img src="Old paper.png" alt="Old paper.png" class="responsive-img" />
+<a href="Old paper.bas">Source code</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Program to render surface resembling old paper.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2025, Improved program readability</span>
+
+<span style="color: #bb99ee;">DEFINT</span> A-Z
+<span style="color: #ee8899;">SCREEN</span> 13
+<span style="color: #ee8899;">RANDOMIZE</span> <span style="color: #ee8899;">TIMER</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Initialize the color palette to grayscale. Each color index from 0 to 63 has R, G, B values equal to the index,</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">creating a smooth grayscale gradient for the 256-color mode.</span>
+<span style="color: #bb99ee;">FOR</span> paletteIndex = 0 <span style="color: #bb99ee;">TO</span> 63
+    <span style="color: #ee8899;">OUT</span> &amp;H3C8, paletteIndex
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, paletteIndex  <span style="color: #666677;">' </span><span style="color: #666677;">Set red component</span>
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, paletteIndex  <span style="color: #666677;">' </span><span style="color: #666677;">Set green component</span>
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, paletteIndex  <span style="color: #666677;">' </span><span style="color: #666677;">Set blue component</span>
+<span style="color: #bb99ee;">NEXT</span> paletteIndex
+
+noiseOffset = 0
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate a paper-like surface by averaging the color of the pixel above with some randomness.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This creates a procedural texture that mimics the roughness of paper.</span>
+<span style="color: #bb99ee;">FOR</span> y = 1 <span style="color: #bb99ee;">TO</span> 190
+    <span style="color: #bb99ee;">FOR</span> x = 1 <span style="color: #bb99ee;">TO</span> 310
+        stepCounter = stepCounter + 1
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Approximately every 10 steps, introduce a new random noise offset to create variation in the pattern.</span>
+        <span style="color: #666677;">' </span><span style="color: #666677;">This prevents the surface from becoming too uniform.</span>
+        <span style="color: #bb99ee;">IF</span> stepCounter &gt; 10 <span style="color: #bb99ee;">THEN</span>
+            noiseOffset = <span style="color: #88aaee;">RND</span> * currentColor / 20
+            stepCounter = stepCounter - (<span style="color: #88aaee;">RND</span> * 20 + 10)
+        <span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">IF</span>
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Get the color of the pixel directly above the current position.</span>
+        topColor = <span style="color: #88aaee;">POINT</span>(x, y - 1)
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the current color as the average of the top color and the previous current color,</span>
+        <span style="color: #666677;">' </span><span style="color: #666677;">plus a small random noise and minus the noise offset. This creates a smooth transition with</span>
+        <span style="color: #666677;">' </span><span style="color: #666677;">controlled randomness.</span>
+        currentColor = (topColor + currentColor) \ 2 + ((<span style="color: #88aaee;">RND</span> * 2) - noiseOffset)
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Clamp the color value to stay within the valid palette range (0 to 63).</span>
+        <span style="color: #bb99ee;">IF</span> currentColor &lt; 0 <span style="color: #bb99ee;">THEN</span> currentColor = 0
+        <span style="color: #bb99ee;">IF</span> currentColor &gt; 63 <span style="color: #bb99ee;">THEN</span> currentColor = 63
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Plot the current pixel at (x-1, y) using the calculated color.</span>
+        <span style="color: #ee8899;">PSET</span> (x - 1, y), currentColor
+    <span style="color: #bb99ee;">NEXT</span> x
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Set the starting color for the next row to the last calculated color of the current row.</span>
+    <span style="color: #666677;">' </span><span style="color: #666677;">This ensures continuity between rows.</span>
+    <span style="color: #ee8899;">PSET</span> (0, y + 1), currentColor
+<span style="color: #bb99ee;">NEXT</span> y
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for a single key press before exiting the program.</span>
+inputKey$ = <span style="color: #88aaee;">INPUT$</span>(1)
+
+<span style="color: #bb99ee;">SYSTEM</span>
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org0540284" class="outline-2">
+<h2 id="org0540284"><span class="section-number-2">4.</span> Wood</h2>
+<div class="outline-text-2" id="text-4">
+<p class="responsive-img">
+<img src="Wood.png" alt="Wood.png" class="responsive-img" />
+<a href="Wood.bas">Source code</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Program to render surface resembling wood.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024 - 2025, Improved program readability</span>
+
+<span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> DrawWoodSurface (woodX%, woodY%)
+<span style="color: #bb99ee;">DECLARE</span> <span style="color: #bb99ee;">SUB</span> DrawPaper (xPos%, y1Pos%)
+<span style="color: #bb99ee;">DEFINT</span> A-Z
+<span style="color: #ee8899;">SCREEN</span> 12
+<span style="color: #ee8899;">RANDOMIZE</span> <span style="color: #ee8899;">TIMER</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Set palette colors</span>
+<span style="color: #bb99ee;">FOR</span> colorIndex = 0 <span style="color: #bb99ee;">TO</span> 15
+    <span style="color: #ee8899;">OUT</span> &amp;H3C8, colorIndex
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, colorIndex * 4
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, colorIndex * 3
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, colorIndex * 0
+<span style="color: #bb99ee;">NEXT</span> colorIndex
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Main loop to draw wood at random positions</span>
+<span style="color: #eeaa77;">100</span>:
+woodX = <span style="color: #88aaee;">RND</span> * 400 + 200
+woodY = <span style="color: #88aaee;">RND</span> * 100 + 200
+<span style="color: #bb99ee;">CALL</span> DrawWoodSurface(woodX, woodY)
+<span style="color: #bb99ee;">GOTO</span> <span style="color: #eeaa77;">100</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for user input to exit</span>
+exitKey$ = <span style="color: #88aaee;">INPUT$</span>(1)
+
+<span style="color: #bb99ee;">SUB</span> DrawWoodSurface (woodX, woodY)
+    <span style="color: #bb99ee;">DIM</span> lowerY <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+    <span style="color: #bb99ee;">DIM</span> phaseOffset <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+    <span style="color: #bb99ee;">DIM</span> xStepCounter <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+    <span style="color: #bb99ee;">DIM</span> randomOffset <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+    <span style="color: #bb99ee;">DIM</span> newColor <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+    <span style="color: #bb99ee;">DIM</span> upperColor <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+    <span style="color: #bb99ee;">DIM</span> currentColor <span style="color: #bb99ee;">AS</span> <span style="color: #eeddaa;">INTEGER</span>
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw the outline of the wood</span>
+    lowerY = woodY + 1
+    <span style="color: #ee8899;">LINE</span> (0, 0)-(woodX, woodY), 0, BF  <span style="color: #666677;">' </span><span style="color: #666677;">Black background</span>
+    <span style="color: #ee8899;">LINE</span> (5, 5)-(woodX - 5, lowerY - 5), 8, BF  <span style="color: #666677;">' </span><span style="color: #666677;">Gray wood outline</span>
+    <span style="color: #ee8899;">LINE</span> (10, 10)-(woodX - 10, lowerY - 10), 15, BF  <span style="color: #666677;">' </span><span style="color: #666677;">White inner highlight</span>
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Initialize random phase offset for color variation</span>
+    phaseOffset = <span style="color: #88aaee;">RND</span> * 300
+
+    <span style="color: #666677;">' </span><span style="color: #666677;">Draw the wood texture</span>
+    <span style="color: #bb99ee;">FOR</span> y = woodY - 1 <span style="color: #bb99ee;">TO</span> 0 <span style="color: #bb99ee;">STEP</span> -1
+        <span style="color: #bb99ee;">FOR</span> x = woodX - 1 <span style="color: #bb99ee;">TO</span> 0 <span style="color: #bb99ee;">STEP</span> -1
+            xStepCounter = xStepCounter + 1
+            <span style="color: #bb99ee;">IF</span> xStepCounter &gt; woodX <span style="color: #bb99ee;">THEN</span>
+                randomOffset = <span style="color: #88aaee;">RND</span> * 13  <span style="color: #666677;">' </span><span style="color: #666677;">Small random noise for texture variation</span>
+                xStepCounter = <span style="color: #88aaee;">SIN</span>((y + phaseOffset) / 100) * woodX  <span style="color: #666677;">' </span><span style="color: #666677;">Sine wave to create wavy grain pattern</span>
+            <span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">IF</span>
+            upperColor = <span style="color: #88aaee;">POINT</span>(x, y + 1)  <span style="color: #666677;">' </span><span style="color: #666677;">Get color from upper pixel</span>
+            currentColor = <span style="color: #88aaee;">POINT</span>(x, y)    <span style="color: #666677;">' </span><span style="color: #666677;">Get color from current pixel</span>
+            newColor = (upperColor * 2 + currentColor + newColor * 3 + randomOffset) / 7 + <span style="color: #88aaee;">RND</span> * 1
+
+            <span style="color: #666677;">' </span><span style="color: #666677;">Ensure color value is within the valid range (0-15)</span>
+            <span style="color: #bb99ee;">IF</span> newColor &lt; 0 <span style="color: #bb99ee;">THEN</span> newColor = 0
+            <span style="color: #bb99ee;">IF</span> newColor &gt; 15 <span style="color: #bb99ee;">THEN</span> newColor = 15
+
+            <span style="color: #666677;">' </span><span style="color: #666677;">Set the pixel color for the wood texture</span>
+            <span style="color: #ee8899;">PSET</span> (x + 1, y), newColor
+        <span style="color: #bb99ee;">NEXT</span> x
+    <span style="color: #bb99ee;">NEXT</span> y
+
+<span style="color: #bb99ee;">END</span> <span style="color: #bb99ee;">SUB</span>
+</pre>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org4685bf9" class="outline-2">
+<h2 id="org4685bf9"><span class="section-number-2">5.</span> Yellow flame</h2>
+<div class="outline-text-2" id="text-5">
+<p class="responsive-img">
+<img src="Yellow flame.png" alt="Yellow flame.png" class="responsive-img" />
+<a href="Yellow flame.bas">Source code</a>
+</p>
+
+<div class="org-src-container">
+<pre class="src src-basic-qb45"><span style="color: #666677;">' </span><span style="color: #666677;">Yellow flame.</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">This program is free software: released under Creative Commons Zero (CC0) license</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">by Svjatoslav Agejenko.</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Email: svjatoslav@svjatoslav.eu</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Homepage: http://www.svjatoslav.eu</span>
+<span style="color: #666677;">'</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">Changelog:</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2003.12, Initial version</span>
+<span style="color: #666677;">' </span><span style="color: #666677;">2024.08, Improved program readability</span>
+
+
+<span style="color: #bb99ee;">DEFINT</span> A-Z <span style="color: #666677;">' </span><span style="color: #666677;">Define all variables as integers</span>
+<span style="color: #ee8899;">SCREEN</span> 13 <span style="color: #666677;">' </span><span style="color: #666677;">Set graphics mode to 320x200 with 256 colors</span>
+<span style="color: #ee8899;">RANDOMIZE</span> <span style="color: #ee8899;">TIMER</span> <span style="color: #666677;">' </span><span style="color: #666677;">Seed the random number generator</span>
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Initialize palette registers with sine wave colors</span>
+<span style="color: #bb99ee;">FOR</span> paletteIndex = 0 <span style="color: #bb99ee;">TO</span> 255
+    <span style="color: #ee8899;">OUT</span> &amp;H3C8, paletteIndex
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, <span style="color: #88aaee;">INT</span>(<span style="color: #88aaee;">SIN</span>(paletteIndex / 21) * 30 + 30)
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, <span style="color: #88aaee;">INT</span>(<span style="color: #88aaee;">SIN</span>(paletteIndex / 34) * 30 + 30)
+    <span style="color: #ee8899;">OUT</span> &amp;H3C9, <span style="color: #88aaee;">INT</span>(<span style="color: #88aaee;">SIN</span>(paletteIndex / 10) * 30 + 30)
+<span style="color: #bb99ee;">NEXT</span> paletteIndex
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Generate the surface pattern</span>
+<span style="color: #bb99ee;">FOR</span> y = 1 <span style="color: #bb99ee;">TO</span> 199
+    <span style="color: #bb99ee;">FOR</span> x = 1 <span style="color: #bb99ee;">TO</span> 319
+        prevPixel = <span style="color: #88aaee;">POINT</span>(x, y - 1)
+        leftPixel = <span style="color: #88aaee;">POINT</span>(x - 1, y)
+        diagPixel = <span style="color: #88aaee;">POINT</span>(x - 1, y - 1)
+        left2Pixel = <span style="color: #88aaee;">POINT</span>(x - 2, y)
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Calculate the average of surrounding pixels and add some randomness</span>
+        newColor = (prevPixel + leftPixel + diagPixel + left2Pixel) \ 4 + (<span style="color: #88aaee;">RND</span> * 5 - 2)
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Clamp the color value within the valid range</span>
+        <span style="color: #bb99ee;">IF</span> newColor &lt; 0 <span style="color: #bb99ee;">THEN</span> newColor = 0
+        <span style="color: #bb99ee;">IF</span> newColor &gt; 63 <span style="color: #bb99ee;">THEN</span> newColor = 63
+
+        <span style="color: #666677;">' </span><span style="color: #666677;">Set the pixel with the calculated color</span>
+        <span style="color: #ee8899;">PSET</span> (x, y), newColor
+    <span style="color: #bb99ee;">NEXT</span> x
+<span style="color: #bb99ee;">NEXT</span> y
+
+<span style="color: #666677;">' </span><span style="color: #666677;">Wait for user input to exit</span>
+userInput$ = <span style="color: #88aaee;">INPUT$</span>(1)
+</pre>
+</div>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2025-07-28 ma 03:32</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/2D GFX/Textures/index.org b/2D GFX/Textures/index.org
new file mode 100644
index 0000000..46e4c6c
--- /dev/null
+++ b/2D GFX/Textures/index.org	
@@ -0,0 +1,64 @@
+#+TITLE: Fractals
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+#+begin_export html
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+#+end_export
+
+* Circular waves
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Circular waves.png]]
+[[file:Circular waves.bas][Source code]]
+
+#+INCLUDE: "Circular waves.bas" src basic-qb45
+
+* Diamond square clouds
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Diamond square clouds.png]]
+[[file:Diamond square clouds.bas][Source code]]
+
+#+INCLUDE: "Diamond square clouds.bas" src basic-qb45
+
+* Old paper
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Old paper.png]]
+[[file:Old paper.bas][Source code]]
+
+#+INCLUDE: "Old paper.bas" src basic-qb45
+
+* Wood
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Wood.png]]
+[[file:Wood.bas][Source code]]
+
+#+INCLUDE: "Wood.bas" src basic-qb45
+
+* Yellow flame
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Yellow flame.png]]
+[[file:Yellow flame.bas][Source code]]
+
+#+INCLUDE: "Yellow flame.bas" src basic-qb45
diff --git a/2D GFX/Textures/logo.png b/2D GFX/Textures/logo.png
new file mode 100644
index 0000000..0d41afb
Binary files /dev/null and b/2D GFX/Textures/logo.png differ
diff --git a/2D GFX/Truncated cone.bas b/2D GFX/Truncated cone.bas
new file mode 100755
index 0000000..aafae4f
--- /dev/null
+++ b/2D GFX/Truncated cone.bas	
@@ -0,0 +1,73 @@
+' Program that draws truncated cone:
+' - Top Part: A cylinder (with diagonal hatching).
+' - Middle Part: A frustum (truncated cone) – it widens from the bottom cylinder to the top cylinder.
+' - Bottom Part: A smaller cylinder.
+'
+' Goal of this program is to test viability of programming/code to generate images of 3D shapes.
+'
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2000, Initial version
+' 2024 - 2025, Improved program readability
+
+
+DECLARE SUB DrawLine (x%, y%, l%, clr%)
+
+DEFINT A-Z
+SCREEN 12
+
+' Set up the palette
+FOR a = 0 TO 16
+    OUT &H3C8, a
+    OUT &H3C9, a * 4
+    OUT &H3C9, a * 4
+    OUT &H3C9, a * 4
+NEXT
+
+' Draw the pattern
+FOR x = 0 TO 200
+    y = SQR((200 - x) * x) / 2
+    DrawLine x + 200, y + 200, y * 2, t
+    LINE (x + 200, y + 202)-(x + 200, y + 250), t
+    IF x < 195 THEN
+        LINE (300 + ((x - 100) / 2), y / 2 + 328)-(x + 200, y + 252), t
+    END IF
+    LINE (300 + ((x - 100) / 2), y / 2 + 330)-(300 + ((x - 100) / 2), y / 2 + 370), t
+NEXT x
+
+SUB DrawLine (x, y, l, clr)
+    ' Calculate the initial color value
+    c = 650 - y - x
+
+    ' Adjust color to be within a specific range
+1   IF c > 30 THEN
+        c = c - 30
+        GOTO 1
+    END IF
+
+    clr = c
+    IF clr > 15 THEN
+        clr = 30 - clr
+    END IF
+
+    ' Draw a vertical line with varying colors
+    FOR y1 = y TO y - l STEP -1
+        c1 = c
+        IF c1 > 15 THEN
+            c1 = 30 - c1
+        END IF
+
+        PSET (x, y1), c1
+
+        ' Increment the color and wrap around if necessary
+        c = c + 1
+        IF c > 30 THEN
+            c = c - 30
+        END IF
+    NEXT y1
+END SUB
diff --git a/2D GFX/Truncated cone.png b/2D GFX/Truncated cone.png
new file mode 100644
index 0000000..d2df067
Binary files /dev/null and b/2D GFX/Truncated cone.png differ
diff --git a/3D GFX/3D Synthezier/.project b/3D GFX/3D Synthezier/.project
new file mode 100644
index 0000000..969bddf
--- /dev/null
+++ b/3D GFX/3D Synthezier/.project	
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>3dSynthezier</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+	</buildSpec>
+	<natures>
+	</natures>
+</projectDescription>
diff --git a/3D GFX/3D Synthezier/bin/3dparse.bas b/3D GFX/3D Synthezier/bin/3dparse.bas
new file mode 100755
index 0000000..ad6f74c
--- /dev/null
+++ b/3D GFX/3D Synthezier/bin/3dparse.bas	
@@ -0,0 +1,614 @@
+' Program that parses special programmable 3D scene description language
+' and generates from it 3D objects in Wavefront .obj format.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' ?, Initial version
+' 2024, Improved program readability
+
+' Before running, make sure include path is correct. See below.
+
+DECLARE SUB parsel (a$)
+DECLARE SUB stat2 (b!)
+DECLARE SUB stat ()
+DECLARE SUB getchc (a$, b!)
+DECLARE SUB start ()
+DECLARE SUB qui ()
+DECLARE SUB flushpoly (a!)
+DECLARE SUB usemtl (a$)
+DECLARE SUB flushp ()
+DECLARE SUB parse (a$)
+DECLARE SUB geth (b!)
+DECLARE SUB cmd (a$)
+DECLARE SUB getson (a$)
+
+DIM SHARED px(1 TO 1000)
+DIM SHARED py(1 TO 1000)
+DIM SHARED pz(1 TO 1000)
+DIM SHARED nump
+DIM SHARED numpa
+DIM SHARED numpo
+
+DIM SHARED fil(1 TO 100)
+DIM SHARED mitus
+DIM SHARED sona$(1 TO 20)
+DIM SHARED res
+
+DIM SHARED mtlm
+DIM SHARED mtl$(1 TO 50)
+DIM SHARED mtlp1(1 TO 50, 1 TO 100)
+DIM SHARED mtlp2(1 TO 50, 1 TO 100)
+DIM SHARED mtlp3(1 TO 50, 1 TO 100)
+DIM SHARED mtlp4(1 TO 50, 1 TO 100)
+DIM SHARED mtll(1 TO 50)
+DIM SHARED cmtl
+
+DIM SHARED stkf(1 TO 500)
+DIM SHARED stks(1 TO 500)
+DIM SHARED stkp
+DIM SHARED fc
+DIM SHARED ipath$
+
+DIM SHARED chc$(1 TO 10, 1 TO 500)
+DIM SHARED chcl(1 TO 10)
+DIM SHARED chcf$(1 TO 10)
+DIM SHARED chct(1 TO 10)
+DIM SHARED chctim
+DIM SHARED mtmprs
+DIM SHARED tmr
+
+DIM SHARED var$(0 TO 100)
+DIM SHARED flag(1 TO 50, 0 TO 9)
+DIM SHARED cstatt
+DIM SHARED cstatm
+
+' Path to include resources from. Adjust according to your installation!
+ipath$ = "C:\GRAPHICS\3D\3DSYNT~1\INCLUDE\"
+
+start
+
+IF COMMAND$ = "" THEN END
+CLS
+
+cmd "obj ~" + COMMAND$
+qui
+CLOSE #res
+fil(res) = 0
+
+PRINT "done"
+SYSTEM
+
+SUB cmd (z$)
+    a$ = z$
+    IF LEFT$(a$, 1) = "?" THEN
+        IF flag(mtmprs, VAL(RIGHT$(LEFT$(a$, 2), 1))) = 1 THEN
+            a$ = RIGHT$(a$, LEN(a$) - 3)
+        ELSE
+            GOTO 10
+        END IF
+    END IF
+
+    getson a$
+
+    SELECT CASE sona$(1)
+        CASE "end"
+            qui
+            PRINT "terminated from file"
+            SYSTEM
+
+        CASE "warn"
+            COLOR 12
+            PRINT sona$(2)
+            COLOR 7
+            b$ = INPUT$(1)
+
+        CASE "p"
+            nump = nump + 1
+            numpa = numpa + 1
+            x = VAL(sona$(2))
+            y = VAL(sona$(3))
+            z = VAL(sona$(4))
+
+            ' Transform the coordinates based on the stack
+            FOR b = stkp TO 1 STEP -1
+                SELECT CASE stkf(b)
+                    CASE 1
+                        c1 = SIN(stks(b) / fc)
+                        s1 = COS(stks(b) / fc)
+                        z1 = x * c1 + z * s1
+                        x1 = x * s1 - z * c1
+                        x = x1
+                        z = z1
+
+                    CASE 2
+                        c1 = SIN(stks(b) / fc)
+                        s1 = COS(stks(b) / fc)
+                        z1 = y * c1 + z * s1
+                        y1 = y * s1 - z * c1
+                        y = y1
+                        z = z1
+
+                    CASE 3
+                        s1 = SIN(stks(b) / fc)
+                        c1 = COS(stks(b) / fc)
+                        y1 = y * c1 + x * s1
+                        x1 = y * s1 - x * c1
+                        x = x1
+                        y = y1
+
+                    CASE 10
+                        x = x + stks(b)
+
+                    CASE 11
+                        y = y + stks(b)
+
+                    CASE 12
+                        z = z + stks(b)
+
+                    CASE 20
+                        x = x - stks(b)
+
+                    CASE 21
+                        y = y - stks(b)
+
+                    CASE 22
+                        z = z - stks(b)
+
+                    CASE 30
+                        x = x * stks(b)
+
+                    CASE 31
+                        y = y * stks(b)
+
+                    CASE 32
+                        z = z * stks(b)
+                END SELECT
+            NEXT b
+
+            ' Store the transformed coordinates
+            px(nump) = x
+            py(nump) = y
+            pz(nump) = z
+
+            IF nump > 900 THEN flushp
+
+        CASE "here"
+            numpo = numpa
+
+        CASE "mtl"
+            usemtl sona$(2)
+
+        CASE "mtlrnd"
+            b = INT(RND * (mitus - 1)) + 2
+            usemtl sona$(b)
+
+        CASE "f"
+            IF mtll(cmtl) > 90 THEN flushpoly cmtl
+            b = mtll(cmtl)
+            b = b + 1
+            mtll(cmtl) = b
+            mtlp1(cmtl, b) = VAL(sona$(2)) + numpo
+            mtlp2(cmtl, b) = VAL(sona$(3)) + numpo
+            mtlp3(cmtl, b) = VAL(sona$(4)) + numpo
+
+            ' Handle the optional fourth vertex
+            IF sona$(5) = "" THEN
+                mtlp4(cmtl, b) = -32000
+            ELSE
+                mtlp4(cmtl, b) = VAL(sona$(5)) + numpo
+            END IF
+
+        CASE "obj"
+            d = stkp
+
+            ' Parse the transformation stack
+            FOR a = mitus TO 3 STEP -1
+                b$ = LEFT$(sona$(a), 2)
+                c = VAL(RIGHT$(sona$(a), LEN(sona$(a)) - 2))
+                stkp = stkp + 1
+                stks(stkp) = c
+
+                SELECT CASE b$
+                    CASE "xz"
+                        stkf(stkp) = 1
+
+                    CASE "yz"
+                        stkf(stkp) = 2
+
+                    CASE "xy"
+                        stkf(stkp) = 3
+
+                    CASE "x+"
+                        stkf(stkp) = 10
+
+                    CASE "y+"
+                        stkf(stkp) = 11
+
+                    CASE "z+"
+                        stkf(stkp) = 12
+
+                    CASE "x-"
+                        stkf(stkp) = 20
+
+                    CASE "y-"
+                        stkf(stkp) = 21
+
+                    CASE "z-"
+                        stkf(stkp) = 22
+
+                    CASE "x*"
+                        stkf(stkp) = 30
+
+                    CASE "y*"
+                        stkf(stkp) = 31
+
+                    CASE "z*"
+                        stkf(stkp) = 32
+                END SELECT
+            NEXT a
+
+            ' Process the object command
+            a$ = sona$(2)
+            mtmprs = mtmprs + 1
+            cstatt = cstatt + 1
+
+            LOCATE 10 + mtmprs, 1
+            PRINT a$
+
+            ' Read and execute the next command
+            getchc a$, b
+            c = 1
+
+2
+                d$ = chc$(b, c)
+                cmd d$
+
+                ' Check if the current command matches the expected one
+                IF chcf$(b) <> a$ THEN
+                    getchc a$, b
+                END IF
+
+                c = c + 1
+
+                ' Continue reading and executing commands until the stack is empty
+                IF c <= chcl(b) THEN GOTO 2
+
+            tmr = tmr + 1
+
+            ' If more than 20 commands have been processed, update statistics
+            IF tmr > 20 THEN
+                tmr = 0
+                stat
+            END IF
+
+            LOCATE 10 + mtmprs, 1
+            PRINT SPACE$(LEN(a$))
+
+            ' Decrement the command parser stack
+            mtmprs = mtmprs - 1
+
+            stkp = d
+
+        CASE "#"
+
+        CASE "out"
+            geth res
+            OPEN sona$(2) + ".obj" FOR OUTPUT AS #res
+            PRINT #res, "mtllib result.mtl"
+
+        CASE "rnd"
+            b = INT(RND * (mitus - 1)) + 2
+            c$ = sona$(b)
+
+            ' Replace caret characters with spaces
+            f$ = ""
+            FOR d = 1 TO LEN(c$)
+                e$ = RIGHT$(LEFT$(c$, d), 1)
+                IF e$ = "^" THEN
+                    e$ = " "
+                END IF
+                f$ = f$ + e$
+            NEXT d
+
+            cmd f$
+
+        CASE "set"
+            var$(VAL(sona$(2))) = sona$(3)
+
+        CASE "cmp"
+            ' Compare two strings
+            IF sona$(3) = sona$(4) THEN
+                b = 1
+            ELSE
+                b = 0
+            END IF
+
+            ' Store the comparison result in the flag array
+            flag(mtmprs, VAL(sona$(2))) = b
+
+    END SELECT
+
+10
+END SUB
+
+SUB flushp
+
+    FOR a = 1 TO nump
+        PRINT #res, "v " + STR$(px(a)) + " " + STR$(py(a)) + " " + STR$(-pz(a))
+    NEXT a
+
+    nump = 0
+
+END SUB
+
+SUB flushpoly (a)
+
+    IF mtll(a) = 0 THEN GOTO 5
+
+    ' Write the material usage line
+    PRINT #res, "usemtl " + mtl$(a)
+
+    ' Write the face definitions
+    FOR b = 1 TO mtll(a)
+        c$ = "f " + STR$(mtlp1(a, b) + 1) + STR$(mtlp2(a, b) + 1) + STR$(mtlp3(a, b) + 1)
+
+        ' Handle the optional fourth vertex
+        IF mtlp4(a, b) <> -32000 THEN
+            c$ = c$ + STR$(mtlp4(a, b) + 1)
+        END IF
+
+        PRINT #res, c$
+    NEXT b
+    mtll(a) = 0
+
+5
+END SUB
+
+SUB getchc (a$, b!)
+
+    ' Search for the command in the cache
+    FOR c = 1 TO 10
+        IF chcf$(c) = a$ THEN
+            b = c
+            GOTO 6
+        END IF
+    NEXT c
+
+    ' Find the least recently used entry in the cache
+    d = 32000
+    FOR c = 1 TO 10
+        IF chct(c) < d THEN
+            d = chct(c)
+            e = c
+        END IF
+    NEXT c
+
+    ' Load the command file
+    g = 0
+    geth f
+
+    cstatm = cstatm + 1
+    b$ = a$
+
+    ' Remove leading tilde if present
+    IF LEFT$(b$, 1) = "~" THEN
+        b$ = RIGHT$(b$, LEN(b$) - 1)
+    ELSE
+        b$ = ipath$ + b$
+    END IF
+
+   
+    PRINT "File:" + b$
+    OPEN b$ + ".3d" FOR INPUT AS #f
+
+8
+
+    ' Read commands from the file until EOF
+    IF EOF(f) <> 0 THEN GOTO 7
+
+    LINE INPUT #f, c$
+
+    ' Skip empty lines
+    IF (LEFT$(c$, 1) <> "#") AND (c$ <> SPACE$(LEN(c$))) THEN
+        g = g + 1
+        chc$(e, g) = c$
+    END IF
+
+    GOTO 8
+
+7
+
+    ' Close the file and update statistics
+    CLOSE #f
+    fil(f) = 0
+    chcl(e) = g
+
+    b = e
+    chcf$(e) = a$
+
+    stat
+
+6
+
+    ' Update the cache timestamps
+    chctim = chctim + 1
+    chct(b) = chctim
+
+    ' If the cache is full, halve all timestamps
+    IF chctim > 10000 THEN
+        FOR c = 1 TO 10
+            chct(c) = chct(c) / 2
+        NEXT c
+
+        chctim = chctim / 2
+    END IF
+END SUB
+
+SUB geth (b!)
+
+    ' Find an unused file handle
+    FOR a = 1 TO 100
+        IF fil(a) = 0 THEN
+            fil(a) = 1
+            b = a
+            GOTO 1
+        END IF
+    NEXT a
+
+1
+END SUB
+
+SUB getson (a$)
+
+    ' Prepare the sona array for parsing
+    b$ = a$ + " "
+
+    FOR a = 1 TO 20
+        sona$(a) = ""
+    NEXT a
+
+    mitus = 0
+
+    e = 1
+
+    ' Parse the input string
+    FOR c = 1 TO LEN(b$)
+        d$ = RIGHT$(LEFT$(b$, c), 1)
+
+        IF d$ = " " OR d$ = CHR$(9) THEN
+            e = 1
+        ELSE
+            IF e = 1 THEN
+                mitus = mitus + 1
+            END IF
+
+            sona$(mitus) = sona$(mitus) + d$
+            e = 0
+        END IF
+    NEXT c
+
+    ' Replace variable names with their values
+    FOR c = 1 TO mitus
+        IF LEFT$(sona$(c), 1) = "%" THEN
+            sona$(c) = var$(VAL(RIGHT$(sona$(c), LEN(sona$(c)) - 1)))
+        END IF
+    NEXT c
+END SUB
+
+SUB qui
+
+    ' Flush the vertex buffer and write all polygons
+    flushp
+
+    FOR a = 1 TO mtlm
+        flushpoly a
+    NEXT a
+
+    stat
+END SUB
+
+SUB start
+
+    RANDOMIZE TIMER
+
+    ' Initialize arrays
+    FOR a = 1 TO 50
+        FOR b = 0 TO 9
+            flag(a, b) = 0
+        NEXT b
+    NEXT a
+
+    FOR a = 0 TO 100
+        var$(a) = ""
+    NEXT a
+
+    ' Initialize command cache
+    FOR a = 1 TO 10
+        FOR b = 1 TO 500
+            chc$(a, b) = ""
+        NEXT b
+
+        chcl(a) = 0
+        chcf$(a) = ""
+        chct(a) = 0
+    NEXT a
+
+    ' Initialize material lists
+    FOR a = 1 TO 50
+        mtll(a) = 0
+    NEXT a
+
+    ' Initialize file handles
+    FOR a = 1 TO 100
+        fil(a) = 0
+    NEXT a
+
+    nump = 0
+    numpa = 0
+    numpo = 0
+    mtlm = 0
+    stkp = 0
+    fc = 180 / 3.141285
+    chctim = 0
+    mtmprs = 0
+    cstatt = 0
+    cstatm = 0
+END SUB
+
+SUB stat
+
+    ' Display statistics
+    LOCATE 1, 1
+
+    FOR a = 1 TO 10
+        PRINT a, chcf$(a), chct(a), chcl(a)
+    NEXT a
+
+    COLOR 10
+
+    LOCATE 1, 50
+    PRINT cstatt; "parsed"
+
+    LOCATE 2, 50
+    PRINT cstatm; "cache miss"
+
+    LOCATE 3, 50
+    PRINT INT(cstatm / cstatt * 100); "% cache miss  "
+
+    COLOR 7
+END SUB
+
+SUB stat2 (b!)
+
+    ' Display the contents of a specific command cache
+    CLS
+
+    FOR a = 1 TO chcl(b)
+        PRINT chc$(b, a)
+    NEXT a
+
+    c$ = INPUT$(1)
+END SUB
+
+SUB usemtl (a$)
+
+    ' Find the material in the list
+    FOR b = 1 TO mtlm
+        IF mtl$(b) = a$ THEN
+            cmtl = b
+            GOTO 4
+        END IF
+    NEXT b
+
+    ' If not found, add it to the list
+    mtlm = mtlm + 1
+    mtl$(mtlm) = a$
+    cmtl = mtlm
+
+4
+END SUB
+
diff --git a/3D GFX/3D Synthezier/bin/city1.3d b/3D GFX/3D Synthezier/bin/city1.3d
new file mode 100644
index 0000000..04279fa
--- /dev/null
+++ b/3D GFX/3D Synthezier/bin/city1.3d	
@@ -0,0 +1,46 @@
+# small city block
+
+out city1
+
+obj maja xz90
+obj maja xz90 x+48
+obj maja xz90 x+96
+obj maja x+36 z-84
+
+# korgel olevad autod
+obj cars x+25
+obj cars x+27 z-50
+obj cars x+26 z-25 y-10
+obj cars x+25 z-40 y-20
+
+obj cars x+73 z-25 y+1
+obj cars x+75 z-50 y-2
+obj cars xz-90 z-60
+obj cars xz-90 z-62 x+50
+obj cars xz-90 z+60 x+1
+obj cars xz-90 z+61 x+52
+
+obj cars x+121 z-100 y+1
+obj cars x+122 z-70 y-5
+obj cars x+123 y+2
+obj cars x+122 z-38 y-2
+
+# allpool olevad autod
+obj cars x+25 y-30
+obj cars x+27 z-50 y-50
+obj cars x+26 z-25 y-40
+obj cars x+25 z-40 y-50
+
+obj cars x+73 z-25 y-34
+obj cars x+75 z-50 y-36
+obj cars xz-90 z-60 y-43
+obj cars xz-90 z-62 x+50 y-29
+obj cars xz-90 z+60 x+1 y-37
+obj cars xz-90 z+61 x+52 y-33
+
+obj cars x+121 z-100 y-41
+obj cars x+122 z-70 y-45
+obj cars x+123 y-32
+obj cars x+122 z-38 y-34
+
+
diff --git a/3D GFX/3D Synthezier/bin/city1.bat b/3D GFX/3D Synthezier/bin/city1.bat
new file mode 100755
index 0000000..d4fb06e
--- /dev/null
+++ b/3D GFX/3D Synthezier/bin/city1.bat	
@@ -0,0 +1,6 @@
+@echo off
+
+rem  This script will instruct generator to make "city1".
+rem  Note: When specifying source file, avoid extension. 
+
+qb /RUN 3dparse.bas /CMD city1
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/bin/city2.3d b/3D GFX/3D Synthezier/bin/city2.3d
new file mode 100644
index 0000000..8215a3e
--- /dev/null
+++ b/3D GFX/3D Synthezier/bin/city2.3d	
@@ -0,0 +1,45 @@
+# Big city, be prepared to wait ~10 min, on P133.
+
+out city2
+obj blk4 y-145
+obj blk4 y-116
+obj blk4 y-87
+obj blk4 y-58
+obj blk4 y-29
+obj blk4
+
+mtl kivi
+obj ring x*20 z*20 y+26
+mtl glass_transp
+obj kuppel x*20 z*20 y*10 y+26
+
+mtl kivi
+obj ring x*20 z*20 y+26 z+64.6412
+mtl glass_transp
+obj kuppel x*20 z*20 y*10 y+26 z+64.6412
+
+mtl kivi
+obj ring x*20 z*20 y+26 x+55.9809 z+32.3206
+mtl glass_transp
+obj kuppel x*20 z*20 y*10 y+26 x+55.9809 z+32.3206
+
+mtl kivi
+obj ring x*20 z*20 y+26 x+55.9809 z-32.3206
+mtl glass_transp
+obj kuppel x*20 z*20 y*10 y+26 x+55.9809 z-32.3206
+
+mtl kivi
+obj ring x*20 z*20 y+26 z-64.6412
+mtl glass_transp
+obj kuppel x*20 z*20 y*10 y+26 z-64.6412
+
+mtl kivi
+obj ring x*20 z*20 y+26 x-55.9809 z-32.3206
+mtl glass_transp
+obj kuppel x*20 z*20 y*10 y+26 x-55.9809 z-32.3206
+
+mtl kivi
+obj ring x*20 z*20 y+26 x-55.9809 z+32.3206
+mtl glass_transp
+obj kuppel x*20 z*20 y*10 y+26 x-55.9809 z+32.3206
+
diff --git a/3D GFX/3D Synthezier/bin/city2.bat b/3D GFX/3D Synthezier/bin/city2.bat
new file mode 100755
index 0000000..6aa7f5a
--- /dev/null
+++ b/3D GFX/3D Synthezier/bin/city2.bat	
@@ -0,0 +1,6 @@
+@echo off
+
+rem  This script will instruct generator to make "city2".
+rem  Note: When specifying source file, avoid extension. 
+
+qb /RUN 3dparse.bas /CMD city2
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/bin/result.mtl b/3D GFX/3D Synthezier/bin/result.mtl
new file mode 100644
index 0000000..9d689f1
--- /dev/null
+++ b/3D GFX/3D Synthezier/bin/result.mtl	
@@ -0,0 +1,108 @@
+# Wavefront material file
+# Must be in the same directory with parsed modules.
+
+newmtl default
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.4 0.4 0.4
+	Ks 0.7 0.7 0.7
+	Ka 0.3 0.3 0.3
+
+newmtl muld
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.247843 0.17098 0.158431
+	Ks 0 0 0
+	Ka 0.185882 0.128235 0.118824
+
+newmtl kivi
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.24935 0.216378 0.24935
+	Ks 0 0 0
+	Ka 0.128955 0.111903 0.128955
+
+newmtl klaastume
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.139608 0.0313726 0.108235
+	Ks 1.6633 0.373775 1.28952
+	Ka 0.104706 0.0235294 0.0811765
+
+newmtl klaashele
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.0925798 0.104637 0.109804
+	Ks 3.54381 4.00533 4.20313
+	Ka 0.737332 0.833356 0.87451
+
+newmtl seintellis
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.476309 0.432511 0.0875971
+	Ks 0 0 0
+	Ka 0.0642215 0.058316 0.0118108
+
+newmtl pronks
+	Ns 4
+	d 1
+	illum 2
+	Kd 0.238431 0.148435 0.0584391
+	Ks 0.636863 0.396478 0.156094
+	Ka 0.0627451 0.0390619 0.0153787
+
+newmtl solar
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.189927 0.10519 0.745098
+	Ks 1.27451 0.705882 5
+	Ka 0.0609766 0.0337716 0.239216
+
+newmtl metal_yellow
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.619608 0.619608 0
+	Ks 3.01563 3.01563 0
+	Ka 0.3 0.3 0
+
+newmtl metal_blue
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.243137 0.243137 0.666667
+	Ks 0.695221 0.695221 1.90625
+	Ka 0.109412 0.109412 0.3
+
+newmtl light_red
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.443137 0 0
+	Ks 3.8125 0 0
+	Ka 0.3 0 0
+
+
+newmtl light_white
+	Ns 32
+	d 1
+	illum 2
+	Kd 0.497347 0.528135 0.603922
+	Ks 2.35478 2.50055 2.85938
+	Ka 0.247059 0.262353 0.3
+
+newmtl glass_transp
+	Ns 39
+	d 0.572549
+	illum 2
+	Kd 0.129412 0.427451 0.776471
+	Ks 0.129412 0.427451 0.776471
+	Ka 0.000985995 0.00325677 0.00591597
+
diff --git a/3D GFX/3D Synthezier/doc/hexagonal city, 1.jpeg b/3D GFX/3D Synthezier/doc/hexagonal city, 1.jpeg
new file mode 100644
index 0000000..7d724be
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/hexagonal city, 1.jpeg differ
diff --git a/3D GFX/3D Synthezier/doc/hexagonal city, 2.jpeg b/3D GFX/3D Synthezier/doc/hexagonal city, 2.jpeg
new file mode 100644
index 0000000..16d56a5
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/hexagonal city, 2.jpeg differ
diff --git a/3D GFX/3D Synthezier/doc/hexagonal city, 3.jpeg b/3D GFX/3D Synthezier/doc/hexagonal city, 3.jpeg
new file mode 100644
index 0000000..0d7fb88
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/hexagonal city, 3.jpeg differ
diff --git a/3D GFX/3D Synthezier/doc/hexagonal city.blend b/3D GFX/3D Synthezier/doc/hexagonal city.blend
new file mode 100644
index 0000000..6ab7003
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/hexagonal city.blend differ
diff --git a/3D GFX/3D Synthezier/doc/index.html b/3D GFX/3D Synthezier/doc/index.html
new file mode 100644
index 0000000..8066d7a
--- /dev/null
+++ b/3D GFX/3D Synthezier/doc/index.html	
@@ -0,0 +1,1573 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2025-07-28 ma 03:33 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>3D Synthezier</title>
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
+  .subtitle { text-align: center;
+              font-size: medium;
+              font-weight: bold;
+              margin-top:0; }
+  .todo   { font-family: monospace; color: red; }
+  .done   { font-family: monospace; color: green; }
+  .priority { font-family: monospace; color: orange; }
+  .tag    { background-color: #eee; font-family: monospace;
+            padding: 2px; font-size: 80%; font-weight: normal; }
+  .timestamp { color: #bebebe; }
+  .timestamp-kwd { color: #5f9ea0; }
+  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
+  .org-left   { margin-left: 0px;  margin-right: auto; text-align: left; }
+  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #e6e6e6;
+    border-radius: 3px;
+    background-color: #f2f2f2;
+    padding: 8pt;
+    font-family: monospace;
+    overflow: auto;
+    margin: 1.2em;
+  }
+  pre.src {
+    position: relative;
+    overflow: auto;
+  }
+  pre.src:before {
+    display: none;
+    position: absolute;
+    top: -8px;
+    right: 12px;
+    padding: 3px;
+    color: #555;
+    background-color: #f2f2f299;
+  }
+  pre.src:hover:before { display: inline; margin-top: 14px;}
+  /* Languages per Org manual */
+  pre.src-asymptote:before { content: 'Asymptote'; }
+  pre.src-awk:before { content: 'Awk'; }
+  pre.src-authinfo::before { content: 'Authinfo'; }
+  pre.src-C:before { content: 'C'; }
+  /* pre.src-C++ doesn't work in CSS */
+  pre.src-clojure:before { content: 'Clojure'; }
+  pre.src-css:before { content: 'CSS'; }
+  pre.src-D:before { content: 'D'; }
+  pre.src-ditaa:before { content: 'ditaa'; }
+  pre.src-dot:before { content: 'Graphviz'; }
+  pre.src-calc:before { content: 'Emacs Calc'; }
+  pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
+  pre.src-fortran:before { content: 'Fortran'; }
+  pre.src-gnuplot:before { content: 'gnuplot'; }
+  pre.src-haskell:before { content: 'Haskell'; }
+  pre.src-hledger:before { content: 'hledger'; }
+  pre.src-java:before { content: 'Java'; }
+  pre.src-js:before { content: 'Javascript'; }
+  pre.src-latex:before { content: 'LaTeX'; }
+  pre.src-ledger:before { content: 'Ledger'; }
+  pre.src-lisp:before { content: 'Lisp'; }
+  pre.src-lilypond:before { content: 'Lilypond'; }
+  pre.src-lua:before { content: 'Lua'; }
+  pre.src-matlab:before { content: 'MATLAB'; }
+  pre.src-mscgen:before { content: 'Mscgen'; }
+  pre.src-ocaml:before { content: 'Objective Caml'; }
+  pre.src-octave:before { content: 'Octave'; }
+  pre.src-org:before { content: 'Org mode'; }
+  pre.src-oz:before { content: 'OZ'; }
+  pre.src-plantuml:before { content: 'Plantuml'; }
+  pre.src-processing:before { content: 'Processing.js'; }
+  pre.src-python:before { content: 'Python'; }
+  pre.src-R:before { content: 'R'; }
+  pre.src-ruby:before { content: 'Ruby'; }
+  pre.src-sass:before { content: 'Sass'; }
+  pre.src-scheme:before { content: 'Scheme'; }
+  pre.src-screen:before { content: 'Gnu Screen'; }
+  pre.src-sed:before { content: 'Sed'; }
+  pre.src-sh:before { content: 'shell'; }
+  pre.src-sql:before { content: 'SQL'; }
+  pre.src-sqlite:before { content: 'SQLite'; }
+  /* additional languages in org.el's org-babel-load-languages alist */
+  pre.src-forth:before { content: 'Forth'; }
+  pre.src-io:before { content: 'IO'; }
+  pre.src-J:before { content: 'J'; }
+  pre.src-makefile:before { content: 'Makefile'; }
+  pre.src-maxima:before { content: 'Maxima'; }
+  pre.src-perl:before { content: 'Perl'; }
+  pre.src-picolisp:before { content: 'Pico Lisp'; }
+  pre.src-scala:before { content: 'Scala'; }
+  pre.src-shell:before { content: 'Shell Script'; }
+  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
+  /* additional language identifiers per "defun org-babel-execute"
+       in ob-*.el */
+  pre.src-cpp:before  { content: 'C++'; }
+  pre.src-abc:before  { content: 'ABC'; }
+  pre.src-coq:before  { content: 'Coq'; }
+  pre.src-groovy:before  { content: 'Groovy'; }
+  /* additional language identifiers from org-babel-shell-names in
+     ob-shell.el: ob-shell is the only babel language using a lambda to put
+     the execution function name together. */
+  pre.src-bash:before  { content: 'bash'; }
+  pre.src-csh:before  { content: 'csh'; }
+  pre.src-ash:before  { content: 'ash'; }
+  pre.src-dash:before  { content: 'dash'; }
+  pre.src-ksh:before  { content: 'ksh'; }
+  pre.src-mksh:before  { content: 'mksh'; }
+  pre.src-posh:before  { content: 'posh'; }
+  /* Additional Emacs modes also supported by the LaTeX listings package */
+  pre.src-ada:before { content: 'Ada'; }
+  pre.src-asm:before { content: 'Assembler'; }
+  pre.src-caml:before { content: 'Caml'; }
+  pre.src-delphi:before { content: 'Delphi'; }
+  pre.src-html:before { content: 'HTML'; }
+  pre.src-idl:before { content: 'IDL'; }
+  pre.src-mercury:before { content: 'Mercury'; }
+  pre.src-metapost:before { content: 'MetaPost'; }
+  pre.src-modula-2:before { content: 'Modula-2'; }
+  pre.src-pascal:before { content: 'Pascal'; }
+  pre.src-ps:before { content: 'PostScript'; }
+  pre.src-prolog:before { content: 'Prolog'; }
+  pre.src-simula:before { content: 'Simula'; }
+  pre.src-tcl:before { content: 'tcl'; }
+  pre.src-tex:before { content: 'TeX'; }
+  pre.src-plain-tex:before { content: 'Plain TeX'; }
+  pre.src-verilog:before { content: 'Verilog'; }
+  pre.src-vhdl:before { content: 'VHDL'; }
+  pre.src-xml:before { content: 'XML'; }
+  pre.src-nxml:before { content: 'XML'; }
+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
+  caption.t-above { caption-side: top; }
+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
+  th.org-left   { text-align: center;   }
+  th.org-center { text-align: center; }
+  td.org-right  { text-align: right;  }
+  td.org-left   { text-align: left;   }
+  td.org-center { text-align: center; }
+  dt { font-weight: bold; }
+  .footpara { display: inline; }
+  .footdef  { margin-bottom: 1em; }
+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
+  .org-info-js_info-navigation { border-style: none; }
+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
+<style type="text/css">
+* {    border-color: #657b83;}a {    color: #268bd2 !important;}a:visited {    color: #6c71c4 !important;}body {    background-color: #002b36 !important;    color: #839496 !important;    font-family: Libre Baskerville, serif;}html {    background-color: #002b36 !important;}input,textarea {    background-color: #073642 !important;    color: #839496 !important;}blockquote,code,pre {    background-color: #073642 !important;    border: 1px solid #094352 !important;    border-radius: 2px;    box-shadow: none;    color: #839496 !important;}code {    font-size: 1.2em;}img {    margin: 0.5em;}.buttons {    background-color: #073642 !important;    color: #93a1a1 !important;    font-family: sans-serif;    font-size: 1.5rem;}.hsReviewPanel {    display: none;}.title {    border: 0;}#postamble {    display: none;}#banner {    text-align: center;}#tabs {    background-color: #073642 !important;    float: left;    margin: 0px 0px 20px 0px;    padding: 0;    width: 100%;    font-family: sans-serif;}#tabs ul {    margin: 0;    padding: 0;}#tabs li {    float: left;    list-style-type: none;    margin: 0px 2px 0px 0px;    padding: 0px 0px 0px 0px;    white-space: nowrap;}#tabs li a {    display: block;    font-size: 120%;    font-weight: bold;    margin: 0;    padding: 4px 10px 4px 10px;    text-decoration: none;}#tabs li a:hover {    color: #90c5eb !important;}#tabs li.ui-tabs-active a {    background-color: #094352 !important;    color: #59a9e1 !important;}#content {    clear: both;    width: 80%;}#content > p {    margin: 1em;}#content > div > h2 {    margin: 0.25rem;}#postamble {    text-align: right;}blockquote {    background-color: #073642 !important;    padding-left: 0.75em;    padding-right: 0.75em;    padding-top: 0.01em;    padding-bottom: 0.01em;    overflow: hidden;    margin-left: 0;}.outline-text-2,.outline-text-3,.outline-text-4,.outline-text-5,.outline-text-6 {    padding-left: 4%;}.outline-3 {    padding-left: 4%;}.outline-4 {    padding-left: 4%;}.outline-5 {    padding-left: 4%;}.outline-6 {    padding-left: 4%;}h1,h2,h3,h4,h5,h6 {    font-family: sans-serif;    border-bottom: 2px solid;    border-color: #094352 !important;}a:hover {    text-decoration: underline;}#search {    display: block;    float: right;}.tag {    background-color: #002b36 !important;    color: #93a1a1 !important;    border: 0px;}.tag span {    background-color: #094352 !important;    margin: 0.25em;    padding: 0.25em;}#table-of-contents {    display: table;    float: right;}#table-of-contents h2 {    display: none;}#table-of-contents li {    list-style-type: none;}#table-of-contents a:hover {    text-decoration: underline;}#minitoc {    background-color: #073642 !important;    position: fixed;    top: 0px;    right: -5px;    padding: 0.5em;    z-index: 200;    width: 18%;    word-wrap: normal;    overflow: hidden;}#minitoc ul {    margin: 0.5em;    padding-left: 1em;}#minitoc h2 {    margin-top: 0;    margin-bottom: 0;    font-size: 110%;}#minitoc a {    display: block;    font-family: sans-serif;    text-decoration: none;}#minitoc a:hover {    text-decoration: underline;}/* #minitoc a { *//*   display: none; *//* } */#minitoc:hover a {    display: block;}#toTop {    top: -100px;    position: fixed;    text-align: center;    z-index: 999;    display: none;}#toTop:hover {    text-decoration: underline;}#left-panel-wrapper {    display: none;    position: fixed;    z-index: 200;}#left-panel-contents {    display: none;    position: fixed;    text-align: left;    top: 0;    z-index: 200;}#left-panel-button {    transform: rotate(90deg);    left: -23px;    position: fixed;    top: 50%;    z-index: 200;}#right-panel-wrapper {    position: fixed;    z-index: 200;}#right-panel-contents {    display: none;    z-index: 200;    position: fixed;    text-align: left;    top: 0;}.snippet-copy-to-clipboard {    display: none;    position: absolute;    left: 50px;    top: 50px;}.org-ol > li,.org-dl > dt {    margin-top: 0.5em;}.org-ul {    margin-top: 1em;    margin-bottom: 1em;}.org-ul li {    margin-top: 0.5em;}.org-ul > li > a {    font-family: sans-serif;}
+</style>
+<style type="text/css">
+/* hideshow.css --- HideShow CSS file *//* Copyright (C) 2014 All Right Reserved, Fabrice Niessen *//* This file is free software: you can redistribute it and/or *//* modify it under the terms of the GNU General Public License as *//* published by the Free Software Foundation, either version 3 of *//* the License, or (at your option) any later version. *//* This file is distributed in the hope that it will be useful, *//* but WITHOUT ANY WARRANTY; without even the implied warranty of *//* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *//* GNU General Public License for more details. *//* Author: Fabrice Niessen <(concat "fniessen" at-sign "pirilampo.org")> *//* URL: https://github.com/fniessen/hide-show/ *//* Version: 20140912.1722 */.hsExpanded.hsAnchor {background: #EE7700;}.buttons {    padding: 0px 7px 13px 0px;    background: #0A3F69;}.hsButton {    color: white;    float: right;    font-size: 70%;    margin-left: 10px;}    .hsButton:hover {        text-decoration: underline;        cursor: pointer;    }.ellipsis {    color: #999999;    /* background-color: #FFF8C0; */    /* float: right; */    margin-left: 0.6em;}.hsReview {    border: 1px solid #A4A4A4;    background-color: white;    z-index: 500; /* must be greater then z-index of hsOverlay */    position: relative; /* required for z-index to work */}#hsOverlay {    width: 100%;    height: 100%;    position: fixed;    left: 0px;    top: 0px;    background-color: #000;    opacity: .70;    z-index: 250; /* must be greater than any other z-index (except the one for .hsReview */}.hsReviewPanel {    background-color: #757176;    color: white;    line-height: 1.1em;    margin: 10px 0px;    padding: 10px;    position: fixed;    width: auto;    bottom: 0px;    right: 0px;    z-index: 501;    text-align: center;}    .hsReviewPanel.hsReviewing {        display: none;    }    .hsReviewPanel:hover {        cursor: pointer;    }.hsReviewingPanel {    background-color: white;    color: #757176;    line-height: 1.1em;    margin: 10px 0px;    padding: 10px;    position: fixed;    width: auto;    bottom: 0px;    right: 0px;    z-index: 501;    text-align: center;}.hsReviewButton:hover {    cursor: pointer;}.hsUnselectable {    -webkit-touch-callout: none;    -webkit-user-select: none;    -khtml-user-select: none;    -moz-user-select: none;    -ms-user-select: none;    user-select: none;}
+</style>
+<style type="text/css">
+.org-bold { /* bold */ font-weight: bold; }.org-bold-italic { /* bold-italic */ font-weight: bold; font-style: italic; }.org-buffer-menu-buffer { /* buffer-menu-buffer */ font-weight: bold; }.org-builtin { /* font-lock-builtin-face */ color: #7a378b; }.org-button { /* button */ text-decoration: underline; }.org-calendar-today { /* calendar-today */ text-decoration: underline; }.org-change-log-acknowledgement { /* change-log-acknowledgement */ color: #b22222; }.org-change-log-conditionals { /* change-log-conditionals */ color: #a0522d; }.org-change-log-date { /* change-log-date */ color: #8b2252; }.org-change-log-email { /* change-log-email */ color: #a0522d; }.org-change-log-file { /* change-log-file */ color: #0000ff; }.org-change-log-function { /* change-log-function */ color: #a0522d; }.org-change-log-list { /* change-log-list */ color: #a020f0; }.org-change-log-name { /* change-log-name */ color: #008b8b; }.org-comint-highlight-input { /* comint-highlight-input */ font-weight: bold; }.org-comint-highlight-prompt { /* comint-highlight-prompt */ color: #00008b; }.org-comment { /* font-lock-comment-face */ color: #b22222; }.org-comment-delimiter { /* font-lock-comment-delimiter-face */ color: #b22222; }.org-completions-annotations { /* completions-annotations */ font-style: italic; }.org-completions-common-part { /* completions-common-part */ color: #000000; background-color: #ffffff; }.org-completions-first-difference { /* completions-first-difference */ font-weight: bold; }.org-constant { /* font-lock-constant-face */ color: #008b8b; }.org-diary { /* diary */ color: #ff0000; }.org-diff-context { /* diff-context */ color: #7f7f7f; }.org-diff-file-header { /* diff-file-header */ background-color: #b3b3b3; font-weight: bold; }.org-diff-function { /* diff-function */ background-color: #cccccc; }.org-diff-header { /* diff-header */ background-color: #cccccc; }.org-diff-hunk-header { /* diff-hunk-header */ background-color: #cccccc; }.org-diff-index { /* diff-index */ background-color: #b3b3b3; font-weight: bold; }.org-diff-nonexistent { /* diff-nonexistent */ background-color: #b3b3b3; font-weight: bold; }.org-diff-refine-change { /* diff-refine-change */ background-color: #d9d9d9; }.org-dired-directory { /* dired-directory */ color: #0000ff; }.org-dired-flagged { /* dired-flagged */ color: #ff0000; font-weight: bold; }.org-dired-header { /* dired-header */ color: #228b22; }.org-dired-ignored { /* dired-ignored */ color: #7f7f7f; }.org-dired-mark { /* dired-mark */ color: #008b8b; }.org-dired-marked { /* dired-marked */ color: #ff0000; font-weight: bold; }.org-dired-perm-write { /* dired-perm-write */ color: #b22222; }.org-dired-symlink { /* dired-symlink */ color: #a020f0; }.org-dired-warning { /* dired-warning */ color: #ff0000; font-weight: bold; }.org-doc { /* font-lock-doc-face */ color: #8b2252; }.org-escape-glyph { /* escape-glyph */ color: #a52a2a; }.org-file-name-shadow { /* file-name-shadow */ color: #7f7f7f; }.org-flyspell-duplicate { /* flyspell-duplicate */ color: #cdad00; font-weight: bold; text-decoration: underline; }.org-flyspell-incorrect { /* flyspell-incorrect */ color: #ff4500; font-weight: bold; text-decoration: underline; }.org-fringe { /* fringe */ background-color: #f2f2f2; }.org-function-name { /* font-lock-function-name-face */ color: #0000ff; }.org-header-line { /* header-line */ color: #333333; background-color: #e5e5e5; }.org-help-argument-name { /* help-argument-name */ font-style: italic; }.org-highlight { /* highlight */ background-color: #b4eeb4; }.org-holiday { /* holiday */ background-color: #ffc0cb; }.org-isearch { /* isearch */ color: #b0e2ff; background-color: #cd00cd; }.org-isearch-fail { /* isearch-fail */ background-color: #ffc1c1; }.org-italic { /* italic */ font-style: italic; }.org-keyword { /* font-lock-keyword-face */ color: #a020f0; }.org-lazy-highlight { /* lazy-highlight */ background-color: #afeeee; }.org-link { /* link */ color: #0000ff; text-decoration: underline; }.org-link-visited { /* link-visited */ color: #8b008b; text-decoration: underline; }.org-log-edit-header { /* log-edit-header */ color: #a020f0; }.org-log-edit-summary { /* log-edit-summary */ color: #0000ff; }.org-log-edit-unknown-header { /* log-edit-unknown-header */ color: #b22222; }.org-match { /* match */ background-color: #ffff00; }.org-next-error { /* next-error */ background-color: #eedc82; }.org-nobreak-space { /* nobreak-space */ color: #a52a2a; text-decoration: underline; }.org-org-archived { /* org-archived */ color: #7f7f7f; }.org-org-block { /* org-block */ color: #7f7f7f; }.org-org-block-begin-line { /* org-block-begin-line */ color: #b22222; }.org-org-block-end-line { /* org-block-end-line */ color: #b22222; }.org-org-checkbox { /* org-checkbox */ font-weight: bold; }.org-org-checkbox-statistics-done { /* org-checkbox-statistics-done */ color: #228b22; font-weight: bold; }.org-org-checkbox-statistics-todo { /* org-checkbox-statistics-todo */ color: #ff0000; font-weight: bold; }.org-org-clock-overlay { /* org-clock-overlay */ background-color: #ffff00; }.org-org-code { /* org-code */ color: #7f7f7f; }.org-org-column { /* org-column */ background-color: #e5e5e5; }.org-org-column-title { /* org-column-title */ background-color: #e5e5e5; font-weight: bold; text-decoration: underline; }.org-org-date { /* org-date */ color: #a020f0; text-decoration: underline; }.org-org-document-info { /* org-document-info */ color: #191970; }.org-org-document-info-keyword { /* org-document-info-keyword */ color: #7f7f7f; }.org-org-document-title { /* org-document-title */ color: #191970; font-size: 144%; font-weight: bold; }.org-org-done { /* org-done */ color: #228b22; font-weight: bold; }.org-org-drawer { /* org-drawer */ color: #0000ff; }.org-org-ellipsis { /* org-ellipsis */ color: #b8860b; text-decoration: underline; }.org-org-footnote { /* org-footnote */ color: #a020f0; text-decoration: underline; }.org-org-formula { /* org-formula */ color: #b22222; }.org-org-headline-done { /* org-headline-done */ color: #bc8f8f; }.org-org-hide { /* org-hide */ color: #ffffff; }.org-org-latex-and-export-specials { /* org-latex-and-export-specials */ color: #8b4513; }.org-org-level-1 { /* org-level-1 */ color: #0000ff; }.org-org-level-2 { /* org-level-2 */ color: #a0522d; }.org-org-level-3 { /* org-level-3 */ color: #a020f0; }.org-org-level-4 { /* org-level-4 */ color: #b22222; }.org-org-level-5 { /* org-level-5 */ color: #228b22; }.org-org-level-6 { /* org-level-6 */ color: #008b8b; }.org-org-level-7 { /* org-level-7 */ color: #7a378b; }.org-org-level-8 { /* org-level-8 */ color: #8b2252; }.org-org-link { /* org-link */ color: #0000ff; text-decoration: underline; }.org-org-meta-line { /* org-meta-line */ color: #b22222; }.org-org-mode-line-clock { /* org-mode-line-clock */ color: #000000; background-color: #bfbfbf; }.org-org-mode-line-clock-overrun { /* org-mode-line-clock-overrun */ color: #000000; background-color: #ff0000; }.org-org-quote { /* org-quote */ color: #7f7f7f; }.org-org-scheduled { /* org-scheduled */ color: #006400; }.org-org-scheduled-previously { /* org-scheduled-previously */ color: #b22222; }.org-org-scheduled-today { /* org-scheduled-today */ color: #006400; }.org-org-sexp-date { /* org-sexp-date */ color: #a020f0; }.org-org-special-keyword { /* org-special-keyword */ color: #a020f0; }.org-org-table { /* org-table */ color: #0000ff; }.org-org-tag { /* org-tag */ font-weight: bold; }.org-org-target { /* org-target */ text-decoration: underline; }.org-org-time-grid { /* org-time-grid */ color: #b8860b; }.org-org-todo { /* org-todo */ color: #ff0000; font-weight: bold; }.org-org-upcoming-deadline { /* org-upcoming-deadline */ color: #b22222; }.org-org-verbatim { /* org-verbatim */ color: #7f7f7f; }.org-org-verse { /* org-verse */ color: #7f7f7f; }.org-org-warning { /* org-warning */ color: #ff0000; font-weight: bold; }.org-outline-1 { /* outline-1 */ color: #0000ff; }.org-outline-2 { /* outline-2 */ color: #a0522d; }.org-outline-3 { /* outline-3 */ color: #a020f0; }.org-outline-4 { /* outline-4 */ color: #b22222; }.org-outline-5 { /* outline-5 */ color: #228b22; }.org-outline-6 { /* outline-6 */ color: #008b8b; }.org-outline-7 { /* outline-7 */ color: #7a378b; }.org-outline-8 { /* outline-8 */ color: #8b2252; }.org-preprocessor { /* font-lock-preprocessor-face */ color: #7a378b; }.org-query-replace { /* query-replace */ color: #b0e2ff; background-color: #cd00cd; }.org-regexp-grouping-backslash { /* font-lock-regexp-grouping-backslash */ font-weight: bold; }.org-regexp-grouping-construct { /* font-lock-regexp-grouping-construct */ font-weight: bold; }.org-region { /* region */ background-color: #eedc82; }.org-secondary-selection { /* secondary-selection */ background-color: #ffff00; }.org-shadow { /* shadow */ color: #7f7f7f; }.org-show-paren-match { /* show-paren-match */ background-color: #40e0d0; }.org-show-paren-mismatch { /* show-paren-mismatch */ color: #ffffff; background-color: #a020f0; }.org-string { /* font-lock-string-face */ color: #8b2252; }.org-tool-bar { /* tool-bar */ color: #000000; background-color: #bfbfbf; }.org-tooltip { /* tooltip */ color: #000000; background-color: #ffffe0; }.org-trailing-whitespace { /* trailing-whitespace */ background-color: #ff0000; }.org-type { /* font-lock-type-face */ color: #228b22; }.org-underline { /* underline */ text-decoration: underline; }.org-variable-name { /* font-lock-variable-name-face */ color: #a0522d; }.org-warning { /* font-lock-warning-face */ color: #ff0000; font-weight: bold; }.org-widget-button { /* widget-button */ font-weight: bold; }.org-widget-button-pressed { /* widget-button-pressed */ color: #ff0000; }.org-widget-documentation { /* widget-documentation */ color: #006400; }.org-widget-field { /* widget-field */ background-color: #d9d9d9; }.org-widget-inactive { /* widget-inactive */ color: #7f7f7f; }.org-widget-single-line-field { /* widget-single-line-field */ background-color: #d9d9d9; }
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t.ui.ie&&(!document.documentMode||9>document.documentMode)&&!e.button?this._mouseUp(e):this._mouseStarted?(this._mouseDrag(e),e.preventDefault()):(this._mouseDistanceMet(e)&&this._mouseDelayMet(e)&&(this._mouseStarted=this._mouseStart(this._mouseDownEvent,e)!==!1,this._mouseStarted?this._mouseDrag(e):this._mouseUp(e)),!this._mouseStarted)},_mouseUp:function(e){return t(document).unbind("mousemove."+this.widgetName,this._mouseMoveDelegate).unbind("mouseup."+this.widgetName,this._mouseUpDelegate),this._mouseStarted&&(this._mouseStarted=!1,e.target===this._mouseDownEvent.target&&t.data(e.target,this.widgetName+".preventClickEvent",!0),this._mouseStop(e)),!1},_mouseDistanceMet:function(t){return Math.max(Math.abs(this._mouseDownEvent.pageX-t.pageX),Math.abs(this._mouseDownEvent.pageY-t.pageY))>=this.options.distance},_mouseDelayMet:function(){return this.mouseDelayMet},_mouseStart:function(){},_mouseDrag:function(){},_mouseStop:function(){},_mouseCapture:function(){return!0}})}(jQuery),function(t){t.widget("ui.draggable",t.ui.mouse,{version:"1.10.2",widgetEventPrefix:"drag",options:{addClasses:!0,appendTo:"parent",axis:!1,connectToSortable:!1,containment:!1,cursor:"auto",cursorAt:!1,grid:!1,handle:!1,helper:"original",iframeFix:!1,opacity:!1,refreshPositions:!1,revert:!1,revertDuration:500,scope:"default",scroll:!0,scrollSensitivity:20,scrollSpeed:20,snap:!1,snapMode:"both",snapTolerance:20,stack:!1,zIndex:!1,drag:null,start:null,stop:null},_create:function(){"original"!==this.options.helper||/^(?:r|a|f)/.test(this.element.css("position"))||(this.element[0].style.position="relative"),this.options.addClasses&&this.element.addClass("ui-draggable"),this.options.disabled&&this.element.addClass("ui-draggable-disabled"),this._mouseInit()},_destroy:function(){this.element.removeClass("ui-draggable ui-draggable-dragging 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n||"original"!==this.options.helper?("invalid"===this.options.revert&&!o||"valid"===this.options.revert&&o||this.options.revert===!0||t.isFunction(this.options.revert)&&this.options.revert.call(this.element,o)?t(this.helper).animate(this.originalPosition,parseInt(this.options.revertDuration,10),function(){s._trigger("stop",e)!==!1&&s._clear()}):this._trigger("stop",e)!==!1&&this._clear(),!1):!1},_mouseUp:function(e){return t("div.ui-draggable-iframeFix").each(function(){this.parentNode.removeChild(this)}),t.ui.ddmanager&&t.ui.ddmanager.dragStop(this,e),t.ui.mouse.prototype._mouseUp.call(this,e)},cancel:function(){return this.helper.is(".ui-draggable-dragging")?this._mouseUp({}):this._clear(),this},_getHandle:function(e){return this.options.handle?!!t(e.target).closest(this.element.find(this.options.handle)).length:!0},_createHelper:function(e){var i=this.options,s=t.isFunction(i.helper)?t(i.helper.apply(this.element[0],[e])):"clone"===i.helper?this.element.clone().removeAttr("id"):this.element;return s.parents("body").length||s.appendTo("parent"===i.appendTo?this.element[0].parentNode:i.appendTo),s[0]===this.element[0]||/(fixed|absolute)/.test(s.css("position"))||s.css("position","absolute"),s},_adjustOffsetFromHelper:function(e){"string"==typeof e&&(e=e.split(" ")),t.isArray(e)&&(e={left:+e[0],top:+e[1]||0}),"left"in e&&(this.offset.click.left=e.left+this.margins.left),"right"in e&&(this.offset.click.left=this.helperProportions.width-e.right+this.margins.left),"top"in e&&(this.offset.click.top=e.top+this.margins.top),"bottom"in e&&(this.offset.click.top=this.helperProportions.height-e.bottom+this.margins.top)},_getParentOffset:function(){this.offsetParent=this.helper.offsetParent();var e=this.offsetParent.offset();return"absolute"===this.cssPosition&&this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])&&(e.left+=this.scrollParent.scrollLeft(),e.top+=this.scrollParent.scrollTop()),(this.offsetParent[0]===document.body||this.offsetParent[0].tagName&&"html"===this.offsetParent[0].tagName.toLowerCase()&&t.ui.ie)&&(e={top:0,left:0}),{top:e.top+(parseInt(this.offsetParent.css("borderTopWidth"),10)||0),left:e.left+(parseInt(this.offsetParent.css("borderLeftWidth"),10)||0)}},_getRelativeOffset:function(){if("relative"===this.cssPosition){var t=this.element.position();return{top:t.top-(parseInt(this.helper.css("top"),10)||0)+this.scrollParent.scrollTop(),left:t.left-(parseInt(this.helper.css("left"),10)||0)+this.scrollParent.scrollLeft()}}return{top:0,left:0}},_cacheMargins:function(){this.margins={left:parseInt(this.element.css("marginLeft"),10)||0,top:parseInt(this.element.css("marginTop"),10)||0,right:parseInt(this.element.css("marginRight"),10)||0,bottom:parseInt(this.element.css("marginBottom"),10)||0}},_cacheHelperProportions:function(){this.helperProportions={width:this.helper.outerWidth(),height:this.helper.outerHeight()}},_setContainment:function(){var e,i,s,n=this.options;if("parent"===n.containment&&(n.containment=this.helper[0].parentNode),("document"===n.containment||"window"===n.containment)&&(this.containment=["document"===n.containment?0:t(window).scrollLeft()-this.offset.relative.left-this.offset.parent.left,"document"===n.containment?0:t(window).scrollTop()-this.offset.relative.top-this.offset.parent.top,("document"===n.containment?0:t(window).scrollLeft())+t("document"===n.containment?document:window).width()-this.helperProportions.width-this.margins.left,("document"===n.containment?0:t(window).scrollTop())+(t("document"===n.containment?document:window).height()||document.body.parentNode.scrollHeight)-this.helperProportions.height-this.margins.top]),/^(document|window|parent)$/.test(n.containment)||n.containment.constructor===Array)n.containment.constructor===Array&&(this.containment=n.containment);else{if(i=t(n.containment),s=i[0],!s)return;e="hidden"!==t(s).css("overflow"),this.containment=[(parseInt(t(s).css("borderLeftWidth"),10)||0)+(parseInt(t(s).css("paddingLeft"),10)||0),(parseInt(t(s).css("borderTopWidth"),10)||0)+(parseInt(t(s).css("paddingTop"),10)||0),(e?Math.max(s.scrollWidth,s.offsetWidth):s.offsetWidth)-(parseInt(t(s).css("borderRightWidth"),10)||0)-(parseInt(t(s).css("paddingRight"),10)||0)-this.helperProportions.width-this.margins.left-this.margins.right,(e?Math.max(s.scrollHeight,s.offsetHeight):s.offsetHeight)-(parseInt(t(s).css("borderBottomWidth"),10)||0)-(parseInt(t(s).css("paddingBottom"),10)||0)-this.helperProportions.height-this.margins.top-this.margins.bottom],this.relative_container=i}},_convertPositionTo:function(e,i){i||(i=this.position);var s="absolute"===e?1:-1,n="absolute"!==this.cssPosition||this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])?this.scrollParent:this.offsetParent,o=/(html|body)/i.test(n[0].tagName);return{top:i.top+this.offset.relative.top*s+this.offset.parent.top*s-("fixed"===this.cssPosition?-this.scrollParent.scrollTop():o?0:n.scrollTop())*s,left:i.left+this.offset.relative.left*s+this.offset.parent.left*s-("fixed"===this.cssPosition?-this.scrollParent.scrollLeft():o?0:n.scrollLeft())*s}},_generatePosition:function(e){var i,s,n,o,a=this.options,r="absolute"!==this.cssPosition||this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])?this.scrollParent:this.offsetParent,h=/(html|body)/i.test(r[0].tagName),l=e.pageX,c=e.pageY;return this.originalPosition&&(this.containment&&(this.relative_container?(s=this.relative_container.offset(),i=[this.containment[0]+s.left,this.containment[1]+s.top,this.containment[2]+s.left,this.containment[3]+s.top]):i=this.containment,e.pageX-this.offset.click.left<i[0]&&(l=i[0]+this.offset.click.left),e.pageY-this.offset.click.top<i[1]&&(c=i[1]+this.offset.click.top),e.pageX-this.offset.click.left>i[2]&&(l=i[2]+this.offset.click.left),e.pageY-this.offset.click.top>i[3]&&(c=i[3]+this.offset.click.top)),a.grid&&(n=a.grid[1]?this.originalPageY+Math.round((c-this.originalPageY)/a.grid[1])*a.grid[1]:this.originalPageY,c=i?n-this.offset.click.top>=i[1]||n-this.offset.click.top>i[3]?n:n-this.offset.click.top>=i[1]?n-a.grid[1]:n+a.grid[1]:n,o=a.grid[0]?this.originalPageX+Math.round((l-this.originalPageX)/a.grid[0])*a.grid[0]:this.originalPageX,l=i?o-this.offset.click.left>=i[0]||o-this.offset.click.left>i[2]?o:o-this.offset.click.left>=i[0]?o-a.grid[0]:o+a.grid[0]:o)),{top:c-this.offset.click.top-this.offset.relative.top-this.offset.parent.top+("fixed"===this.cssPosition?-this.scrollParent.scrollTop():h?0:r.scrollTop()),left:l-this.offset.click.left-this.offset.relative.left-this.offset.parent.left+("fixed"===this.cssPosition?-this.scrollParent.scrollLeft():h?0:r.scrollLeft())}},_clear:function(){this.helper.removeClass("ui-draggable-dragging"),this.helper[0]===this.element[0]||this.cancelHelperRemoval||this.helper.remove(),this.helper=null,this.cancelHelperRemoval=!1},_trigger:function(e,i,s){return s=s||this._uiHash(),t.ui.plugin.call(this,e,[i,s]),"drag"===e&&(this.positionAbs=this._convertPositionTo("absolute")),t.Widget.prototype._trigger.call(this,e,i,s)},plugins:{},_uiHash:function(){return{helper:this.helper,position:this.position,originalPosition:this.originalPosition,offset:this.positionAbs}}}),t.ui.plugin.add("draggable","connectToSortable",{start:function(e,i){var s=t(this).data("ui-draggable"),n=s.options,o=t.extend({},i,{item:s.element});s.sortables=[],t(n.connectToSortable).each(function(){var i=t.data(this,"ui-sortable");i&&!i.options.disabled&&(s.sortables.push({instance:i,shouldRevert:i.options.revert}),i.refreshPositions(),i._trigger("activate",e,o))})},stop:function(e,i){var s=t(this).data("ui-draggable"),n=t.extend({},i,{item:s.element});t.each(s.sortables,function(){this.instance.isOver?(this.instance.isOver=0,s.cancelHelperRemoval=!0,this.instance.cancelHelperRemoval=!1,this.shouldRevert&&(this.instance.options.revert=this.shouldRevert),this.instance._mouseStop(e),this.instance.options.helper=this.instance.options._helper,"original"===s.options.helper&&this.instance.currentItem.css({top:"auto",left:"auto"})):(this.instance.cancelHelperRemoval=!1,this.instance._trigger("deactivate",e,n))})},drag:function(e,i){var s=t(this).data("ui-draggable"),n=this;t.each(s.sortables,function(){var o=!1,a=this;this.instance.positionAbs=s.positionAbs,this.instance.helperProportions=s.helperProportions,this.instance.offset.click=s.offset.click,this.instance._intersectsWith(this.instance.containerCache)&&(o=!0,t.each(s.sortables,function(){return 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i.helper[0]},e.target=this.instance.currentItem[0],this.instance._mouseCapture(e,!0),this.instance._mouseStart(e,!0,!0),this.instance.offset.click.top=s.offset.click.top,this.instance.offset.click.left=s.offset.click.left,this.instance.offset.parent.left-=s.offset.parent.left-this.instance.offset.parent.left,this.instance.offset.parent.top-=s.offset.parent.top-this.instance.offset.parent.top,s._trigger("toSortable",e),s.dropped=this.instance.element,s.currentItem=s.element,this.instance.fromOutside=s),this.instance.currentItem&&this.instance._mouseDrag(e)):this.instance.isOver&&(this.instance.isOver=0,this.instance.cancelHelperRemoval=!0,this.instance.options.revert=!1,this.instance._trigger("out",e,this.instance._uiHash(this.instance)),this.instance._mouseStop(e,!0),this.instance.options.helper=this.instance.options._helper,this.instance.currentItem.remove(),this.instance.placeholder&&this.instance.placeholder.remove(),s._trigger("fromSortable",e),s.dropped=!1)})}}),t.ui.plugin.add("draggable","cursor",{start:function(){var e=t("body"),i=t(this).data("ui-draggable").options;e.css("cursor")&&(i._cursor=e.css("cursor")),e.css("cursor",i.cursor)},stop:function(){var e=t(this).data("ui-draggable").options;e._cursor&&t("body").css("cursor",e._cursor)}}),t.ui.plugin.add("draggable","opacity",{start:function(e,i){var s=t(i.helper),n=t(this).data("ui-draggable").options;s.css("opacity")&&(n._opacity=s.css("opacity")),s.css("opacity",n.opacity)},stop:function(e,i){var s=t(this).data("ui-draggable").options;s._opacity&&t(i.helper).css("opacity",s._opacity)}}),t.ui.plugin.add("draggable","scroll",{start:function(){var e=t(this).data("ui-draggable");e.scrollParent[0]!==document&&"HTML"!==e.scrollParent[0].tagName&&(e.overflowOffset=e.scrollParent.offset())},drag:function(e){var i=t(this).data("ui-draggable"),s=i.options,n=!1;i.scrollParent[0]!==document&&"HTML"!==i.scrollParent[0].tagName?(s.axis&&"x"===s.axis||(i.overflowOffset.top+i.scrollParent[0].offsetHeight-e.pageY<s.scrollSensitivity?i.scrollParent[0].scrollTop=n=i.scrollParent[0].scrollTop+s.scrollSpeed:e.pageY-i.overflowOffset.top<s.scrollSensitivity&&(i.scrollParent[0].scrollTop=n=i.scrollParent[0].scrollTop-s.scrollSpeed)),s.axis&&"y"===s.axis||(i.overflowOffset.left+i.scrollParent[0].offsetWidth-e.pageX<s.scrollSensitivity?i.scrollParent[0].scrollLeft=n=i.scrollParent[0].scrollLeft+s.scrollSpeed:e.pageX-i.overflowOffset.left<s.scrollSensitivity&&(i.scrollParent[0].scrollLeft=n=i.scrollParent[0].scrollLeft-s.scrollSpeed))):(s.axis&&"x"===s.axis||(e.pageY-t(document).scrollTop()<s.scrollSensitivity?n=t(document).scrollTop(t(document).scrollTop()-s.scrollSpeed):t(window).height()-(e.pageY-t(document).scrollTop())<s.scrollSensitivity&&(n=t(document).scrollTop(t(document).scrollTop()+s.scrollSpeed))),s.axis&&"y"===s.axis||(e.pageX-t(document).scrollLeft()<s.scrollSensitivity?n=t(document).scrollLeft(t(document).scrollLeft()-s.scrollSpeed):t(window).width()-(e.pageX-t(document).scrollLeft())<s.scrollSensitivity&&(n=t(document).scrollLeft(t(document).scrollLeft()+s.scrollSpeed)))),n!==!1&&t.ui.ddmanager&&!s.dropBehaviour&&t.ui.ddmanager.prepareOffsets(i,e)}}),t.ui.plugin.add("draggable","snap",{start:function(){var e=t(this).data("ui-draggable"),i=e.options;e.snapElements=[],t(i.snap.constructor!==String?i.snap.items||":data(ui-draggable)":i.snap).each(function(){var i=t(this),s=i.offset();this!==e.element[0]&&e.snapElements.push({item:this,width:i.outerWidth(),height:i.outerHeight(),top:s.top,left:s.left})})},drag:function(e,i){var s,n,o,a,r,h,l,c,u,d,p=t(this).data("ui-draggable"),f=p.options,g=f.snapTolerance,m=i.offset.left,v=m+p.helperProportions.width,_=i.offset.top,b=_+p.helperProportions.height;for(u=p.snapElements.length-1;u>=0;u--)r=p.snapElements[u].left,h=r+p.snapElements[u].width,l=p.snapElements[u].top,c=l+p.snapElements[u].height,m>r-g&&h+g>m&&_>l-g&&c+g>_||m>r-g&&h+g>m&&b>l-g&&c+g>b||v>r-g&&h+g>v&&_>l-g&&c+g>_||v>r-g&&h+g>v&&b>l-g&&c+g>b?("inner"!==f.snapMode&&(s=g>=Math.abs(l-b),n=g>=Math.abs(c-_),o=g>=Math.abs(r-v),a=g>=Math.abs(h-m),s&&(i.position.top=p._convertPositionTo("relative",{top:l-p.helperProportions.height,left:0}).top-p.margins.top),n&&(i.position.top=p._convertPositionTo("relative",{top:c,left:0}).top-p.margins.top),o&&(i.position.left=p._convertPositionTo("relative",{top:0,left:r-p.helperProportions.width}).left-p.margins.left),a&&(i.position.left=p._convertPositionTo("relative",{top:0,left:h}).left-p.margins.left)),d=s||n||o||a,"outer"!==f.snapMode&&(s=g>=Math.abs(l-_),n=g>=Math.abs(c-b),o=g>=Math.abs(r-m),a=g>=Math.abs(h-v),s&&(i.position.top=p._convertPositionTo("relative",{top:l,left:0}).top-p.margins.top),n&&(i.position.top=p._convertPositionTo("relative",{top:c-p.helperProportions.height,left:0}).top-p.margins.top),o&&(i.position.left=p._convertPositionTo("relative",{top:0,left:r}).left-p.margins.left),a&&(i.position.left=p._convertPositionTo("relative",{top:0,left:h-p.helperProportions.width}).left-p.margins.left)),!p.snapElements[u].snapping&&(s||n||o||a||d)&&p.options.snap.snap&&p.options.snap.snap.call(p.element,e,t.extend(p._uiHash(),{snapItem:p.snapElements[u].item})),p.snapElements[u].snapping=s||n||o||a||d):(p.snapElements[u].snapping&&p.options.snap.release&&p.options.snap.release.call(p.element,e,t.extend(p._uiHash(),{snapItem:p.snapElements[u].item})),p.snapElements[u].snapping=!1)}}),t.ui.plugin.add("draggable","stack",{start:function(){var e,i=this.data("ui-draggable").options,s=t.makeArray(t(i.stack)).sort(function(e,i){return(parseInt(t(e).css("zIndex"),10)||0)-(parseInt(t(i).css("zIndex"),10)||0)});s.length&&(e=parseInt(t(s[0]).css("zIndex"),10)||0,t(s).each(function(i){t(this).css("zIndex",e+i)}),this.css("zIndex",e+s.length))}}),t.ui.plugin.add("draggable","zIndex",{start:function(e,i){var s=t(i.helper),n=t(this).data("ui-draggable").options;s.css("zIndex")&&(n._zIndex=s.css("zIndex")),s.css("zIndex",n.zIndex)},stop:function(e,i){var s=t(this).data("ui-draggable").options;s._zIndex&&t(i.helper).css("zIndex",s._zIndex)}})}(jQuery),function(t){function e(t,e,i){return t>e&&e+i>t}t.widget("ui.droppable",{version:"1.10.2",widgetEventPrefix:"drop",options:{accept:"*",activeClass:!1,addClasses:!0,greedy:!1,hoverClass:!1,scope:"default",tolerance:"intersect",activate:null,deactivate:null,drop:null,out:null,over:null},_create:function(){var e=this.options,i=e.accept;this.isover=!1,this.isout=!0,this.accept=t.isFunction(i)?i:function(t){return t.is(i)},this.proportions={width:this.element[0].offsetWidth,height:this.element[0].offsetHeight},t.ui.ddmanager.droppables[e.scope]=t.ui.ddmanager.droppables[e.scope]||[],t.ui.ddmanager.droppables[e.scope].push(this),e.addClasses&&this.element.addClass("ui-droppable")},_destroy:function(){for(var e=0,i=t.ui.ddmanager.droppables[this.options.scope];i.length>e;e++)i[e]===this&&i.splice(e,1);this.element.removeClass("ui-droppable ui-droppable-disabled")},_setOption:function(e,i){"accept"===e&&(this.accept=t.isFunction(i)?i:function(t){return t.is(i)}),t.Widget.prototype._setOption.apply(this,arguments)},_activate:function(e){var i=t.ui.ddmanager.current;this.options.activeClass&&this.element.addClass(this.options.activeClass),i&&this._trigger("activate",e,this.ui(i))},_deactivate:function(e){var i=t.ui.ddmanager.current;this.options.activeClass&&this.element.removeClass(this.options.activeClass),i&&this._trigger("deactivate",e,this.ui(i))},_over:function(e){var i=t.ui.ddmanager.current;i&&(i.currentItem||i.element)[0]!==this.element[0]&&this.accept.call(this.element[0],i.currentItem||i.element)&&(this.options.hoverClass&&this.element.addClass(this.options.hoverClass),this._trigger("over",e,this.ui(i)))},_out:function(e){var i=t.ui.ddmanager.current;i&&(i.currentItem||i.element)[0]!==this.element[0]&&this.accept.call(this.element[0],i.currentItem||i.element)&&(this.options.hoverClass&&this.element.removeClass(this.options.hoverClass),this._trigger("out",e,this.ui(i)))},_drop:function(e,i){var s=i||t.ui.ddmanager.current,n=!1;return s&&(s.currentItem||s.element)[0]!==this.element[0]?(this.element.find(":data(ui-droppable)").not(".ui-draggable-dragging").each(function(){var e=t.data(this,"ui-droppable");return e.options.greedy&&!e.options.disabled&&e.options.scope===s.options.scope&&e.accept.call(e.element[0],s.currentItem||s.element)&&t.ui.intersect(s,t.extend(e,{offset:e.element.offset()}),e.options.tolerance)?(n=!0,!1):undefined}),n?!1:this.accept.call(this.element[0],s.currentItem||s.element)?(this.options.activeClass&&this.element.removeClass(this.options.activeClass),this.options.hoverClass&&this.element.removeClass(this.options.hoverClass),this._trigger("drop",e,this.ui(s)),this.element):!1):!1},ui:function(t){return{draggable:t.currentItem||t.element,helper:t.helper,position:t.position,offset:t.positionAbs}}}),t.ui.intersect=function(t,i,s){if(!i.offset)return!1;var n,o,a=(t.positionAbs||t.position.absolute).left,r=a+t.helperProportions.width,h=(t.positionAbs||t.position.absolute).top,l=h+t.helperProportions.height,c=i.offset.left,u=c+i.proportions.width,d=i.offset.top,p=d+i.proportions.height;switch(s){case"fit":return a>=c&&u>=r&&h>=d&&p>=l;case"intersect":return a+t.helperProportions.width/2>c&&u>r-t.helperProportions.width/2&&h+t.helperProportions.height/2>d&&p>l-t.helperProportions.height/2;case"pointer":return n=(t.positionAbs||t.position.absolute).left+(t.clickOffset||t.offset.click).left,o=(t.positionAbs||t.position.absolute).top+(t.clickOffset||t.offset.click).top,e(o,d,i.proportions.height)&&e(n,c,i.proportions.width);case"touch":return(h>=d&&p>=h||l>=d&&p>=l||d>h&&l>p)&&(a>=c&&u>=a||r>=c&&u>=r||c>a&&r>u);default:return!1}},t.ui.ddmanager={current:null,droppables:{"default":[]},prepareOffsets:function(e,i){var s,n,o=t.ui.ddmanager.droppables[e.options.scope]||[],a=i?i.type:null,r=(e.currentItem||e.element).find(":data(ui-droppable)").addBack();t:for(s=0;o.length>s;s++)if(!(o[s].options.disabled||e&&!o[s].accept.call(o[s].element[0],e.currentItem||e.element))){for(n=0;r.length>n;n++)if(r[n]===o[s].element[0]){o[s].proportions.height=0;continue t}o[s].visible="none"!==o[s].element.css("display"),o[s].visible&&("mousedown"===a&&o[s]._activate.call(o[s],i),o[s].offset=o[s].element.offset(),o[s].proportions={width:o[s].element[0].offsetWidth,height:o[s].element[0].offsetHeight})}},drop:function(e,i){var s=!1;return t.each((t.ui.ddmanager.droppables[e.options.scope]||[]).slice(),function(){this.options&&(!this.options.disabled&&this.visible&&t.ui.intersect(e,this,this.options.tolerance)&&(s=this._drop.call(this,i)||s),!this.options.disabled&&this.visible&&this.accept.call(this.element[0],e.currentItem||e.element)&&(this.isout=!0,this.isover=!1,this._deactivate.call(this,i)))}),s},dragStart:function(e,i){e.element.parentsUntil("body").bind("scroll.droppable",function(){e.options.refreshPositions||t.ui.ddmanager.prepareOffsets(e,i)})},drag:function(e,i){e.options.refreshPositions&&t.ui.ddmanager.prepareOffsets(e,i),t.each(t.ui.ddmanager.droppables[e.options.scope]||[],function(){if(!this.options.disabled&&!this.greedyChild&&this.visible){var s,n,o,a=t.ui.intersect(e,this,this.options.tolerance),r=!a&&this.isover?"isout":a&&!this.isover?"isover":null;r&&(this.options.greedy&&(n=this.options.scope,o=this.element.parents(":data(ui-droppable)").filter(function(){return t.data(this,"ui-droppable").options.scope===n}),o.length&&(s=t.data(o[0],"ui-droppable"),s.greedyChild="isover"===r)),s&&"isover"===r&&(s.isover=!1,s.isout=!0,s._out.call(s,i)),this[r]=!0,this["isout"===r?"isover":"isout"]=!1,this["isover"===r?"_over":"_out"].call(this,i),s&&"isout"===r&&(s.isout=!1,s.isover=!0,s._over.call(s,i)))}})},dragStop:function(e,i){e.element.parentsUntil("body").unbind("scroll.droppable"),e.options.refreshPositions||t.ui.ddmanager.prepareOffsets(e,i)}}}(jQuery),function(t){function e(t){return parseInt(t,10)||0}function i(t){return!isNaN(parseInt(t,10))}t.widget("ui.resizable",t.ui.mouse,{version:"1.10.2",widgetEventPrefix:"resize",options:{alsoResize:!1,animate:!1,animateDuration:"slow",animateEasing:"swing",aspectRatio:!1,autoHide:!1,containment:!1,ghost:!1,grid:!1,handles:"e,s,se",helper:!1,maxHeight:null,maxWidth:null,minHeight:10,minWidth:10,zIndex:90,resize:null,start:null,stop:null},_create:function(){var e,i,s,n,o,a=this,r=this.options;if(this.element.addClass("ui-resizable"),t.extend(this,{_aspectRatio:!!r.aspectRatio,aspectRatio:r.aspectRatio,originalElement:this.element,_proportionallyResizeElements:[],_helper:r.helper||r.ghost||r.animate?r.helper||"ui-resizable-helper":null}),this.element[0].nodeName.match(/canvas|textarea|input|select|button|img/i)&&(this.element.wrap(t("<div class='ui-wrapper' style='overflow: hidden;'></div>").css({position:this.element.css("position"),width:this.element.outerWidth(),height:this.element.outerHeight(),top:this.element.css("top"),left:this.element.css("left")})),this.element=this.element.parent().data("ui-resizable",this.element.data("ui-resizable")),this.elementIsWrapper=!0,this.element.css({marginLeft:this.originalElement.css("marginLeft"),marginTop:this.originalElement.css("marginTop"),marginRight:this.originalElement.css("marginRight"),marginBottom:this.originalElement.css("marginBottom")}),this.originalElement.css({marginLeft:0,marginTop:0,marginRight:0,marginBottom:0}),this.originalResizeStyle=this.originalElement.css("resize"),this.originalElement.css("resize","none"),this._proportionallyResizeElements.push(this.originalElement.css({position:"static",zoom:1,display:"block"})),this.originalElement.css({margin:this.originalElement.css("margin")}),this._proportionallyResize()),this.handles=r.handles||(t(".ui-resizable-handle",this.element).length?{n:".ui-resizable-n",e:".ui-resizable-e",s:".ui-resizable-s",w:".ui-resizable-w",se:".ui-resizable-se",sw:".ui-resizable-sw",ne:".ui-resizable-ne",nw:".ui-resizable-nw"}:"e,s,se"),this.handles.constructor===String)for("all"===this.handles&&(this.handles="n,e,s,w,se,sw,ne,nw"),e=this.handles.split(","),this.handles={},i=0;e.length>i;i++)s=t.trim(e[i]),o="ui-resizable-"+s,n=t("<div class='ui-resizable-handle "+o+"'></div>"),n.css({zIndex:r.zIndex}),"se"===s&&n.addClass("ui-icon ui-icon-gripsmall-diagonal-se"),this.handles[s]=".ui-resizable-"+s,this.element.append(n);this._renderAxis=function(e){var i,s,n,o;e=e||this.element;for(i in this.handles)this.handles[i].constructor===String&&(this.handles[i]=t(this.handles[i],this.element).show()),this.elementIsWrapper&&this.originalElement[0].nodeName.match(/textarea|input|select|button/i)&&(s=t(this.handles[i],this.element),o=/sw|ne|nw|se|n|s/.test(i)?s.outerHeight():s.outerWidth(),n=["padding",/ne|nw|n/.test(i)?"Top":/se|sw|s/.test(i)?"Bottom":/^e$/.test(i)?"Right":"Left"].join(""),e.css(n,o),this._proportionallyResize()),t(this.handles[i]).length},this._renderAxis(this.element),this._handles=t(".ui-resizable-handle",this.element).disableSelection(),this._handles.mouseover(function(){a.resizing||(this.className&&(n=this.className.match(/ui-resizable-(se|sw|ne|nw|n|e|s|w)/i)),a.axis=n&&n[1]?n[1]:"se")}),r.autoHide&&(this._handles.hide(),t(this.element).addClass("ui-resizable-autohide").mouseenter(function(){r.disabled||(t(this).removeClass("ui-resizable-autohide"),a._handles.show())}).mouseleave(function(){r.disabled||a.resizing||(t(this).addClass("ui-resizable-autohide"),a._handles.hide())})),this._mouseInit()},_destroy:function(){this._mouseDestroy();var e,i=function(e){t(e).removeClass("ui-resizable ui-resizable-disabled ui-resizable-resizing").removeData("resizable").removeData("ui-resizable").unbind(".resizable").find(".ui-resizable-handle").remove()};return this.elementIsWrapper&&(i(this.element),e=this.element,this.originalElement.css({position:e.css("position"),width:e.outerWidth(),height:e.outerHeight(),top:e.css("top"),left:e.css("left")}).insertAfter(e),e.remove()),this.originalElement.css("resize",this.originalResizeStyle),i(this.originalElement),this},_mouseCapture:function(e){var i,s,n=!1;for(i in this.handles)s=t(this.handles[i])[0],(s===e.target||t.contains(s,e.target))&&(n=!0);return!this.options.disabled&&n},_mouseStart:function(i){var s,n,o,a=this.options,r=this.element.position(),h=this.element;return this.resizing=!0,/absolute/.test(h.css("position"))?h.css({position:"absolute",top:h.css("top"),left:h.css("left")}):h.is(".ui-draggable")&&h.css({position:"absolute",top:r.top,left:r.left}),this._renderProxy(),s=e(this.helper.css("left")),n=e(this.helper.css("top")),a.containment&&(s+=t(a.containment).scrollLeft()||0,n+=t(a.containment).scrollTop()||0),this.offset=this.helper.offset(),this.position={left:s,top:n},this.size=this._helper?{width:h.outerWidth(),height:h.outerHeight()}:{width:h.width(),height:h.height()},this.originalSize=this._helper?{width:h.outerWidth(),height:h.outerHeight()}:{width:h.width(),height:h.height()},this.originalPosition={left:s,top:n},this.sizeDiff={width:h.outerWidth()-h.width(),height:h.outerHeight()-h.height()},this.originalMousePosition={left:i.pageX,top:i.pageY},this.aspectRatio="number"==typeof a.aspectRatio?a.aspectRatio:this.originalSize.width/this.originalSize.height||1,o=t(".ui-resizable-"+this.axis).css("cursor"),t("body").css("cursor","auto"===o?this.axis+"-resize":o),h.addClass("ui-resizable-resizing"),this._propagate("start",i),!0},_mouseDrag:function(e){var i,s=this.helper,n={},o=this.originalMousePosition,a=this.axis,r=this.position.top,h=this.position.left,l=this.size.width,c=this.size.height,u=e.pageX-o.left||0,d=e.pageY-o.top||0,p=this._change[a];return p?(i=p.apply(this,[e,u,d]),this._updateVirtualBoundaries(e.shiftKey),(this._aspectRatio||e.shiftKey)&&(i=this._updateRatio(i,e)),i=this._respectSize(i,e),this._updateCache(i),this._propagate("resize",e),this.position.top!==r&&(n.top=this.position.top+"px"),this.position.left!==h&&(n.left=this.position.left+"px"),this.size.width!==l&&(n.width=this.size.width+"px"),this.size.height!==c&&(n.height=this.size.height+"px"),s.css(n),!this._helper&&this._proportionallyResizeElements.length&&this._proportionallyResize(),t.isEmptyObject(n)||this._trigger("resize",e,this.ui()),!1):!1},_mouseStop:function(e){this.resizing=!1;var i,s,n,o,a,r,h,l=this.options,c=this;return this._helper&&(i=this._proportionallyResizeElements,s=i.length&&/textarea/i.test(i[0].nodeName),n=s&&t.ui.hasScroll(i[0],"left")?0:c.sizeDiff.height,o=s?0:c.sizeDiff.width,a={width:c.helper.width()-o,height:c.helper.height()-n},r=parseInt(c.element.css("left"),10)+(c.position.left-c.originalPosition.left)||null,h=parseInt(c.element.css("top"),10)+(c.position.top-c.originalPosition.top)||null,l.animate||this.element.css(t.extend(a,{top:h,left:r})),c.helper.height(c.size.height),c.helper.width(c.size.width),this._helper&&!l.animate&&this._proportionallyResize()),t("body").css("cursor","auto"),this.element.removeClass("ui-resizable-resizing"),this._propagate("stop",e),this._helper&&this.helper.remove(),!1},_updateVirtualBoundaries:function(t){var e,s,n,o,a,r=this.options;a={minWidth:i(r.minWidth)?r.minWidth:0,maxWidth:i(r.maxWidth)?r.maxWidth:1/0,minHeight:i(r.minHeight)?r.minHeight:0,maxHeight:i(r.maxHeight)?r.maxHeight:1/0},(this._aspectRatio||t)&&(e=a.minHeight*this.aspectRatio,n=a.minWidth/this.aspectRatio,s=a.maxHeight*this.aspectRatio,o=a.maxWidth/this.aspectRatio,e>a.minWidth&&(a.minWidth=e),n>a.minHeight&&(a.minHeight=n),a.maxWidth>s&&(a.maxWidth=s),a.maxHeight>o&&(a.maxHeight=o)),this._vBoundaries=a},_updateCache:function(t){this.offset=this.helper.offset(),i(t.left)&&(this.position.left=t.left),i(t.top)&&(this.position.top=t.top),i(t.height)&&(this.size.height=t.height),i(t.width)&&(this.size.width=t.width)},_updateRatio:function(t){var e=this.position,s=this.size,n=this.axis;return i(t.height)?t.width=t.height*this.aspectRatio:i(t.width)&&(t.height=t.width/this.aspectRatio),"sw"===n&&(t.left=e.left+(s.width-t.width),t.top=null),"nw"===n&&(t.top=e.top+(s.height-t.height),t.left=e.left+(s.width-t.width)),t},_respectSize:function(t){var e=this._vBoundaries,s=this.axis,n=i(t.width)&&e.maxWidth&&e.maxWidth<t.width,o=i(t.height)&&e.maxHeight&&e.maxHeight<t.height,a=i(t.width)&&e.minWidth&&e.minWidth>t.width,r=i(t.height)&&e.minHeight&&e.minHeight>t.height,h=this.originalPosition.left+this.originalSize.width,l=this.position.top+this.size.height,c=/sw|nw|w/.test(s),u=/nw|ne|n/.test(s);return a&&(t.width=e.minWidth),r&&(t.height=e.minHeight),n&&(t.width=e.maxWidth),o&&(t.height=e.maxHeight),a&&c&&(t.left=h-e.minWidth),n&&c&&(t.left=h-e.maxWidth),r&&u&&(t.top=l-e.minHeight),o&&u&&(t.top=l-e.maxHeight),t.width||t.height||t.left||!t.top?t.width||t.height||t.top||!t.left||(t.left=null):t.top=null,t},_proportionallyResize:function(){if(this._proportionallyResizeElements.length){var t,e,i,s,n,o=this.helper||this.element;for(t=0;this._proportionallyResizeElements.length>t;t++){if(n=this._proportionallyResizeElements[t],!this.borderDif)for(this.borderDif=[],i=[n.css("borderTopWidth"),n.css("borderRightWidth"),n.css("borderBottomWidth"),n.css("borderLeftWidth")],s=[n.css("paddingTop"),n.css("paddingRight"),n.css("paddingBottom"),n.css("paddingLeft")],e=0;i.length>e;e++)this.borderDif[e]=(parseInt(i[e],10)||0)+(parseInt(s[e],10)||0);n.css({height:o.height()-this.borderDif[0]-this.borderDif[2]||0,width:o.width()-this.borderDif[1]-this.borderDif[3]||0})}}},_renderProxy:function(){var e=this.element,i=this.options;this.elementOffset=e.offset(),this._helper?(this.helper=this.helper||t("<div style='overflow:hidden;'></div>"),this.helper.addClass(this._helper).css({width:this.element.outerWidth()-1,height:this.element.outerHeight()-1,position:"absolute",left:this.elementOffset.left+"px",top:this.elementOffset.top+"px",zIndex:++i.zIndex}),this.helper.appendTo("body").disableSelection()):this.helper=this.element},_change:{e:function(t,e){return{width:this.originalSize.width+e}},w:function(t,e){var i=this.originalSize,s=this.originalPosition;return{left:s.left+e,width:i.width-e}},n:function(t,e,i){var s=this.originalSize,n=this.originalPosition;return{top:n.top+i,height:s.height-i}},s:function(t,e,i){return{height:this.originalSize.height+i}},se:function(e,i,s){return t.extend(this._change.s.apply(this,arguments),this._change.e.apply(this,[e,i,s]))},sw:function(e,i,s){return t.extend(this._change.s.apply(this,arguments),this._change.w.apply(this,[e,i,s]))},ne:function(e,i,s){return t.extend(this._change.n.apply(this,arguments),this._change.e.apply(this,[e,i,s]))},nw:function(e,i,s){return t.extend(this._change.n.apply(this,arguments),this._change.w.apply(this,[e,i,s]))}},_propagate:function(e,i){t.ui.plugin.call(this,e,[i,this.ui()]),"resize"!==e&&this._trigger(e,i,this.ui())},plugins:{},ui:function(){return{originalElement:this.originalElement,element:this.element,helper:this.helper,position:this.position,size:this.size,originalSize:this.originalSize,originalPosition:this.originalPosition}}}),t.ui.plugin.add("resizable","animate",{stop:function(e){var i=t(this).data("ui-resizable"),s=i.options,n=i._proportionallyResizeElements,o=n.length&&/textarea/i.test(n[0].nodeName),a=o&&t.ui.hasScroll(n[0],"left")?0:i.sizeDiff.height,r=o?0:i.sizeDiff.width,h={width:i.size.width-r,height:i.size.height-a},l=parseInt(i.element.css("left"),10)+(i.position.left-i.originalPosition.left)||null,c=parseInt(i.element.css("top"),10)+(i.position.top-i.originalPosition.top)||null;i.element.animate(t.extend(h,c&&l?{top:c,left:l}:{}),{duration:s.animateDuration,easing:s.animateEasing,step:function(){var s={width:parseInt(i.element.css("width"),10),height:parseInt(i.element.css("height"),10),top:parseInt(i.element.css("top"),10),left:parseInt(i.element.css("left"),10)};n&&n.length&&t(n[0]).css({width:s.width,height:s.height}),i._updateCache(s),i._propagate("resize",e)}})}}),t.ui.plugin.add("resizable","containment",{start:function(){var i,s,n,o,a,r,h,l=t(this).data("ui-resizable"),c=l.options,u=l.element,d=c.containment,p=d instanceof t?d.get(0):/parent/.test(d)?u.parent().get(0):d;p&&(l.containerElement=t(p),/document/.test(d)||d===document?(l.containerOffset={left:0,top:0},l.containerPosition={left:0,top:0},l.parentData={element:t(document),left:0,top:0,width:t(document).width(),height:t(document).height()||document.body.parentNode.scrollHeight}):(i=t(p),s=[],t(["Top","Right","Left","Bottom"]).each(function(t,n){s[t]=e(i.css("padding"+n))}),l.containerOffset=i.offset(),l.containerPosition=i.position(),l.containerSize={height:i.innerHeight()-s[3],width:i.innerWidth()-s[1]},n=l.containerOffset,o=l.containerSize.height,a=l.containerSize.width,r=t.ui.hasScroll(p,"left")?p.scrollWidth:a,h=t.ui.hasScroll(p)?p.scrollHeight:o,l.parentData={element:p,left:n.left,top:n.top,width:r,height:h}))},resize:function(e){var i,s,n,o,a=t(this).data("ui-resizable"),r=a.options,h=a.containerOffset,l=a.position,c=a._aspectRatio||e.shiftKey,u={top:0,left:0},d=a.containerElement;d[0]!==document&&/static/.test(d.css("position"))&&(u=h),l.left<(a._helper?h.left:0)&&(a.size.width=a.size.width+(a._helper?a.position.left-h.left:a.position.left-u.left),c&&(a.size.height=a.size.width/a.aspectRatio),a.position.left=r.helper?h.left:0),l.top<(a._helper?h.top:0)&&(a.size.height=a.size.height+(a._helper?a.position.top-h.top:a.position.top),c&&(a.size.width=a.size.height*a.aspectRatio),a.position.top=a._helper?h.top:0),a.offset.left=a.parentData.left+a.position.left,a.offset.top=a.parentData.top+a.position.top,i=Math.abs((a._helper?a.offset.left-u.left:a.offset.left-u.left)+a.sizeDiff.width),s=Math.abs((a._helper?a.offset.top-u.top:a.offset.top-h.top)+a.sizeDiff.height),n=a.containerElement.get(0)===a.element.parent().get(0),o=/relative|absolute/.test(a.containerElement.css("position")),n&&o&&(i-=a.parentData.left),i+a.size.width>=a.parentData.width&&(a.size.width=a.parentData.width-i,c&&(a.size.height=a.size.width/a.aspectRatio)),s+a.size.height>=a.parentData.height&&(a.size.height=a.parentData.height-s,c&&(a.size.width=a.size.height*a.aspectRatio))},stop:function(){var e=t(this).data("ui-resizable"),i=e.options,s=e.containerOffset,n=e.containerPosition,o=e.containerElement,a=t(e.helper),r=a.offset(),h=a.outerWidth()-e.sizeDiff.width,l=a.outerHeight()-e.sizeDiff.height;e._helper&&!i.animate&&/relative/.test(o.css("position"))&&t(this).css({left:r.left-n.left-s.left,width:h,height:l}),e._helper&&!i.animate&&/static/.test(o.css("position"))&&t(this).css({left:r.left-n.left-s.left,width:h,height:l})}}),t.ui.plugin.add("resizable","alsoResize",{start:function(){var e=t(this).data("ui-resizable"),i=e.options,s=function(e){t(e).each(function(){var e=t(this);e.data("ui-resizable-alsoresize",{width:parseInt(e.width(),10),height:parseInt(e.height(),10),left:parseInt(e.css("left"),10),top:parseInt(e.css("top"),10)})})};"object"!=typeof i.alsoResize||i.alsoResize.parentNode?s(i.alsoResize):i.alsoResize.length?(i.alsoResize=i.alsoResize[0],s(i.alsoResize)):t.each(i.alsoResize,function(t){s(t)})},resize:function(e,i){var s=t(this).data("ui-resizable"),n=s.options,o=s.originalSize,a=s.originalPosition,r={height:s.size.height-o.height||0,width:s.size.width-o.width||0,top:s.position.top-a.top||0,left:s.position.left-a.left||0},h=function(e,s){t(e).each(function(){var e=t(this),n=t(this).data("ui-resizable-alsoresize"),o={},a=s&&s.length?s:e.parents(i.originalElement[0]).length?["width","height"]:["width","height","top","left"];t.each(a,function(t,e){var i=(n[e]||0)+(r[e]||0);i&&i>=0&&(o[e]=i||null)}),e.css(o)})};"object"!=typeof n.alsoResize||n.alsoResize.nodeType?h(n.alsoResize):t.each(n.alsoResize,function(t,e){h(t,e)})},stop:function(){t(this).removeData("resizable-alsoresize")}}),t.ui.plugin.add("resizable","ghost",{start:function(){var e=t(this).data("ui-resizable"),i=e.options,s=e.size;e.ghost=e.originalElement.clone(),e.ghost.css({opacity:.25,display:"block",position:"relative",height:s.height,width:s.width,margin:0,left:0,top:0}).addClass("ui-resizable-ghost").addClass("string"==typeof i.ghost?i.ghost:""),e.ghost.appendTo(e.helper)},resize:function(){var e=t(this).data("ui-resizable");e.ghost&&e.ghost.css({position:"relative",height:e.size.height,width:e.size.width})},stop:function(){var e=t(this).data("ui-resizable");e.ghost&&e.helper&&e.helper.get(0).removeChild(e.ghost.get(0))}}),t.ui.plugin.add("resizable","grid",{resize:function(){var e=t(this).data("ui-resizable"),i=e.options,s=e.size,n=e.originalSize,o=e.originalPosition,a=e.axis,r="number"==typeof i.grid?[i.grid,i.grid]:i.grid,h=r[0]||1,l=r[1]||1,c=Math.round((s.width-n.width)/h)*h,u=Math.round((s.height-n.height)/l)*l,d=n.width+c,p=n.height+u,f=i.maxWidth&&d>i.maxWidth,g=i.maxHeight&&p>i.maxHeight,m=i.minWidth&&i.minWidth>d,v=i.minHeight&&i.minHeight>p;i.grid=r,m&&(d+=h),v&&(p+=l),f&&(d-=h),g&&(p-=l),/^(se|s|e)$/.test(a)?(e.size.width=d,e.size.height=p):/^(ne)$/.test(a)?(e.size.width=d,e.size.height=p,e.position.top=o.top-u):/^(sw)$/.test(a)?(e.size.width=d,e.size.height=p,e.position.left=o.left-c):(e.size.width=d,e.size.height=p,e.position.top=o.top-u,e.position.left=o.left-c)}})}(jQuery),function(t){t.widget("ui.selectable",t.ui.mouse,{version:"1.10.2",options:{appendTo:"body",autoRefresh:!0,distance:0,filter:"*",tolerance:"touch",selected:null,selecting:null,start:null,stop:null,unselected:null,unselecting:null},_create:function(){var e,i=this;this.element.addClass("ui-selectable"),this.dragged=!1,this.refresh=function(){e=t(i.options.filter,i.element[0]),e.addClass("ui-selectee"),e.each(function(){var e=t(this),i=e.offset();t.data(this,"selectable-item",{element:this,$element:e,left:i.left,top:i.top,right:i.left+e.outerWidth(),bottom:i.top+e.outerHeight(),startselected:!1,selected:e.hasClass("ui-selected"),selecting:e.hasClass("ui-selecting"),unselecting:e.hasClass("ui-unselecting")})})},this.refresh(),this.selectees=e.addClass("ui-selectee"),this._mouseInit(),this.helper=t("<div class='ui-selectable-helper'></div>")},_destroy:function(){this.selectees.removeClass("ui-selectee").removeData("selectable-item"),this.element.removeClass("ui-selectable ui-selectable-disabled"),this._mouseDestroy()},_mouseStart:function(e){var i=this,s=this.options;this.opos=[e.pageX,e.pageY],this.options.disabled||(this.selectees=t(s.filter,this.element[0]),this._trigger("start",e),t(s.appendTo).append(this.helper),this.helper.css({left:e.pageX,top:e.pageY,width:0,height:0}),s.autoRefresh&&this.refresh(),this.selectees.filter(".ui-selected").each(function(){var s=t.data(this,"selectable-item");s.startselected=!0,e.metaKey||e.ctrlKey||(s.$element.removeClass("ui-selected"),s.selected=!1,s.$element.addClass("ui-unselecting"),s.unselecting=!0,i._trigger("unselecting",e,{unselecting:s.element}))}),t(e.target).parents().addBack().each(function(){var s,n=t.data(this,"selectable-item");return n?(s=!e.metaKey&&!e.ctrlKey||!n.$element.hasClass("ui-selected"),n.$element.removeClass(s?"ui-unselecting":"ui-selected").addClass(s?"ui-selecting":"ui-unselecting"),n.unselecting=!s,n.selecting=s,n.selected=s,s?i._trigger("selecting",e,{selecting:n.element}):i._trigger("unselecting",e,{unselecting:n.element}),!1):undefined}))},_mouseDrag:function(e){if(this.dragged=!0,!this.options.disabled){var i,s=this,n=this.options,o=this.opos[0],a=this.opos[1],r=e.pageX,h=e.pageY;return o>r&&(i=r,r=o,o=i),a>h&&(i=h,h=a,a=i),this.helper.css({left:o,top:a,width:r-o,height:h-a}),this.selectees.each(function(){var i=t.data(this,"selectable-item"),l=!1;i&&i.element!==s.element[0]&&("touch"===n.tolerance?l=!(i.left>r||o>i.right||i.top>h||a>i.bottom):"fit"===n.tolerance&&(l=i.left>o&&r>i.right&&i.top>a&&h>i.bottom),l?(i.selected&&(i.$element.removeClass("ui-selected"),i.selected=!1),i.unselecting&&(i.$element.removeClass("ui-unselecting"),i.unselecting=!1),i.selecting||(i.$element.addClass("ui-selecting"),i.selecting=!0,s._trigger("selecting",e,{selecting:i.element}))):(i.selecting&&((e.metaKey||e.ctrlKey)&&i.startselected?(i.$element.removeClass("ui-selecting"),i.selecting=!1,i.$element.addClass("ui-selected"),i.selected=!0):(i.$element.removeClass("ui-selecting"),i.selecting=!1,i.startselected&&(i.$element.addClass("ui-unselecting"),i.unselecting=!0),s._trigger("unselecting",e,{unselecting:i.element}))),i.selected&&(e.metaKey||e.ctrlKey||i.startselected||(i.$element.removeClass("ui-selected"),i.selected=!1,i.$element.addClass("ui-unselecting"),i.unselecting=!0,s._trigger("unselecting",e,{unselecting:i.element})))))}),!1}},_mouseStop:function(e){var 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this.reverting?!1:this.options.disabled||"static"===this.options.type?!1:(this._refreshItems(e),t(e.target).parents().each(function(){return t.data(this,o.widgetName+"-item")===o?(s=t(this),!1):undefined}),t.data(e.target,o.widgetName+"-item")===o&&(s=t(e.target)),s?!this.options.handle||i||(t(this.options.handle,s).find("*").addBack().each(function(){this===e.target&&(n=!0)}),n)?(this.currentItem=s,this._removeCurrentsFromItems(),!0):!1:!1)},_mouseStart:function(e,i,s){var n,o,a=this.options;if(this.currentContainer=this,this.refreshPositions(),this.helper=this._createHelper(e),this._cacheHelperProportions(),this._cacheMargins(),this.scrollParent=this.helper.scrollParent(),this.offset=this.currentItem.offset(),this.offset={top:this.offset.top-this.margins.top,left:this.offset.left-this.margins.left},t.extend(this.offset,{click:{left:e.pageX-this.offset.left,top:e.pageY-this.offset.top},parent:this._getParentOffset(),relative:this._getRelativeOffset()}),this.helper.css("position","absolute"),this.cssPosition=this.helper.css("position"),this.originalPosition=this._generatePosition(e),this.originalPageX=e.pageX,this.originalPageY=e.pageY,a.cursorAt&&this._adjustOffsetFromHelper(a.cursorAt),this.domPosition={prev:this.currentItem.prev()[0],parent:this.currentItem.parent()[0]},this.helper[0]!==this.currentItem[0]&&this.currentItem.hide(),this._createPlaceholder(),a.containment&&this._setContainment(),a.cursor&&"auto"!==a.cursor&&(o=this.document.find("body"),this.storedCursor=o.css("cursor"),o.css("cursor",a.cursor),this.storedStylesheet=t("<style>*{ cursor: "+a.cursor+" !important; }</style>").appendTo(o)),a.opacity&&(this.helper.css("opacity")&&(this._storedOpacity=this.helper.css("opacity")),this.helper.css("opacity",a.opacity)),a.zIndex&&(this.helper.css("zIndex")&&(this._storedZIndex=this.helper.css("zIndex")),this.helper.css("zIndex",a.zIndex)),this.scrollParent[0]!==document&&"HTML"!==this.scrollParent[0].tagName&&(this.overflowOffset=this.scrollParent.offset()),this._trigger("start",e,this._uiHash()),this._preserveHelperProportions||this._cacheHelperProportions(),!s)for(n=this.containers.length-1;n>=0;n--)this.containers[n]._trigger("activate",e,this._uiHash(this));return t.ui.ddmanager&&(t.ui.ddmanager.current=this),t.ui.ddmanager&&!a.dropBehaviour&&t.ui.ddmanager.prepareOffsets(this,e),this.dragging=!0,this.helper.addClass("ui-sortable-helper"),this._mouseDrag(e),!0},_mouseDrag:function(e){var i,s,n,o,a=this.options,r=!1;for(this.position=this._generatePosition(e),this.positionAbs=this._convertPositionTo("absolute"),this.lastPositionAbs||(this.lastPositionAbs=this.positionAbs),this.options.scroll&&(this.scrollParent[0]!==document&&"HTML"!==this.scrollParent[0].tagName?(this.overflowOffset.top+this.scrollParent[0].offsetHeight-e.pageY<a.scrollSensitivity?this.scrollParent[0].scrollTop=r=this.scrollParent[0].scrollTop+a.scrollSpeed:e.pageY-this.overflowOffset.top<a.scrollSensitivity&&(this.scrollParent[0].scrollTop=r=this.scrollParent[0].scrollTop-a.scrollSpeed),this.overflowOffset.left+this.scrollParent[0].offsetWidth-e.pageX<a.scrollSensitivity?this.scrollParent[0].scrollLeft=r=this.scrollParent[0].scrollLeft+a.scrollSpeed:e.pageX-this.overflowOffset.left<a.scrollSensitivity&&(this.scrollParent[0].scrollLeft=r=this.scrollParent[0].scrollLeft-a.scrollSpeed)):(e.pageY-t(document).scrollTop()<a.scrollSensitivity?r=t(document).scrollTop(t(document).scrollTop()-a.scrollSpeed):t(window).height()-(e.pageY-t(document).scrollTop())<a.scrollSensitivity&&(r=t(document).scrollTop(t(document).scrollTop()+a.scrollSpeed)),e.pageX-t(document).scrollLeft()<a.scrollSensitivity?r=t(document).scrollLeft(t(document).scrollLeft()-a.scrollSpeed):t(window).width()-(e.pageX-t(document).scrollLeft())<a.scrollSensitivity&&(r=t(document).scrollLeft(t(document).scrollLeft()+a.scrollSpeed))),r!==!1&&t.ui.ddmanager&&!a.dropBehaviour&&t.ui.ddmanager.prepareOffsets(this,e)),this.positionAbs=this._convertPositionTo("absolute"),this.options.axis&&"y"===this.options.axis||(this.helper[0].style.left=this.position.left+"px"),this.options.axis&&"x"===this.options.axis||(this.helper[0].style.top=this.position.top+"px"),i=this.items.length-1;i>=0;i--)if(s=this.items[i],n=s.item[0],o=this._intersectsWithPointer(s),o&&s.instance===this.currentContainer&&n!==this.currentItem[0]&&this.placeholder[1===o?"next":"prev"]()[0]!==n&&!t.contains(this.placeholder[0],n)&&("semi-dynamic"===this.options.type?!t.contains(this.element[0],n):!0)){if(this.direction=1===o?"down":"up","pointer"!==this.options.tolerance&&!this._intersectsWithSides(s))break;this._rearrange(e,s),this._trigger("change",e,this._uiHash());break}return this._contactContainers(e),t.ui.ddmanager&&t.ui.ddmanager.drag(this,e),this._trigger("sort",e,this._uiHash()),this.lastPositionAbs=this.positionAbs,!1},_mouseStop:function(e,i){if(e){if(t.ui.ddmanager&&!this.options.dropBehaviour&&t.ui.ddmanager.drop(this,e),this.options.revert){var s=this,n=this.placeholder.offset(),o=this.options.axis,a={};o&&"x"!==o||(a.left=n.left-this.offset.parent.left-this.margins.left+(this.offsetParent[0]===document.body?0:this.offsetParent[0].scrollLeft)),o&&"y"!==o||(a.top=n.top-this.offset.parent.top-this.margins.top+(this.offsetParent[0]===document.body?0:this.offsetParent[0].scrollTop)),this.reverting=!0,t(this.helper).animate(a,parseInt(this.options.revert,10)||500,function(){s._clear(e)})}else this._clear(e,i);return!1}},cancel:function(){if(this.dragging){this._mouseUp({target:null}),"original"===this.options.helper?this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper"):this.currentItem.show();for(var e=this.containers.length-1;e>=0;e--)this.containers[e]._trigger("deactivate",null,this._uiHash(this)),this.containers[e].containerCache.over&&(this.containers[e]._trigger("out",null,this._uiHash(this)),this.containers[e].containerCache.over=0)}return this.placeholder&&(this.placeholder[0].parentNode&&this.placeholder[0].parentNode.removeChild(this.placeholder[0]),"original"!==this.options.helper&&this.helper&&this.helper[0].parentNode&&this.helper.remove(),t.extend(this,{helper:null,dragging:!1,reverting:!1,_noFinalSort:null}),this.domPosition.prev?t(this.domPosition.prev).after(this.currentItem):t(this.domPosition.parent).prepend(this.currentItem)),this},serialize:function(e){var i=this._getItemsAsjQuery(e&&e.connected),s=[];return e=e||{},t(i).each(function(){var i=(t(e.item||this).attr(e.attribute||"id")||"").match(e.expression||/(.+)[\-=_](.+)/);i&&s.push((e.key||i[1]+"[]")+"="+(e.key&&e.expression?i[1]:i[2]))}),!s.length&&e.key&&s.push(e.key+"="),s.join("&")},toArray:function(e){var i=this._getItemsAsjQuery(e&&e.connected),s=[];return e=e||{},i.each(function(){s.push(t(e.item||this).attr(e.attribute||"id")||"")}),s},_intersectsWith:function(t){var e=this.positionAbs.left,i=e+this.helperProportions.width,s=this.positionAbs.top,n=s+this.helperProportions.height,o=t.left,a=o+t.width,r=t.top,h=r+t.height,l=this.offset.click.top,c=this.offset.click.left,u=s+l>r&&h>s+l&&e+c>o&&a>e+c;return"pointer"===this.options.tolerance||this.options.forcePointerForContainers||"pointer"!==this.options.tolerance&&this.helperProportions[this.floating?"width":"height"]>t[this.floating?"width":"height"]?u:e+this.helperProportions.width/2>o&&a>i-this.helperProportions.width/2&&s+this.helperProportions.height/2>r&&h>n-this.helperProportions.height/2},_intersectsWithPointer:function(t){var i="x"===this.options.axis||e(this.positionAbs.top+this.offset.click.top,t.top,t.height),s="y"===this.options.axis||e(this.positionAbs.left+this.offset.click.left,t.left,t.width),n=i&&s,o=this._getDragVerticalDirection(),a=this._getDragHorizontalDirection();return n?this.floating?a&&"right"===a||"down"===o?2:1:o&&("down"===o?2:1):!1},_intersectsWithSides:function(t){var i=e(this.positionAbs.top+this.offset.click.top,t.top+t.height/2,t.height),s=e(this.positionAbs.left+this.offset.click.left,t.left+t.width/2,t.width),n=this._getDragVerticalDirection(),o=this._getDragHorizontalDirection();return this.floating&&o?"right"===o&&s||"left"===o&&!s:n&&("down"===n&&i||"up"===n&&!i)},_getDragVerticalDirection:function(){var t=this.positionAbs.top-this.lastPositionAbs.top;return 0!==t&&(t>0?"down":"up")},_getDragHorizontalDirection:function(){var t=this.positionAbs.left-this.lastPositionAbs.left;return 0!==t&&(t>0?"right":"left")},refresh:function(t){return this._refreshItems(t),this.refreshPositions(),this},_connectWith:function(){var t=this.options;return t.connectWith.constructor===String?[t.connectWith]:t.connectWith},_getItemsAsjQuery:function(e){var i,s,n,o,a=[],r=[],h=this._connectWith();if(h&&e)for(i=h.length-1;i>=0;i--)for(n=t(h[i]),s=n.length-1;s>=0;s--)o=t.data(n[s],this.widgetFullName),o&&o!==this&&!o.options.disabled&&r.push([t.isFunction(o.options.items)?o.options.items.call(o.element):t(o.options.items,o.element).not(".ui-sortable-helper").not(".ui-sortable-placeholder"),o]);for(r.push([t.isFunction(this.options.items)?this.options.items.call(this.element,null,{options:this.options,item:this.currentItem}):t(this.options.items,this.element).not(".ui-sortable-helper").not(".ui-sortable-placeholder"),this]),i=r.length-1;i>=0;i--)r[i][0].each(function(){a.push(this)});return t(a)},_removeCurrentsFromItems:function(){var e=this.currentItem.find(":data("+this.widgetName+"-item)");this.items=t.grep(this.items,function(t){for(var i=0;e.length>i;i++)if(e[i]===t.item[0])return!1;return!0})},_refreshItems:function(e){this.items=[],this.containers=[this];var i,s,n,o,a,r,h,l,c=this.items,u=[[t.isFunction(this.options.items)?this.options.items.call(this.element[0],e,{item:this.currentItem}):t(this.options.items,this.element),this]],d=this._connectWith();if(d&&this.ready)for(i=d.length-1;i>=0;i--)for(n=t(d[i]),s=n.length-1;s>=0;s--)o=t.data(n[s],this.widgetFullName),o&&o!==this&&!o.options.disabled&&(u.push([t.isFunction(o.options.items)?o.options.items.call(o.element[0],e,{item:this.currentItem}):t(o.options.items,o.element),o]),this.containers.push(o));for(i=u.length-1;i>=0;i--)for(a=u[i][1],r=u[i][0],s=0,l=r.length;l>s;s++)h=t(r[s]),h.data(this.widgetName+"-item",a),c.push({item:h,instance:a,width:0,height:0,left:0,top:0})},refreshPositions:function(e){this.offsetParent&&this.helper&&(this.offset.parent=this._getParentOffset());var i,s,n,o;for(i=this.items.length-1;i>=0;i--)s=this.items[i],s.instance!==this.currentContainer&&this.currentContainer&&s.item[0]!==this.currentItem[0]||(n=this.options.toleranceElement?t(this.options.toleranceElement,s.item):s.item,e||(s.width=n.outerWidth(),s.height=n.outerHeight()),o=n.offset(),s.left=o.left,s.top=o.top);if(this.options.custom&&this.options.custom.refreshContainers)this.options.custom.refreshContainers.call(this);else for(i=this.containers.length-1;i>=0;i--)o=this.containers[i].element.offset(),this.containers[i].containerCache.left=o.left,this.containers[i].containerCache.top=o.top,this.containers[i].containerCache.width=this.containers[i].element.outerWidth(),this.containers[i].containerCache.height=this.containers[i].element.outerHeight();return this},_createPlaceholder:function(e){e=e||this;var i,s=e.options;s.placeholder&&s.placeholder.constructor!==String||(i=s.placeholder,s.placeholder={element:function(){var s=e.currentItem[0].nodeName.toLowerCase(),n=t(e.document[0].createElement(s)).addClass(i||e.currentItem[0].className+" ui-sortable-placeholder").removeClass("ui-sortable-helper");return"tr"===s?n.append("<td colspan='99'>&#160;</td>"):"img"===s&&n.attr("src",e.currentItem.attr("src")),i||n.css("visibility","hidden"),n},update:function(t,n){(!i||s.forcePlaceholderSize)&&(n.height()||n.height(e.currentItem.innerHeight()-parseInt(e.currentItem.css("paddingTop")||0,10)-parseInt(e.currentItem.css("paddingBottom")||0,10)),n.width()||n.width(e.currentItem.innerWidth()-parseInt(e.currentItem.css("paddingLeft")||0,10)-parseInt(e.currentItem.css("paddingRight")||0,10)))}}),e.placeholder=t(s.placeholder.element.call(e.element,e.currentItem)),e.currentItem.after(e.placeholder),s.placeholder.update(e,e.placeholder)},_contactContainers:function(s){var n,o,a,r,h,l,c,u,d,p,f=null,g=null;for(n=this.containers.length-1;n>=0;n--)if(!t.contains(this.currentItem[0],this.containers[n].element[0]))if(this._intersectsWith(this.containers[n].containerCache)){if(f&&t.contains(this.containers[n].element[0],f.element[0]))continue;f=this.containers[n],g=n}else this.containers[n].containerCache.over&&(this.containers[n]._trigger("out",s,this._uiHash(this)),this.containers[n].containerCache.over=0);if(f)if(1===this.containers.length)this.containers[g].containerCache.over||(this.containers[g]._trigger("over",s,this._uiHash(this)),this.containers[g].containerCache.over=1);else{for(a=1e4,r=null,p=f.floating||i(this.currentItem),h=p?"left":"top",l=p?"width":"height",c=this.positionAbs[h]+this.offset.click[h],o=this.items.length-1;o>=0;o--)t.contains(this.containers[g].element[0],this.items[o].item[0])&&this.items[o].item[0]!==this.currentItem[0]&&(!p||e(this.positionAbs.top+this.offset.click.top,this.items[o].top,this.items[o].height))&&(u=this.items[o].item.offset()[h],d=!1,Math.abs(u-c)>Math.abs(u+this.items[o][l]-c)&&(d=!0,u+=this.items[o][l]),a>Math.abs(u-c)&&(a=Math.abs(u-c),r=this.items[o],this.direction=d?"up":"down"));if(!r&&!this.options.dropOnEmpty)return;if(this.currentContainer===this.containers[g])return;r?this._rearrange(s,r,null,!0):this._rearrange(s,null,this.containers[g].element,!0),this._trigger("change",s,this._uiHash()),this.containers[g]._trigger("change",s,this._uiHash(this)),this.currentContainer=this.containers[g],this.options.placeholder.update(this.currentContainer,this.placeholder),this.containers[g]._trigger("over",s,this._uiHash(this)),this.containers[g].containerCache.over=1}},_createHelper:function(e){var i=this.options,s=t.isFunction(i.helper)?t(i.helper.apply(this.element[0],[e,this.currentItem])):"clone"===i.helper?this.currentItem.clone():this.currentItem;return s.parents("body").length||t("parent"!==i.appendTo?i.appendTo:this.currentItem[0].parentNode)[0].appendChild(s[0]),s[0]===this.currentItem[0]&&(this._storedCSS={width:this.currentItem[0].style.width,height:this.currentItem[0].style.height,position:this.currentItem.css("position"),top:this.currentItem.css("top"),left:this.currentItem.css("left")}),(!s[0].style.width||i.forceHelperSize)&&s.width(this.currentItem.width()),(!s[0].style.height||i.forceHelperSize)&&s.height(this.currentItem.height()),s},_adjustOffsetFromHelper:function(e){"string"==typeof e&&(e=e.split(" ")),t.isArray(e)&&(e={left:+e[0],top:+e[1]||0}),"left"in e&&(this.offset.click.left=e.left+this.margins.left),"right"in e&&(this.offset.click.left=this.helperProportions.width-e.right+this.margins.left),"top"in e&&(this.offset.click.top=e.top+this.margins.top),"bottom"in e&&(this.offset.click.top=this.helperProportions.height-e.bottom+this.margins.top)},_getParentOffset:function(){this.offsetParent=this.helper.offsetParent();var e=this.offsetParent.offset();return"absolute"===this.cssPosition&&this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])&&(e.left+=this.scrollParent.scrollLeft(),e.top+=this.scrollParent.scrollTop()),(this.offsetParent[0]===document.body||this.offsetParent[0].tagName&&"html"===this.offsetParent[0].tagName.toLowerCase()&&t.ui.ie)&&(e={top:0,left:0}),{top:e.top+(parseInt(this.offsetParent.css("borderTopWidth"),10)||0),left:e.left+(parseInt(this.offsetParent.css("borderLeftWidth"),10)||0)}},_getRelativeOffset:function(){if("relative"===this.cssPosition){var t=this.currentItem.position();return{top:t.top-(parseInt(this.helper.css("top"),10)||0)+this.scrollParent.scrollTop(),left:t.left-(parseInt(this.helper.css("left"),10)||0)+this.scrollParent.scrollLeft()}}return{top:0,left:0}},_cacheMargins:function(){this.margins={left:parseInt(this.currentItem.css("marginLeft"),10)||0,top:parseInt(this.currentItem.css("marginTop"),10)||0}},_cacheHelperProportions:function(){this.helperProportions={width:this.helper.outerWidth(),height:this.helper.outerHeight()}},_setContainment:function(){var e,i,s,n=this.options;"parent"===n.containment&&(n.containment=this.helper[0].parentNode),("document"===n.containment||"window"===n.containment)&&(this.containment=[0-this.offset.relative.left-this.offset.parent.left,0-this.offset.relative.top-this.offset.parent.top,t("document"===n.containment?document:window).width()-this.helperProportions.width-this.margins.left,(t("document"===n.containment?document:window).height()||document.body.parentNode.scrollHeight)-this.helperProportions.height-this.margins.top]),/^(document|window|parent)$/.test(n.containment)||(e=t(n.containment)[0],i=t(n.containment).offset(),s="hidden"!==t(e).css("overflow"),this.containment=[i.left+(parseInt(t(e).css("borderLeftWidth"),10)||0)+(parseInt(t(e).css("paddingLeft"),10)||0)-this.margins.left,i.top+(parseInt(t(e).css("borderTopWidth"),10)||0)+(parseInt(t(e).css("paddingTop"),10)||0)-this.margins.top,i.left+(s?Math.max(e.scrollWidth,e.offsetWidth):e.offsetWidth)-(parseInt(t(e).css("borderLeftWidth"),10)||0)-(parseInt(t(e).css("paddingRight"),10)||0)-this.helperProportions.width-this.margins.left,i.top+(s?Math.max(e.scrollHeight,e.offsetHeight):e.offsetHeight)-(parseInt(t(e).css("borderTopWidth"),10)||0)-(parseInt(t(e).css("paddingBottom"),10)||0)-this.helperProportions.height-this.margins.top])},_convertPositionTo:function(e,i){i||(i=this.position);var s="absolute"===e?1:-1,n="absolute"!==this.cssPosition||this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])?this.scrollParent:this.offsetParent,o=/(html|body)/i.test(n[0].tagName);return{top:i.top+this.offset.relative.top*s+this.offset.parent.top*s-("fixed"===this.cssPosition?-this.scrollParent.scrollTop():o?0:n.scrollTop())*s,left:i.left+this.offset.relative.left*s+this.offset.parent.left*s-("fixed"===this.cssPosition?-this.scrollParent.scrollLeft():o?0:n.scrollLeft())*s}},_generatePosition:function(e){var i,s,n=this.options,o=e.pageX,a=e.pageY,r="absolute"!==this.cssPosition||this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])?this.scrollParent:this.offsetParent,h=/(html|body)/i.test(r[0].tagName);return"relative"!==this.cssPosition||this.scrollParent[0]!==document&&this.scrollParent[0]!==this.offsetParent[0]||(this.offset.relative=this._getRelativeOffset()),this.originalPosition&&(this.containment&&(e.pageX-this.offset.click.left<this.containment[0]&&(o=this.containment[0]+this.offset.click.left),e.pageY-this.offset.click.top<this.containment[1]&&(a=this.containment[1]+this.offset.click.top),e.pageX-this.offset.click.left>this.containment[2]&&(o=this.containment[2]+this.offset.click.left),e.pageY-this.offset.click.top>this.containment[3]&&(a=this.containment[3]+this.offset.click.top)),n.grid&&(i=this.originalPageY+Math.round((a-this.originalPageY)/n.grid[1])*n.grid[1],a=this.containment?i-this.offset.click.top>=this.containment[1]&&i-this.offset.click.top<=this.containment[3]?i:i-this.offset.click.top>=this.containment[1]?i-n.grid[1]:i+n.grid[1]:i,s=this.originalPageX+Math.round((o-this.originalPageX)/n.grid[0])*n.grid[0],o=this.containment?s-this.offset.click.left>=this.containment[0]&&s-this.offset.click.left<=this.containment[2]?s:s-this.offset.click.left>=this.containment[0]?s-n.grid[0]:s+n.grid[0]:s)),{top:a-this.offset.click.top-this.offset.relative.top-this.offset.parent.top+("fixed"===this.cssPosition?-this.scrollParent.scrollTop():h?0:r.scrollTop()),left:o-this.offset.click.left-this.offset.relative.left-this.offset.parent.left+("fixed"===this.cssPosition?-this.scrollParent.scrollLeft():h?0:r.scrollLeft())}},_rearrange:function(t,e,i,s){i?i[0].appendChild(this.placeholder[0]):e.item[0].parentNode.insertBefore(this.placeholder[0],"down"===this.direction?e.item[0]:e.item[0].nextSibling),this.counter=this.counter?++this.counter:1;var n=this.counter;this._delay(function(){n===this.counter&&this.refreshPositions(!s)})},_clear:function(t,e){this.reverting=!1;var i,s=[];if(!this._noFinalSort&&this.currentItem.parent().length&&this.placeholder.before(this.currentItem),this._noFinalSort=null,this.helper[0]===this.currentItem[0]){for(i in this._storedCSS)("auto"===this._storedCSS[i]||"static"===this._storedCSS[i])&&(this._storedCSS[i]="");this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper")}else this.currentItem.show();for(this.fromOutside&&!e&&s.push(function(t){this._trigger("receive",t,this._uiHash(this.fromOutside))}),!this.fromOutside&&this.domPosition.prev===this.currentItem.prev().not(".ui-sortable-helper")[0]&&this.domPosition.parent===this.currentItem.parent()[0]||e||s.push(function(t){this._trigger("update",t,this._uiHash())}),this!==this.currentContainer&&(e||(s.push(function(t){this._trigger("remove",t,this._uiHash())}),s.push(function(t){return function(e){t._trigger("receive",e,this._uiHash(this))}}.call(this,this.currentContainer)),s.push(function(t){return function(e){t._trigger("update",e,this._uiHash(this))}}.call(this,this.currentContainer)))),i=this.containers.length-1;i>=0;i--)e||s.push(function(t){return function(e){t._trigger("deactivate",e,this._uiHash(this))}}.call(this,this.containers[i])),this.containers[i].containerCache.over&&(s.push(function(t){return function(e){t._trigger("out",e,this._uiHash(this))}}.call(this,this.containers[i])),this.containers[i].containerCache.over=0);if(this.storedCursor&&(this.document.find("body").css("cursor",this.storedCursor),this.storedStylesheet.remove()),this._storedOpacity&&this.helper.css("opacity",this._storedOpacity),this._storedZIndex&&this.helper.css("zIndex","auto"===this._storedZIndex?"":this._storedZIndex),this.dragging=!1,this.cancelHelperRemoval){if(!e){for(this._trigger("beforeStop",t,this._uiHash()),i=0;s.length>i;i++)s[i].call(this,t);this._trigger("stop",t,this._uiHash())}return this.fromOutside=!1,!1}if(e||this._trigger("beforeStop",t,this._uiHash()),this.placeholder[0].parentNode.removeChild(this.placeholder[0]),this.helper[0]!==this.currentItem[0]&&this.helper.remove(),this.helper=null,!e){for(i=0;s.length>i;i++)s[i].call(this,t);this._trigger("stop",t,this._uiHash())}return 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:data(ui-button)"},_create:function(){this.element.addClass("ui-buttonset")},_init:function(){this.refresh()},_setOption:function(t,e){"disabled"===t&&this.buttons.button("option",t,e),this._super(t,e)},refresh:function(){var e="rtl"===this.element.css("direction");this.buttons=this.element.find(this.options.items).filter(":ui-button").button("refresh").end().not(":ui-button").button().end().map(function(){return t(this).button("widget")[0]}).removeClass("ui-corner-all ui-corner-left ui-corner-right").filter(":first").addClass(e?"ui-corner-right":"ui-corner-left").end().filter(":last").addClass(e?"ui-corner-left":"ui-corner-right").end().end()},_destroy:function(){this.element.removeClass("ui-buttonset"),this.buttons.map(function(){return t(this).button("widget")[0]}).removeClass("ui-corner-left ui-corner-right").end().button("destroy")}})}(jQuery),function(t,e){function i(){this._curInst=null,this._keyEvent=!1,this._disabledInputs=[],this._datepickerShowing=!1,this._inDialog=!1,this._mainDivId="ui-datepicker-div",this._inlineClass="ui-datepicker-inline",this._appendClass="ui-datepicker-append",this._triggerClass="ui-datepicker-trigger",this._dialogClass="ui-datepicker-dialog",this._disableClass="ui-datepicker-disabled",this._unselectableClass="ui-datepicker-unselectable",this._currentClass="ui-datepicker-current-day",this._dayOverClass="ui-datepicker-days-cell-over",this.regional=[],this.regional[""]={closeText:"Done",prevText:"Prev",nextText:"Next",currentText:"Today",monthNames:["January","February","March","April","May","June","July","August","September","October","November","December"],monthNamesShort:["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],dayNames:["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"],dayNamesShort:["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],dayNamesMin:["Su","Mo","Tu","We","Th","Fr","Sa"],weekHeader:"Wk",dateFormat:"mm/dd/yy",firstDay:0,isRTL:!1,showMonthAfterYear:!1,yearSuffix:""},this._defaults={showOn:"focus",showAnim:"fadeIn",showOptions:{},defaultDate:null,appendText:"",buttonText:"...",buttonImage:"",buttonImageOnly:!1,hideIfNoPrevNext:!1,navigationAsDateFormat:!1,gotoCurrent:!1,changeMonth:!1,changeYear:!1,yearRange:"c-10:c+10",showOtherMonths:!1,selectOtherMonths:!1,showWeek:!1,calculateWeek:this.iso8601Week,shortYearCutoff:"+10",minDate:null,maxDate:null,duration:"fast",beforeShowDay:null,beforeShow:null,onSelect:null,onChangeMonthYear:null,onClose:null,numberOfMonths:1,showCurrentAtPos:0,stepMonths:1,stepBigMonths:12,altField:"",altFormat:"",constrainInput:!0,showButtonPanel:!1,autoSize:!1,disabled:!1},t.extend(this._defaults,this.regional[""]),this.dpDiv=s(t("<div id='"+this._mainDivId+"' class='ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all'></div>"))}function s(e){var i="button, .ui-datepicker-prev, .ui-datepicker-next, .ui-datepicker-calendar td a";return e.delegate(i,"mouseout",function(){t(this).removeClass("ui-state-hover"),-1!==this.className.indexOf("ui-datepicker-prev")&&t(this).removeClass("ui-datepicker-prev-hover"),-1!==this.className.indexOf("ui-datepicker-next")&&t(this).removeClass("ui-datepicker-next-hover")}).delegate(i,"mouseover",function(){t.datepicker._isDisabledDatepicker(o.inline?e.parent()[0]:o.input[0])||(t(this).parents(".ui-datepicker-calendar").find("a").removeClass("ui-state-hover"),t(this).addClass("ui-state-hover"),-1!==this.className.indexOf("ui-datepicker-prev")&&t(this).addClass("ui-datepicker-prev-hover"),-1!==this.className.indexOf("ui-datepicker-next")&&t(this).addClass("ui-datepicker-next-hover"))})}function n(e,i){t.extend(e,i);for(var s in i)null==i[s]&&(e[s]=i[s]);return e}t.extend(t.ui,{datepicker:{version:"1.10.2"}});var o,a="datepicker",r=(new Date).getTime();t.extend(i.prototype,{markerClassName:"hasDatepicker",maxRows:4,_widgetDatepicker:function(){return this.dpDiv},setDefaults:function(t){return n(this._defaults,t||{}),this},_attachDatepicker:function(e,i){var s,n,o;s=e.nodeName.toLowerCase(),n="div"===s||"span"===s,e.id||(this.uuid+=1,e.id="dp"+this.uuid),o=this._newInst(t(e),n),o.settings=t.extend({},i||{}),"input"===s?this._connectDatepicker(e,o):n&&this._inlineDatepicker(e,o)},_newInst:function(e,i){var n=e[0].id.replace(/([^A-Za-z0-9_\-])/g,"\\\\$1");return{id:n,input:e,selectedDay:0,selectedMonth:0,selectedYear:0,drawMonth:0,drawYear:0,inline:i,dpDiv:i?s(t("<div class='"+this._inlineClass+" ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all'></div>")):this.dpDiv}},_connectDatepicker:function(e,i){var s=t(e);i.append=t([]),i.trigger=t([]),s.hasClass(this.markerClassName)||(this._attachments(s,i),s.addClass(this.markerClassName).keydown(this._doKeyDown).keypress(this._doKeyPress).keyup(this._doKeyUp),this._autoSize(i),t.data(e,a,i),i.settings.disabled&&this._disableDatepicker(e))},_attachments:function(e,i){var s,n,o,a=this._get(i,"appendText"),r=this._get(i,"isRTL");i.append&&i.append.remove(),a&&(i.append=t("<span class='"+this._appendClass+"'>"+a+"</span>"),e[r?"before":"after"](i.append)),e.unbind("focus",this._showDatepicker),i.trigger&&i.trigger.remove(),s=this._get(i,"showOn"),("focus"===s||"both"===s)&&e.focus(this._showDatepicker),("button"===s||"both"===s)&&(n=this._get(i,"buttonText"),o=this._get(i,"buttonImage"),i.trigger=t(this._get(i,"buttonImageOnly")?t("<img/>").addClass(this._triggerClass).attr({src:o,alt:n,title:n}):t("<button type='button'></button>").addClass(this._triggerClass).html(o?t("<img/>").attr({src:o,alt:n,title:n}):n)),e[r?"before":"after"](i.trigger),i.trigger.click(function(){return t.datepicker._datepickerShowing&&t.datepicker._lastInput===e[0]?t.datepicker._hideDatepicker():t.datepicker._datepickerShowing&&t.datepicker._lastInput!==e[0]?(t.datepicker._hideDatepicker(),t.datepicker._showDatepicker(e[0])):t.datepicker._showDatepicker(e[0]),!1}))},_autoSize:function(t){if(this._get(t,"autoSize")&&!t.inline){var e,i,s,n,o=new Date(2009,11,20),a=this._get(t,"dateFormat");a.match(/[DM]/)&&(e=function(t){for(i=0,s=0,n=0;t.length>n;n++)t[n].length>i&&(i=t[n].length,s=n);return s},o.setMonth(e(this._get(t,a.match(/MM/)?"monthNames":"monthNamesShort"))),o.setDate(e(this._get(t,a.match(/DD/)?"dayNames":"dayNamesShort"))+20-o.getDay())),t.input.attr("size",this._formatDate(t,o).length)}},_inlineDatepicker:function(e,i){var s=t(e);s.hasClass(this.markerClassName)||(s.addClass(this.markerClassName).append(i.dpDiv),t.data(e,a,i),this._setDate(i,this._getDefaultDate(i),!0),this._updateDatepicker(i),this._updateAlternate(i),i.settings.disabled&&this._disableDatepicker(e),i.dpDiv.css("display","block"))},_dialogDatepicker:function(e,i,s,o,r){var h,l,c,u,d,p=this._dialogInst;return p||(this.uuid+=1,h="dp"+this.uuid,this._dialogInput=t("<input type='text' id='"+h+"' style='position: absolute; top: -100px; width: 0px;'/>"),this._dialogInput.keydown(this._doKeyDown),t("body").append(this._dialogInput),p=this._dialogInst=this._newInst(this._dialogInput,!1),p.settings={},t.data(this._dialogInput[0],a,p)),n(p.settings,o||{}),i=i&&i.constructor===Date?this._formatDate(p,i):i,this._dialogInput.val(i),this._pos=r?r.length?r:[r.pageX,r.pageY]:null,this._pos||(l=document.documentElement.clientWidth,c=document.documentElement.clientHeight,u=document.documentElement.scrollLeft||document.body.scrollLeft,d=document.documentElement.scrollTop||document.body.scrollTop,this._pos=[l/2-100+u,c/2-150+d]),this._dialogInput.css("left",this._pos[0]+20+"px").css("top",this._pos[1]+"px"),p.settings.onSelect=s,this._inDialog=!0,this.dpDiv.addClass(this._dialogClass),this._showDatepicker(this._dialogInput[0]),t.blockUI&&t.blockUI(this.dpDiv),t.data(this._dialogInput[0],a,p),this},_destroyDatepicker:function(e){var i,s=t(e),n=t.data(e,a);s.hasClass(this.markerClassName)&&(i=e.nodeName.toLowerCase(),t.removeData(e,a),"input"===i?(n.append.remove(),n.trigger.remove(),s.removeClass(this.markerClassName).unbind("focus",this._showDatepicker).unbind("keydown",this._doKeyDown).unbind("keypress",this._doKeyPress).unbind("keyup",this._doKeyUp)):("div"===i||"span"===i)&&s.removeClass(this.markerClassName).empty())},_enableDatepicker:function(e){var i,s,n=t(e),o=t.data(e,a);n.hasClass(this.markerClassName)&&(i=e.nodeName.toLowerCase(),"input"===i?(e.disabled=!1,o.trigger.filter("button").each(function(){this.disabled=!1}).end().filter("img").css({opacity:"1.0",cursor:""})):("div"===i||"span"===i)&&(s=n.children("."+this._inlineClass),s.children().removeClass("ui-state-disabled"),s.find("select.ui-datepicker-month, select.ui-datepicker-year").prop("disabled",!1)),this._disabledInputs=t.map(this._disabledInputs,function(t){return t===e?null:t}))},_disableDatepicker:function(e){var i,s,n=t(e),o=t.data(e,a);n.hasClass(this.markerClassName)&&(i=e.nodeName.toLowerCase(),"input"===i?(e.disabled=!0,o.trigger.filter("button").each(function(){this.disabled=!0}).end().filter("img").css({opacity:"0.5",cursor:"default"})):("div"===i||"span"===i)&&(s=n.children("."+this._inlineClass),s.children().addClass("ui-state-disabled"),s.find("select.ui-datepicker-month, select.ui-datepicker-year").prop("disabled",!0)),this._disabledInputs=t.map(this._disabledInputs,function(t){return t===e?null:t}),this._disabledInputs[this._disabledInputs.length]=e)},_isDisabledDatepicker:function(t){if(!t)return!1;for(var e=0;this._disabledInputs.length>e;e++)if(this._disabledInputs[e]===t)return!0;return!1},_getInst:function(e){try{return t.data(e,a)}catch(i){throw"Missing instance data for this datepicker"}},_optionDatepicker:function(i,s,o){var a,r,h,l,c=this._getInst(i);return 2===arguments.length&&"string"==typeof s?"defaults"===s?t.extend({},t.datepicker._defaults):c?"all"===s?t.extend({},c.settings):this._get(c,s):null:(a=s||{},"string"==typeof s&&(a={},a[s]=o),c&&(this._curInst===c&&this._hideDatepicker(),r=this._getDateDatepicker(i,!0),h=this._getMinMaxDate(c,"min"),l=this._getMinMaxDate(c,"max"),n(c.settings,a),null!==h&&a.dateFormat!==e&&a.minDate===e&&(c.settings.minDate=this._formatDate(c,h)),null!==l&&a.dateFormat!==e&&a.maxDate===e&&(c.settings.maxDate=this._formatDate(c,l)),"disabled"in a&&(a.disabled?this._disableDatepicker(i):this._enableDatepicker(i)),this._attachments(t(i),c),this._autoSize(c),this._setDate(c,r),this._updateAlternate(c),this._updateDatepicker(c)),e)},_changeDatepicker:function(t,e,i){this._optionDatepicker(t,e,i)},_refreshDatepicker:function(t){var e=this._getInst(t);e&&this._updateDatepicker(e)},_setDateDatepicker:function(t,e){var i=this._getInst(t);i&&(this._setDate(i,e),this._updateDatepicker(i),this._updateAlternate(i))},_getDateDatepicker:function(t,e){var i=this._getInst(t);return i&&!i.inline&&this._setDateFromField(i,e),i?this._getDate(i):null},_doKeyDown:function(e){var i,s,n,o=t.datepicker._getInst(e.target),a=!0,r=o.dpDiv.is(".ui-datepicker-rtl");if(o._keyEvent=!0,t.datepicker._datepickerShowing)switch(e.keyCode){case 9:t.datepicker._hideDatepicker(),a=!1;break;case 13:return n=t("td."+t.datepicker._dayOverClass+":not(."+t.datepicker._currentClass+")",o.dpDiv),n[0]&&t.datepicker._selectDay(e.target,o.selectedMonth,o.selectedYear,n[0]),i=t.datepicker._get(o,"onSelect"),i?(s=t.datepicker._formatDate(o),i.apply(o.input?o.input[0]:null,[s,o])):t.datepicker._hideDatepicker(),!1;case 27:t.datepicker._hideDatepicker();break;case 33:t.datepicker._adjustDate(e.target,e.ctrlKey?-t.datepicker._get(o,"stepBigMonths"):-t.datepicker._get(o,"stepMonths"),"M");break;case 34:t.datepicker._adjustDate(e.target,e.ctrlKey?+t.datepicker._get(o,"stepBigMonths"):+t.datepicker._get(o,"stepMonths"),"M");break;case 35:(e.ctrlKey||e.metaKey)&&t.datepicker._clearDate(e.target),a=e.ctrlKey||e.metaKey;break;case 36:(e.ctrlKey||e.metaKey)&&t.datepicker._gotoToday(e.target),a=e.ctrlKey||e.metaKey;break;case 37:(e.ctrlKey||e.metaKey)&&t.datepicker._adjustDate(e.target,r?1:-1,"D"),a=e.ctrlKey||e.metaKey,e.originalEvent.altKey&&t.datepicker._adjustDate(e.target,e.ctrlKey?-t.datepicker._get(o,"stepBigMonths"):-t.datepicker._get(o,"stepMonths"),"M");break;case 38:(e.ctrlKey||e.metaKey)&&t.datepicker._adjustDate(e.target,-7,"D"),a=e.ctrlKey||e.metaKey;break;case 39:(e.ctrlKey||e.metaKey)&&t.datepicker._adjustDate(e.target,r?-1:1,"D"),a=e.ctrlKey||e.metaKey,e.originalEvent.altKey&&t.datepicker._adjustDate(e.target,e.ctrlKey?+t.datepicker._get(o,"stepBigMonths"):+t.datepicker._get(o,"stepMonths"),"M");break;case 40:(e.ctrlKey||e.metaKey)&&t.datepicker._adjustDate(e.target,7,"D"),a=e.ctrlKey||e.metaKey;break;default:a=!1}else 36===e.keyCode&&e.ctrlKey?t.datepicker._showDatepicker(this):a=!1;a&&(e.preventDefault(),e.stopPropagation())},_doKeyPress:function(i){var s,n,o=t.datepicker._getInst(i.target);return t.datepicker._get(o,"constrainInput")?(s=t.datepicker._possibleChars(t.datepicker._get(o,"dateFormat")),n=String.fromCharCode(null==i.charCode?i.keyCode:i.charCode),i.ctrlKey||i.metaKey||" ">n||!s||s.indexOf(n)>-1):e},_doKeyUp:function(e){var i,s=t.datepicker._getInst(e.target);if(s.input.val()!==s.lastVal)try{i=t.datepicker.parseDate(t.datepicker._get(s,"dateFormat"),s.input?s.input.val():null,t.datepicker._getFormatConfig(s)),i&&(t.datepicker._setDateFromField(s),t.datepicker._updateAlternate(s),t.datepicker._updateDatepicker(s))}catch(n){}return!0},_showDatepicker:function(e){if(e=e.target||e,"input"!==e.nodeName.toLowerCase()&&(e=t("input",e.parentNode)[0]),!t.datepicker._isDisabledDatepicker(e)&&t.datepicker._lastInput!==e){var i,s,o,a,r,h,l;i=t.datepicker._getInst(e),t.datepicker._curInst&&t.datepicker._curInst!==i&&(t.datepicker._curInst.dpDiv.stop(!0,!0),i&&t.datepicker._datepickerShowing&&t.datepicker._hideDatepicker(t.datepicker._curInst.input[0])),s=t.datepicker._get(i,"beforeShow"),o=s?s.apply(e,[e,i]):{},o!==!1&&(n(i.settings,o),i.lastVal=null,t.datepicker._lastInput=e,t.datepicker._setDateFromField(i),t.datepicker._inDialog&&(e.value=""),t.datepicker._pos||(t.datepicker._pos=t.datepicker._findPos(e),t.datepicker._pos[1]+=e.offsetHeight),a=!1,t(e).parents().each(function(){return a|="fixed"===t(this).css("position"),!a}),r={left:t.datepicker._pos[0],top:t.datepicker._pos[1]},t.datepicker._pos=null,i.dpDiv.empty(),i.dpDiv.css({position:"absolute",display:"block",top:"-1000px"}),t.datepicker._updateDatepicker(i),r=t.datepicker._checkOffset(i,r,a),i.dpDiv.css({position:t.datepicker._inDialog&&t.blockUI?"static":a?"fixed":"absolute",display:"none",left:r.left+"px",top:r.top+"px"}),i.inline||(h=t.datepicker._get(i,"showAnim"),l=t.datepicker._get(i,"duration"),i.dpDiv.zIndex(t(e).zIndex()+1),t.datepicker._datepickerShowing=!0,t.effects&&t.effects.effect[h]?i.dpDiv.show(h,t.datepicker._get(i,"showOptions"),l):i.dpDiv[h||"show"](h?l:null),i.input.is(":visible")&&!i.input.is(":disabled")&&i.input.focus(),t.datepicker._curInst=i))}},_updateDatepicker:function(e){this.maxRows=4,o=e,e.dpDiv.empty().append(this._generateHTML(e)),this._attachHandlers(e),e.dpDiv.find("."+this._dayOverClass+" a").mouseover();var i,s=this._getNumberOfMonths(e),n=s[1],a=17;e.dpDiv.removeClass("ui-datepicker-multi-2 ui-datepicker-multi-3 ui-datepicker-multi-4").width(""),n>1&&e.dpDiv.addClass("ui-datepicker-multi-"+n).css("width",a*n+"em"),e.dpDiv[(1!==s[0]||1!==s[1]?"add":"remove")+"Class"]("ui-datepicker-multi"),e.dpDiv[(this._get(e,"isRTL")?"add":"remove")+"Class"]("ui-datepicker-rtl"),e===t.datepicker._curInst&&t.datepicker._datepickerShowing&&e.input&&e.input.is(":visible")&&!e.input.is(":disabled")&&e.input[0]!==document.activeElement&&e.input.focus(),e.yearshtml&&(i=e.yearshtml,setTimeout(function(){i===e.yearshtml&&e.yearshtml&&e.dpDiv.find("select.ui-datepicker-year:first").replaceWith(e.yearshtml),i=e.yearshtml=null},0))},_getBorders:function(t){var e=function(t){return{thin:1,medium:2,thick:3}[t]||t};return[parseFloat(e(t.css("border-left-width"))),parseFloat(e(t.css("border-top-width")))]},_checkOffset:function(e,i,s){var n=e.dpDiv.outerWidth(),o=e.dpDiv.outerHeight(),a=e.input?e.input.outerWidth():0,r=e.input?e.input.outerHeight():0,h=document.documentElement.clientWidth+(s?0:t(document).scrollLeft()),l=document.documentElement.clientHeight+(s?0:t(document).scrollTop());return i.left-=this._get(e,"isRTL")?n-a:0,i.left-=s&&i.left===e.input.offset().left?t(document).scrollLeft():0,i.top-=s&&i.top===e.input.offset().top+r?t(document).scrollTop():0,i.left-=Math.min(i.left,i.left+n>h&&h>n?Math.abs(i.left+n-h):0),i.top-=Math.min(i.top,i.top+o>l&&l>o?Math.abs(o+r):0),i},_findPos:function(e){for(var i,s=this._getInst(e),n=this._get(s,"isRTL");e&&("hidden"===e.type||1!==e.nodeType||t.expr.filters.hidden(e));)e=e[n?"previousSibling":"nextSibling"];return i=t(e).offset(),[i.left,i.top]},_hideDatepicker:function(e){var i,s,n,o,r=this._curInst;!r||e&&r!==t.data(e,a)||this._datepickerShowing&&(i=this._get(r,"showAnim"),s=this._get(r,"duration"),n=function(){t.datepicker._tidyDialog(r)},t.effects&&(t.effects.effect[i]||t.effects[i])?r.dpDiv.hide(i,t.datepicker._get(r,"showOptions"),s,n):r.dpDiv["slideDown"===i?"slideUp":"fadeIn"===i?"fadeOut":"hide"](i?s:null,n),i||n(),this._datepickerShowing=!1,o=this._get(r,"onClose"),o&&o.apply(r.input?r.input[0]:null,[r.input?r.input.val():"",r]),this._lastInput=null,this._inDialog&&(this._dialogInput.css({position:"absolute",left:"0",top:"-100px"}),t.blockUI&&(t.unblockUI(),t("body").append(this.dpDiv))),this._inDialog=!1)},_tidyDialog:function(t){t.dpDiv.removeClass(this._dialogClass).unbind(".ui-datepicker-calendar")},_checkExternalClick:function(e){if(t.datepicker._curInst){var i=t(e.target),s=t.datepicker._getInst(i[0]);(i[0].id!==t.datepicker._mainDivId&&0===i.parents("#"+t.datepicker._mainDivId).length&&!i.hasClass(t.datepicker.markerClassName)&&!i.closest("."+t.datepicker._triggerClass).length&&t.datepicker._datepickerShowing&&(!t.datepicker._inDialog||!t.blockUI)||i.hasClass(t.datepicker.markerClassName)&&t.datepicker._curInst!==s)&&t.datepicker._hideDatepicker()}},_adjustDate:function(e,i,s){var n=t(e),o=this._getInst(n[0]);this._isDisabledDatepicker(n[0])||(this._adjustInstDate(o,i+("M"===s?this._get(o,"showCurrentAtPos"):0),s),this._updateDatepicker(o))},_gotoToday:function(e){var i,s=t(e),n=this._getInst(s[0]);this._get(n,"gotoCurrent")&&n.currentDay?(n.selectedDay=n.currentDay,n.drawMonth=n.selectedMonth=n.currentMonth,n.drawYear=n.selectedYear=n.currentYear):(i=new Date,n.selectedDay=i.getDate(),n.drawMonth=n.selectedMonth=i.getMonth(),n.drawYear=n.selectedYear=i.getFullYear()),this._notifyChange(n),this._adjustDate(s)},_selectMonthYear:function(e,i,s){var n=t(e),o=this._getInst(n[0]);o["selected"+("M"===s?"Month":"Year")]=o["draw"+("M"===s?"Month":"Year")]=parseInt(i.options[i.selectedIndex].value,10),this._notifyChange(o),this._adjustDate(n)},_selectDay:function(e,i,s,n){var o,a=t(e);t(n).hasClass(this._unselectableClass)||this._isDisabledDatepicker(a[0])||(o=this._getInst(a[0]),o.selectedDay=o.currentDay=t("a",n).html(),o.selectedMonth=o.currentMonth=i,o.selectedYear=o.currentYear=s,this._selectDate(e,this._formatDate(o,o.currentDay,o.currentMonth,o.currentYear)))},_clearDate:function(e){var i=t(e);this._selectDate(i,"")},_selectDate:function(e,i){var s,n=t(e),o=this._getInst(n[0]);i=null!=i?i:this._formatDate(o),o.input&&o.input.val(i),this._updateAlternate(o),s=this._get(o,"onSelect"),s?s.apply(o.input?o.input[0]:null,[i,o]):o.input&&o.input.trigger("change"),o.inline?this._updateDatepicker(o):(this._hideDatepicker(),this._lastInput=o.input[0],"object"!=typeof o.input[0]&&o.input.focus(),this._lastInput=null)},_updateAlternate:function(e){var i,s,n,o=this._get(e,"altField");o&&(i=this._get(e,"altFormat")||this._get(e,"dateFormat"),s=this._getDate(e),n=this.formatDate(i,s,this._getFormatConfig(e)),t(o).each(function(){t(this).val(n)}))},noWeekends:function(t){var e=t.getDay();return[e>0&&6>e,""]},iso8601Week:function(t){var e,i=new Date(t.getTime());return i.setDate(i.getDate()+4-(i.getDay()||7)),e=i.getTime(),i.setMonth(0),i.setDate(1),Math.floor(Math.round((e-i)/864e5)/7)+1},parseDate:function(i,s,n){if(null==i||null==s)throw"Invalid arguments";if(s="object"==typeof s?""+s:s+"",""===s)return null;var o,a,r,h,l=0,c=(n?n.shortYearCutoff:null)||this._defaults.shortYearCutoff,u="string"!=typeof c?c:(new Date).getFullYear()%100+parseInt(c,10),d=(n?n.dayNamesShort:null)||this._defaults.dayNamesShort,p=(n?n.dayNames:null)||this._defaults.dayNames,f=(n?n.monthNamesShort:null)||this._defaults.monthNamesShort,g=(n?n.monthNames:null)||this._defaults.monthNames,m=-1,v=-1,_=-1,b=-1,y=!1,w=function(t){var e=i.length>o+1&&i.charAt(o+1)===t;return e&&o++,e},k=function(t){var e=w(t),i="@"===t?14:"!"===t?20:"y"===t&&e?4:"o"===t?3:2,n=RegExp("^\\d{1,"+i+"}"),o=s.substring(l).match(n);if(!o)throw"Missing number at position "+l;return l+=o[0].length,parseInt(o[0],10)},x=function(i,n,o){var a=-1,r=t.map(w(i)?o:n,function(t,e){return[[e,t]]}).sort(function(t,e){return-(t[1].length-e[1].length)});if(t.each(r,function(t,i){var n=i[1];return s.substr(l,n.length).toLowerCase()===n.toLowerCase()?(a=i[0],l+=n.length,!1):e}),-1!==a)return a+1;throw"Unknown name at position 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i=this._get(t,"dateFormat"),s=t.lastVal=t.input?t.input.val():null,n=this._getDefaultDate(t),o=n,a=this._getFormatConfig(t);try{o=this.parseDate(i,s,a)||n}catch(r){s=e?"":s}t.selectedDay=o.getDate(),t.drawMonth=t.selectedMonth=o.getMonth(),t.drawYear=t.selectedYear=o.getFullYear(),t.currentDay=s?o.getDate():0,t.currentMonth=s?o.getMonth():0,t.currentYear=s?o.getFullYear():0,this._adjustInstDate(t)}},_getDefaultDate:function(t){return this._restrictMinMax(t,this._determineDate(t,this._get(t,"defaultDate"),new Date))},_determineDate:function(e,i,s){var n=function(t){var e=new Date;return e.setDate(e.getDate()+t),e},o=function(i){try{return t.datepicker.parseDate(t.datepicker._get(e,"dateFormat"),i,t.datepicker._getFormatConfig(e))}catch(s){}for(var n=(i.toLowerCase().match(/^c/)?t.datepicker._getDate(e):null)||new 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window["DP_jQuery_"+r].datepicker._selectDay(s,+this.getAttribute("data-month"),+this.getAttribute("data-year"),this),!1},selectMonth:function(){return window["DP_jQuery_"+r].datepicker._selectMonthYear(s,this,"M"),!1},selectYear:function(){return window["DP_jQuery_"+r].datepicker._selectMonthYear(s,this,"Y"),!1}};t(this).bind(this.getAttribute("data-event"),e[this.getAttribute("data-handler")])})},_generateHTML:function(t){var e,i,s,n,o,a,r,h,l,c,u,d,p,f,g,m,v,_,b,y,w,k,x,D,C,I,P,T,M,S,z,A,H,N,E,W,O,F,R,j=new Date,L=this._daylightSavingAdjust(new Date(j.getFullYear(),j.getMonth(),j.getDate())),Y=this._get(t,"isRTL"),B=this._get(t,"showButtonPanel"),V=this._get(t,"hideIfNoPrevNext"),K=this._get(t,"navigationAsDateFormat"),U=this._getNumberOfMonths(t),q=this._get(t,"showCurrentAtPos"),Q=this._get(t,"stepMonths"),X=1!==U[0]||1!==U[1],$=this._daylightSavingAdjust(t.currentDay?new Date(t.currentYear,t.currentMonth,t.currentDay):new 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class='ui-datepicker-next ui-corner-all' data-handler='next' data-event='click' title='"+n+"'><span class='ui-icon ui-icon-circle-triangle-"+(Y?"w":"e")+"'>"+n+"</span></a>":V?"":"<a class='ui-datepicker-next ui-corner-all ui-state-disabled' title='"+n+"'><span class='ui-icon ui-icon-circle-triangle-"+(Y?"w":"e")+"'>"+n+"</span></a>",a=this._get(t,"currentText"),r=this._get(t,"gotoCurrent")&&t.currentDay?$:L,a=K?this.formatDate(a,r,this._getFormatConfig(t)):a,h=t.inline?"":"<button type='button' class='ui-datepicker-close ui-state-default ui-priority-primary ui-corner-all' data-handler='hide' data-event='click'>"+this._get(t,"closeText")+"</button>",l=B?"<div class='ui-datepicker-buttonpane ui-widget-content'>"+(Y?h:"")+(this._isInRange(t,r)?"<button type='button' class='ui-datepicker-current ui-state-default ui-priority-secondary ui-corner-all' data-handler='today' 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class='ui-datepicker-title'>",y="";if(o||!m)y+="<span class='ui-datepicker-month'>"+a[e]+"</span>";else{for(h=s&&s.getFullYear()===i,l=n&&n.getFullYear()===i,y+="<select class='ui-datepicker-month' data-handler='selectMonth' data-event='change'>",c=0;12>c;c++)(!h||c>=s.getMonth())&&(!l||n.getMonth()>=c)&&(y+="<option value='"+c+"'"+(c===e?" selected='selected'":"")+">"+r[c]+"</option>");y+="</select>"}if(_||(b+=y+(!o&&m&&v?"":"&#xa0;")),!t.yearshtml)if(t.yearshtml="",o||!v)b+="<span class='ui-datepicker-year'>"+i+"</span>";else{for(u=this._get(t,"yearRange").split(":"),d=(new Date).getFullYear(),p=function(t){var e=t.match(/c[+\-].*/)?i+parseInt(t.substring(1),10):t.match(/[+\-].*/)?d+parseInt(t,10):parseInt(t,10);return isNaN(e)?d:e},f=p(u[0]),g=Math.max(f,p(u[1]||"")),f=s?Math.max(f,s.getFullYear()):f,g=n?Math.min(g,n.getFullYear()):g,t.yearshtml+="<select class='ui-datepicker-year' data-handler='selectYear' data-event='change'>";g>=f;f++)t.yearshtml+="<option value='"+f+"'"+(f===i?" 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e,i,s,n,o,a=this.options.range,r=this.options,h=this,l=this._animateOff?!1:r.animate,c={};this.options.values&&this.options.values.length?this.handles.each(function(s){i=100*((h.values(s)-h._valueMin())/(h._valueMax()-h._valueMin())),c["horizontal"===h.orientation?"left":"bottom"]=i+"%",t(this).stop(1,1)[l?"animate":"css"](c,r.animate),h.options.range===!0&&("horizontal"===h.orientation?(0===s&&h.range.stop(1,1)[l?"animate":"css"]({left:i+"%"},r.animate),1===s&&h.range[l?"animate":"css"]({width:i-e+"%"},{queue:!1,duration:r.animate})):(0===s&&h.range.stop(1,1)[l?"animate":"css"]({bottom:i+"%"},r.animate),1===s&&h.range[l?"animate":"css"]({height:i-e+"%"},{queue:!1,duration:r.animate}))),e=i}):(s=this.value(),n=this._valueMin(),o=this._valueMax(),i=o!==n?100*((s-n)/(o-n)):0,c["horizontal"===this.orientation?"left":"bottom"]=i+"%",this.handle.stop(1,1)[l?"animate":"css"](c,r.animate),"min"===a&&"horizontal"===this.orientation&&this.range.stop(1,1)[l?"animate":"css"]({width:i+"%"},r.animate),"max"===a&&"horizontal"===this.orientation&&this.range[l?"animate":"css"]({width:100-i+"%"},{queue:!1,duration:r.animate}),"min"===a&&"vertical"===this.orientation&&this.range.stop(1,1)[l?"animate":"css"]({height:i+"%"},r.animate),"max"===a&&"vertical"===this.orientation&&this.range[l?"animate":"css"]({height:100-i+"%"},{queue:!1,duration:r.animate}))},_handleEvents:{keydown:function(i){var s,n,o,a,r=t(i.target).data("ui-slider-handle-index");switch(i.keyCode){case t.ui.keyCode.HOME:case t.ui.keyCode.END:case t.ui.keyCode.PAGE_UP:case t.ui.keyCode.PAGE_DOWN:case t.ui.keyCode.UP:case t.ui.keyCode.RIGHT:case t.ui.keyCode.DOWN:case t.ui.keyCode.LEFT:if(i.preventDefault(),!this._keySliding&&(this._keySliding=!0,t(i.target).addClass("ui-state-active"),s=this._start(i,r),s===!1))return}switch(a=this.options.step,n=o=this.options.values&&this.options.values.length?this.values(r):this.value(),i.keyCode){case t.ui.keyCode.HOME:o=this._valueMin();break;case t.ui.keyCode.END:o=this._valueMax();break;case t.ui.keyCode.PAGE_UP:o=this._trimAlignValue(n+(this._valueMax()-this._valueMin())/e);break;case t.ui.keyCode.PAGE_DOWN:o=this._trimAlignValue(n-(this._valueMax()-this._valueMin())/e);break;case t.ui.keyCode.UP:case t.ui.keyCode.RIGHT:if(n===this._valueMax())return;o=this._trimAlignValue(n+a);break;case t.ui.keyCode.DOWN:case t.ui.keyCode.LEFT:if(n===this._valueMin())return;o=this._trimAlignValue(n-a)}this._slide(i,r,o)},click:function(t){t.preventDefault()},keyup:function(e){var i=t(e.target).data("ui-slider-handle-index");this._keySliding&&(this._keySliding=!1,this._stop(e,i),this._change(e,i),t(e.target).removeClass("ui-state-active"))}}})}(jQuery),function(t){function e(t){return function(){var 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+!function(a,b){"use strict";function c(c,g){var h=this;h.$el=a(c),h.el=c,h.id=e++,h.$window=a(b),h.$document=a(document),h.$el.bind("destroyed",a.proxy(h.teardown,h)),h.$clonedHeader=null,h.$originalHeader=null,h.isSticky=!1,h.hasBeenSticky=!1,h.leftOffset=null,h.topOffset=null,h.init=function(){h.$el.each(function(){var b=a(this);b.css("padding",0),h.$originalHeader=a("thead:first",this),h.$clonedHeader=h.$originalHeader.clone(),b.trigger("clonedHeader."+d,[h.$clonedHeader]),h.$clonedHeader.addClass("tableFloatingHeader"),h.$clonedHeader.css("display","none"),h.$originalHeader.addClass("tableFloatingHeaderOriginal"),h.$originalHeader.after(h.$clonedHeader),h.$printStyle=a('<style type="text/css" media="print">.tableFloatingHeader{display:none !important;}.tableFloatingHeaderOriginal{position:static !important;}</style>'),a("head").append(h.$printStyle)}),h.setOptions(g),h.updateWidth(),h.toggleHeaders(),h.bind()},h.destroy=function(){h.$el.unbind("destroyed",h.teardown),h.teardown()},h.teardown=function(){h.isSticky&&h.$originalHeader.css("position","static"),a.removeData(h.el,"plugin_"+d),h.unbind(),h.$clonedHeader.remove(),h.$originalHeader.removeClass("tableFloatingHeaderOriginal"),h.$originalHeader.css("visibility","visible"),h.$printStyle.remove(),h.el=null,h.$el=null},h.bind=function(){h.$scrollableArea.on("scroll."+d,h.toggleHeaders),h.isWindowScrolling||(h.$window.on("scroll."+d+h.id,h.setPositionValues),h.$window.on("resize."+d+h.id,h.toggleHeaders)),h.$scrollableArea.on("resize."+d,h.toggleHeaders),h.$scrollableArea.on("resize."+d,h.updateWidth)},h.unbind=function(){h.$scrollableArea.off("."+d,h.toggleHeaders),h.isWindowScrolling||(h.$window.off("."+d+h.id,h.setPositionValues),h.$window.off("."+d+h.id,h.toggleHeaders)),h.$scrollableArea.off("."+d,h.updateWidth)},h.toggleHeaders=function(){h.$el&&h.$el.each(function(){var b,c=a(this),d=h.isWindowScrolling?isNaN(h.options.fixedOffset)?h.options.fixedOffset.outerHeight():h.options.fixedOffset:h.$scrollableArea.offset().top+(isNaN(h.options.fixedOffset)?0:h.options.fixedOffset),e=c.offset(),f=h.$scrollableArea.scrollTop()+d,g=h.$scrollableArea.scrollLeft(),i=h.isWindowScrolling?f>e.top:d>e.top,j=(h.isWindowScrolling?f:0)<e.top+c.height()-h.$clonedHeader.height()-(h.isWindowScrolling?0:d);i&&j?(b=e.left-g+h.options.leftOffset,h.$originalHeader.css({position:"fixed","margin-top":h.options.marginTop,left:b,"z-index":3}),h.leftOffset=b,h.topOffset=d,h.$clonedHeader.css("display",""),h.isSticky||(h.isSticky=!0,h.updateWidth()),h.setPositionValues()):h.isSticky&&(h.$originalHeader.css("position","static"),h.$clonedHeader.css("display","none"),h.isSticky=!1,h.resetWidth(a("td,th",h.$clonedHeader),a("td,th",h.$originalHeader)))})},h.setPositionValues=function(){var a=h.$window.scrollTop(),b=h.$window.scrollLeft();!h.isSticky||0>a||a+h.$window.height()>h.$document.height()||0>b||b+h.$window.width()>h.$document.width()||h.$originalHeader.css({top:h.topOffset-(h.isWindowScrolling?0:a),left:h.leftOffset-(h.isWindowScrolling?0:b)})},h.updateWidth=function(){if(h.isSticky){h.$originalHeaderCells||(h.$originalHeaderCells=a("th,td",h.$originalHeader)),h.$clonedHeaderCells||(h.$clonedHeaderCells=a("th,td",h.$clonedHeader));var b=h.getWidth(h.$clonedHeaderCells);h.setWidth(b,h.$clonedHeaderCells,h.$originalHeaderCells),h.$originalHeader.css("width",h.$clonedHeader.width())}},h.getWidth=function(c){var d=[];return c.each(function(c){var e,f=a(this);if("border-box"===f.css("box-sizing"))e=f[0].getBoundingClientRect().width;else{var g=a("th",h.$originalHeader);if("collapse"===g.css("border-collapse"))if(b.getComputedStyle)e=parseFloat(b.getComputedStyle(this,null).width);else{var i=parseFloat(f.css("padding-left")),j=parseFloat(f.css("padding-right")),k=parseFloat(f.css("border-width"));e=f.outerWidth()-i-j-k}else e=f.width()}d[c]=e}),d},h.setWidth=function(a,b,c){b.each(function(b){var d=a[b];c.eq(b).css({"min-width":d,"max-width":d})})},h.resetWidth=function(b,c){b.each(function(b){var d=a(this);c.eq(b).css({"min-width":d.css("min-width"),"max-width":d.css("max-width")})})},h.setOptions=function(c){h.options=a.extend({},f,c),h.$scrollableArea=a(h.options.scrollableArea),h.isWindowScrolling=h.$scrollableArea[0]===b},h.updateOptions=function(a){h.setOptions(a),h.unbind(),h.bind(),h.updateWidth(),h.toggleHeaders()},h.init()}var d="stickyTableHeaders",e=0,f={fixedOffset:0,leftOffset:0,marginTop:0,scrollableArea:b};a.fn[d]=function(b){return this.each(function(){var e=a.data(this,"plugin_"+d);e?"string"==typeof b?e[b].apply(e):e.updateOptions(b):"destroy"!==b&&a.data(this,"plugin_"+d,new c(this,b))})}}(jQuery,window);
+</script>
+<script type="text/javascript">
+// darksun.js --- darksun JS file
+//
+// Copyright (C) 2011-2016 All Right Reserved, Fabrice Niessen
+//
+// This file is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// This file is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// Author: Fabrice Niessen <(concat "fniessen" at-sign "pirilampo.org")>
+// URL: https://github.com/fniessen/org-html-themes/
+// Version: 20140515.1841
+
+$(function() {
+$('p').
+html(function(index, old) {
+return old.replace('FIXME',
+'<span class="fixme">FIXME</span>');
+});
+$('p').
+html(function(index, old) {
+return old.replace('XXX',
+'<span class="fixme">XXX</span>');
+});
+});
+
+// Remove leading section number
+$(function() {
+$('.section-number-2').text("");
+for (var i = 3; i <= 5; i++) {
+$('.section-number-' + i).each(function() {
+$(this).text($(this).text().replace(/^[0-9]+\./g, ""));
+});
+}
+});
+
+$(function() {
+$('<div id="minitoc" class="dontprint"></div>').prependTo('body');
+});
+
+// generate contents of minitoc
+function generateMiniToc(divId) {
+$('#minitoc-content').empty().append('<h2>In this section</h2><ul></ul>');
+$('#' + divId).find('h3').each(function(i) {
+// [2018-09-03 Mon 03:48] Get text up to non-breaking space,
+// to omit the tags.  If there are no tags, there will be no
+// &nbsp;, so get all the text.  (This fixes a bug in the
+// original code.)
+let text = null;
+let pos = $(this).text().search(/ | ►/);
+if (pos > 0) {
+text = $(this).text().substring(0, pos);
+}
+else {
+text = $(this).text();
+}
+$("#minitoc-content>ul").append("<li><a href='#" + $(this).attr("id") + "'>"
++ text + "</a></li>");
+});
+// Ensure that the target is expanded (hideShow)
+$('#minitoc-content a[href^="#"]').click(function() {
+var href = $(this).attr('href');
+hsExpandAnchor(href);
+});
+}
+
+// display tabs
+function tabifySections() {
+
+// hide TOC (if present)
+$('#table-of-contents').hide();
+
+// grab the list of `h2' from the page
+var allSections = [];
+$('h2')
+.each(function() {
+// Remove TODO keywords and tags (contained in spans)
+var tabText = $(this).clone().find('span').remove().end()
+.text().trim();
+var tabId = $(this).parent().attr('id');
+if (tabText) {
+// - remove heading number (all leading digits)
+// - remove progress logging (between square brackets)
+// - remove leading and trailing spaces
+tabText = tabText.replace(/^\d+\s+/, '').replace(/\[[\d/%]+\]/, '').trim();
+
+allSections.push({
+text: tabText,
+id: tabId
+});
+}
+});
+
+// create the tab links
+var tabs = $('<ul id="tabs"></ul>');
+for (i = 0; i < allSections.length; i++) {
+var item = allSections[i];
+html = $('<li><a href="#' + item.id + '">' + item.text + '</a></li>');
+tabs.append(html);
+}
+
+// insert tabs menu after title (`h1'), or at the beginning of the content
+if($('.title').length !== 0) {
+$('.title').after(tabs);
+}
+else {
+$('#content').prepend(tabs);
+}
+}
+
+function selectTabAndScroll(href) {
+// At this point we assume that href is local (starts with #)
+// alert(href);
+
+// Find the tab to activate
+var targetTab = $(href).closest('.ui-tabs-panel');
+var targetTabId = targetTab.attr('id');
+var targetTabAriaLabel = targetTab.attr('aria-labelledby');
+
+var targetTabIndex = $("#content ul li")
+.index($('[aria-labelledby="' + targetTabAriaLabel + '"]'));
+
+// Activate target tab
+$('#content').tabs('option', 'active', targetTabIndex);
+
+// Rebuild minitoc
+generateMiniToc(targetTabId);
+
+// Set the location hash
+// document.location.hash = href;
+
+// Scroll to top if href was a tab
+if (href == '#' + targetTabId) {
+// alert(targetTabId);
+$.scrollTo(0);
+}
+// Scroll to href if href was not a tab
+else {
+$.scrollTo(href);
+}
+}
+
+$(document).ready(function() {
+$('#preamble').remove();
+$('#table-of-contents').remove();
+
+// Initialize hideShow
+hsInit();
+
+// Prepare for tabs
+tabifySections();
+
+// Build the tabs from the #content div
+$('#content').tabs();
+
+// Set default animation
+$('#content').tabs('option', 'show', true);
+
+// Rebuild minitoc when a tab is activated
+$('#content').tabs({
+activate: function(event, ui) {
+var divId = ui.newTab.attr('aria-controls');
+generateMiniToc(divId);
+}
+});
+
+// Required to get the link of the tab in URL
+$('#content ul').localScroll({
+target: '#content',
+duration: 0,
+hash: true
+});
+
+// Handle hash in URL
+if ($('#content') && document.location.hash) {
+hsExpandAnchor(document.location.hash);
+selectTabAndScroll(document.location.hash);
+}
+// If no hash, build the minitoc anyway for selected tab
+else {
+var divId = $('#content div[aria-expanded=true]').attr('id');
+generateMiniToc(divId);
+}
+
+// Handle click on internal links
+$('.ui-tabs-panel a[href^="#"]').click(function(e) {
+var href = $(this).attr('href');
+hsExpandAnchor(href);
+selectTabAndScroll(href);
+e.preventDefault();
+});
+
+// add sticky headers to tables
+$('table').stickyTableHeaders();
+});
+
+function copyToClipboard(text)
+{
+if (window.clipboardData && window.clipboardData.setData) { // Internet Explorer
+window.clipboardData.setData("Text", text);
+}
+else { // Fallback solution
+window.prompt("Copy to clipboard: Ctrl+C, Enter", text);
+}
+}
+
+$(document).ready(function() {
+// Assuming that the ZeroClipboard swf file is in the same folder than darksun,
+// get the path to it (it will be relative to the current page location).
+var bbScriptPath = $('script[src$="darksun.js"]').attr('src');  // the js file path
+var bbPathToZeroClipboardSwf = bbScriptPath.replace('darksun.js', 'ZeroClipboard.swf');
+
+// Add copy to clipboard snippets
+$('.org-src-container').prepend('<div class="snippet-copy-to-clipboard"><span class="copy-to-clipboard-button">[copy]</span></div>');
+
+// Display/hide snippets on source block mouseenter/mouseleave
+$(document).on('mouseenter', '.org-src-container', function () {
+$(this).find('.snippet-copy-to-clipboard').show();
+
+// Need to call zclip here, once the button is visible.
+// Beacause when the button is not visible, zclip does nothing.
+if ((window.location.protocol != 'file:') && ($(this).find('.zclip').length == 0)) {
+$(this).find('.copy-to-clipboard-button').zclip({
+//path: 'http://www.steamdev.com/zclip/js/ZeroClipboard.swf',
+//path: 'styles/darksun/js/ZeroClipboard.swf',
+path: bbPathToZeroClipboardSwf,
+copy: function() {
+return $(this).parent().parent().find('.src').text();
+}
+});
+}
+}).on('mouseleave', '.org-src-container', function () {
+$(this).find('.snippet-copy-to-clipboard').hide();
+});
+
+// Handle copy to clipboard (here, for a local file only 'file://...'
+if (window.location.protocol == 'file:') { // if local file use browser-specific code
+$('.copy-to-clipboard-button').click(function() {
+// Get the text to be copied
+var text = $(this).parent().parent().find('.src').text();
+text = text.replace(/\n/g, "\r\n");
+// alert(text);
+copyToClipboard(text);
+});
+}
+});
+
+$(function() {
+$('li > code :contains("[X]")')
+.parent()
+.addClass('checked')
+.end()
+.remove();
+$('li > code :contains("[-]")')
+.parent()
+.addClass('halfchecked')
+.end()
+.remove();
+$('li > code :contains("[ ]")')
+.parent()
+.addClass('unchecked')
+.end()
+.remove();
+});
+
+$(function() {
+$('i :contains("[#A]")')
+.replaceWith('<i><span style="color: #F67777;">[#A]</span></i>');
+$('i :contains("[#B]")')
+.replaceWith('<i><span style="color: #B6E864;">[#B]</span></i>');
+$('i :contains("[#C]")')
+.replaceWith('<i><span style="color: #C3DCFF;">[#C]</span></i>');
+});
+
+function togglePanel(e) {
+e.preventDefault();
+
+$("#left-panel-contents").toggleClass('active').toggle(200);
+$("#right-panel-contents").toggleClass('active').toggle(200);
+
+var slidePos =
+$("#left-panel-button").css("left") == "-23px"? '182px': '-23px';
+
+$("#left-panel-button").
+animate({"left": slidePos, "opacity": 0.9}, {duration: "200" });
+
+// if ($("#left-panel-contents").hasClass('active')) {
+//     hsHideTodoKeyword('done');
+// } else {
+//     hsShowTodoKeyword('done');
+// }
+
+// return false;
+}
+
+$(function() {
+$('<div id="left-panel-wrapper" class="dontprint"><div id="left-panel-contents" style="opacity: 0.9"></div><div id="left-panel-button" class="dontprint"><a href="#">Dashboard</a></div></div>')
+.appendTo('body');
+
+$('<div id="right-panel-wrapper" class="dontprint"><div id="right-panel-contents" style="opacity: 0.9"></div></div>')
+.appendTo('body');
+
+$('#left-panel-button').click(togglePanel);
+});
+
+$(function() {
+var ul = $('<ul id="listOfTodo"></ul>').appendTo('#left-panel-contents');
+var countOfTodo = {}, listOfTodo = [], totalOfTodo = 0;
+
+// assign the counts (avoid double-counting elements from the ToC)
+$('span.todo').not($('#table-of-contents span.todo')).each(function() {
+var $thisTodo = $(this).text().trim();
+
+if ($.inArray($thisTodo, listOfTodo) == -1) {
+countOfTodo[$thisTodo] = 1;
+listOfTodo.push($thisTodo);
+}
+else
+countOfTodo[$thisTodo] += 1;
+totalOfTodo += 1;
+});
+
+function scoreTodo(t) {
+switch (t) {
+case 'NEW': return 1;
+case 'TODO': return 2;
+case 'STRT': return 3;
+case 'WAIT': return 4;
+case 'DLGT': return 5;
+case 'SDAY': return 6;
+case 'DFRD': return 7;
+case 'DONE': return 8;
+case 'CANX': return 9;
+default: return 0;
+}
+}
+
+function compareTodo(a, b) {
+if (scoreTodo(a) < scoreTodo(b)) return -1;
+if (scoreTodo(a) > scoreTodo(b)) return 1;
+return 0;
+}
+
+listOfTodo.sort(compareTodo);
+
+// display
+for (i = 0; i < listOfTodo.length; i++) {
+var $thisTodo = listOfTodo[i];
+$(ul).append('<li><span class="todo ' + $thisTodo + '">'+ $thisTodo + '</span>'
++ ' <small>(' + countOfTodo[$thisTodo] + ')</small></li>');
+}
+
+$('#listOfTodo')
+.before('<b>Next Actions</b> <small>(' + totalOfTodo + ')</small>:<br>');
+});
+
+$(function() {
+var ul = $('<ul id="listOfDone"></ul>').appendTo('#left-panel-contents');
+var countOfDone = {}, listOfDone = [], totalOfDone = 0;
+
+// assign the counts (avoid double-counting elements from the ToC)
+$('span.done').not($('#table-of-contents span.done')).each(function() {
+var $thisDone = $(this).text().trim();
+
+if ($.inArray($thisDone, listOfDone) == -1) {
+countOfDone[$thisDone] = 1;
+listOfDone.push($thisDone);
+}
+else
+countOfDone[$thisDone] += 1;
+totalOfDone += 1;
+});
+
+// display
+for (i = 0; i < listOfDone.length; i++) {
+var $thisDone = listOfDone[i];
+$(ul).append('<li><span class="done ' + $thisDone + '">'+ $thisDone + '</span>'
++ ' <small>(' + countOfDone[$thisDone] + ')</small></li>');
+}
+
+$('#listOfDone')
+.before('<b>Done Actions</b> <small>(' + totalOfDone + '):</small><br>');
+});
+
+$(function() {
+var ul = $('<ul id="listOfTags"></ul>').appendTo('#right-panel-contents');
+var countOfTags = {}, listOfTags = [], totalOfTags = 0;
+
+// assign the counts (avoid double-counting elements from the ToC)
+$('span.tag').not($('#table-of-contents span.tag')).each(function() {
+var $thisTagGroup = $(this).text().trim().split(/\s/);
+// \s matches spaces, tabs, new lines, etc.
+
+for (tag in $thisTagGroup) {
+if ($.inArray($thisTagGroup[tag], listOfTags) == -1) {
+countOfTags[$thisTagGroup[tag]] = 1;
+listOfTags.push($thisTagGroup[tag]);
+}
+else
+countOfTags[$thisTagGroup[tag]] += 1;
+totalOfTags += 1;
+}
+});
+
+listOfTags.sort();
+
+// display
+for (i = 0; i < listOfTags.length; i++) {
+var $thisTag = listOfTags[i];
+// $(ul).append('<li><span class="tag ' + $thisTag + '">'+
+//                   $thisTag + '</span> <small>(' + countOfTags[$thisTag] + ')</small></li>');
+$(ul).append('<li><span class="tag"><span class="' + $thisTag + '">' + $thisTag
++ '</span></span>'
++ ' <small>(' + countOfTags[$thisTag] + ')</small></li>');
+}
+
+$('#listOfTags')
+.before('<b>Contexts</b> <small>(' + totalOfTags + '):</small><br>');
+});
+
+$(function() {
+$('.done').parent(':header').parent().find(':header').addClass('DONEheader');
+$('.done').parent(':header').parent().css({color: '#999999'});
+});
+
+$(function() {
+$('span.todo').click(function(e) {
+var orgKeyword = $(this).text().trim();
+$('.' + orgKeyword).toggleClass('selected');
+$('#content .' + orgKeyword).parent().parent()
+.toggleClass('match' + orgKeyword);
+$('#left-panel-wrapper .' + orgKeyword).parent()
+.toggleClass('match' + orgKeyword);
+e.preventDefault();
+})
+});
+
+$(function() {
+$('.tag span').click(function(e) {
+var orgTag = $(this).text().trim();
+$('.' + orgTag).toggleClass('selected');
+$('#content .' + orgTag).parent().parent().parent()
+.toggleClass('matchtag');
+$('#right-panel-wrapper .' + orgTag).parent().parent()
+.toggleClass('matchtag');
+e.preventDefault();
+})
+});
+
+function clickPreviousTab() {
+var active = $('#content').tabs('option', 'active');
+// Avoid going back to last tab
+if (active == 0) return;
+
+$('#content').tabs('option', 'active', active - 1);
+
+// Set the location href
+var href = $('#content div[aria-expanded=true]').attr('id');
+document.location.hash = href;
+$.scrollTo(0);
+}
+
+function clickNextTab() {
+var active = $('#content').tabs('option', 'active');
+$('#content').tabs('option', 'active', active + 1);
+
+// Set the location href
+var href = $('#content div[aria-expanded=true]').attr('id');
+document.location.hash = href;
+$.scrollTo(0);
+}
+
+function orgDefkey(e) {
+if (!e)
+var e = window.event;
+var keycode = (e.keyCode) ? e.keyCode : e.which;
+var actualkey = String.fromCharCode(keycode);
+switch (actualkey) {
+case "?": // help (dashboard)
+case "h":
+togglePanel(e);
+break;
+case "n": // next
+clickNextTab();
+break;
+case "p": // previous
+clickPreviousTab();
+break;
+// case "b": // scroll down - should be mapped to Shift-SPC
+//     $(window).scrollTop($(window).scrollTop()-$(window).height());
+//     break;
+case "<": // scroll to top
+$(window).scrollTop(0);
+break;
+case ">": // scroll to bottom
+$(window).scrollTop($(document).height());
+break;
+case "-": // collapse all
+hsCollapseAll();
+break;
+case "+": // expand all
+hsExpandAll();
+break;
+case "r": // go to next task
+hsReviewTaskNext();
+break;
+case "R": // go to previous task
+hsReviewTaskPrev();
+break;
+case "q": // quit reviewing
+hsReviewTaskQuit();
+break;
+case "g": // refresh the page (from the server, rather than the cache)
+location.reload(true);
+break;
+}
+}
+
+document.onkeypress = orgDefkey;
+</script>
+<script type="text/javascript">
+// hideshow.js --- HideShow JS file
+//
+// Copyright (C) 2014 All Right Reserved, Fabrice Niessen
+//
+// This file is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// This file is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// Author: Fabrice Niessen <(concat "fniessen" at-sign "pirilampo.org")>
+// URL: https://github.com/fniessen/hide-show/
+// Version: 20140912.1722
+
+// var HS_COLLAPSIBLE_HEADERS = $('h3, h4, h5'); // collapsible headers
+
+if (typeof HS_STARTUP_FOLDED === 'undefined') {
+var HS_STARTUP_FOLDED = false;      // Show just the overview, or show all.
+}
+
+if (typeof HS_SHOW_ALL_TEXT === 'undefined') {
+var HS_SHOW_ALL_TEXT = 'Expand';
+}
+if (typeof HS_HIDE_ALL_TEXT === 'undefined') {
+var HS_HIDE_ALL_TEXT = 'Collapse';
+}
+
+if (typeof HS_ALWAYS_DISPLAY_ICON === 'undefined') {
+var HS_ALWAYS_DISPLAY_ICON = false; // Display an icon for all states, or
+// just when closed.
+}
+
+if (typeof HS_ICON_CLOSED === 'undefined') {
+var HS_ICON_CLOSED = '&#x25BA;';    // black right-pointing pointer
+}
+if (typeof HS_ICON_OPEN === 'undefined') {
+var HS_ICON_OPEN = '&#x25BC;';      // black down-pointing triangle
+}
+if (typeof HS_ICON_EMPTY === 'undefined') {
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+}
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+}
+
+if (typeof HS_CLASS === 'undefined') {
+var HS_CLASS = 'hsCollapsible';
+}
+
+// Expand a header
+function hsExpand(header) {
+hsExpand2(header, true);
+}
+
+// Expand a header
+function hsExpand2(header, expandDoneHeader) {
+// Ignore non collapsible entries
+if (!header.parent().hasClass(HS_CLASS)) return;
+
+// Do not expand DONE node if not required
+if (hsIsDoneHeader(header) && !expandDoneHeader) return;
+
+header.children('span[class="ellipsis"]').remove();
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+}
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+header.nextAll().show();
+}
+
+// Expand a header and all its parents
+function hsExpandParents(header) {
+hsExpand(header);
+header.parents('.hsCollapsed').each(function() {
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+}
+
+// Collapse a header and all its parents
+function hsCollapseParents(header) {
+hsCollapse(header);
+header.parents('.hsExpanded').each(function() {
+hsCollapse($(this).children(':header'));
+});
+}
+
+// Collapse a header
+function hsCollapse(header) {
+// Ignore non collapsible entries
+if (!header.parent().hasClass(HS_CLASS)) return;
+
+header.children('span[class="ellipsis"]').remove();
+header.append('<span class="ellipsis"> ' + HS_ICON_CLOSED + '</span>');
+header.parent().removeClass('hsExpanded').addClass('hsCollapsed');
+// header.nextAll().hide('fast');
+header.nextAll().hide();
+}
+
+// Toggle a header
+function hsToggleCollapsing(header) {
+if (header.parent().hasClass('hsCollapsed'))
+hsExpand(header);
+else if (header.parent().hasClass('hsExpanded'))
+hsCollapse(header);
+}
+
+// Expand all headers
+function hsExpandAll() {
+$('#content .hsCollapsed').each(function() {
+hsExpand2($(this).children(':header'), HS_SHOW_ALL_OPEN_DONE_TREES);
+});
+}
+
+// Collapse all headers
+function hsCollapseAll() {
+$('#content .hsExpanded').each(function() {
+hsCollapse($(this).children(':header'));
+});
+}
+
+// Collapse all visible headers
+function hsCollapseAllVisible() {
+$('#content .hsExpanded:visible').each(function() {
+hsCollapse($(this).children(':header'));
+});
+}
+
+// Add click events to H3/H4/H5 headers which have contents.
+function hsInit() {
+for (var i = 3; i <= 5; i++) {
+$('#content .outline-' + i).each(function() {
+var header = $(this).children(':header');
+if (header.siblings().length > 0) {
+$(this).addClass(HS_CLASS);
+header.css({cursor: 'pointer'});
+header.click(function() {
+hsToggleCollapsing($(this)); });
+
+// Allow to override global Collapse/Expand default on an entry
+// basis (see property `:HTML_CONTAINER_CLASS:')
+if (header.parent().hasClass('hsCollapsed')) {
+hsCollapse(header);
+} else if (header.parent().hasClass('hsExpanded')) {
+hsExpand(header);
+} else {
+hsSetDefaultVisibility(header);
+}
+}
+else {
+if (HS_ALWAYS_DISPLAY_ICON == true) {
+header.append('<span class="ellipsis"> ' + HS_ICON_EMPTY
++ '</span>');
+}
+$(this).addClass('hsEmpty');
+}
+});
+}
+
+// Add div to hold minitoc content (so it can be cleared without deleting the buttons)
+$('#minitoc').append($('<div id="minitoc-content"></div>'));
+
+// Add buttons
+$('#minitoc').append($('<div class="buttons dontprint"></div>'));
+$('.buttons').append($('<span>' + HS_SHOW_ALL_TEXT + '</span>')
+.addClass('hsButton')
+.click(hsExpandAll));
+$('.buttons').append($('<span>' + HS_HIDE_ALL_TEXT + '</span>')
+.addClass('hsButton')
+.click(hsCollapseAll));
+}
+
+// Returns true if a header is a DONE header
+function hsIsDoneHeader(header) {
+return $('span.done', header).length;
+}
+
+// Sets the default visibility state to a header
+function hsSetDefaultVisibility(header) {
+if (HS_STARTUP_FOLDED) {
+hsCollapse(header);
+}
+else {
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+hsExpand(header);
+}
+else {
+hsCollapse(header);
+}
+}
+}
+
+// Expands an anchor, i.e. expand all parent headers
+function hsExpandAnchor(id) {
+// alert(id);
+if (id) {
+// alert($(id + '.hsNode').length);
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+hsExpand2($(this).children(':header'), true);
+});
+}
+}
+
+// Search for next task to review, starting from beginning of current tab.
+// If BACKWARD is true, search in the reverse direction.
+function hsReviewTaskNext(backward) {
+// If no tasks to review at all, do nothing.
+if ($('.outline-2 span.todo').length == 0) return;
+
+if ($('.hsReviewing').length == 0) { // reviewing is starting
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+$('.hsReviewPanel').addClass('hsReviewing');
+$('body').prepend('<div id="hsOverlay"></div>');
+hsAddReviewingPanels();
+
+hsCollapseAll();
+// Get first task to review on each tab and expand it
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+}
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+// Get all todos
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+}
+
+// Find current review item and review the next one
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+hsExpandParents($(todo).children(':header'));
+break;
+}
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+foundReview = true;
+if (index < todos.length - 1) {
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+hsCollapseParents($(todo).children(':header'));
+}
+}
+}
+
+// Update reviewing panel
+if (index < todos.length) {
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+if (backward) {
+reviewItem = todos.length - index;
+}
+
+$('.outline-2:visible .hsReviewingPanel .hsReviewItem').text(reviewItem);
+}
+}
+
+// Scroll to the current review item
+$('html, body').animate({
+scrollTop: $(".hsReview:visible").offset().top
+}, 200);
+}
+
+// go to previous task to review
+function hsReviewTaskPrev() {
+hsReviewTaskNext(true);
+}
+
+// stop reviewing tasks
+function hsReviewTaskQuit() {
+$('body').removeClass('hsReviewing');
+$('.hsReviewPanel').removeClass('hsReviewing');
+$('.hsReview').removeClass('hsReview');
+$('#hsOverlay').remove();
+$('.hsReviewingPanel').remove();
+}
+
+function hsHideTodoKeyword(kw) {
+$('span.' + kw).addClass('hsHidden').parent().parent().hide();
+}
+
+function hsShowTodoKeyword(kw) {
+$('span.' + kw).removeClass('hsHidden').parent().parent().show();
+// XXX Show if parent is not collapsed!
+}
+
+function hsAddReviewPanels() {
+$('.outline-2').each(function(e) {
+var nbItems = $(this).find('span.todo').length;
+if (nbItems > 0) {
+$(this).prepend('<div class="hsReviewPanel hsUnselectable" onclick="hsReviewTaskNext()">'
++ 'Press r or click here<br>'
++ 'to review ' + nbItems + ' tasks<br>'
++ '(out of ' +  nbReviewTotalTasks + ' tasks)</div>');
+}
+});
+}
+
+function hsAddReviewingPanels() {
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++ '(out of ' +  nbReviewTotalTasks + ' tasks)<br>'
++ 'Shortcuts: '
++ '<span class="hsReviewButton" onclick="hsReviewTaskNext()">r (next)</span> - '
++ '<span class="hsReviewButton" onclick="hsReviewTaskPrev()">R (previous)</span>'
++ '</div>');
+}
+else {
+$(this).prepend('<div class="hsReviewingPanel hsUnselectable">No task to review<br>'
++ '(out of ' +  nbReviewTotalTasks + ' tasks)<br>'
++ 'Shortcuts: '
++ '<span class="hsReviewButton" onclick="hsReviewTaskNext()">r (next)</span> - '
++ '<span class="hsReviewButton" onclick="hsReviewTaskPrev()">R (previous)</span>'
++ '</div>');
+}
+});
+}
+
+var nbReviewTotalTasks;
+
+$(document).ready(function() {
+nbReviewTotalTasks = $('.outline-2 span.todo').length;
+hsAddReviewPanels();
+});
+</script>
+<style type="text/css">
+               body {
+                 max-width: 35cm !important;
+               }
+               #content {
+                 max-width: 80em !important;
+                 width: 90%;
+               }
+               </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">3D Synthezier</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#org8abad43">1. Operating principle</a>
+<ul>
+<li><a href="#org8dd1c07">1.1. Rectangular city</a></li>
+<li><a href="#org5cf25b3">1.2. Hexagonal city</a></li>
+</ul>
+</li>
+<li><a href="#orgc7907d1">2. Scene description language</a>
+<ul>
+<li><a href="#org5148d75">2.1. here</a></li>
+<li><a href="#orgbec57b2">2.2. p</a></li>
+<li><a href="#orgfc6c719">2.3. f</a></li>
+<li><a href="#org52097d3">2.4. warn</a></li>
+<li><a href="#org5a8e41b">2.5. end</a></li>
+<li><a href="#orgde495ab">2.6. mtl</a></li>
+<li><a href="#org7cb3699">2.7. mtlrnd</a></li>
+<li><a href="#orgd335276">2.8. obj</a></li>
+<li><a href="#org9abf1f6">2.9. rnd</a></li>
+<li><a href="#org8d1f106">2.10. #</a></li>
+<li><a href="#org01937d0">2.11. out</a></li>
+<li><a href="#org26af06c">2.12. set</a></li>
+<li><a href="#org126d947">2.13. variables usage</a></li>
+<li><a href="#orgb154baa">2.14. cmp</a></li>
+<li><a href="#orgf6e6283">2.15. ?</a></li>
+<li><a href="#org36815a1">2.16. dum</a></li>
+</ul>
+</li>
+<li><a href="#org45443e3">3. Installation</a>
+<ul>
+<li><a href="#org7a64d30">3.1. System requirements</a></li>
+<li><a href="#org7344c27">3.2. Directory layout</a></li>
+</ul>
+</li>
+<li><a href="#org772bf80">4. Usage</a></li>
+</ul>
+</div>
+</div>
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+
+
+<div id="outline-container-org8abad43" class="outline-2">
+<h2 id="org8abad43"><span class="section-number-2">1.</span> Operating principle</h2>
+<div class="outline-text-2" id="text-1">
+<p>
+Parses scene definition language and creates 3D world based on
+it. Result will be in a <a href="https://en.wikipedia.org/wiki/Wavefront_.obj_file">wavefront obj file</a>, witch can be then
+visualized using external renderer.
+</p>
+
+<p>
+Basic concept of defining scene is:
+</p>
+<ul class="org-ul">
+<li>Simple and primitive objects are created on point and polygon level.</li>
+<li>More complex ones can be created my combinig already existing ones,
+while applying various transformations on them.</li>
+</ul>
+
+<p>
+Objects with all its subobjects can be rotated, mirrored or resized
+omong any axis. Generator has built in cache for data input and output
+to minimize file access.
+</p>
+
+<p>
+<b>Examples:</b>
+</p>
+
+<p>
+Download Blender files:
+</p>
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">file</th>
+<th scope="col" class="org-left">size</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left"><a href="rectangular city.blend">rectangular city.blend</a></td>
+<td class="org-left">3.6 MB</td>
+</tr>
+
+<tr>
+<td class="org-left"><a href="hexagonal city.blend">hexagonal city.blend</a></td>
+<td class="org-left">21 MB</td>
+</tr>
+</tbody>
+</table>
+
+<p>
+They were produced by importing generated <a href="https://en.wikipedia.org/wiki/Wavefront_.obj_file">wavefront obj files</a> into
+<a href="https://www.blender.org/">Blender</a>.
+</p>
+</div>
+
+<div id="outline-container-org8dd1c07" class="outline-3">
+<h3 id="org8dd1c07"><span class="section-number-3">1.1.</span> Rectangular city</h3>
+<div class="outline-text-3" id="text-1-1">
+
+<div id="orgcde8a63" class="figure">
+<p><img src="rectangular city, 1.jpeg" alt="rectangular city, 1.jpeg" class="responsive-img" />
+</p>
+</div>
+
+
+<div id="orgc7984ce" class="figure">
+<p><img src="rectangular city, 2.jpeg" alt="rectangular city, 2.jpeg" class="responsive-img" />
+</p>
+</div>
+
+
+<div id="org5957bcc" class="figure">
+<p><img src="rectangular city, 3.jpeg" alt="rectangular city, 3.jpeg" class="responsive-img" />
+</p>
+</div>
+</div>
+</div>
+<div id="outline-container-org5cf25b3" class="outline-3">
+<h3 id="org5cf25b3"><span class="section-number-3">1.2.</span> Hexagonal city</h3>
+<div class="outline-text-3" id="text-1-2">
+
+<div id="orgf72edb4" class="figure">
+<p><img src="hexagonal city, 1.jpeg" alt="hexagonal city, 1.jpeg" class="responsive-img" />
+</p>
+</div>
+
+
+<div id="orgeddbab1" class="figure">
+<p><img src="hexagonal city, 2.jpeg" alt="hexagonal city, 2.jpeg" class="responsive-img" />
+</p>
+</div>
+
+
+<div id="org8ae2b52" class="figure">
+<p><img src="hexagonal city, 3.jpeg" alt="hexagonal city, 3.jpeg" class="responsive-img" />
+</p>
+</div>
+</div>
+</div>
+</div>
+<div id="outline-container-orgc7907d1" class="outline-2">
+<h2 id="orgc7907d1"><span class="section-number-2">2.</span> Scene description language</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+See also examples.
+</p>
+</div>
+<div id="outline-container-org5148d75" class="outline-3">
+<h3 id="org5148d75"><span class="section-number-3">2.1.</span> here</h3>
+<div class="outline-text-3" id="text-2-1">
+<pre class="example">
+here
+</pre>
+
+<p>
+defines new segment
+</p>
+</div>
+</div>
+<div id="outline-container-orgbec57b2" class="outline-3">
+<h3 id="orgbec57b2"><span class="section-number-3">2.2.</span> p</h3>
+<div class="outline-text-3" id="text-2-2">
+<pre class="example">
+p  x y z
+</pre>
+
+<p>
+defines new point
+</p>
+</div>
+</div>
+<div id="outline-container-orgfc6c719" class="outline-3">
+<h3 id="orgfc6c719"><span class="section-number-3">2.3.</span> f</h3>
+<div class="outline-text-3" id="text-2-3">
+<pre class="example">
+f  p1 p2 p3 p4
+</pre>
+
+<p>
+defines new polygon,  p4  may be unused
+</p>
+</div>
+</div>
+<div id="outline-container-org52097d3" class="outline-3">
+<h3 id="org52097d3"><span class="section-number-3">2.4.</span> warn</h3>
+<div class="outline-text-3" id="text-2-4">
+<pre class="example">
+warn  &lt;message&gt;
+</pre>
+
+<p>
+displays warning message, and wait for key
+</p>
+</div>
+</div>
+<div id="outline-container-org5a8e41b" class="outline-3">
+<h3 id="org5a8e41b"><span class="section-number-3">2.5.</span> end</h3>
+<div class="outline-text-3" id="text-2-5">
+<pre class="example">
+end
+</pre>
+
+<p>
+terminates parser
+</p>
+</div>
+</div>
+<div id="outline-container-orgde495ab" class="outline-3">
+<h3 id="orgde495ab"><span class="section-number-3">2.6.</span> mtl</h3>
+<div class="outline-text-3" id="text-2-6">
+<pre class="example">
+mtl  material
+</pre>
+
+<p>
+selects material
+</p>
+</div>
+</div>
+<div id="outline-container-org7cb3699" class="outline-3">
+<h3 id="org7cb3699"><span class="section-number-3">2.7.</span> mtlrnd</h3>
+<div class="outline-text-3" id="text-2-7">
+<pre class="example">
+mtlrnd  material ...
+</pre>
+
+<p>
+selects random material from list
+</p>
+</div>
+</div>
+<div id="outline-container-orgd335276" class="outline-3">
+<h3 id="orgd335276"><span class="section-number-3">2.8.</span> obj</h3>
+<div class="outline-text-3" id="text-2-8">
+<pre class="example">
+obj  object xz45 xy20 x+3 y*2
+</pre>
+
+<p>
+includes sub object, can be rotated moved or resized, across X Y Z. If
+object name begin vith ~ then it will be loaded from current
+directory.  if object name ends with ~ then object will be parsed
+directly from file, and not chached, to allow loading of greater than
+500 lines files.
+</p>
+
+
+<div id="org2c85b00" class="figure">
+<p><img src="rotation.png" alt="rotation.png" />
+</p>
+</div>
+</div>
+</div>
+<div id="outline-container-org9abf1f6" class="outline-3">
+<h3 id="org9abf1f6"><span class="section-number-3">2.9.</span> rnd</h3>
+<div class="outline-text-3" id="text-2-9">
+<pre class="example">
+rnd  p^1^2^3 p^7^2^1
+</pre>
+
+<p>
+select random command to execute, ^ will be converted to spaces.
+</p>
+</div>
+</div>
+<div id="outline-container-org8d1f106" class="outline-3">
+<h3 id="org8d1f106"><span class="section-number-3">2.10.</span> #</h3>
+<div class="outline-text-3" id="text-2-10">
+<pre class="example">
+# whatever text
+</pre>
+
+<p>
+comment
+</p>
+</div>
+</div>
+<div id="outline-container-org01937d0" class="outline-3">
+<h3 id="org01937d0"><span class="section-number-3">2.11.</span> out</h3>
+<div class="outline-text-3" id="text-2-11">
+<pre class="example">
+out  file
+</pre>
+
+<p>
+specify output file name, must be first command
+</p>
+</div>
+</div>
+<div id="outline-container-org26af06c" class="outline-3">
+<h3 id="org26af06c"><span class="section-number-3">2.12.</span> set</h3>
+<div class="outline-text-3" id="text-2-12">
+<pre class="example">
+set  variable  contents
+</pre>
+
+<p>
+set variable contents, variable must be number, contents can be
+string. max variables is 100. first is 0.
+</p>
+</div>
+</div>
+<div id="outline-container-org126d947" class="outline-3">
+<h3 id="org126d947"><span class="section-number-3">2.13.</span> variables usage</h3>
+<div class="outline-text-3" id="text-2-13">
+<pre class="example">
+anycommand %1 anything
+</pre>
+
+<p>
+inserts variable 1 contents info line
+</p>
+</div>
+</div>
+<div id="outline-container-orgb154baa" class="outline-3">
+<h3 id="orgb154baa"><span class="section-number-3">2.14.</span> cmp</h3>
+<div class="outline-text-3" id="text-2-14">
+<pre class="example">
+cmp  flag string1 string2
+</pre>
+
+<p>
+compares strings, and inserts TRUE to flag, if they are equal, else inserts FALSE. max 9 falgs, 0 first. Each subobject has its own flags.
+</p>
+</div>
+</div>
+<div id="outline-container-orgf6e6283" class="outline-3">
+<h3 id="orgf6e6283"><span class="section-number-3">2.15.</span> ?</h3>
+<div class="outline-text-3" id="text-2-15">
+<pre class="example">
+?flag anycommand
+</pre>
+
+<p>
+executes command if flag is true.
+</p>
+
+<p>
+exapmle: ?3 obj car z*2 xy45
+</p>
+</div>
+</div>
+<div id="outline-container-org36815a1" class="outline-3">
+<h3 id="org36815a1"><span class="section-number-3">2.16.</span> dum</h3>
+<div class="outline-text-3" id="text-2-16">
+<pre class="example">
+dum
+</pre>
+
+<p>
+dummy function, does notheing
+</p>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org45443e3" class="outline-2">
+<h2 id="org45443e3"><span class="section-number-2">3.</span> Installation</h2>
+<div class="outline-text-2" id="text-3">
+<p>
+Edit <b>bin/3dparse.bas</b> file and update include path in there.
+</p>
+</div>
+
+<div id="outline-container-org7a64d30" class="outline-3">
+<h3 id="org7a64d30"><span class="section-number-3">3.1.</span> System requirements</h3>
+<div class="outline-text-3" id="text-3-1">
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-right" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">software</th>
+<th scope="col" class="org-right">tested version</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">DOS</td>
+<td class="org-right">6.22</td>
+</tr>
+
+<tr>
+<td class="org-left">QBasic</td>
+<td class="org-right">4.5</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-org7344c27" class="outline-3">
+<h3 id="org7344c27"><span class="section-number-3">3.2.</span> Directory layout</h3>
+<div class="outline-text-3" id="text-3-2">
+<dl class="org-dl">
+<dt>bin</dt><dd><dl class="org-dl">
+<dt>3dparse.bas</dt><dd>3D generator main executable</dd>
+<dt>city1.3d</dt><dd>city with square-like buildings</dd>
+<dt>city2.3d</dt><dd>city with hexangular buildings</dd>
+<dt>result.mtl</dt><dd>shared material library</dd>
+<dt>*.bat</dt><dd>quick launch scripts</dd>
+</dl></dd>
+
+<dt>include</dt><dd>3D objects used to compose the scene</dd>
+</dl>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org772bf80" class="outline-2">
+<h2 id="org772bf80"><span class="section-number-2">4.</span> Usage</h2>
+<div class="outline-text-2" id="text-4">
+<p>
+Make sure you have QB binaries in your PATH.  Execute
+</p>
+<pre class="example">
+bin/city1.bat
+</pre>
+
+<p>
+or
+</p>
+<pre class="example">
+bin/city2.bat
+</pre>
+
+<p>
+to generate example cities. After parsing is finished, appropriate
+*.obj files will appear in the bin directory holding generated scene.
+Visualize scene with your favourite renderer.
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2025-07-28 ma 03:33</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/3D GFX/3D Synthezier/doc/index.org b/3D GFX/3D Synthezier/doc/index.org
new file mode 100644
index 0000000..1ecf34f
--- /dev/null
+++ b/3D GFX/3D Synthezier/doc/index.org	
@@ -0,0 +1,172 @@
+#+SETUPFILE: ~/.emacs.d/org-styles/html/darksun.theme
+#+TITLE:  3D Synthezier
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+#+begin_export html
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+#+end_export
+
+
+* Operating principle
+
+Parses scene definition language and creates 3D world based on
+it. Result will be in a [[https://en.wikipedia.org/wiki/Wavefront_.obj_file][wavefront obj file]], witch can be then
+visualized using external renderer.
+
+Basic concept of defining scene is:
+- Simple and primitive objects are created on point and polygon level.
+- More complex ones can be created my combinig already existing ones,
+  while applying various transformations on them.
+
+Objects with all its subobjects can be rotated, mirrored or resized
+omong any axis. Generator has built in cache for data input and output
+to minimize file access.
+
+*Examples:*
+
+Download Blender files:
+| file                   | size   |
+|------------------------+--------|
+| [[file:rectangular city.blend][rectangular city.blend]] | 3.6 MB |
+| [[file:hexagonal city.blend][hexagonal city.blend]]   | 21 MB  |
+
+They were produced by importing generated [[https://en.wikipedia.org/wiki/Wavefront_.obj_file][wavefront obj files]] into
+[[https://www.blender.org/][Blender]].
+
+** Rectangular city
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:rectangular city, 1.jpeg]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:rectangular city, 2.jpeg]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:rectangular city, 3.jpeg]]
+** Hexagonal city
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:hexagonal city, 1.jpeg]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:hexagonal city, 2.jpeg]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:hexagonal city, 3.jpeg]]
+* Scene description language
+See also examples.
+** here
+ : here
+ defines new segment
+** p
+ : p  x y z
+ defines new point
+** f
+ : f  p1 p2 p3 p4
+ defines new polygon,  p4  may be unused
+** warn
+ : warn  <message>
+ displays warning message, and wait for key
+** end
+ : end
+ terminates parser
+** mtl
+ : mtl  material
+ selects material
+** mtlrnd
+ : mtlrnd  material ...
+ selects random material from list
+** obj
+ : obj  object xz45 xy20 x+3 y*2
+ includes sub object, can be rotated moved or resized, across X Y Z. If
+ object name begin vith ~ then it will be loaded from current
+ directory.  if object name ends with ~ then object will be parsed
+ directly from file, and not chached, to allow loading of greater than
+ 500 lines files.
+
+ [[file:rotation.png]]
+** rnd
+ : rnd  p^1^2^3 p^7^2^1
+ select random command to execute, ^ will be converted to spaces.
+** #
+ : # whatever text
+ comment
+** out
+ : out  file
+ specify output file name, must be first command
+** set
+ : set  variable  contents
+ set variable contents, variable must be number, contents can be
+ string. max variables is 100. first is 0.
+** variables usage
+ : anycommand %1 anything
+ inserts variable 1 contents info line
+** cmp
+ : cmp  flag string1 string2
+ compares strings, and inserts TRUE to flag, if they are equal, else inserts FALSE. max 9 falgs, 0 first. Each subobject has its own flags.
+** ?
+ : ?flag anycommand
+ executes command if flag is true.
+
+ exapmle: ?3 obj car z*2 xy45
+** dum
+ : dum
+ dummy function, does notheing
+
+* Installation
+Edit *bin/3dparse.bas* file and update include path in there.
+
+** System requirements
+
+| software | tested version |
+|----------+----------------|
+| DOS      |           6.22 |
+| QBasic   |            4.5 |
+
+** Directory layout
+
++ bin ::
+  + 3dparse.bas :: 3D generator main executable
+  + city1.3d :: city with square-like buildings
+  + city2.3d :: city with hexangular buildings
+  + result.mtl :: shared material library
+  + *.bat :: quick launch scripts
+
++ include :: 3D objects used to compose the scene
+
+* Usage
+
+Make sure you have QB binaries in your PATH.  Execute
+: bin/city1.bat
+or
+: bin/city2.bat
+to generate example cities. After parsing is finished, appropriate
+*.obj files will appear in the bin directory holding generated scene.
+Visualize scene with your favourite renderer.
diff --git a/3D GFX/3D Synthezier/doc/rectangular city, 1.jpeg b/3D GFX/3D Synthezier/doc/rectangular city, 1.jpeg
new file mode 100644
index 0000000..def4065
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/rectangular city, 1.jpeg differ
diff --git a/3D GFX/3D Synthezier/doc/rectangular city, 2.jpeg b/3D GFX/3D Synthezier/doc/rectangular city, 2.jpeg
new file mode 100644
index 0000000..0173e47
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/rectangular city, 2.jpeg differ
diff --git a/3D GFX/3D Synthezier/doc/rectangular city, 3.jpeg b/3D GFX/3D Synthezier/doc/rectangular city, 3.jpeg
new file mode 100644
index 0000000..20fc33c
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/rectangular city, 3.jpeg differ
diff --git a/3D GFX/3D Synthezier/doc/rectangular city.blend b/3D GFX/3D Synthezier/doc/rectangular city.blend
new file mode 100644
index 0000000..a532224
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/rectangular city.blend differ
diff --git a/3D GFX/3D Synthezier/doc/rotation.png b/3D GFX/3D Synthezier/doc/rotation.png
new file mode 100644
index 0000000..e6281ec
Binary files /dev/null and b/3D GFX/3D Synthezier/doc/rotation.png differ
diff --git a/3D GFX/3D Synthezier/include/6nrk0s.3d b/3D GFX/3D Synthezier/include/6nrk0s.3d
new file mode 100644
index 0000000..906ff9b
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/6nrk0s.3d	
@@ -0,0 +1,6 @@
+# suur 6 nurkse maja kompleks koos korteritega
+
+obj blk3
+set 1 kivi
+set 2 0
+obj nrk6 x*20 y*5 z*20 y+21
diff --git a/3D GFX/3D Synthezier/include/6nrk2s.3d b/3D GFX/3D Synthezier/include/6nrk2s.3d
new file mode 100644
index 0000000..8a40ce1
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/6nrk2s.3d	
@@ -0,0 +1,8 @@
+# suur 6 nurkse maja kompleks koos korterite ja 2. sillaga
+
+obj blk3
+set 1 kivi
+set 2 0
+obj nrk6 x*20 y*5 z*20 y+21
+obj bridgegl xz-90 y+22.5 x-1.5 z-17.3206
+obj bridgegl xz-30 y+22.5 x+14.25 z-9.9593
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/blk1.3d b/3D GFX/3D Synthezier/include/blk1.3d
new file mode 100644
index 0000000..661ff77
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/blk1.3d	
@@ -0,0 +1,15 @@
+# tavaline suur aken
+here
+p	0	0	0
+p	6	0	0
+p	6	-3	0
+p	0	-3	0
+
+p	0.5	-0.5	-0.01
+p	5.5	-0.5	-0.01
+p	5.5	-2	-0.01
+p	0.5	-2	-0.01
+mtl seintellis
+f 0 1 2 3
+mtlrnd klaashele klaastume
+f 4 5 6 7
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/blk2.3d b/3D GFX/3D Synthezier/include/blk2.3d
new file mode 100644
index 0000000..b2828bf
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/blk2.3d	
@@ -0,0 +1,33 @@
+# v2ike aken koosparkimisplatsiga
+
+# rnd obj^car^xz90^x+4.5^z-1.7^y-2.5 # #
+
+here
+p	0	0	0
+p	6	0	0
+p	6	-3	0
+p	0	-3	0
+
+p	0.5	-0.5	-0.01
+p	2	-0.5	-0.01
+p	2	-2	-0.01
+p	0.5	-2	-0.01
+
+p	2.5	-0.5	-0.01
+p	5.5	-0.5	-0.01
+p	5.5	-3	-0.01
+p	2.5	-3	-0.01
+
+p	0	-3	0
+p	6	-3	0
+p	6	-3	-3
+p	0	-3	-3
+
+mtl seintellis
+f 0 1 2 3
+mtlrnd klaashele klaastume
+f 4 5 6 7
+mtl pronks
+f 8 9 10 11
+mtl kivi
+f 12 13 14 15
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/blk3.3d b/3D GFX/3D Synthezier/include/blk3.3d
new file mode 100644
index 0000000..a62b82c
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/blk3.3d	
@@ -0,0 +1,34 @@
+# kuuenurkse maja korterite blokk
+
+obj krs2
+obj krs2 y+3
+obj krs2 y+6
+obj krs2 y+9
+
+obj krs2 y+12
+obj krs2 y+15
+obj krs2 y+18
+obj krs2 y+21
+
+here
+p	-12	-3	-20.7846
+p	12	-3	-20.7846
+p	24	-3	0	
+p	12	-3	20.7846
+p	-12	-3	20.7846
+p	-24	-3	0
+
+p       -12     21      -20.7846
+p       12      21      -20.7846
+p       24      21      0 
+p       12      21      20.7846
+p       -12     21      20.7846
+p       -24     21      0
+
+mtl seintellis
+f 0 1 2 3
+f 3 4 5 0
+f 6 7 8 9
+f 9 10 11 6
+
+
diff --git a/3D GFX/3D Synthezier/include/blk4.3d b/3D GFX/3D Synthezier/include/blk4.3d
new file mode 100644
index 0000000..924f68a
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/blk4.3d	
@@ -0,0 +1,8 @@
+# 1 kompleks 7st, 6 nurkselt sildadega uhendatud elamu moodulitest
+obj 6nrk0s
+obj 6nrk2s z+64.6412
+obj 6nrk2s xz-60 x+55.9809 z+32.3206
+obj 6nrk2s xz-120 x+55.9809 z-32.3206
+obj 6nrk2s xz-180 z-64.6412
+obj 6nrk2s xz-240 x-55.9809 z-32.3206
+obj 6nrk2s xz-300 x-55.9809 z+32.3206
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/bridge.3d b/3D GFX/3D Synthezier/include/bridge.3d
new file mode 100644
index 0000000..d6dc47f
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/bridge.3d	
@@ -0,0 +1,5 @@
+obj handrail
+obj handrail z+3
+set 1 kivi
+set 2 0
+obj nrk4 x*3.2 y*0.2 xz-90 z+1.5
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/bridge1.3d b/3D GFX/3D Synthezier/include/bridge1.3d
new file mode 100644
index 0000000..e8563ae
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/bridge1.3d	
@@ -0,0 +1,36 @@
+obj bridge
+obj bridge x+1
+obj bridge x+2
+obj bridge x+3
+obj bridge x+4
+
+obj bridge x+5
+obj bridge x+6
+obj bridge x+7
+obj bridge x+8
+obj bridge x+9
+
+obj bridge x+10
+obj bridge x+11
+obj bridge x+12
+obj bridge x+13
+obj bridge x+14
+
+obj bridge x+15
+obj bridge x+16
+obj bridge x+17
+obj bridge x+18
+obj bridge x+19
+
+obj bridge x+20
+obj bridge x+21
+obj bridge x+22
+obj bridge x+23
+obj bridge x+24
+
+obj bridge x+25
+obj bridge x+26
+obj bridge x+27
+obj bridge x+28
+obj bridge x+29
+
diff --git a/3D GFX/3D Synthezier/include/bridgegl.3d b/3D GFX/3D Synthezier/include/bridgegl.3d
new file mode 100644
index 0000000..4bb43a5
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/bridgegl.3d	
@@ -0,0 +1,4 @@
+obj bridge1
+set 1 glass_transp
+set 2 0
+obj nrk8 xz-90 x*30 z*3 z+1.5 y*2 y+1
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/bus.3d b/3D GFX/3D Synthezier/include/bus.3d
new file mode 100644
index 0000000..21f5753
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/bus.3d	
@@ -0,0 +1,52 @@
+obj bus_frnt
+obj bus_frnt xz180 z+9
+
+obj bus_wind x+2.5 y+1 z+2
+obj bus_wind x+2.5 y+1 z+3.5
+obj bus_wind x+2.5 y+1 z+5
+
+obj bus_wind x*-1 x-2.5 y+1 z+2
+obj bus_wind x*-1 x-2.5 y+1 z+3.5
+obj bus_wind x*-1 x-2.5 y+1 z+5
+
+obj flare_w x+1 z-0.01
+obj flare_w x*-1 x-1 z-0.01
+obj flare_r x+1 z+9.01
+obj flare_r x*-1 x-1 z+9.01
+here
+p -2.5 1 0.5
+p 2.5 1 0.5
+p 2.5 -1 0.5
+p -2.5 -1 0.5
+
+p -2.5 1 8.5
+p 2.5 1 8.5
+p 2.5 -1 8.5
+p -2.5 -1 8.5
+
+p -2.5 1 2
+p 2.5 1 2
+p -1.5 2 2
+p 1.5 2 2
+
+p -2.5 1 6.5
+p 2.5 1 6.5
+p -1.5 2 6.5
+p 1.5 2 6.5
+
+
+mtl metal_yellow
+# f 0 1 5 4
+f 1 2 6 5
+f 2 3 7 6
+f 3 0 4 7
+
+f 4 5 15 14
+f 4 12 14
+f 5 13 15
+
+mtl klaashele
+f 0 1 11 10
+f 0 8 10
+f 1 9 11
+
diff --git a/3D GFX/3D Synthezier/include/bus_frnt.3d b/3D GFX/3D Synthezier/include/bus_frnt.3d
new file mode 100644
index 0000000..62d4137
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/bus_frnt.3d	
@@ -0,0 +1,17 @@
+here
+p -2 -0.5 0
+p 2 -0.5 0
+p 2 0.5 0
+p -2 0.5 0
+
+p -2.5 -1 0.5
+p 2.5 -1 0.5
+p 2.5 1 0.5
+p -2.5 1 0.5
+
+mtl metal_yellow
+f 0 1 2 3
+f 0 1 5 4
+f 1 2 6 5
+f 2 3 7 6
+f 0 3 7 4
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/bus_wind.3d b/3D GFX/3D Synthezier/include/bus_wind.3d
new file mode 100644
index 0000000..c0f63de
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/bus_wind.3d	
@@ -0,0 +1,17 @@
+here
+p 0 0 0
+p -1 1 0
+p -1 1 0.5
+p 0 0 0.5
+
+p -1 1 1.5
+p 0 0 1.5
+
+p -2.5 1 0
+p -2.5 1 1.5
+
+mtl metal_yellow
+f 0 1 2 3
+f 1 4 7 6
+mtl klaashele
+f 2 3 5 4
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/car.3d b/3D GFX/3D Synthezier/include/car.3d
new file mode 100644
index 0000000..4d6258b
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/car.3d	
@@ -0,0 +1,33 @@
+obj car_frnt
+obj car_frnt xz180 z+4
+obj flare_w x+0.25 z-0.01
+obj flare_w x*-1 x-0.25 z-0.01
+obj flare_r x+0.25 z+4.01
+obj flare_r x*-1 x-0.25 z+4.01
+
+here
+p	-1	0.5	1
+p	1	0.5	1
+p	1	-0.5	1
+p	-1	-0.5	1
+
+p	-1	0.5	3
+p	1	0.5	3
+p	1	-0.5	3
+p	-1	-0.5	3
+
+p	-0.5	1.5	2.5
+p	0.5	1.5	2.5
+
+
+
+mtl metal_yellow
+# f 0 4 5 1
+f 1 5 6 2
+f 2 6 7 3
+f 3 7 4 0
+mtl klaashele
+f 8 9 1 0
+f 8 0 4
+f 9 1 5
+f 8 9 5 4
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/car_frnt.3d b/3D GFX/3D Synthezier/include/car_frnt.3d
new file mode 100644
index 0000000..697b6f4
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/car_frnt.3d	
@@ -0,0 +1,17 @@
+here
+p	-0.5	0.25	0
+p	0.5	0.25	0
+p	0.5	-0.25	0
+p	-0.5	-0.25	0
+
+p	-1	0.5	1
+p	1	0.5	1
+p	1	-0.5	1
+p	-1	-0.5	1
+
+mtl metal_yellow
+f 0 1 2 3
+f 0 4 5 1
+f 1 5 6 2
+f 2 6 7 3
+f 3 7 4 0
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/cars.3d b/3D GFX/3D Synthezier/include/cars.3d
new file mode 100644
index 0000000..97e1482
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/cars.3d	
@@ -0,0 +1,10 @@
+obj bus xz190 y+1
+obj car xz175 z+20 y-0.5
+obj car xz182 yz10 x+5 z+50 y-0.2
+obj car xz170 yz-5 xy10 x+1 z+60 y-1.3
+obj car xz188 yz-2 xy-5 x+3 z+34 y+0.6
+
+obj car xz5 yz1 xy15 x-5 z+55 y+0.23
+obj car xz-2 yz2 xy-3 x-10 z+32 y-1.1
+obj car xz-4 yz-8 xy-9 x-5 z+8 y+0.4
+rnd obj^car^xz3^yz-2^xy3^x-8^z+57^y+0.1 obj^pol^xz3^yz-2^xy3^x-8^z+57^y+0.1
diff --git a/3D GFX/3D Synthezier/include/flare_r.3d b/3D GFX/3D Synthezier/include/flare_r.3d
new file mode 100644
index 0000000..39a35f2
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/flare_r.3d	
@@ -0,0 +1,9 @@
+here
+p 0 0.3 0
+p 0.3 0.3 0
+p 0.3 0 0
+p 0 0 0
+p 0.4 0.15 0
+mtl light_red
+f 0 1 2 3
+f 1 2 4
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/flare_w.3d b/3D GFX/3D Synthezier/include/flare_w.3d
new file mode 100644
index 0000000..65044d0
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/flare_w.3d	
@@ -0,0 +1,9 @@
+here
+p 0 0.3 0
+p 0.3 0.3 0
+p 0.3 0 0
+p 0 0 0
+p 0.4 0.15 0
+mtl light_white
+f 0 1 2 3
+f 1 2 4
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/handrail.3d b/3D GFX/3D Synthezier/include/handrail.3d
new file mode 100644
index 0000000..91f80fe
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/handrail.3d	
@@ -0,0 +1,8 @@
+# size x=1 y=1 z=0.1
+
+set 1 pronks
+set 2 1
+obj nrk8 xz-90 y*0.1 z*0.1 y+1
+set 2 0
+obj nrk8 x*0.07 y*0.07 yz-90 
+obj nrk8 x*0.07 y*0.07 yz-90 x+0.5
diff --git a/3D GFX/3D Synthezier/include/katus.3d b/3D GFX/3D Synthezier/include/katus.3d
new file mode 100644
index 0000000..78547d1
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/katus.3d	
@@ -0,0 +1,12 @@
+here
+p	0	0	0
+p	96	0	0
+p	96	0	24
+p	0	0	24
+
+mtl kivi
+f 0 1 2 3
+
+obj toru x+12 z+12
+obj toru x+36 z+12
+obj solar x+72 z+12
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/katus2.3d b/3D GFX/3D Synthezier/include/katus2.3d
new file mode 100644
index 0000000..7fb86bf
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/katus2.3d	
@@ -0,0 +1,19 @@
+here
+p	0	0	0
+p	96	0	0
+p	96	0	24
+p	0	0	24
+
+mtl kivi
+f 0 1 2 3
+
+obj toru x+12 z+12
+# obj toru x*0.2 z*0.2 y*0.5 x+36 z+12
+obj toru x*0.4 z*0.4 y*0.5 x+30 z+6
+obj toru x*0.4 z*0.4 y*0.5 x+30 z+18
+obj toru x*0.4 z*0.4 y*0.5 x+42 z+6
+obj toru x*0.4 z*0.4 y*0.5 x+42 z+18
+
+obj bus x+60 y+1 z+2
+obj bus x+70 y+1 z+2
+obj bus x+80 y+1 z+2
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/katus3.3d b/3D GFX/3D Synthezier/include/katus3.3d
new file mode 100644
index 0000000..c8d0676
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/katus3.3d	
@@ -0,0 +1,31 @@
+here
+p	0	0	0
+p	96	0	0
+p	96	0	24
+p	0	0	24
+
+mtl kivi
+f 0 1 2 3
+
+obj pol y+0.5 x+2 z+1
+obj pol y+0.5 x+9 z+1
+obj pol y+0.5 x+16 z+1
+obj pol y+0.5 x+23 z+1
+obj pol y+0.5 x+30 z+1
+obj pol y+0.5 x+37 z+1
+obj pol y+0.5 x+44 z+1
+obj pol y+0.5 x+51 z+1
+
+obj pol y+0.5 x+2 z+13
+obj pol y+0.5 x+9 z+13
+obj pol y+0.5 x+16 z+13
+obj pol y+0.5 x+23 z+13
+obj pol y+0.5 x+30 z+13
+obj pol y+0.5 x+37 z+13
+obj pol y+0.5 x+44 z+13
+obj pol y+0.5 x+51 z+13
+
+obj bus xz90 y+1 x+70 z+6
+obj bus xz90 y+1 x+85 z+6
+obj bus xz90 y+1 x+70 z+17
+obj bus xz90 y+1 x+85 z+17
diff --git a/3D GFX/3D Synthezier/include/krs1.3d b/3D GFX/3D Synthezier/include/krs1.3d
new file mode 100644
index 0000000..ffee343
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/krs1.3d	
@@ -0,0 +1,6 @@
+# neljanurkse maja korrus
+
+obj seinp1 x-48 z-12
+obj seinp1 xz180 x+48 z+12
+obj seinl1 xz270 x-48 z+12
+obj seinl1 xz90	x+48 z-12
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/krs2.3d b/3D GFX/3D Synthezier/include/krs2.3d
new file mode 100644
index 0000000..9cac787
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/krs2.3d	
@@ -0,0 +1,9 @@
+# kuuenurkse maja 1 korrus
+
+obj seinl1 x-12 z-20.7846
+obj seinl1 xz60 x+12 z-20.7846
+obj seinl1 xz120 x+24
+obj seinl1 xz180 x+12 z+20.7846
+obj seinl1 xz240 x-12 z+20.7846
+obj seinl1 xz300 x-24 
+
diff --git a/3D GFX/3D Synthezier/include/kuppel.3d b/3D GFX/3D Synthezier/include/kuppel.3d
new file mode 100644
index 0000000..b4b8771
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/kuppel.3d	
@@ -0,0 +1,292 @@
+here
+p 0 0 0
+p  -1.0 0.0 0.0
+p -0.965926 0.0 -0.258819 
+p -0.965926 0.0 0.258819 
+p -0.965926 0.258819 0.0 
+p -0.933013 0.258819 -0.250000 
+p -0.933013 0.258819 0.250000 
+p -0.866025 0.0 -0.500000 
+p -0.866025 0.0 0.500000 
+p -0.866025 0.500000 0.0 
+p -0.836516 0.258819 -0.482963 
+p -0.836516 0.258819 0.482963 
+p -0.836516 0.500000 -0.224144 
+p -0.836516 0.500000 0.224144 
+p -0.750000 0.500000 -0.433013 
+p -0.750000 0.500000 0.433013 
+p -0.707107 0.0 -0.707107 
+p -0.707107 0.0 0.707107 
+p -0.707107 0.707107 0.0 
+p -0.683013 0.258819 -0.683013 
+p -0.683013 0.258819 0.683013 
+p -0.683013 0.707107 -0.183013 
+p -0.683013 0.707107 0.183013 
+p -0.612372 0.500000 -0.612372 
+p -0.612372 0.500000 0.612372 
+p -0.612372 0.707107 -0.353553 
+p -0.612372 0.707107 0.353553 
+p -0.500000 0.0 -0.866025 
+p -0.500000 0.0 0.866025 
+p -0.500000 0.866025 0.0 
+p -0.500000 0.707107 -0.500000 
+p -0.500000 0.707107 0.500000 
+p -0.482963 0.258819 -0.836516 
+p -0.482963 0.258819 0.836516 
+p -0.482963 0.866025 -0.129410 
+p -0.482963 0.866025 0.129410 
+p -0.433013 0.500000 -0.750000 
+p -0.433013 0.500000 0.750000 
+p -0.433013 0.866025 -0.250000 
+p -0.433013 0.866025 0.250000 
+p -0.353553 0.707107 -0.612372 
+p -0.353553 0.707107 0.612372 
+p -0.353553 0.866025 -0.353553 
+p -0.353553 0.866025 0.353553 
+p -0.258819 0.0 -0.965926 
+p -0.258819 0.0 0.965926 
+p -0.258819 0.965926 0.0 
+p -0.250000 0.258819 -0.933013 
+p -0.250000 0.258819 0.933013 
+p -0.250000 0.866025 -0.433013 
+p -0.250000 0.866025 0.433013 
+p -0.250000 0.965926 -0.066987 
+p -0.250000 0.965926 0.066987 
+p -0.224144 0.500000 -0.836516 
+p -0.224144 0.500000 0.836516 
+p -0.224144 0.965926 -0.129410 
+p -0.224144 0.965926 0.129410 
+p -0.183013 0.707107 -0.683013 
+p -0.183013 0.707107 0.683013 
+p -0.183013 0.965926 -0.183013 
+p -0.183013 0.965926 0.183013 
+p -0.129410 0.866025 -0.482963 
+p -0.129410 0.866025 0.482963 
+p -0.129410 0.965926 -0.224144 
+p -0.129410 0.965926 0.224144 
+p -0.066987 0.965926 -0.250000 
+p -0.066987 0.965926 0.250000 
+p 0.0 0.0 1.0 
+p 0.0 0.258819 0.965926 
+p 0.0 0.500000 0.866025 
+p 0.0 0.707107 0.707107 
+p 0.0 0.866025 0.500000 
+p 0.0 0.965926 0.258819 
+p 0.0 1.0 0.0 
+p 0.0 0.965926 -0.258819 
+p 0.0 0.866025 -0.500000 
+p 0.0 0.707107 -0.707107 
+p 0.0 0.500000 -0.866025 
+p 0.0 0.258819 -0.965926 
+p 0.0 0.0 -1.0 
+p 0.066987 0.965926 -0.250000 
+p 0.066987 0.965926 0.250000 
+p 0.129410 0.866025 -0.482963 
+p 0.129410 0.866025 0.482963 
+p 0.129410 0.965926 -0.224144 
+p 0.129410 0.965926 0.224144 
+p 0.183013 0.707107 -0.683013 
+p 0.183013 0.707107 0.683013 
+p 0.183013 0.965926 -0.183013 
+p 0.183013 0.965926 0.183013 
+p 0.224144 0.500000 -0.836516 
+p 0.224144 0.500000 0.836516 
+p 0.224144 0.965926 -0.129410 
+p 0.224144 0.965926 0.129410 
+p 0.250000 0.258819 -0.933013 
+p 0.250000 0.258819 0.933013 
+p 0.250000 0.866025 -0.433013 
+p 0.250000 0.866025 0.433013 
+p 0.250000 0.965926 -0.066987 
+p 0.250000 0.965926 0.066987 
+p 0.258819 0.0 -0.965926 
+p 0.258819 0.0 0.965926 
+p 0.258819 0.965926 0.0 
+p 0.353553 0.707107 -0.612372 
+p 0.353553 0.707107 0.612372 
+p 0.353553 0.866025 -0.353553 
+p 0.353553 0.866025 0.353553 
+p 0.433013 0.500000 -0.750000 
+p 0.433013 0.500000 0.750000 
+p 0.433013 0.866025 -0.250000 
+p 0.433013 0.866025 0.250000 
+p 0.482963 0.258819 -0.836516 
+p 0.482963 0.258819 0.836516 
+p 0.482963 0.866025 -0.129410 
+p 0.482963 0.866025 0.129410 
+p 0.500000 0.707107 -0.500000 
+p 0.500000 0.707107 0.500000 
+p 0.500000 0.0 -0.866025 
+p 0.500000 0.0 0.866025 
+p 0.500000 0.866025 0.0 
+p 0.612372 0.500000 -0.612372 
+p 0.612372 0.500000 0.612372 
+p 0.612372 0.707107 -0.353553 
+p 0.612372 0.707107 0.353553 
+p 0.683013 0.258819 -0.683013 
+p 0.683013 0.258819 0.683013 
+p 0.683013 0.707107 -0.183013 
+p 0.683013 0.707107 0.183013 
+p 0.707107 0.0 -0.707107 
+p 0.707107 0.0 0.707107 
+p 0.707107 0.707107 0.0 
+p 0.750000 0.500000 -0.433013 
+p 0.750000 0.500000 0.433013 
+p 0.836516 0.258819 -0.482963 
+p 0.836516 0.258819 0.482963 
+p 0.836516 0.500000 -0.224144 
+p 0.836516 0.500000 0.224144 
+p 0.866025 0.0 -0.500000 
+p 0.866025 0.0 0.500000 
+p 0.866025 0.500000 0.0 
+p 0.933013 0.258819 -0.250000 
+p 0.933013 0.258819 0.250000 
+p 0.965926 0.0 -0.258819 
+p 0.965926 0.0 0.258819 
+p 0.965926 0.258819 0.0 
+p 1.0 0.0 0.0 
+
+f 73 102 98
+f 102 119 113 98
+f 119 130 126 113
+f 130 139 135 126
+f 139 144 140 135
+f 144 145 142 140
+f 73 98 92
+f 98 113 109 92
+f 113 126 122 109
+f 126 135 131 122
+f 135 140 133 131
+f 140 142 137 133
+f 73 92 88
+f 92 109 105 88
+f 109 122 115 105
+f 122 131 120 115
+f 131 133 124 120
+f 133 137 128 124
+f 73 88 84
+f 88 105 96 84
+f 105 115 103 96
+f 115 120 107 103
+f 120 124 111 107
+f 124 128 117 111
+f 73 84 80
+f 84 96 82 80
+f 96 103 86 82
+f 103 107 90 86
+f 107 111 94 90
+f 111 117 100 94
+f 73 80 74
+f 80 82 75 74
+f 82 86 76 75
+f 86 90 77 76
+f 90 94 78 77
+f 94 100 79 78
+f 73 74 65
+f 74 75 61 65
+f 75 76 57 61
+f 76 77 53 57
+f 77 78 47 53
+f 78 79 44 47
+f 73 65 63
+f 65 61 49 63
+f 61 57 40 49
+f 57 53 36 40
+f 53 47 32 36
+f 47 44 27 32
+f 73 63 59
+f 63 49 42 59
+f 49 40 30 42
+f 40 36 23 30
+f 36 32 19 23
+f 32 27 16 19
+f 73 59 55
+f 59 42 38 55
+f 42 30 25 38
+f 30 23 14 25
+f 23 19 10 14
+f 19 16 7 10
+f 73 55 51
+f 55 38 34 51
+f 38 25 21 34
+f 25 14 12 21
+f 14 10 5 12
+f 10 7 2 5
+f 73 51 46
+f 51 34 29 46
+f 34 21 18 29
+f 21 12 9 18
+f 12 5 4 9
+f 5 2 1 4
+f 73 46 52
+f 46 29 35 52
+f 29 18 22 35
+f 18 9 13 22
+f 9 4 6 13
+f 4 1 3 6
+f 73 52 56
+f 52 35 39 56
+f 35 22 26 39
+f 22 13 15 26
+f 13 6 11 15
+f 6 3 8 11
+f 73 56 60
+f 56 39 43 60
+f 39 26 31 43
+f 26 15 24 31
+f 15 11 20 24
+f 11 8 17 20
+f 73 60 64
+f 60 43 50 64
+f 43 31 41 50
+f 31 24 37 41
+f 24 20 33 37
+f 20 17 28 33
+f 73 64 66
+f 64 50 62 66
+f 50 41 58 62
+f 41 37 54 58
+f 37 33 48 54
+f 33 28 45 48
+f 73 66 72
+f 66 62 71 72
+f 62 58 70 71
+f 58 54 69 70
+f 54 48 68 69
+f 48 45 67 68
+f 73 72 81
+f 72 71 83 81
+f 71 70 87 83
+f 70 69 91 87
+f 69 68 95 91
+f 68 67 101 95
+f 73 81 85
+f 81 83 97 85
+f 83 87 104 97
+f 87 91 108 104
+f 91 95 112 108
+f 95 101 118 112
+f 73 85 89
+f 85 97 106 89
+f 97 104 116 106
+f 104 108 121 116
+f 108 112 125 121
+f 112 118 129 125
+f 73 89 93
+f 89 106 110 93
+f 106 116 123 110
+f 116 121 132 123
+f 121 125 134 132
+f 125 129 138 134
+f 73 93 99
+f 93 110 114 99
+f 110 123 127 114
+f 123 132 136 127
+f 132 134 141 136
+f 134 138 143 141
+f 73 99 102
+f 99 114 119 102
+f 114 127 130 119
+f 127 136 139 130
+f 136 141 144 139
+f 141 143 145 144
diff --git a/3D GFX/3D Synthezier/include/maja.3d b/3D GFX/3D Synthezier/include/maja.3d
new file mode 100644
index 0000000..55c11e5
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/maja.3d	
@@ -0,0 +1,33 @@
+obj krs1 y-90
+obj krs1 y-87
+obj krs1 y-84
+obj krs1 y-81
+obj krs1 y-78
+obj krs1 y-75
+obj krs1 y-72
+obj krs1 y-69
+obj krs1 y-66
+obj krs1 y-63
+obj krs1 y-60
+obj krs1 y-57
+obj krs1 y-54
+obj krs1 y-51
+obj krs1 y-48
+obj krs1 y-45
+obj krs1 y-42
+obj krs1 y-39
+obj krs1 y-36
+obj krs1 y-33
+obj krs1 y-30
+obj krs1 y-27
+obj krs1 y-24
+obj krs1 y-21
+obj krs1 y-18
+obj krs1 y-15
+obj krs1 y-12
+obj krs1 y-9
+obj krs1 y-6
+obj krs1 y-3
+obj krs1
+obj krs1 y+3
+rnd obj^katus^x-48^z-12^y+3 obj^katus2^x-48^z-12^y+3 obj^katus3^x-48^z-12^y+3
diff --git a/3D GFX/3D Synthezier/include/nrk4.3d b/3D GFX/3D Synthezier/include/nrk4.3d
new file mode 100644
index 0000000..296dc22
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/nrk4.3d	
@@ -0,0 +1,29 @@
+# 1 	-body material
+# 2 = 1	-ends filled
+#
+#   0--1
+#   |  | Y
+#   3--2
+#
+#    X
+
+here
+p -0.5 0.5 0
+p 0.5 0.5 0
+p 0.5 -0.5 0
+p -0.5 -0.5 0
+
+p -0.5 0.5 1
+p 0.5 0.5 1
+p 0.5 -0.5 1
+p -0.5 -0.5 1
+
+mtl %1
+f 0 1 5 4
+f 1 2 6 5
+f 2 3 7 6
+f 3 0 4 7
+
+cmp 0 %2 1
+?0 f 0 1 2 3
+?0 f 4 5 6 7
diff --git a/3D GFX/3D Synthezier/include/nrk6.3d b/3D GFX/3D Synthezier/include/nrk6.3d
new file mode 100644
index 0000000..d096deb
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/nrk6.3d	
@@ -0,0 +1,33 @@
+# 1 	-body material
+# 2 = 1	-ends filled
+
+here
+p       -0.5    0       0.866
+p       0.5     0       0.866
+p    	1   	0    	0
+p       0.5     0       -0.866
+p       -0.5    0       -0.866
+p       -1      0       0
+
+p       -0.5    1       0.866
+p       0.5     1       0.866
+p    	1   	1    	0
+p       0.5     1       -0.866
+p       -0.5    1       -0.866
+p     	-1      1       0
+
+mtl %1
+f 0 1 7 6
+f 1 2 8 7
+f 2 3 9 8
+f 3 4 10 9
+f 4 5 11 10
+f 5 0 6 11
+
+cmp 0 %2 1
+?0 f 0 1 2 3
+?0 f 3 4 5 0
+?0 f 6 7 8 9
+?0 f 9 10 11 6
+
+
diff --git a/3D GFX/3D Synthezier/include/nrk8.3d b/3D GFX/3D Synthezier/include/nrk8.3d
new file mode 100644
index 0000000..5e7986a
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/nrk8.3d	
@@ -0,0 +1,47 @@
+# 1 	-body material
+# 2 = 1	-ends filled
+#
+#   0--1
+# 7/    \2
+# |  *   |  Y
+# 6\    /3
+#   5--4
+#
+#    X
+
+here
+p -0.333 1 0
+p 0.333 1 0
+p 1 0.333 0
+p 1 -0.333 0
+p 0.333 -1 0
+p -0.333 -1 0
+p -1 -0.333 0
+p -1 0.333 0
+
+p -0.333 1 1
+p 0.333 1 1
+p 1 0.333 1
+p 1 -0.333 1
+p 0.333 -1 1
+p -0.333 -1 1
+p -1 -0.333 1
+p -1 0.333 1
+
+mtl %1
+f 0 1 9 8
+f 1 2 10 9
+f 2 3 11 10
+f 3 4 12 11
+f 4 5 13 12
+f 5 6 14 13
+f 6 7 15 14
+f 7 0 8 15
+
+cmp 0 %2 1
+?0 f 0 1 4 5
+?0 f 1 2 3 4
+?0 f 0 5 6 7
+?0 f 8 9 12 13
+?0 f 9 10 11 12
+?0 f 8 13 14 15
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/plaat.3d b/3D GFX/3D Synthezier/include/plaat.3d
new file mode 100644
index 0000000..8255032
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/plaat.3d	
@@ -0,0 +1,19 @@
+here
+p	-0.1	-0.01	-0.1
+p	0.1	-0.01	-0.1
+p	0.1	-0.01	0.1
+p	-0.1	-0.01	0.1
+
+p	-0.1	0.01	-0.1
+p	0.1	0.01	-0.1
+p	0.1	0.01	0.1
+p	-0.1	0.01	0.1
+
+mtl kivi
+f 0 1 2 3
+f 4 5 6 7
+
+f 0 1 5 4
+f 1 2 6 5
+f 2 3 7 6
+f 3 0 4 7
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/pol.3d b/3D GFX/3D Synthezier/include/pol.3d
new file mode 100644
index 0000000..256589d
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/pol.3d	
@@ -0,0 +1,37 @@
+obj pol_frnt
+obj pol_frnt z*-1 z+5
+obj pol_ceil x*1.5 z+1.5 y+0.5
+obj flare_w x+0.5 z-0.01 y-0.1
+obj flare_w x*-1 x-0.5 z-0.01 y-0.1
+obj flare_r x+0.5 z+5.01 y-0.1
+obj flare_r x*-1 x-0.5 z+5.01 y-0.1
+
+here
+p -1.25 0.5 0.5
+p 1.25 0.5 0.5
+p 1.5 0.25 0.5
+p 1.5 -0.25 0.5
+p 1.25 -0.5 0.5
+p -1.25 -0.5 0.5
+p -1.5 -0.25 0.5
+p -1.5 0.25 0.5
+
+p -1.25 0.5 4.5
+p 1.25 0.5 4.5
+p 1.5 0.25 4.5
+p 1.5 -0.25 4.5
+p 1.25 -0.5 4.5
+p -1.25 -0.5 4.5
+p -1.5 -0.25 4.5
+p -1.5 0.25 4.5
+ 
+mtl metal_blue
+f 0 1 9 8
+f 1 2 10 9
+f 2 3 11 10
+f 3 4 12 11
+f 4 5 13 12
+f 5 6 14 13
+f 6 7 15 14
+f 7 0 8 15
+
diff --git a/3D GFX/3D Synthezier/include/pol_ceil.3d b/3D GFX/3D Synthezier/include/pol_ceil.3d
new file mode 100644
index 0000000..68cb41a
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/pol_ceil.3d	
@@ -0,0 +1,21 @@
+here
+p -0.5 0.5 0.75
+p 0.5 0.5 0.75
+p 0.5 0 0
+p -0.5 0 0
+p -0.75 0 0.75
+p 0.75 0 0.75
+
+p -0.5 0.5 2.25
+p 0.5 0.5 2.25
+p 0.5 0 2.25
+p -0.5 0 2.25
+mtl klaashele
+f 0 1 2 3
+f 0 3 4
+f 1 2 5
+
+f 0 1 7 6
+f 1 5 8 7
+f 0 4 9 6
+f 6 7 8 9
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/pol_frnt.3d b/3D GFX/3D Synthezier/include/pol_frnt.3d
new file mode 100644
index 0000000..826e568
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/pol_frnt.3d	
@@ -0,0 +1,24 @@
+here
+p -1.25 0.25 0
+p 1.25 0.25 0
+p 1.25 -0.25 0
+p -1.25 -0.25 0
+
+p -1.25 0.5 0.5
+p 1.25 0.5 0.5
+p 1.5 0.25 0.5
+p 1.5 -0.25 0.5
+p 1.25 -0.5 0.5
+p -1.25 -0.5 0.5
+p -1.5 -0.25 0.5
+p -1.5 0.25 0.5
+mtl metal_blue
+f 0 1 2 3
+f 0 4 5 1
+f 1 5 6
+f 1 6 7 2
+f 2 7 8
+f 2 8 9 3
+f 3 9 10
+f 3 10 11 0
+f 0 11 4
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/ring.3d b/3D GFX/3D Synthezier/include/ring.3d
new file mode 100644
index 0000000..7d19916
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/ring.3d	
@@ -0,0 +1,52 @@
+here
+p 0 0 0
+p -1.0 0.0 0.0
+p -0.965926 0.0 -0.258819 
+p -0.965926 0.0 0.258819 
+p -0.866025 0.0 -0.500000 
+p -0.866025 0.0 0.500000 
+p -0.707107 0.0 -0.707107 
+p -0.707107 0.0 0.707107 
+p -0.500000 0.0 -0.866025 
+p -0.500000 0.0 0.866025 
+p -0.258819 0.0 -0.965926 
+p -0.258819 0.0 0.965926 
+p 0.0 0.0 -1.0 
+p 0.0 0.0 0.0 
+p 0.0 0.0 1.0 
+p 0.258819 0.0 0.965926 
+p 0.258819 0.0 -0.965926 
+p 0.500000 0.0 0.866025 
+p 0.500000 0.0 -0.866025 
+p 0.707107 0.0 -0.707107 
+p 0.707107 0.0 0.707107 
+p 0.866025 0.0 -0.500000 
+p 0.866026 0.0 0.500000 
+p 0.965926 0.0 -0.258819 
+p 0.965926 0.0 0.258819 
+p 1.0 0.0 0.0 
+
+f 13 25 23
+f 13 23 21
+f 13 21 19
+f 13 19 18
+f 13 18 16
+f 13 16 12
+f 13 12 10
+f 13 10 8
+f 13 8 6
+f 13 6 4
+f 13 4 2
+f 13 2 1
+f 13 1 3
+f 13 3 5
+f 13 5 7
+f 13 7 9
+f 13 9 11
+f 13 11 14
+f 13 14 15
+f 13 15 17
+f 13 17 20
+f 13 20 22
+f 13 22 24
+f 13 24 25
diff --git a/3D GFX/3D Synthezier/include/seinl1.3d b/3D GFX/3D Synthezier/include/seinl1.3d
new file mode 100644
index 0000000..b6bf757
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/seinl1.3d	
@@ -0,0 +1,9 @@
+obj blk1
+obj blk2 x+6
+obj blk2 x+12
+obj blk1 x+18
+
+rnd obj^pol^xz-92^z-6^x+1 dum dum dum dum
+rnd obj^car^xz91^z-10^x+5 dum dum dum dum
+rnd obj^car^xz87^z-8^x+19 dum dum dum dum
+rnd obj^bus^xz-90^z-12^x+10 dum dum dum dum dum dum dum dum
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/seinp1.3d b/3D GFX/3D Synthezier/include/seinp1.3d
new file mode 100644
index 0000000..b8499db
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/seinp1.3d	
@@ -0,0 +1,19 @@
+obj blk1
+obj blk1 x+6
+obj blk1 x+12
+obj blk2 x+18
+
+obj blk2 x+24
+obj blk1 x+30
+obj blk1 x+36
+obj blk1 x+42
+
+obj blk1 x+48
+obj blk1 x+54
+obj blk1 x+60
+obj blk2 x+66
+
+obj blk2 x+72
+obj blk1 x+78
+obj blk1 x+84
+obj blk1 x+90
diff --git a/3D GFX/3D Synthezier/include/solar.3d b/3D GFX/3D Synthezier/include/solar.3d
new file mode 100644
index 0000000..a898eec
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/solar.3d	
@@ -0,0 +1,23 @@
+here
+p	-3	0	-3
+p	3	0	-3
+p	3	0	3
+p	-3	0	3
+
+p	-3	15	-3
+p	3	15	-3
+p	3	15	3
+p	-3	15	3
+
+p	-20	6	-9
+p	20	6	-9
+p	10	24	9
+p	-10	24	9
+
+mtl pronks
+f 0 1 5 4
+f 1 2 6 5
+f 2 3 7 6
+f 3 0 4 7
+mtl solar
+f 8 9 10 11
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/toru.3d b/3D GFX/3D Synthezier/include/toru.3d
new file mode 100644
index 0000000..0f91bfb
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/toru.3d	
@@ -0,0 +1,38 @@
+here
+p 0 0 10
+p 0 5 10
+
+p 7.071067 0 7.071069
+p 7.071067 5 7.071069
+
+p 10 0 3.139165E-06
+p 10 5 3.139165E-06
+
+p 7.071071 0 -7.071064
+p 7.071071 5 -7.071064
+
+p 6.27833E-06 0 -10
+p 6.27833E-06 5 -10
+
+p -7.071062 0 -7.071074
+p -7.071062 5 -7.071074
+
+p -10 0 -9.417495E-06
+p -10 5 -9.417495E-06
+
+p -7.071075 0 7.07106
+p -7.071075 5 7.07106
+mtl pronks
+f 0 1 3 2
+f 2 3 5 4
+f 4 5 7 6
+f 6 7 9 8
+
+f 8 9 11 10
+f 10 11 13 12
+f 12 13 15 14
+f 14 15 1 0
+
+f 1 3 5 7
+f 1 7 9 15
+f 9 11 13 15
\ No newline at end of file
diff --git a/3D GFX/3D Synthezier/include/vedru.3d b/3D GFX/3D Synthezier/include/vedru.3d
new file mode 100644
index 0000000..6d238b8
--- /dev/null
+++ b/3D GFX/3D Synthezier/include/vedru.3d	
@@ -0,0 +1,51 @@
+obj plaat xz20 x+0 y+0 z+1
+obj plaat xz18.42122 x+.3894183 y+.1333333 z+.921061
+obj plaat xz13.93413 x+.7173561 y+.2666667 z+.6967067
+obj plaat xz7.247154 x+.9320391 y+.4 z+.3623577
+obj plaat xz-.5839909 x+.9995736 y+.5333334 z-2.919955E-02
+obj plaat xz-8.322937 x+.9092974 y+.6666667 z-.4161468
+obj plaat xz-14.74788 x+.6754631 y+.8 z-.7373938
+obj plaat xz-18.84445 x+.334988 y+.9333334 z-.9422224
+obj plaat xz-19.96589 x-5.837443E-02 y+1.066667 z-.9982948
+obj plaat xz-17.93517 x-.4425208 y+1.2 z-.8967583
+obj plaat xz-13.07286 x-.7568028 y+1.333333 z-.6536433
+obj plaat xz-6.146646 x-.9516022 y+1.466667 z-.3073323
+obj plaat xz1.749993 x-.9961646 y+1.6 z+8.749965E-02
+obj plaat xz9.370347 x-.8834543 y+1.733334 z+.4685173
+obj plaat xz15.51133 x-.631266 y+1.866667 z+.7755664
+obj plaat xz19.20341 x-.2794146 y+2 z+.9601706
+obj plaat xz19.8637 x+.1165502 y+2.133334 z+.9931848
+obj plaat xz17.38794 x+.4941143 y+2.266667 z+.8693969
+obj plaat xz12.16701 x+.7936686 y+2.4 z+.6083503
+obj plaat xz5.025171 x+.96792 y+2.533334 z+.2512586
+obj plaat xz-2.910019 x+.9893581 y+2.666667 z-.145501
+obj plaat xz-10.38578 x+.8545986 y+2.8 z-.5192891
+obj plaat xz-16.22186 x+.584917 y+2.933333 z-.8110932
+obj plaat xz-19.49687 x+.2228901 y+3.066667 z-.9748436
+obj plaat xz-19.69376 x-.1743262 y+3.2 z-.984688
+obj plaat xz-16.78144 x-.5440203 y+3.333333 z-.839072
+obj plaat xz-11.21971 x-.8278257 y+3.466666 z-.5609854
+obj plaat xz-3.886632 x-.9809359 y+3.599999 z-.1943316
+obj plaat xz4.060056 x-.9791781 y+3.733333 z+.2030028
+obj plaat xz11.36575 x-.82283 y+3.866666 z+.5682876
+obj plaat xz16.87705 x-.5365753 y+3.999999 z+.8438524
+obj plaat xz19.72383 x-.1656074 y+4.133332 z+.9861917
+obj plaat xz19.45667 x+.2315063 y+4.266665 z+.9728334
+obj plaat xz16.11773 x+.5920703 y+4.399999 z+.8058863
+obj plaat xz10.23416 x+.8591596 y+4.533332 z+.5117078
+obj plaat xz2.734839 x+.9906067 y+4.666665 z+.1367419
+obj plaat xz-5.196248 x+.9656591 y+4.799998 z-.2598124
+obj plaat xz-12.30696 x+.7882555 y+4.933331 z-.6153481
+obj plaat xz-17.47468 x+.4864039 y+5.066665 z-.8737341
+obj plaat xz-19.88354 x+.1077599 y+5.199998 z-.9941769
+obj plaat xz-19.15323 x-.2878969 y+5.333331 z-.9576614
+obj plaat xz-15.39904 x-.638102 y+5.466665 z-.7699519
+obj plaat xz-9.213687 x-.8875641 y+5.599998 z-.4606843
+obj plaat xz-1.573701 x-.9968995 y+5.733331 z-7.868504E-02
+obj plaat xz6.314738 x-.9488468 y+5.866664 z+.3157369
+obj plaat xz13.20622 x-.7509923 y+5.999998 z+.660311
+obj plaat xz18.01273 x-.4345728 y+6.133331 z+.9006367
+obj plaat xz19.97544 x-4.954402E-02 y+6.266664 z+.998772
+obj plaat xz18.78447 x+.3433067 y+6.399997 z+.9392233
+obj plaat xz14.62785 x+.6819569 y+6.53333 z+.7313923
+obj plaat xz8.161816 x+.9129413 y+6.666664 z+.4080908
diff --git a/3D GFX/3D land.bas b/3D GFX/3D land.bas
new file mode 100755
index 0000000..5a7c5e2
--- /dev/null
+++ b/3D GFX/3D land.bas	
@@ -0,0 +1,115 @@
+DECLARE SUB DrawQuadrilateral (xCoord1%, yCoord1%, xCoord2%, yCoord2%, xCoord3%, yCoord3%, xCoord4%, yCoord4%, colorVal%)
+' Program to render 3D shaded landscape with perspective and distortion effects.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 1999, Initial version
+' 2024 - 2025, Improved program readability
+
+DECLARE SUB SetPalette ()
+DEFINT A-Z
+' Declare shared arrays for X and Y coordinates
+DIM SHARED xCoordinates(1 TO 40, 1 TO 40)
+DIM SHARED yCoordinates(1 TO 40, 1 TO 40)
+
+' Set screen mode to 12: 640x480 pixels, 16 colors
+SCREEN 12
+
+' Initialize color palette
+SetPalette
+
+' Set initial scaling factor
+scalingFactor = 1.5
+
+' Main loop start
+1 :
+' Loop through each point in the grid
+FOR rowIndex = 1 TO 40
+    FOR colIndex = 1 TO 40
+        ' Calculate the position with distortion
+        xPos = 120 + (colIndex * 10)
+        yPos = 200 + (rowIndex * 3)
+        
+        ' Apply a cosine distortion based on distance from center
+        yPos = yPos - COS(SQR((colIndex - 20) ^ 2 + (rowIndex - 20) ^ 2) / scalingFactor) * 20
+
+        ' Apply perspective transformation
+        xPos = (xPos - 320) * (rowIndex + 50) / 50 + 320
+        yPos = (yPos - 240) * (rowIndex + 50) / 50 + 240
+
+        ' Store the transformed coordinates
+        xCoordinates(colIndex, rowIndex) = xPos
+        yCoordinates(colIndex, rowIndex) = yPos
+    NEXT colIndex
+NEXT rowIndex
+
+' Draw grid based on the stored coordinates
+FOR rowIndex = 1 TO 39
+    FOR colIndex = 1 TO 39
+        ' Alternate colors for each box
+        IF (colIndex + rowIndex) \ 2 <> (colIndex + rowIndex + 1) \ 2 THEN colorIndex = 0 ELSE colorIndex = 5
+       
+        ' Calculate a brightness factor
+        brightnessFactor = rowIndex + (colIndex / 3)
+       
+        ' Draw the quadrilateral with the calculated color and brightness
+        DrawQuadrilateral xCoordinates(colIndex, rowIndex), yCoordinates(colIndex, rowIndex), xCoordinates(colIndex + 1, rowIndex), yCoordinates(colIndex + 1, rowIndex), xCoordinates(colIndex, rowIndex + 1), yCoordinates(colIndex, rowIndex + 1),  _
+xCoordinates(colIndex + 1, rowIndex + 1), yCoordinates(colIndex + 1, rowIndex + 1), colorIndex
+    NEXT colIndex
+NEXT rowIndex
+
+' Wait for user input and adjust the scaling factor
+userInput$ = INPUT$(1)
+scalingFactor = scalingFactor * 1.9
+
+' Clear the screen for the next iteration
+CLS
+
+' If the scaling factor is too large, exit the program
+IF scalingFactor > 10 THEN SYSTEM
+
+' Jump back to the main loop start
+GOTO 1
+
+' Subroutine to draw a filled box using line drawing
+SUB DrawQuadrilateral (xCoord1, yCoord1, xCoord2, yCoord2, xCoord3, yCoord3, xCoord4, yCoord4, colorVal)
+    ' Fills a quadrilateral area by connecting the edges.
+    ' It uses a scanline approach, storing intersection points, then drawing horizontal lines between those intersection points.
+    ' Adjust color index based on position and brightness factor
+    colorVal = colorVal + (yCoord2 - yCoord1) / 3.5 + (brightnessFactor / 8) + 4
+    ' Ensure the color index is within valid range
+    IF colorVal < 0 THEN colorVal = 0
+    IF colorVal > 15 THEN colorVal = 15
+    ' Calculate the length of the longer side
+    sideLength1 = SQR((xCoord1 - xCoord2) ^ 2 + (yCoord1 - yCoord2) ^ 2)
+    sideLength2 = SQR((xCoord3 - xCoord4) ^ 2 + (yCoord3 - yCoord4) ^ 2)
+    IF sideLength2 < sideLength1 THEN sideLength2 = sideLength1
+    ' Draw the box using lines
+    FOR lineIndex = 1 TO sideLength2
+        xCoord5 = (xCoord2 - xCoord1) * lineIndex / sideLength2 + xCoord1
+        yCoord5 = (yCoord2 - yCoord1) * lineIndex / sideLength2 + yCoord1
+        xCoord6 = (xCoord4 - xCoord3) * lineIndex / sideLength2 + xCoord3
+        yCoord6 = (yCoord4 - yCoord3) * lineIndex / sideLength2 + yCoord3
+        ' Draw two adjacent lines to create a filled effect
+        LINE (xCoord5, yCoord5)-(xCoord6, yCoord6), colorVal
+        LINE (xCoord5 + 1, yCoord5)-(xCoord6 + 1, yCoord6), colorVal
+    NEXT lineIndex
+END SUB
+
+' Subroutine to initialize color palette
+SUB SetPalette
+    ' Initializes the color palette for the screen.
+    ' It sets the RGB values for each color index in the palette.
+    FOR paletteIndex = 1 TO 16
+        ' Set the color values for each palette entry
+        OUT &H3C8, paletteIndex
+        OUT &H3C9, paletteIndex * 4
+        OUT &H3C9, paletteIndex * 4
+        OUT &H3C9, paletteIndex * 3
+    NEXT paletteIndex
+END SUB
+
diff --git a/3D GFX/3D land.webm b/3D GFX/3D land.webm
new file mode 100644
index 0000000..1e60d2d
Binary files /dev/null and b/3D GFX/3D land.webm differ
diff --git a/3D GFX/Anaglyph.bas b/3D GFX/Anaglyph.bas
new file mode 100755
index 0000000..10d6a4b
--- /dev/null
+++ b/3D GFX/Anaglyph.bas	
@@ -0,0 +1,465 @@
+' Projects realtime anaglyph with bouncing cubes. Colored glasses required to view stereo effect.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2004.07, Initial version
+' 2024 - 2025, Improved program readability
+
+' Controls:
+' arrow keys - move around
+' 2, 6, 4, 8 - look around
+' -          - fly up
+' +          - fly down
+' q, w       - change horizontal distance between left and right view
+
+DECLARE SUB DrawLine (x1%, y1%, x2%, y2%)
+DECLARE SUB CreateCube ()
+DECLARE SUB PlaceCubes ()
+DECLARE SUB RenderScene ()
+DECLARE SUB InitializeEnvironment ()
+DECLARE SUB InitializeProgram ()
+
+DIM SHARED originalPointCount, originalLineCount, currentPointCount, currentLineCount
+DIM SHARED pointX(1 TO 1000)
+DIM SHARED pointY(1 TO 1000)
+DIM SHARED pointZ(1 TO 1000)
+
+DIM SHARED projectedX(1 TO 1000)
+DIM SHARED projectedXRight(1 TO 1000)
+DIM SHARED projectedY(1 TO 1000)
+
+DIM SHARED originalProjectedX(1 TO 1000)
+DIM SHARED originalProjectedXRight(1 TO 1000)
+DIM SHARED originalProjectedY(1 TO 1000)
+DIM SHARED originalProjectedPointCount
+DIM SHARED lineStart(1 TO 1000)
+DIM SHARED lineEnd(1 TO 1000)
+DIM SHARED lineColor(1 TO 1000)
+DIM SHARED originalLineStart(1 TO 1000)
+DIM SHARED originalLineEnd(1 TO 1000)
+DIM SHARED originalProjectedLineCount
+
+DIM SHARED cameraX, cameraY, cameraZ
+DIM SHARED cameraXSpeed, cameraYSpeed, cameraZSpeed
+DIM SHARED rotationAngle1, rotationAngle2
+DIM SHARED rotationAngle1Speed, rotationAngle2Speed
+DIM SHARED cubeX(1 TO 10)
+DIM SHARED cubeY(1 TO 10)
+DIM SHARED cubeZ(1 TO 10)
+DIM SHARED cubeXSpeed(1 TO 10)
+DIM SHARED cubeYSpeed(1 TO 10)
+DIM SHARED cubeZSpeed(1 TO 10)
+DIM SHARED cubeCount
+DIM SHARED horizontalViewDistance
+
+DIM SHARED movementSpeed
+
+movementSpeed = 4
+'ON ERROR GOTO 2
+
+InitializeProgram
+InitializeEnvironment
+PlaceCubes
+horizontalViewDistance = -.1
+1
+PCOPY 0, 1
+CLS
+
+currentPointCount = originalPointCount
+currentLineCount = originalLineCount
+
+CreateCube
+RenderScene
+
+cameraX = cameraX + cameraXSpeed
+cameraY = cameraY + cameraYSpeed
+cameraZ = cameraZ + cameraZSpeed
+rotationAngle1 = rotationAngle1 + rotationAngle1Speed
+rotationAngle2 = rotationAngle2 + rotationAngle2Speed
+
+inputKey$ = INKEY$
+IF inputKey$ <> "" THEN
+    IF inputKey$ = CHR$(0) + "H" THEN
+        ' Move forward
+        cameraZSpeed = cameraZSpeed - SIN(rotationAngle1) / 100
+        cameraXSpeed = cameraXSpeed - COS(rotationAngle1) / 100
+    END IF
+    IF inputKey$ = CHR$(0) + "P" THEN
+        ' Move backward
+        cameraZSpeed = cameraZSpeed + SIN(rotationAngle1) / 100
+        cameraXSpeed = cameraXSpeed + COS(rotationAngle1) / 100
+    END IF
+    IF inputKey$ = CHR$(0) + "M" THEN
+        ' Strafe left
+        cameraZSpeed = cameraZSpeed + COS(rotationAngle1) / 100
+        cameraXSpeed = cameraXSpeed - SIN(rotationAngle1) / 100
+    END IF
+    IF inputKey$ = CHR$(0) + "K" THEN
+        ' Strafe right
+        cameraZSpeed = cameraZSpeed - COS(rotationAngle1) / 100
+        cameraXSpeed = cameraXSpeed + SIN(rotationAngle1) / 100
+    END IF
+
+    IF inputKey$ = "6" THEN rotationAngle1Speed = rotationAngle1Speed - .01
+    IF inputKey$ = "4" THEN rotationAngle1Speed = rotationAngle1Speed + .01
+    IF inputKey$ = "8" THEN rotationAngle2Speed = rotationAngle2Speed - .01
+    IF inputKey$ = "2" THEN rotationAngle2Speed = rotationAngle2Speed + .01
+    IF inputKey$ = "+" THEN cameraYSpeed = cameraYSpeed - .01
+    IF inputKey$ = "-" THEN cameraYSpeed = cameraYSpeed + .01
+    IF inputKey$ = "q" THEN horizontalViewDistance = horizontalViewDistance - .01
+    IF inputKey$ = "w" THEN horizontalViewDistance = horizontalViewDistance + .01
+    IF inputKey$ = " " THEN
+        ' Slow down movements
+        cameraXSpeed = cameraXSpeed / 2
+        cameraYSpeed = cameraYSpeed / 2
+        cameraZSpeed = cameraZSpeed / 2
+
+        rotationAngle1Speed = rotationAngle1Speed / 2
+        rotationAngle2Speed = rotationAngle2Speed / 2
+    END IF
+    IF inputKey$ = CHR$(27) THEN SYSTEM
+END IF
+GOTO 1
+2
+END
+RESUME
+
+SUB InitializeEnvironment
+
+' This subroutine initializes the environment by creating points and lines.
+FOR worldZ = -5 TO 5
+    FOR worldX = -5 TO 5
+        currentPointCount = currentPointCount + 1
+        pointX(currentPointCount) = worldX
+        pointY(currentPointCount) = SIN(SQR(worldX * worldX + worldZ * worldZ) / 2)
+        pointZ(currentPointCount) = worldZ
+        IF worldX > -5 THEN
+            currentLineCount = currentLineCount + 1
+            lineStart(currentLineCount) = currentPointCount
+            lineEnd(currentLineCount) = currentPointCount - 1
+            lineColor(currentLineCount) = 3
+        END IF
+        IF worldZ > -5 THEN
+            currentLineCount = currentLineCount + 1
+            lineStart(currentLineCount) = currentPointCount
+            lineEnd(currentLineCount) = currentPointCount - 11
+            lineColor(currentLineCount) = 3
+        END IF
+    NEXT worldX
+NEXT worldZ
+
+originalPointCount = currentPointCount
+originalLineCount = currentLineCount
+
+END SUB
+
+SUB InitializeEnvironment1
+
+' This subroutine initializes the environment with a simple setup.
+currentPointCount = 1
+pointX(currentPointCount) = -2
+pointY(currentPointCount) = 0
+pointZ(currentPointCount) = 0
+
+currentPointCount = currentPointCount + 1
+pointX(currentPointCount) = 2
+pointY(currentPointCount) = 0
+pointZ(currentPointCount) = 0
+
+currentLineCount = 1
+lineStart(currentLineCount) = 1
+lineEnd(currentLineCount) = 2
+lineColor(currentLineCount) = 14
+
+END SUB
+
+SUB DrawLine (x1%, y1%, x2%, y2%)
+
+' This subroutine draws a line between two points using a custom algorithm.
+' It calculates intermediate points and sets pixels with appropriate colors.
+' The color is inverted if the point is already set to avoid overwriting.
+
+lineLength = ABS(x1% - x2%)
+lineLength2 = ABS(y1% - y2%)
+IF lineLength2 > lineLength THEN lineLength = lineLength2
+IF lineLength < 2 THEN GOTO 101
+
+xDelta = x2% - x1%
+yDelta = y2% - y1%
+
+FOR stp% = 1 TO lineLength
+    x = xDelta * stp% / lineLength + x1%
+    y = yDelta * stp% / lineLength + y1%
+    currentColor = POINT(x, y)
+    IF currentColor = 0 THEN PSET (x, y), 2
+    IF currentColor = 1 THEN PSET (x, y), 3
+NEXT stp%
+101
+END SUB
+
+SUB DrawLineRight (x1, y1, x2, y2)
+' This subroutine draws a line using the LINE statement for the right eye view.
+LINE (x1, y1)-(x2, y2), 1
+END SUB
+
+SUB CreateCube
+
+' This subroutine updates the positions of the cubes and adds their edges to the environment.
+FOR cubeIndex = 1 TO cubeCount
+    worldX = cubeX(cubeIndex)
+    worldY = cubeY(cubeIndex)
+    worldZ = cubeZ(cubeIndex)
+
+    velocityX = cubeXSpeed(cubeIndex)
+    velocityY = cubeYSpeed(cubeIndex)
+    velocityZ = cubeZSpeed(cubeIndex)
+
+    ' Apply gravity to the cube's vertical movement
+    velocityY = velocityY - .01
+
+    ' Calculate new positions based on velocity and speed
+    worldX = worldX + velocityX / movementSpeed
+    worldY = worldY + velocityY / movementSpeed
+    worldZ = worldZ + velocityZ / movementSpeed
+
+    ' Bounce from boundaries
+    IF worldX > 5 THEN velocityX = -.1
+    IF worldZ > 5 THEN velocityZ = -.1
+    IF worldX < -5 THEN velocityX = .1
+    IF worldZ < -5 THEN velocityZ = .1
+    IF worldY < .5 THEN velocityY = RND * .2 + .1
+
+    ' Add cube edges to the environment
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 1
+    lineEnd(currentLineCount) = currentPointCount + 2
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 3
+    lineEnd(currentLineCount) = currentPointCount + 2
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 3
+    lineEnd(currentLineCount) = currentPointCount + 4
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 1
+    lineEnd(currentLineCount) = currentPointCount + 4
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 1
+    lineEnd(currentLineCount) = currentPointCount + 5
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 2
+    lineEnd(currentLineCount) = currentPointCount + 6
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 3
+    lineEnd(currentLineCount) = currentPointCount + 7
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 4
+    lineEnd(currentLineCount) = currentPointCount + 8
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 5
+    lineEnd(currentLineCount) = currentPointCount + 6
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 7
+    lineEnd(currentLineCount) = currentPointCount + 6
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 7
+    lineEnd(currentLineCount) = currentPointCount + 8
+    lineColor(currentLineCount) = 14
+
+    currentLineCount = currentLineCount + 1
+    lineStart(currentLineCount) = currentPointCount + 5
+    lineEnd(currentLineCount) = currentPointCount + 8
+    lineColor(currentLineCount) = 14
+
+    ' Add cube vertices to the environment
+    currentPointCount = currentPointCount + 1
+    pointX(currentPointCount) = worldX - .5
+    pointY(currentPointCount) = worldY - .5
+    pointZ(currentPointCount) = worldZ - .5
+
+    currentPointCount = currentPointCount + 1
+    pointX(currentPointCount) = worldX + .5
+    pointY(currentPointCount) = worldY - .5
+    pointZ(currentPointCount) = worldZ - .5
+
+    currentPointCount = currentPointCount + 1
+    pointX(currentPointCount) = worldX + .5
+    pointY(currentPointCount) = worldY + .5
+    pointZ(currentPointCount) = worldZ - .5
+
+    currentPointCount = currentPointCount + 1
+    pointX(currentPointCount) = worldX - .5
+    pointY(currentPointCount) = worldY + .5
+    pointZ(currentPointCount) = worldZ - .5
+
+    currentPointCount = currentPointCount + 1
+    pointX(currentPointCount) = worldX - .5
+    pointY(currentPointCount) = worldY - .5
+    pointZ(currentPointCount) = worldZ + .5
+
+    currentPointCount = currentPointCount + 1
+    pointX(currentPointCount) = worldX + .5
+    pointY(currentPointCount) = worldY - .5
+    pointZ(currentPointCount) = worldZ + .5
+
+    currentPointCount = currentPointCount + 1
+    pointX(currentPointCount) = worldX + .5
+    pointY(currentPointCount) = worldY + .5
+    pointZ(currentPointCount) = worldZ + .5
+
+    currentPointCount = currentPointCount + 1
+    pointX(currentPointCount) = worldX - .5
+    pointY(currentPointCount) = worldY + .5
+    pointZ(currentPointCount) = worldZ + .5
+
+    ' Update cube positions and velocities
+    cubeX(cubeIndex) = worldX
+    cubeY(cubeIndex) = worldY
+    cubeZ(cubeIndex) = worldZ
+    cubeXSpeed(cubeIndex) = velocityX
+    cubeYSpeed(cubeIndex) = velocityY
+    cubeZSpeed(cubeIndex) = velocityZ
+NEXT cubeIndex
+
+END SUB
+
+SUB PlaceCubes
+
+' This subroutine initializes the positions and velocities of the cubes.
+scaleFactor = 1
+FOR cubeIndex = 1 TO cubeCount
+    cubeX(cubeIndex) = RND * 10 - 5
+    cubeY(cubeIndex) = 2
+    cubeZ(cubeIndex) = RND * 10 - 5
+    cubeXSpeed(cubeIndex) = (RND * .5 - .25) / scaleFactor
+    cubeYSpeed(cubeIndex) = (RND * .5 + .1) / scaleFactor
+    cubeZSpeed(cubeIndex) = (RND * .5 - .25) / scaleFactor
+NEXT cubeIndex
+
+END SUB
+
+SUB RenderScene
+' This subroutine renders the environment by projecting 3D points onto a 2D plane.
+' It applies rotation and perspective projection to create the anaglyph effect.
+
+sinAngle1 = SIN(rotationAngle1)
+cosAngle1 = COS(rotationAngle1)
+sinAngle2 = SIN(rotationAngle2)
+cosAngle2 = COS(rotationAngle2)
+
+' Project each 3D point to 2D screen coordinates
+FOR pointIndex = 1 TO currentPointCount
+    worldX = pointX(pointIndex) + cameraX
+    worldY = pointY(pointIndex) - cameraY
+    worldZ = pointZ(pointIndex) + cameraZ
+
+    ' First rotation around Y-axis (horizontal rotation)
+    rotatedX = worldX * sinAngle1 - worldZ * cosAngle1
+    rotatedZ = worldX * cosAngle1 + worldZ * sinAngle1
+
+    ' Second rotation around X-axis (vertical rotation)
+    rotatedY = worldY * sinAngle2 - rotatedZ * cosAngle2
+    depth = worldY * cosAngle2 + rotatedZ * sinAngle2
+
+    ' Apply perspective projection if point is in view
+    IF depth < .1 THEN
+        projectedX(pointIndex) = -1
+    ELSE
+        projectedX(pointIndex) = 160 + ((rotatedX + horizontalViewDistance) / depth * 200)
+        projectedXRight(pointIndex) = 160 + ((rotatedX - horizontalViewDistance) / depth * 200)
+        projectedY(pointIndex) = 100 - (rotatedY / depth * 200)
+    END IF
+NEXT pointIndex
+
+' Draw lines between projected points for left eye view
+FOR lineIndex = 1 TO currentLineCount
+    startPoint = lineStart(lineIndex)
+    endPoint = lineEnd(lineIndex)
+    IF projectedX(startPoint) = -1 OR projectedX(endPoint) = -1 THEN
+        ' Skip drawing if either point is out of view
+    ELSE
+        LINE (projectedX(startPoint), projectedY(startPoint))-(projectedX(endPoint), projectedY(endPoint)), 1
+    END IF
+NEXT lineIndex
+
+' Draw lines between projected points for right eye view
+FOR lineIndex = 1 TO currentLineCount
+    startPoint = lineStart(lineIndex)
+    endPoint = lineEnd(lineIndex)
+    IF projectedX(startPoint) = -1 OR projectedX(endPoint) = -1 THEN
+        ' Skip drawing if either point is out of view
+    ELSE
+        DrawLine INT(projectedXRight(startPoint)), INT(projectedY(startPoint)), INT(projectedXRight(endPoint)), INT(projectedY(endPoint))
+    END IF
+NEXT lineIndex
+
+END SUB
+
+SUB InitializeProgram
+SCREEN 7, , , 1
+
+OUT &H3C8, 0
+OUT &H3C9, 63
+OUT &H3C9, 63
+OUT &H3C9, 63
+
+OUT &H3C8, 1
+OUT &H3C9, 63
+OUT &H3C9, 0
+OUT &H3C9, 0
+
+OUT &H3C8, 2
+OUT &H3C9, 0
+OUT &H3C9, 63
+OUT &H3C9, 63
+
+OUT &H3C8, 3
+OUT &H3C9, 0
+OUT &H3C9, 0
+OUT &H3C9, 0
+
+originalPointCount = 0
+originalLineCount = 0
+currentPointCount = originalPointCount
+currentLineCount = originalLineCount
+cubeCount = 9
+
+cameraX = 0
+cameraY = 4
+cameraZ = 7
+rotationAngle1 = 3.14 / 2
+rotationAngle2 = rotationAngle1 + .6
+
+FOR pointIndex = 1 TO 1000
+    lineColor(pointIndex) = 4
+NEXT pointIndex
+
+FOR lineIndex = 1 TO 1000
+    originalLineStart(lineIndex) = 1
+    originalLineEnd(lineIndex) = 1
+NEXT lineIndex
+
+END SUB
diff --git a/3D GFX/Anaglyph.html b/3D GFX/Anaglyph.html
new file mode 100644
index 0000000..43346da
--- /dev/null
+++ b/3D GFX/Anaglyph.html	
@@ -0,0 +1,18 @@
+<HTML>
+<HEAD><TITLE>stereo vision</TITLE></HEAD>
+
+<BODY>
+
+<CENTER><H1>stereo vision</H1></CENTER>
+<BR>
+<BR>
+3D engine producing realtime stereo view. (ANAGLYPH)
+Conical grid with cubes flying around.
+You can freely fly around and adjust
+stereo view properties. Requires stereo glasses.
+
+<BR><IMG SRC="glasses-front.gif">
+
+<BR><IMG SRC="sshot.png">
+</BODY>
+</HTML>
\ No newline at end of file
diff --git a/3D GFX/Anaglyph.png b/3D GFX/Anaglyph.png
new file mode 100644
index 0000000..8f81825
Binary files /dev/null and b/3D GFX/Anaglyph.png differ
diff --git a/3D GFX/Helicopter/Helicopter.bas b/3D GFX/Helicopter/Helicopter.bas
new file mode 100644
index 0000000..d227cbc
--- /dev/null
+++ b/3D GFX/Helicopter/Helicopter.bas	
@@ -0,0 +1,1144 @@
+DECLARE SUB DisplayScene1 ()
+DECLARE SUB DisplayScene9 ()
+DECLARE SUB DisplayScene2 ()
+DECLARE SUB DisplayScene8 ()
+DECLARE SUB DisplayScene3 ()
+DECLARE SUB DisplayScene4 ()
+DECLARE SUB DisplayScene5 ()
+DECLARE SUB DisplayScene7 ()
+DECLARE SUB InitializeProgram ()
+DECLARE SUB DisplayScenePart1 ()
+DECLARE SUB DisplayScenePart2 ()
+DECLARE SUB DisplayScenePart3 ()
+DECLARE SUB DisplayScenePart4 ()
+DECLARE SUB DisplayScenePart5 ()
+DECLARE SUB DisplayScenePart6 ()
+DECLARE SUB DisplayScenePart7 ()
+DECLARE SUB DisplayScenePart8 ()
+DECLARE SUB DisplayScenePart10 ()
+DECLARE SUB DisplayScenePart9 ()
+DECLARE SUB DrawRoundedBox (topLeftX!, topLeftY!, bottomRightX!, bottomRightY!)
+DECLARE SUB ComputeShadeValue (firstPointX!, firstPointY!, firstPointZ!, secondPointX!, secondPointY!, secondPointZ!, thirdPointX!, thirdPointY!, thirdPointZ!, shadeValue!)
+DECLARE SUB GetAngle (firstPointX!, firstPointY!, secondPointX!, secondPointY!, angleBetween!)
+DECLARE SUB RotatePoint (centerX!, centerY!, pointX!, pointY!, rotationAngle!)
+DECLARE SUB FillPolygon (vertex1X!, vertex1Y!, vertex2X!, vertex2Y!, vertex3X!, vertex3Y!, fillColor!)
+DECLARE SUB InitializeFont ()
+DECLARE SUB WaitForInput ()
+DECLARE SUB MakeBackground ()
+DECLARE SUB SetPalette (red!, green!, blue!, colorIndex!)
+DECLARE SUB PrintText (posX!, posY!, scale!, colorValue!, textString$)
+
+' Presentation demonstrating realtime 3D graphics.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2025, Improved program readability
+
+DIM SHARED globalPiValue
+DIM SHARED globalPi
+DIM SHARED globalAngleOne
+DIM SHARED globalAngleTwo
+
+' Holds the captured font bitmap
+DIM SHARED fontData(0 TO 7, 0 TO 7, 32 TO 150)
+
+InitializeProgram
+DisplayScene1
+DisplayScene2
+DisplayScene3
+DisplayScene4
+DisplayScene7
+DisplayScene8
+
+
+SUB ComputeShadeValue (firstPointX, firstPointY, firstPointZ, secondPointX, secondPointY, secondPointZ, thirdPointX, thirdPointY, thirdPointZ, shadeValue)
+    '
+    ' Computes a brightness value for a 3D triangle based on distance from viewer.
+    ' The algorithm:
+    ' 1. Makes local copies of the three points
+    ' 2. Applies three sequential rotations to simulate 3D perspective
+    ' 3. Calculates distance from viewer to determine shading
+    '
+
+    ' Create local copies of the points
+    localFirstPointX = firstPointX
+    localFirstPointY = firstPointY
+    localFirstPointZ = firstPointZ
+    localSecondPointX = secondPointX
+    localSecondPointY = secondPointY
+    localSecondPointZ = secondPointZ
+    localThirdPointX = thirdPointX
+    localThirdPointY = thirdPointY
+    localThirdPointZ = thirdPointZ
+
+    ' First rotation around Y-axis
+    GetAngle localFirstPointX, localFirstPointY, localSecondPointX, localSecondPointY, tempAngle1
+    RotatePoint localFirstPointX, localFirstPointY, localSecondPointX, localSecondPointY, -tempAngle1
+    RotatePoint localFirstPointX, localFirstPointY, localThirdPointX, localThirdPointY, -tempAngle1
+
+    ' Second rotation around X-axis
+    GetAngle localFirstPointY, localFirstPointZ, localSecondPointY, localSecondPointZ, tempAngle2
+    tempAngle2 = tempAngle2 + globalPi / 2
+    RotatePoint localFirstPointY, localFirstPointZ, localSecondPointY, localSecondPointZ, -tempAngle2
+    RotatePoint localFirstPointY, localFirstPointZ, localThirdPointY, localThirdPointZ, -tempAngle2
+
+    ' Third rotation around Z-axis
+    GetAngle localFirstPointX, localFirstPointZ, localThirdPointX, localThirdPointZ, tempAngle3
+    tempAngle3 = tempAngle3 + globalPi / 2
+    RotatePoint localFirstPointX, localFirstPointZ, localSecondPointX, localSecondPointZ, -tempAngle3
+    RotatePoint localFirstPointX, localFirstPointZ, localThirdPointX, localThirdPointZ, -tempAngle3
+
+    ' Calculate distance from viewer to determine shading
+    viewerX = localFirstPointX
+    viewerY = localFirstPointY
+    viewerZ = localFirstPointZ + 30
+    RotatePoint localFirstPointX, localFirstPointZ, viewerX, viewerZ, tempAngle3
+    RotatePoint localFirstPointY, localFirstPointZ, viewerY, viewerZ, tempAngle2
+    RotatePoint localFirstPointX, localFirstPointY, viewerX, viewerY, tempAngle1
+
+    ' Compute distance from viewer to first point
+    distanceX = firstPointX + 20
+    distanceY = firstPointY + 10
+    distance = SQR((distanceX - viewerX) ^ 2 + (distanceY - viewerY) ^ 2)
+    shadeValue = 49 - distance
+    IF shadeValue < 0 THEN shadeValue = 0
+END SUB
+
+SUB DisplayScene1
+    '
+    ' Loads a 3D model from data.dat and demonstrates real-time rotation.
+    ' The model is projected to 2D and animated with a rotating effect.
+    '
+
+    SetPalette 0, 63, 20, 255
+    DIM modelVertexX(0 TO 1000)
+    DIM modelVertexY(0 TO 1000)
+    DIM modelVertexZ(0 TO 1000)
+    DIM projectedVertexX(0 TO 1000)
+    DIM projectedVertexY(0 TO 1000)
+    DIM lineStartVertex(0 TO 1500)
+    DIM lineEndVertex(0 TO 1500)
+    DIM oldLineStartX(1 TO 1500)
+    DIM oldLineStartY(1 TO 1500)
+    DIM oldLineEndX(1 TO 1500)
+    DIM oldLineEndY(1 TO 1500)
+    DIM totalVertices, totalLines
+    DIM rotationAngle1, rotationAngle2, rotationAngle3
+    DIM rotationSpeed1, rotationSpeed2, rotationSpeed3
+    DIM incrementVertices, incrementPolygons
+    DIM animationTime
+    DIM currentLines
+    DIM progressIndex
+
+    animationTime = 0
+    progressIndex = 1
+    rotationAngle1 = 0
+    rotationAngle2 = 0
+    totalVertices = -1
+    totalLines = 0
+    incrementVertices = 0
+    incrementPolygons = 0
+    currentLines = 0
+
+    SetPalette 40, 40, 40, 254
+    COLOR 254
+    LOCATE 2, 11
+    PRINT "One moment"
+
+    OPEN "data.dat" FOR INPUT AS #1
+    INPUT #1, incrementVertices
+    INPUT #1, incrementPolygons
+
+    FOR vertexIndex = 1 TO incrementVertices
+        INPUT #1, xVal, yVal, zVal
+        totalVertices = totalVertices + 1
+        modelVertexX(totalVertices) = xVal - 100
+        modelVertexY(totalVertices) = yVal
+        modelVertexZ(totalVertices) = zVal
+    NEXT vertexIndex
+
+    INPUT #1, lineVal1, lineVal2, lineVal3
+
+    FOR polygonIndex = 1 TO incrementPolygons - 1
+        INPUT #1, lineVal1!, lineVal2!, lineVal3!
+        newLineStart! = lineVal1!
+        newLineEnd! = lineVal2!
+        GOSUB AddLine
+        newLineStart! = lineVal2!
+        newLineEnd! = lineVal3!
+        GOSUB AddLine
+        newLineStart! = lineVal1!
+        newLineEnd! = lineVal3!
+        GOSUB AddLine
+        LOCATE 4, 10
+        PRINT STR$(INT(polygonIndex / (incrementPolygons - 1) * 100)) + "% ready"
+    NEXT polygonIndex
+
+    CLOSE 1
+    CLS
+
+RotateLoop:
+    animationTime = animationTime + 1
+    quitKey$ = INKEY$
+    IF quitKey$ = "q" THEN END
+
+    varA = COS(animationTime / 25)
+    rotationAngle1 = COS(animationTime / 29) * varA
+    rotationAngle2 = (globalPiValue / 2) + SIN(animationTime / 42) * varA
+    sin1 = SIN(rotationAngle1)
+    cos1 = COS(rotationAngle1)
+    sin2 = SIN(rotationAngle2)
+    cos2 = COS(rotationAngle2)
+
+    IF progressIndex >= 1 THEN
+        currentLines = currentLines + progressIndex
+        progressIndex = progressIndex + .03
+        IF currentLines > totalLines THEN currentLines = totalLines: progressIndex = 0
+    END IF
+
+    ' Project each 3D vertex to 2D
+    FOR vertexIndex = 0 TO totalVertices
+        x = modelVertexX(vertexIndex)
+        y = modelVertexY(vertexIndex)
+        z = modelVertexZ(vertexIndex)
+        zTemp = z * sin1 + y * cos1
+        yTemp = y * sin1 - z * cos1
+        zFinal = zTemp * sin2 + x * cos2
+        xFinal = x * sin2 - zTemp * cos2
+        zFinal = zFinal + 100
+        xFinal = xFinal / zFinal * 74 * 2
+        yFinal = yTemp / zFinal * 65 * 2
+        projectedVertexX(vertexIndex) = xFinal + 160
+        projectedVertexY(vertexIndex) = yFinal + 80
+    NEXT vertexIndex
+
+    ' Draw lines between vertices
+    FOR lineIndex = 1 TO currentLines
+        startVertex = lineStartVertex(lineIndex)
+        endVertex = lineEndVertex(lineIndex)
+        x1 = projectedVertexX(startVertex)
+        y1 = projectedVertexY(startVertex)
+        x2 = projectedVertexX(endVertex)
+        y2 = projectedVertexY(endVertex)
+        LINE (oldLineStartX(lineIndex), oldLineStartY(lineIndex))-(oldLineEndX(lineIndex), oldLineEndY(lineIndex)), 0
+        LINE (x1, y1)-(x2, y2), 255
+        oldLineStartX(lineIndex) = x1
+        oldLineStartY(lineIndex) = y1
+        oldLineEndX(lineIndex) = x2
+        oldLineEndY(lineIndex) = y2
+    NEXT lineIndex
+
+    SOUND 0, .5
+    IF animationTime < 280 THEN GOTO RotateLoop
+    GOTO EndScene
+
+AddLine:
+    FOR checkIndex = 1 TO totalLines
+        IF lineStartVertex(checkIndex) = newLineStart! THEN
+            IF lineEndVertex(checkIndex) = newLineEnd! THEN RETURN
+        END IF
+        IF lineStartVertex(checkIndex) = newLineEnd! THEN
+            IF lineEndVertex(checkIndex) = newLineStart! THEN RETURN
+        END IF
+    NEXT checkIndex
+
+    totalLines = totalLines + 1
+    lineStartVertex(totalLines) = newLineStart!
+    lineEndVertex(totalLines) = newLineEnd!
+    RETURN
+
+EndScene:
+    globalAngleOne = rotationAngle1
+    globalAngleTwo = rotationAngle2
+END SUB
+
+SUB DisplayScene2
+    '
+    ' Loads human face 3D model "data.dat" and projects triangular faces in 2D.
+    ' Each triangle's average depth is computed, and polygons are drawn
+    ' from back to front with FillPolygon. The shading is computed too.
+    '
+
+    SetPalette 0, 63, 20, 255
+    CLS
+    globalAngleOne = 0
+    globalAngleTwo = 1.5
+    DIM pointX(0 TO 2000)
+    DIM pointY(0 TO 2000)
+    DIM pointZ(0 TO 2000)
+    DIM rotatedX(0 TO 2000)
+    DIM rotatedY(0 TO 2000)
+    DIM rotatedZ(0 TO 2000)
+    DIM polyVertex1(1 TO 2000)
+    DIM polyVertex2(1 TO 2000)
+    DIM polyVertex3(1 TO 2000)
+    numPoints = 0
+    numTriangles = 0
+
+    OPEN "data.dat" FOR INPUT AS #1
+    INPUT #1, totalPoints
+    INPUT #1, totalPolys
+
+    FOR loopIndex = 1 TO totalPoints
+        INPUT #1, posXVal, posYVal, posZVal
+        pointX(numPoints) = posXVal - 100
+        pointY(numPoints) = posYVal
+        pointZ(numPoints) = posZVal
+        numPoints = numPoints + 1
+    NEXT loopIndex
+
+    INPUT #1, lineValA, lineValB, lineValC
+
+    FOR loopIndex = 1 TO totalPolys - 1
+        INPUT #1, lineValA, lineValB, lineValC
+        numTriangles = numTriangles + 1
+        polyVertex1(numTriangles) = lineValA
+        polyVertex2(numTriangles) = lineValB
+        polyVertex3(numTriangles) = lineValC
+    NEXT loopIndex
+
+    CLOSE #1
+
+    sin1 = SIN(globalAngleOne)
+    cos1 = COS(globalAngleOne)
+    sin2 = SIN(globalAngleTwo)
+    cos2 = COS(globalAngleTwo)
+
+    ' Project each 3D point
+    FOR loopIndex = 0 TO numPoints
+        localX = pointX(loopIndex)
+        localY = pointY(loopIndex)
+        localZ = pointZ(loopIndex)
+        zTmp = localZ * sin1 + localY * cos1
+        yTmp = localY * sin1 - localZ * cos1
+        zFin = zTmp * sin2 + localX * cos2
+        xFin = localX * sin2 - zTmp * cos2
+        zFin = zFin + 100
+        xFin = xFin / zFin * 74 * 2
+        yFin = yTmp / zFin * 65 * 2
+        rotatedX(loopIndex) = xFin + 160
+        rotatedY(loopIndex) = yFin + 80
+        rotatedZ(loopIndex) = zFin
+    NEXT loopIndex
+
+    ' Adjust palette for shading
+    FOR loopIndex = 1 TO 49
+        SetPalette loopIndex * 1.1 + 20, loopIndex * 1.1 + 10, loopIndex * 1.1, loopIndex
+    NEXT loopIndex
+
+    DIM polyDepth(1 TO numTriangles)
+
+    FOR loopIndex = 1 TO numTriangles
+        polyDepth(loopIndex) = (rotatedZ(polyVertex1(loopIndex)) + rotatedZ(polyVertex2(loopIndex)) + rotatedZ(polyVertex3(loopIndex)))
+    NEXT loopIndex
+
+    endIndex = numTriangles
+
+    ' Sort by descending depth (z)
+    FOR loopIndex = 1 TO numTriangles
+        bigVal = -10000
+        bigIndex = 1
+        FOR checkIdx = 1 TO endIndex
+            IF polyDepth(checkIdx) > bigVal THEN
+                bigVal = polyDepth(checkIdx)
+                bigIndex = checkIdx
+            END IF
+        NEXT checkIdx
+
+        vertexA = polyVertex1(bigIndex)
+        vertexB = polyVertex2(bigIndex)
+        vertexC = polyVertex3(bigIndex)
+        polyDepth(bigIndex) = polyDepth(endIndex)
+        polyVertex1(bigIndex) = polyVertex1(endIndex)
+        polyVertex2(bigIndex) = polyVertex2(endIndex)
+        polyVertex3(bigIndex) = polyVertex3(endIndex)
+        endIndex = endIndex - 1
+
+        ComputeShadeValue rotatedX(vertexA), rotatedY(vertexA), rotatedZ(vertexA), rotatedX(vertexB), rotatedY(vertexB), rotatedZ(vertexB), rotatedX(vertexC), rotatedY(vertexC), rotatedZ(vertexC), shadeVal
+
+        FillPolygon INT(rotatedX(vertexA)), INT(rotatedY(vertexA)), INT(rotatedX(vertexB)), INT(rotatedY(vertexB)), INT(rotatedX(vertexC)), INT(rotatedY(vertexC)), INT(shadeVal)
+    NEXT loopIndex
+
+' Delay before proceeding to next scene
+    FOR loopIndex = 1 TO 20
+        SOUND 0, 1
+    NEXT loopIndex
+
+END SUB
+
+SUB DisplayScene3
+    '
+    ' Demonstrates simple raster/wave effects by copying screen slices,
+    ' does some random shifting, then shows text with circles around the bits.
+    '
+
+    DIM bufferArray(1 TO 10000)
+    DIM waveArray(0 TO 35)
+
+
+    ' Build a wave-like boundary in waveArray()
+    FOR loopIndex = 0 TO 30
+        IF loopIndex <= 5 THEN waveArray(loopIndex) = 120 + (SQR((20 - loopIndex) * loopIndex))
+        IF (loopIndex > 5) AND (loopIndex < 25) THEN waveArray(loopIndex) = 120 + 10
+        IF loopIndex >= 25 THEN waveArray(loopIndex) = 120 + (SQR((30 - loopIndex) * (loopIndex - 10)))
+    NEXT loopIndex
+
+    ' Slide the screen upward in small blocks
+    FOR screenY = 0 TO 30
+        FOR screenX = 10 TO 300 STEP 10
+            GET (screenX, 0)-(screenX + 9, 198), bufferArray(1)
+            PUT (screenX, 1), bufferArray(1), PSET
+        NEXT screenX
+
+        ' Slight color shift
+        FOR colorIx = 1 TO 49
+            SetPalette colorIx * 1.1 + (20 - screenY), colorIx * 1.1 + 10 + (screenY / 1.5), colorIx * 1.1, colorIx
+        NEXT colorIx
+
+        SOUND 0, 1
+        LINE (160 - waveArray(screenY), 20)-(160 + waveArray(screenY), 20), 255
+    NEXT screenY
+
+    LOCATE 1, 1
+    COLOR 254
+    SetPalette 0, 0, 0, 254
+    PRINT "Test 123456789"
+    SetPalette 63, 0, 0, 253
+
+    ' Draw circles around the nonzero pixels of the printed text
+    FOR rowY = 0 TO 8
+        FOR rowX = 0 TO 120
+            pixelVal = POINT(rowX, rowY)
+            IF pixelVal > 0 THEN CIRCLE (rowX * 2 + 50, rowY * 3 + 26), 2, 0
+        NEXT rowX
+
+        FOR rowX = 0 TO 120
+            pixelVal = POINT(rowX, rowY + 1)
+            IF pixelVal > 0 THEN CIRCLE (rowX * 2 + 50, (rowY + 1) * 3 + 26), 2, 253
+        NEXT rowX
+
+        SOUND 0, 2
+    NEXT rowY
+
+    RANDOMIZE 1
+
+    ' Perform random screen shifts
+    FOR loopIndex = 1 TO 10
+        randY = RND * 100 + 50
+        FOR screenX = 10 TO 300 STEP 10
+            GET (screenX, randY)-(screenX + 9, 198), bufferArray(1)
+            PUT (screenX, randY - 1), bufferArray(1), PSET
+        NEXT screenX
+    NEXT loopIndex
+
+    COLOR 253
+    SetPalette 0, 0, 0, 253
+    LOCATE 1
+    PRINT " Author:  Svjatoslav Agejenko 30.09.2001 "
+
+    GET (0, 0)-(319, 8), bufferArray(1)
+    LOCATE 1
+    PRINT "                                        "
+    PUT (0, 190), bufferArray(1), PSET
+
+    FOR loopIndex = 1 TO 32
+        SetPalette 0, loopIndex, loopIndex * 2, 253
+        SOUND 0, 1
+    NEXT loopIndex
+
+    WaitForInput
+END SUB
+
+SUB DisplayScene4
+    '
+    ' Builds a fractal backdrop, prints short text lines
+   
+    RANDOMIZE 1
+    MakeBackground
+    DrawRoundedBox 30, 50, 290, 150
+    SetPalette 32, 64, 32, 250
+    yOffset = 0
+    PrintText 30, 70 + yOffset, 1, 250, "Next will be animated helicopter."
+    yOffset = yOffset + 16
+    PrintText 30, 70 + yOffset, 1, 250, "Helicopter chooses and picks up"
+    yOffset = yOffset + 20
+    PrintText 30, 70 + yOffset, 1, 250, "random pyramids. Press any key"
+    yOffset = yOffset + 16
+    PrintText 30, 70 + yOffset, 1, 250, "to proceed to next slide."
+    WaitForInput
+END SUB
+
+SUB DisplayScene7
+    '
+    ' Simple transitional effect: draws horizontal lines across the screen
+    ' in steps, clearing or darkening each row to black.
+    '
+
+    SetPalette 0, 0, 0, 0
+    FOR outerIndex = 0 TO 19
+        FOR drawY = outerIndex TO 199 STEP 20
+            LINE (0, drawY)-(319, drawY), 0
+        NEXT drawY
+        SOUND 0, .5
+    NEXT outerIndex
+END SUB
+
+SUB DisplayScene8
+    '
+    ' A more complex 3D scene:
+    ' Terrain with various heights.
+    ' Helicopter hovers over terrain.
+    ' Helicopter randomly chooses small pyramids that are scattered around terrain,
+    ' flies to pyramids and picks them up one-by-one.
+    ' Press any key to transition to next slide.
+
+    FOR fadeIndex = 1 TO 50
+        SetPalette 0, 0, 0, fadeIndex
+    NEXT fadeIndex
+
+    DIM mainX(0 TO 800)
+    DIM mainY(0 TO 800)
+    DIM mainZ(0 TO 800)
+    DIM lineStart(0 TO 1000)
+    DIM lineEnd(0 TO 1000)
+    DIM lineColor(0 TO 1000)
+    DIM lineBufferXOne(1 TO 1000)
+    DIM lineBufferYOne(1 TO 1000)
+    DIM lineBufferXTwo(1 TO 1000)
+    DIM lineBufferYTwo(1 TO 1000)
+    DIM projectedX(0 TO 800)
+    DIM projectedY(0 TO 800)
+    DIM holdX(1 TO 50)
+    DIM holdY(1 TO 50)
+    DIM holdZ(1 TO 50)
+    DIM helicopterAngle
+    DIM helicopterRotorAngle
+    DIM holdNumber
+    DIM helicopterPointer
+    DIM holdAx, holdAy, holdAz
+    DIM moveX, moveZ, moveY
+    DIM destinationX, destinationZ
+    DIM destinationAngle
+    DIM totalPoints, totalLines
+    DIM angleOne, angleTwo
+    DIM timeCounter
+    DIM incVal
+    DIM miniCount
+    DIM minutesVal
+
+    minutesVal = 0
+    miniCount = 25
+    timeCounter = 0
+    incVal = 1
+    angleOne = 0
+    angleTwo = 0
+    totalPoints = 0
+    totalLines = 0
+
+    RANDOMIZE 100
+    blockSize = 64
+
+FractalSubLoop:
+    halfBlock = blockSize / 2
+    FOR rowY = 0 TO 100 STEP blockSize
+        FOR rowX = 0 TO 100 STEP blockSize
+            color1 = POINT(rowX, rowY)
+            color2 = POINT(rowX + blockSize, rowY)
+            color3 = POINT(rowX, rowY + blockSize)
+            color4 = POINT(rowX + blockSize, rowY + blockSize)
+            color5 = (color1 + color2 + color3 + color4) / 4 + RND * blockSize * 6 - halfBlock * 7
+            color6 = (color2 + color4) / 2 + RND * blockSize * 6 - halfBlock * 7
+            color7 = (color3 + color4) / 2 + RND * blockSize * 6 - halfBlock * 7
+
+            IF color5 > 50 THEN color5 = 50
+            IF color5 < 0 THEN color5 = 0
+            IF color6 > 50 THEN color6 = 50
+            IF color6 < 0 THEN color6 = 0
+            IF color7 > 50 THEN color7 = 50
+            IF color7 < 0 THEN color7 = 0
+
+            PSET (rowX + halfBlock, rowY + halfBlock), color5
+            PSET (rowX + blockSize, rowY + halfBlock), color6
+            PSET (rowX + halfBlock, rowY + blockSize), color7
+        NEXT rowX
+    NEXT rowY
+
+    blockSize = blockSize / 2
+    IF blockSize > 1 THEN GOTO FractalSubLoop
+
+    ' Build mesh points in mainX(), mainY(), mainZ()
+    FOR zLoop = 1 TO 400 STEP 20
+        FOR xLoop = 1 TO 400 STEP 20
+            totalPoints = totalPoints + 1
+            mainX(totalPoints) = xLoop
+            mainY(totalPoints) = POINT(zLoop / 20 + 10, xLoop / 20 + 10) * 2
+            mainZ(totalPoints) = zLoop
+
+            IF xLoop > 1 THEN
+                totalLines = totalLines + 1
+                lineStart(totalLines) = totalPoints
+                lineEnd(totalLines) = totalPoints - 1
+                lineColor(totalLines) = 1
+            END IF
+
+            IF zLoop > 1 THEN
+                totalLines = totalLines + 1
+                lineStart(totalLines) = totalPoints
+                lineEnd(totalLines) = totalPoints - 20
+                lineColor(totalLines) = 1
+            END IF
+        NEXT xLoop
+    NEXT zLoop
+
+    LINE (0, 0)-(319, 199), 0, BF
+    SetPalette 0, 0, 0, 0
+    SetPalette 0, 40, 10, 1
+    SetPalette 0, 32, 64, 2
+    SetPalette 50, 50, 0, 3
+    SetPalette 64, 20, 0, 4
+
+    moveX = 200
+    moveZ = 200
+    distanceScale = 1000
+    holdAx = 200
+    holdAy = 0
+    holdAz = 200
+    destinationX = 200
+    destinationZ = 200
+
+    ' Load helicopter model
+    OPEN "data2.dat" FOR INPUT AS #1
+    indexA = 0
+    indexB = 0
+    helicopterPointer = totalPoints + 1
+
+ReadLoop:
+    INPUT #1, fileX, fileY, fileZ
+    IF fileX = 999 THEN GOTO CheckLines
+    indexA = indexA + 1
+    holdX(indexA) = fileX
+    holdY(indexA) = -fileY
+    holdZ(indexA) = fileZ
+    GOTO ReadLoop
+
+CheckLines:
+    INPUT #1, readA, readB
+    IF readA = 999 THEN GOTO CloseData
+    totalLines = totalLines + 1
+    lineStart(totalLines) = readA + totalPoints + 1
+    lineEnd(totalLines) = readB + totalPoints + 1
+    lineColor(totalLines) = 2
+    GOTO CheckLines
+
+CloseData:
+    CLOSE #1
+    totalPoints = totalPoints + indexA
+    holdNumber = indexA
+
+    RANDOMIZE 10
+    colorVal = 3
+
+    FOR indexA = 1 TO 25
+        randPick = RND * 396 + 2
+        xBox = mainX(randPick)
+        zBox = mainZ(randPick)
+        yBox = mainY(randPick) - 4
+
+        mainX(totalPoints + 1) = xBox - 5
+        mainY(totalPoints + 1) = yBox
+        mainZ(totalPoints + 1) = zBox - 5
+        mainX(totalPoints + 2) = xBox + 5
+        mainY(totalPoints + 2) = yBox
+        mainZ(totalPoints + 2) = zBox - 5
+        mainX(totalPoints + 3) = xBox + 5
+        mainY(totalPoints + 3) = yBox
+        mainZ(totalPoints + 3) = zBox + 5
+        mainX(totalPoints + 4) = xBox - 5
+        mainY(totalPoints + 4) = yBox
+        mainZ(totalPoints + 4) = zBox + 5
+        mainX(totalPoints + 5) = xBox
+        mainY(totalPoints + 5) = yBox - 5
+        mainZ(totalPoints + 5) = zBox
+
+        lineStart(totalLines + 1) = totalPoints + 1
+        lineEnd(totalLines + 1) = totalPoints + 2
+        lineColor(totalLines + 1) = colorVal
+        lineStart(totalLines + 2) = totalPoints + 2
+        lineEnd(totalLines + 2) = totalPoints + 3
+        lineColor(totalLines + 2) = colorVal
+        lineStart(totalLines + 3) = totalPoints + 3
+        lineEnd(totalLines + 3) = totalPoints + 4
+        lineColor(totalLines + 3) = colorVal
+        lineStart(totalLines + 4) = totalPoints + 4
+        lineEnd(totalLines + 4) = totalPoints + 1
+        lineColor(totalLines + 4) = colorVal
+        lineStart(totalLines + 5) = totalPoints + 1
+        lineEnd(totalLines + 5) = totalPoints + 5
+        lineColor(totalLines + 5) = colorVal
+        lineStart(totalLines + 6) = totalPoints + 2
+        lineEnd(totalLines + 6) = totalPoints + 5
+        lineColor(totalLines + 6) = colorVal
+        lineStart(totalLines + 7) = totalPoints + 3
+        lineEnd(totalLines + 7) = totalPoints + 5
+        lineColor(totalLines + 7) = colorVal
+        lineStart(totalLines + 8) = totalPoints + 4
+        lineEnd(totalLines + 8) = totalPoints + 5
+        lineColor(totalLines + 8) = colorVal
+
+        totalPoints = totalPoints + 5
+        totalLines = totalLines + 8
+    NEXT indexA
+
+MainLoop:
+    SOUND 0, 1
+    IF INKEY$ <> "" THEN minutesVal = 1
+    IF minutesVal > 150 THEN GOTO FinalArea
+    IF minutesVal <> 0 THEN minutesVal = minutesVal + 7
+
+    moveX = holdAx
+    moveY = 50 - holdAy - minutesVal
+    moveZ = holdAz
+
+    SELECT CASE incVal
+        CASE 1
+            destinationX = mainX(totalPoints)
+            destinationZ = mainZ(totalPoints)
+            GetAngle destinationX, destinationZ, holdAx, holdAz, destinationAngle
+
+            IF destinationAngle - helicopterAngle > globalPi THEN destinationAngle = destinationAngle - (globalPi * 2)
+            IF helicopterAngle - destinationAngle > globalPi THEN destinationAngle = destinationAngle + (globalPi * 2)
+
+            incVal = 2
+
+            FOR indexA = totalLines - 7 TO totalLines
+                lineColor(indexA) = 4
+            NEXT indexA
+
+        CASE 2
+            angleDiff = destinationAngle - helicopterAngle
+            IF destinationAngle = helicopterAngle THEN incVal = 3
+            IF angleDiff > .05 THEN angleDiff = .05
+            IF angleDiff < -.05 THEN angleDiff = -.05
+            helicopterAngle = helicopterAngle + angleDiff
+
+        CASE 3
+            diffX = destinationX - holdAx
+            diffZ = destinationZ - holdAz
+            distVal = SQR(diffX * diffX + diffZ * diffZ)
+            IF distVal < 5 THEN incVal = 4
+            distVal = distVal / 2
+            holdAx = holdAx + diffX / distVal
+            holdAz = holdAz + diffZ / distVal
+
+        CASE 4
+            FOR indexA = totalPoints - 4 TO totalPoints
+                mainY(indexA) = mainY(indexA) - 1
+            NEXT indexA
+
+            IF mainY(totalPoints) < 3 - holdAy THEN
+                FOR indexA = totalLines - 7 TO totalLines
+                    LINE (lineBufferXOne(indexA), lineBufferYOne(indexA))-(lineBufferXTwo(indexA), lineBufferYTwo(indexA)), 0
+                NEXT indexA
+
+                totalPoints = totalPoints - 5
+                totalLines = totalLines - 8
+                miniCount = miniCount - 1
+                incVal = 6
+
+                IF miniCount <= 0 THEN incVal = 7
+            END IF
+
+        CASE 6
+            incVal = 5
+
+        CASE 5
+            incVal = 1
+    END SELECT
+
+
+    ' Place helicopter on the scene
+    localYVal = 60 - mainY(INT((holdAz + 10) / 20) * 20 + INT((holdAx + 10) / 20))
+
+    IF holdAy > localYVal + 5 THEN holdAy = holdAy - 1
+    IF holdAy < localYVal THEN holdAy = holdAy + 1
+    IF holdAy > localYVal + 25 THEN holdAy = holdAy - 1
+    IF holdAy < localYVal - 20 THEN holdAy = holdAy + 1
+
+    sinVal = SIN(helicopterAngle)
+    cosVal = COS(helicopterAngle)
+
+    FOR indexA = 0 TO holdNumber - 5
+        tempX = holdX(indexA + 1)
+        tempZ = holdZ(indexA + 1)
+        mainX(indexA + helicopterPointer) = tempX * sinVal + tempZ * cosVal + holdAx
+        mainY(indexA + helicopterPointer) = holdY(indexA + 1) - holdAy
+        mainZ(indexA + helicopterPointer) = tempZ * sinVal - tempX * cosVal + holdAz
+    NEXT indexA
+
+    ' Rotate helicopter rotor
+    helicopterRotorAngle = helicopterRotorAngle + .5
+    sinVal = SIN(helicopterRotorAngle)
+    cosVal = COS(helicopterRotorAngle)
+
+    FOR indexA = holdNumber - 4 TO holdNumber - 1
+        tempX = holdX(indexA + 1)
+        tempZ = holdZ(indexA + 1)
+        mainX(indexA + helicopterPointer) = tempX * sinVal + tempZ * cosVal + holdAx
+        mainY(indexA + helicopterPointer) = holdY(indexA + 1) - holdAy
+        mainZ(indexA + helicopterPointer) = tempZ * sinVal - tempX * cosVal + holdAz
+    NEXT indexA
+
+    timeCounter = timeCounter + 1
+    angleOne = angleOne + SIN(timeCounter / 100) / 20
+    angleTwo = SIN(timeCounter / 42) * .3 + 1.15
+    sin1 = SIN(angleOne)
+    cos1 = COS(angleOne)
+    sin2 = SIN(angleTwo)
+    cos2 = COS(angleTwo)
+
+    ' Project all points to 2D
+    FOR indexA = 0 TO totalPoints
+        shiftX = mainX(indexA) - moveX
+        shiftY = mainY(indexA) - moveY
+        shiftZ = mainZ(indexA) - moveZ
+        zIntermediate = shiftZ * sin1 + shiftX * cos1
+        xIntermediate = shiftX * sin1 - shiftZ * cos1
+        zProject = zIntermediate * sin2 + shiftY * cos2
+        yProject = shiftY * sin2 - zIntermediate * cos2
+        zProject = zProject + distanceScale
+
+        IF zProject < 1 THEN projectedX(indexA) = -1: GOTO Skip2D
+
+        xProject = xIntermediate / zProject * 74 * 2
+        yProject = yProject / zProject * 65 * 2
+        projectedX(indexA) = xProject + 160
+        projectedY(indexA) = yProject + 80
+
+Skip2D:
+    NEXT indexA
+
+    ' Erase old lines and draw new ones
+    FOR indexA = 1 TO totalLines
+        startIndex = lineStart(indexA)
+        endIndex = lineEnd(indexA)
+        x1Temp = projectedX(startIndex)
+        x2Temp = projectedX(endIndex)
+        LINE (lineBufferXOne(indexA), lineBufferYOne(indexA))-(lineBufferXTwo(indexA), lineBufferYTwo(indexA)), 0
+
+        IF (x1Temp = -1) OR (x2Temp = -1) THEN GOTO SkipDrawing
+
+        y1Temp = projectedY(startIndex)
+        y2Temp = projectedY(endIndex)
+        LINE (x1Temp, y1Temp)-(x2Temp, y2Temp), lineColor(indexA)
+        lineBufferXOne(indexA) = x1Temp
+        lineBufferYOne(indexA) = y1Temp
+        lineBufferXTwo(indexA) = x2Temp
+        lineBufferYTwo(indexA) = y2Temp
+
+SkipDrawing:
+    NEXT indexA
+
+    IF distanceScale > 200 THEN distanceScale = distanceScale - 10
+    IF timeCounter < 28000 THEN GOTO MainLoop
+
+FinalArea:
+END SUB
+
+SUB DrawRoundedBox (topLeftX, topLeftY, bottomRightX, bottomRightY)
+    '
+    ' Draws a soft-edged rectangular box by fading pixel colors around its edges.
+    ' This creates a gentle "rounded" or "blurred" border appearance.
+    '
+
+    FOR currentY = topLeftY TO bottomRightY
+        fadeSize = 10
+        ' Fade in the upper boundary region
+        IF currentY - topLeftY <= 10 THEN
+            fadeSize = (SQR((20 - (currentY - topLeftY)) * (currentY - topLeftY)))
+        END IF
+        ' Fade in the lower boundary region
+        IF bottomRightY - currentY <= 10 THEN
+            fadeSize = (SQR((20 - (bottomRightY - currentY)) * (bottomRightY - currentY)))
+        END IF
+        FOR currentX = topLeftX - fadeSize TO bottomRightX + fadeSize
+            colorVal = POINT(currentX, currentY)
+            IF colorVal <= 127 THEN
+                colorVal = colorVal + 127
+                IF colorVal > 245 THEN colorVal = 245
+                PSET (currentX, currentY), colorVal
+            END IF
+        NEXT currentX
+    NEXT currentY
+END SUB
+
+SUB FillPolygon (vertex1X, vertex1Y, vertex2X, vertex2Y, vertex3X, vertex3Y, fillColor)
+    '
+    ' Fills a triangular area using a scanline algorithm.
+    ' 1. Finds intersection points between edges and horizontal scanlines
+    ' 2. Draws horizontal lines between pairs of intersections
+    '
+
+    DIM scanIntersection(-100 TO 300)
+    startX = vertex1X
+    startY = vertex1Y
+    endX = vertex2X
+    endY = vertex2Y
+    GOSUB DrawEdges
+    startX = vertex1X
+    startY = vertex1Y
+    endX = vertex3X
+    endY = vertex3Y
+    GOSUB DrawEdges
+    startX = vertex3X
+    startY = vertex3Y
+    endX = vertex2X
+    endY = vertex2Y
+    GOSUB DrawEdges
+    GOTO FinishPolygon
+
+DrawEdges:
+    ' Swap points if needed to ensure we draw from top to bottom
+    IF endY < startY THEN
+        SWAP startY, endY
+        SWAP startX, endX
+    END IF
+    ' For each scanline between the two points
+    FOR scanY = startY TO endY - 1
+        ' Calculate x position along the edge
+        scanX = startX + (endX - startX) * ((scanY - startY) / (endY - startY))
+        ' Store first intersection point
+        IF scanIntersection(scanY) = 0 THEN
+            scanIntersection(scanY) = scanX
+        ELSE
+            ' Draw horizontal line between intersections
+            LINE (scanX, scanY)-(scanIntersection(scanY), scanY), fillColor
+        END IF
+    NEXT scanY
+    RETURN
+
+FinishPolygon:
+END SUB
+
+SUB GetAngle (firstPointX, firstPointY, secondPointX, secondPointY, angleBetween)
+    '
+    ' Calculates the angle between two 2D points in radians.
+    ' Used for rotation calculations in 3D rendering.
+    '
+
+    IF firstPointY = secondPointY THEN
+        IF secondPointX > firstPointX THEN
+            angleBetween = globalPi / 2
+        ELSE
+            angleBetween = globalPi * 1.5
+        END IF
+        GOTO SkipSpecialCases
+    END IF
+
+    IF secondPointY > firstPointY THEN
+        IF secondPointX = firstPointX THEN
+            angleBetween = globalPi
+            GOTO SkipSpecialCases
+        END IF
+        IF secondPointX > firstPointX THEN
+            angleBetween = (globalPi * 1) - ATN((secondPointX - firstPointX) / (secondPointY - firstPointY))
+        ELSE
+            angleBetween = globalPi + ATN((firstPointX - secondPointX) / (secondPointY - firstPointY))
+        END IF
+    ELSE
+        IF secondPointX = firstPointX THEN
+            angleBetween = 0
+            GOTO SkipSpecialCases
+        END IF
+        IF secondPointX > firstPointX THEN
+            angleBetween = ATN((secondPointX - firstPointX) / (firstPointY - secondPointY))
+        ELSE
+            angleBetween = globalPi * 2 - ATN((firstPointX - secondPointX) / (firstPointY - secondPointY))
+        END IF
+    END IF
+
+SkipSpecialCases:
+END SUB
+
+SUB InitializeFont
+    '
+    ' Captures the current text font into fontData() for later use in PrintText.
+    ' This is done by printing each ASCII character (32..150) and reading its bits.
+    '
+
+    SetPalette 0, 0, 0, 70
+    COLOR 70
+    FOR asciiCode = 32 TO 150
+        LOCATE 1, 1
+        PRINT CHR$(asciiCode);
+        FOR rowY = 0 TO 7
+            FOR rowX = 0 TO 7
+                fontData(rowX, rowY, asciiCode) = POINT(rowX, rowY)
+            NEXT rowX
+        NEXT rowY
+    NEXT asciiCode
+END SUB
+
+SUB InitializeProgram
+    '
+    ' Initializes the environment:
+    '  1) Switches to SCREEN 13
+    '  2) Sets globalPi and globalPiI
+    '  3) Calculates a shared factor (fac) for angles
+    '  4) Calls InitializeFont to capture system font data
+    '
+
+    SCREEN 13
+    globalPi = 3.141592
+    globalPiValue = globalPi
+    angleFactor = 360 / (globalPi * 2)
+    InitializeFont
+END SUB
+
+DEFINT A-Z
+SUB MakeBackground
+    '
+    ' Creates a fractal-like landscape in the background by iteratively sampling
+    ' and perturbing pixel values. The result is a random terrain effect.
+    '
+
+    CLS
+    SetPalette 0, 5, 5, 250
+    SetPalette 0, 5, 5, 251
+    SetPalette 0, 5, 5, 252
+    SetPalette 0, 5, 5, 253
+    SetPalette 0, 5, 5, 254
+    SetPalette 0, 5, 5, 255
+
+    ' Set custom RGB values for palette entries 0..127
+    FOR colorIndex = 0 TO 127
+        OUT &H3C8, colorIndex
+        OUT &H3C9, SIN(colorIndex / 22) * 30 + 30
+        OUT &H3C9, SIN(colorIndex / 18) * 5 + 5
+        OUT &H3C9, COS(colorIndex / 12) * 10 + 10
+    NEXT colorIndex
+
+    ' Palette entries 128..245
+    FOR colorIndex = 128 TO 245
+        OUT &H3C8, colorIndex
+        offsetIndex = colorIndex - 128
+        OUT &H3C9, SIN(offsetIndex / 22) * 4 + 10
+        OUT &H3C9, SIN(offsetIndex / 18) * 4 + 10
+        OUT &H3C9, COS(offsetIndex / 12) * 4 + 10
+    NEXT colorIndex
+
+    maxValue = 127
+    blockSize = 2 ^ 8
+
+FractalLoop:
+    blockSize = blockSize \ 2
+    numXSteps = (319 \ blockSize) - 1
+    numYSteps = (199 \ blockSize) - 1
+
+    ' Subdivide squares in the image to add random variations
+    FOR rowY = 0 TO numYSteps
+        FOR rowX = 0 TO numXSteps
+            topLeftX = rowX * blockSize
+            topLeftY = rowY * blockSize
+            topLeftColor = POINT(topLeftX, topLeftY)
+            topRightColor = POINT(topLeftX + blockSize, topLeftY)
+            bottomLeftColor = POINT(topLeftX, topLeftY + blockSize)
+            bottomRightColor = POINT(topLeftX + blockSize, topLeftY + blockSize)
+
+            midTopColor = ((topLeftColor + topRightColor) / 2) + (RND * 6) - 3
+            IF midTopColor > maxValue THEN midTopColor = maxValue
+
+            midLeftColor = ((topLeftColor + bottomLeftColor) / 2) + (RND * 6) - 3
+            IF midLeftColor > maxValue THEN midLeftColor = maxValue
+
+            midRightColor = ((topRightColor + bottomRightColor) / 2) + (RND * 6) - 3
+            IF midRightColor > maxValue THEN midRightColor = maxValue
+
+            midBottomColor = ((bottomLeftColor + bottomRightColor) / 2) + (RND * 6) - 3
+            IF midBottomColor > maxValue THEN midBottomColor = maxValue
+
+            centerColor = ((midTopColor + midLeftColor + midRightColor + midBottomColor) / 4) + (RND * 6) - 3
+            IF centerColor > maxValue THEN centerColor = maxValue
+
+            PSET (topLeftX + blockSize / 2, topLeftY + blockSize / 2), centerColor
+            PSET (topLeftX + blockSize / 2, topLeftY), midTopColor
+            PSET (topLeftX, topLeftY + blockSize / 2), midLeftColor
+            PSET (topLeftX + blockSize, topLeftY + blockSize / 2), midRightColor
+            PSET (topLeftX + blockSize / 2, topLeftY + blockSize), midBottomColor
+        NEXT rowX
+    NEXT rowY
+
+    IF blockSize > 2 THEN GOTO FractalLoop
+END SUB
+
+DEFSNG A-Z
+SUB PrintText (posX, posY, scale, colorValue, textString$)
+    '
+    ' Renders text at (posX, posY) using the captured fontData().
+    ' Currently supports scale=1 for normal size. If scale=1, each character
+    ' is drawn 1:1 from the font data.
+    '
+
+    IF scale = 1 THEN
+        currentX = posX
+        FOR charIndex = 1 TO LEN(textString$)
+            asciiVal = ASC(RIGHT$(LEFT$(textString$, charIndex), 1))
+            IF asciiVal > 150 OR asciiVal < 32 THEN GOTO SkipCharacter
+            FOR rowY = 0 TO 7
+                FOR rowX = 0 TO 7
+                    pixelVal = fontData(rowX, rowY, asciiVal)
+                    IF pixelVal > 0 THEN PSET (rowX + currentX, rowY + posY), colorValue
+                NEXT rowX
+            NEXT rowY
+SkipCharacter:
+            currentX = currentX + 8
+        NEXT charIndex
+    END IF
+END SUB
+
+SUB RotatePoint (rotationCenterX, rotationCenterY, pointX, pointY, rotationAngle)
+    '
+    ' Rotates a 2D point around a center using standard rotation formulas.
+    ' X' = (X - CX)*cos - (Y - CY)*sin + CX
+    ' Y' = (X - CX)*sin + (Y - CY)*cos + CY
+    '
+
+    deltaX = pointX - rotationCenterX
+    deltaY = pointY - rotationCenterY
+    sinAngle = SIN(rotationAngle)
+    cosAngle = COS(rotationAngle)
+    pointX = deltaX * cosAngle - deltaY * sinAngle + rotationCenterX
+    pointY = deltaX * sinAngle + deltaY * cosAngle + rotationCenterY
+END SUB
+
+SUB SetPalette (red, green, blue, colorIndex)
+    '
+    ' Sets palette entry 'colorIndex' to (red,green,blue).
+    ' Each component 0..63.
+    '
+
+    IF red < 0 THEN red = 0
+    IF green < 0 THEN green = 0
+    IF blue < 0 THEN blue = 0
+    IF red > 63 THEN red = 63
+    IF green > 63 THEN green = 63
+    IF blue > 63 THEN blue = 63
+
+    OUT &H3C8, colorIndex
+    OUT &H3C9, red
+    OUT &H3C9, green
+    OUT &H3C9, blue
+END SUB
+
+SUB WaitForInput
+    '
+    ' Waits for exactly one keystroke and stores it into inputKey$.
+    '
+
+    inputKey$ = INPUT$(1)
+END SUB
+
diff --git a/3D GFX/Helicopter/data.dat b/3D GFX/Helicopter/data.dat
new file mode 100755
index 0000000..b97fdd7
--- /dev/null
+++ b/3D GFX/Helicopter/data.dat	
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diff --git a/3D GFX/Helicopter/data2.dat b/3D GFX/Helicopter/data2.dat
new file mode 100755
index 0000000..a6a3427
--- /dev/null
+++ b/3D GFX/Helicopter/data2.dat	
@@ -0,0 +1,50 @@
+0 -10 -5
+0 -10 5
+-20 -10 -5
+-20 -10 5
+-20 0 -5
+-20 0 5
+0 10 -5
+0 10 5
+30 10 0
+10 0 -5
+10 0 5
+30 0 0
+40 10 0
+40 20 0
+-30 15 -3
+-30 15 3
+30 15 -3
+30 15 3
+999 999 999
+0 1
+2 3
+0 2
+1 3
+4 5
+2 4
+3 5
+4 0
+5 1
+6 7
+4 6
+5 7
+6 0
+7 1
+6 8
+7 8
+9 10
+6 9
+7 10
+0 9
+1 10
+9 11
+10 11
+11 12
+12 13
+13 8
+14 15
+16 17
+14 17
+15 16
+999 999
\ No newline at end of file
diff --git a/3D GFX/Helicopter/demo, 1.png b/3D GFX/Helicopter/demo, 1.png
new file mode 100644
index 0000000..2710913
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diff --git a/3D GFX/Helicopter/demo, 2.png b/3D GFX/Helicopter/demo, 2.png
new file mode 100644
index 0000000..a01153d
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diff --git a/3D GFX/Helicopter/demo, 3.png b/3D GFX/Helicopter/demo, 3.png
new file mode 100644
index 0000000..f6989bc
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diff --git a/3D GFX/Helicopter/demo, 4.png b/3D GFX/Helicopter/demo, 4.png
new file mode 100644
index 0000000..2aa35b3
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diff --git a/3D GFX/Miscellaneous/!.bas b/3D GFX/Miscellaneous/!.bas
new file mode 100644
index 0000000..5709555
--- /dev/null
+++ b/3D GFX/Miscellaneous/!.bas	
@@ -0,0 +1,289 @@
+' 3D Wireframe Exclamation Mark.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Usage:
+'   Up, Down, Left, Right, w, z - rotate exclamation mark
+'   <space> - slow down rotation
+'   q - quit program
+'
+' Changelog:
+'   ~2000 - Initial version
+
+DECLARE SUB LoadVertexAndLineData ()
+' Loads vertex and line data from DATA statements into arrays.
+' It reads coordinates and line indices, and determines the count of vertices and lines.
+
+DECLARE SUB NormalizeCoordinates ()
+' Normalizes coordinates to fit the screen by scaling them.
+' It finds the maximum absolute value among the coordinates and scales all coordinates accordingly.
+
+DECLARE SUB Render3DWireframe ()
+' Renders the 3D wireframe of an exclamation mark.
+' It updates rotation angles, rotates and projects vertices, and draws lines between them.
+' It also handles user input to control the rotation and exit the program.
+
+DECLARE SUB PrecomputeTrigonometricValues ()
+' Precomputes sine and cosine values for angles from 0 to 360 degrees.
+' This allows for faster computation during the rendering process.
+
+DEFINT A-Z
+
+' Arrays to store vertex coordinates and projected coordinates
+DIM SHARED vertexX(100), vertexY(100), vertexZ(100)
+DIM SHARED startX(100), startY(100), endX(100), endY(100)
+DIM SHARED x(100), y(100), z(100), lineStartIndex(100), lineEndIndex(100)
+
+' Arrays to store precomputed sine and cosine values
+DIM SHARED cosineValue&(360), sineValue&(360)
+
+' Variables to store the number of vertices and lines, and rotation angles
+DIM SHARED vertexCount, lineCount
+DIM SHARED angleX, angleY
+
+' Initialize rotation angles
+angleX = 0
+angleY = 0
+
+' Set screen mode and clear the screen
+SCREEN 12
+CLS
+
+' Precompute sine and cosine values for faster rendering
+PrecomputeTrigonometricValues
+
+' Load vertex and line data from DATA statements
+LoadVertexAndLineData
+
+' Normalize coordinates to fit the screen
+NormalizeCoordinates
+
+' Render the 3D wireframe
+Render3DWireframe
+
+' Vertex data
+DATA 5,-60,-10
+DATA 15,-50,-10
+DATA 15,0,-10
+DATA 5,10,-10
+DATA -5,10,-10
+DATA -15,0,-10
+DATA -15,-50,-10
+DATA -5,-60,-10
+DATA 5,-60,10
+DATA 15,-50,10
+DATA 15,0,10
+DATA 5,10,10
+DATA -5,10,10
+DATA -15,0,10
+DATA -15,-50,10
+DATA -5,-60,10
+DATA 5,20,10
+DATA 15,30,10
+DATA 15,40,10
+DATA 5,50,10
+DATA -5,50,10
+DATA -15,40,10
+DATA -15,30,10
+DATA -5,20,10
+DATA 5,20,-10
+DATA 15,30,-10
+DATA 15,40,-10
+DATA 5,50,-10
+DATA -5,50,-10
+DATA -15,40,-10
+DATA -15,30,-10
+DATA -5,20,-10
+DATA 999,999,999
+
+' Line data
+DATA 0,1
+DATA 1,2
+DATA 2,3
+DATA 3,4
+DATA 4,5
+DATA 5,6
+DATA 6,7
+DATA 7,0
+DATA 8,9
+DATA 9,10
+DATA 10,11
+DATA 11,12
+DATA 12,13
+DATA 13,14
+DATA 14,15
+DATA 15,8
+DATA 0,8
+DATA 1,9
+DATA 2,10
+DATA 3,11
+DATA 4,12
+DATA 5,13
+DATA 6,14
+DATA 7,15
+DATA 16,17
+DATA 17,18
+DATA 18,19
+DATA 19,20
+DATA 20,21
+DATA 21,22
+DATA 22,23
+DATA 23,16
+DATA 24,25
+DATA 25,26
+DATA 26,27
+DATA 27,28
+DATA 28,29
+DATA 29,30
+DATA 30,31
+DATA 31,24
+DATA 24,16
+DATA 25,17
+DATA 26,18
+DATA 27,19
+DATA 28,20
+DATA 29,21
+DATA 30,22
+DATA 31,23
+DATA 999,999
+
+SUB LoadVertexAndLineData
+    ' Load vertex coordinates from DATA statements into arrays x, y, and z.
+    ' The loop continues until a sentinel value (999) is encountered.
+    FOR i = 0 TO 10000
+        READ x(i), y(i), z(i)
+        IF x(i) = 999 THEN x(i) = 0: y(i) = 0: z(i) = 0: GOTO EndVertexData
+    NEXT i
+
+EndVertexData:
+    vertexCount = i
+
+    ' Load line data from DATA statements into arrays lineStartIndex and lineEndIndex.
+    ' The loop continues until a sentinel value (999) is encountered.
+    FOR i = 0 TO 10000
+        READ lineStartIndex(i), lineEndIndex(i)
+        IF lineStartIndex(i) = 999 THEN GOTO EndLineData
+    NEXT i
+
+EndLineData:
+    lineCount = i
+END SUB
+
+SUB NormalizeCoordinates
+    ' Normalize coordinates to fit the screen by scaling them.
+    ' First, find the maximum absolute value among the coordinates.
+    maxValue = 0
+    FOR i = 0 TO vertexCount
+        IF ABS(x(i)) > maxValue THEN maxValue = ABS(x(i))
+        IF ABS(y(i)) > maxValue THEN maxValue = ABS(y(i))
+        IF ABS(z(i)) > maxValue THEN maxValue = ABS(z(i))
+    NEXT i
+
+    ' Scale all coordinates by a factor of 100 / maxValue to fit the screen.
+    scaleFactor = 100 / maxValue
+    FOR i = 0 TO vertexCount
+        x(i) = x(i) * scaleFactor
+        y(i) = y(i) * scaleFactor
+        z(i) = z(i) * scaleFactor
+    NEXT i
+END SUB
+
+SUB PrecomputeTrigonometricValues
+    ' Precompute sine and cosine values for angles from 0 to 360 degrees.
+    ' This allows for faster computation during the rendering process.
+    FOR angle! = 0 TO 359 / 57.29577950999999# STEP 1 / 57.29577950999999#
+        cosineValue&(angle) = INT(.5 + COS(angle!) * 1024)
+        sineValue&(angle) = INT(.5 + SIN(angle!) * 1024)
+        angle = angle + 1
+    NEXT angle!
+END SUB
+
+SUB Render3DWireframe
+    DO
+        ' Update rotation angles based on user input
+        angleX = angleX + deltaX
+        angleY = angleY + deltaY
+        angleZ = angleZ + deltaZ
+        SOUND 0, 1
+
+        ' Ensure rotation angles stay within the range of 0 to 359 degrees
+        IF angleX <= 0 THEN angleX = angleX + 360
+        IF angleY <= 0 THEN angleY = angleY + 360
+        IF angleZ <= 0 THEN angleZ = angleZ + 360
+        IF angleX >= 360 THEN angleX = angleX - 360
+        IF angleY >= 360 THEN angleY = angleY - 360
+        IF angleZ >= 360 THEN angleZ = angleZ - 360
+
+        ' Get precomputed sine and cosine values for the rotation angles
+        cosX& = cosineValue&(angleX): sinX& = sineValue&(angleX)
+        cosY& = cosineValue&(angleY): sinY& = sineValue&(angleY)
+        cosZ& = cosineValue&(angleZ): sinZ& = sineValue&(angleZ)
+
+        ' Rotate and project vertices onto the 2D screen
+        FOR i = 0 TO vertexCount - 1
+            originalX = x(i): originalY = y(i): originalZ = z(i)
+            rotatedX = (originalX * cosX& - originalY * sinX&) \ 1024
+            rotatedY = (originalX * sinX& + originalY * cosX&) \ 1024
+            tempX& = (rotatedX * cosY& - originalZ * sinY&) \ 1024
+            tempZ = (rotatedX * sinY& + originalZ * cosY&) \ 1024
+            tempY& = (rotatedY * cosZ& - tempZ * sinZ&) \ 1024
+            finalZ = (rotatedY * sinZ& + tempZ * cosZ&) \ 1024
+
+            ' Adjust the Z-coordinate to add perspective
+            finalZ = finalZ + 300
+
+            ' Project the 3D coordinates onto the 2D screen
+            vertexX(i) = 320 + (tempX& / finalZ * 500)
+            vertexY(i) = 240 + (tempY& / finalZ * 500)
+        NEXT i
+
+        ' Draw lines between the projected vertices
+        FOR i = 0 TO lineCount - 1
+            startVertex = lineStartIndex(i)
+            endVertex = lineEndIndex(i)
+            startXCoord = vertexX(startVertex)
+            startYCoord = vertexY(startVertex)
+            endXCoord = vertexX(endVertex)
+            endYCoord = vertexY(endVertex)
+
+            ' Erase the previous line
+            LINE (startX(i), startY(i))-(endX(i), endY(i)), 0
+
+            ' Draw the new line
+            LINE (endXCoord, endYCoord)-(startXCoord, startYCoord), 15
+
+            ' Store the current coordinates for the next iteration
+            startX(i) = endXCoord: startY(i) = endYCoord
+            endX(i) = startXCoord: endY(i) = startYCoord
+        NEXT i
+
+        ' Handle user input to control the rotation
+        keyPressed$ = INKEY$
+        IF keyPressed$ <> "" THEN
+            SELECT CASE keyPressed$
+                CASE CHR$(0) + CHR$(72)  ' Up arrow
+                    deltaX = deltaX + 1
+                CASE CHR$(0) + CHR$(80)  ' Down arrow
+                    deltaX = deltaX - 1
+                CASE CHR$(0) + CHR$(75)  ' Left arrow
+                    deltaY = deltaY - 1
+                CASE CHR$(0) + CHR$(77)  ' Right arrow
+                    deltaY = deltaY + 1
+                CASE "w"
+                    deltaZ = deltaZ - 1
+                CASE "z"
+                    deltaZ = deltaZ + 1
+                CASE " "  ' Space bar
+                    deltaX = deltaX / 2
+                    deltaY = deltaY / 2
+                    deltaZ = deltaZ / 2
+                CASE CHR$(27)  ' Escape key
+                    SYSTEM
+            END SELECT
+        END IF
+    LOOP
+END SUB
+
diff --git a/3D GFX/Miscellaneous/!.webm b/3D GFX/Miscellaneous/!.webm
new file mode 100644
index 0000000..1786991
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diff --git a/3D GFX/Miscellaneous/3D ball.bas b/3D GFX/Miscellaneous/3D ball.bas
new file mode 100755
index 0000000..dd3de01
--- /dev/null
+++ b/3D GFX/Miscellaneous/3D ball.bas	
@@ -0,0 +1,183 @@
+' 3D animation of point-cloud ball bouncing around the screen
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 1999, Initial version.
+' 2024 - 2025, Improved code readability.
+
+DECLARE SUB InitializeScene ()
+DECLARE SUB UpdateOrientation ()
+DECLARE SUB DisplayPoints (angle1 AS SINGLE, angle2 AS SINGLE, angle3 AS SINGLE)
+RANDOMIZE TIMER
+SCREEN 12
+
+' Shared arrays to hold the positions of points in 3D space
+DIM SHARED pointX(1 TO 1000) AS SINGLE
+DIM SHARED pointY(1 TO 1000) AS SINGLE
+DIM SHARED pointZ(1 TO 1000) AS SINGLE
+
+' Shared arrays to hold the previous on-screen positions of points
+DIM SHARED prevX(1 TO 1000) AS INTEGER
+DIM SHARED prevY(1 TO 1000) AS INTEGER
+
+' Shared variables for simulation control
+DIM SHARED totalPoints AS INTEGER
+DIM SHARED ballX
+DIM SHARED ballY
+DIM SHARED ballVelocityX
+DIM SHARED ballVelocityY
+
+' Shared variables for rotation angles and their velocities
+DIM SHARED rotationAngle1
+DIM SHARED rotationAngle2
+DIM SHARED rotationAngle3
+DIM SHARED angularVelocity1
+DIM SHARED angularVelocity2
+DIM SHARED angularVelocity3
+
+' Initialize the total number of points to be displayed
+totalPoints = 500
+
+CALL InitializeScene
+
+' Initialization of rotation angles and ball position
+rotationAngle1 = 0
+rotationAngle2 = 0
+rotationAngle3 = 0
+
+' Main loop
+DO
+    CALL DisplayPoints(rotationAngle1, rotationAngle2, rotationAngle3)
+
+    ' Update the rotation angles based on their velocities
+    rotationAngle1 = rotationAngle1 + angularVelocity1
+    rotationAngle2 = rotationAngle2 + angularVelocity2
+    rotationAngle3 = rotationAngle3 + angularVelocity3
+
+    ' Add force of gravity
+    ballVelocityY = ballVelocityY + .1
+
+    ' Update the ball's position and velocity
+    ballY = ballY + ballVelocityY
+    ballX = ballX + ballVelocityX
+
+    ' Check for ball bounce conditions
+    IF ballY > 160 THEN
+        ballVelocityY = -ballVelocityY
+        ballVelocityX = ballVelocityX + (RND * 2 - 1)
+        CALL UpdateOrientation
+    END IF
+
+    IF ballX < -200 OR ballX > 200 THEN
+        ballVelocityX = -ballVelocityX
+        CALL UpdateOrientation
+    END IF
+
+    ' Check for user input to exit the program
+    a$ = INKEY$
+    IF a$ <> "" THEN
+        CLS
+        SYSTEM
+    END IF
+LOOP
+
+' Subroutine to display the points on the screen
+SUB DisplayPoints (angle1 AS SINGLE, angle2 AS SINGLE, angle3 AS SINGLE)
+
+    ' Calculate the sine and cosine for rotation angles
+    s1 = SIN(angle1)
+    c1 = COS(angle1)
+    s2 = SIN(angle2)
+    c2 = COS(angle2)
+    s3 = SIN(angle3)
+    c3 = COS(angle3)
+
+    ' For each point, apply rotation transformations and project to 2D
+    FOR a = 1 TO totalPoints
+        x = pointX(a)
+        y = pointY(a)
+        z = pointZ(a)
+
+        x1 = x * s1 + y * c1
+        y1 = x * c1 - y * s1
+
+        z1 = z * s2 + y1 * c2
+        y2 = z * c2 - y1 * s2
+
+        z2 = z1 * s3 + x1 * c3
+        x2 = z1 * c3 - x1 * s3
+
+        ' Perspective projection
+        z2 = z2 + 200
+
+        ' Convert to screen coordinates and apply ball offset
+        xScreen = x2 / z2 * 320 + 320 + ballX
+        yScreen = y2 / z2 * 300 + 240 + ballY
+
+        ' Erase the previous point position and draw the new one
+        PSET (prevX(a), prevY(a)), 0
+        PSET (xScreen, yScreen), 3
+
+        ' Update the previous on-screen positions
+        prevX(a) = xScreen
+        prevY(a) = yScreen
+    NEXT a
+END SUB
+
+' Subroutine to initialize the 3D points and ball properties
+SUB InitializeScene
+    PRINT "Calculating coordinates"
+    PRINT "Please wait....."
+
+    ' Generate random 3D coordinates for each point
+    FOR a = 1 TO totalPoints
+        ang1 = RND * 100
+        ang2 = RND * 100
+        ang3 = RND * 100
+
+        s1 = SIN(ang1)
+        c1 = COS(ang1)
+        s2 = SIN(ang2)
+        c2 = COS(ang2)
+        s3 = SIN(ang3)
+        c3 = COS(ang3)
+
+        ' Apply rotation transformations to the point
+        x = 50
+        y = 0
+        z = 0
+
+        x1 = x * s1 + y * c1
+        y1 = x * c1 - y * s1
+
+        z1 = z * s2 + y1 * c2
+        y2 = z * c2 - y1 * s2
+
+        z2 = z1 * s3 + x1 * c3
+        x2 = z1 * c3 - x1 * s3
+
+        pointX(a) = x2
+        pointY(a) = y2
+        pointZ(a) = z2
+    NEXT a
+
+    ' Set the initial ball velocity
+    ballVelocityX = 2 + RND
+    ballY = -100
+
+    CALL UpdateOrientation
+
+    CLS
+END SUB
+
+' Subroutine to update the angular velocities for rotation
+SUB UpdateOrientation
+    angularVelocity1 = (RND - .5) / 16
+    angularVelocity2 = (RND - .5) / 16
+    angularVelocity3 = (RND - .5) / 16
+END SUB
+
diff --git a/3D GFX/Miscellaneous/3D ball.webm b/3D GFX/Miscellaneous/3D ball.webm
new file mode 100644
index 0000000..cd04bfc
Binary files /dev/null and b/3D GFX/Miscellaneous/3D ball.webm differ
diff --git a/3D GFX/Miscellaneous/3D text.bas b/3D GFX/Miscellaneous/3D text.bas
new file mode 100755
index 0000000..17b52b8
--- /dev/null
+++ b/3D GFX/Miscellaneous/3D text.bas	
@@ -0,0 +1,475 @@
+' Renders 3D text within 3D room.
+' User can freely fly around the room and observe the text from different angles.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003, Initial version
+' 2024 - 2025, Improved program readability
+'
+' Keyboard controls:
+'   cursor keys and to z, w - rotate
+'   <SPACE> - slow down
+'   q and <ESC> - quit program
+'   + / - - move up / down
+
+
+DECLARE SUB defineOctagon (x!, y!, z!, size!)
+DECLARE SUB printText (x AS SINGLE, y AS SINGLE, text AS STRING)
+DECLARE SUB renderCharacter (x AS SINGLE, y AS SINGLE, character AS STRING)
+DECLARE SUB readFontData ()
+DECLARE SUB defineSquare (x AS SINGLE, y AS SINGLE, z AS SINGLE, size AS SINGLE)
+DECLARE SUB defineRectangle (x AS SINGLE, y AS SINGLE, z AS SINGLE, size AS SINGLE)
+DECLARE SUB createFloor ()
+DECLARE SUB addPoint (x AS INTEGER, y AS INTEGER, z AS INTEGER)
+DECLARE SUB initializeProgram ()
+DECLARE SUB addSquare (x1 AS INTEGER, y1 AS INTEGER, z1 AS INTEGER)
+DECLARE SUB defineCubeAndRectangle ()
+DECLARE SUB multiplyCoordinates ()
+DECLARE SUB render3DScene ()
+DECLARE SUB calculateSineCosine ()
+
+DIM SHARED pointX(4000) AS SINGLE, pointY(4000) AS SINGLE, pointZ(4000) AS SINGLE
+DIM SHARED x(4000) AS SINGLE, y(4000) AS SINGLE, z(4000) AS SINGLE
+DIM SHARED oldPointX(4000) AS SINGLE, oldPointY(4000) AS SINGLE, oldPointZ(4000) AS SINGLE
+DIM SHARED lineStart(4000) AS INTEGER, lineEnd(4000) AS INTEGER
+DIM SHARED lineColor(4000) AS INTEGER
+DIM SHARED numPoints AS INTEGER, numLines AS INTEGER
+DIM SHARED userX AS SINGLE, userY AS SINGLE, userZ AS SINGLE, userSpeed AS SINGLE, userDirection AS SINGLE
+DIM SHARED fontPointX(0 TO 10, 0 TO 255) AS SINGLE, fontPointY(0 TO 10, 0 TO 255) AS SINGLE
+DIM SHARED fontLineStart(0 TO 10, 0 TO 255) AS INTEGER, fontLineEnd(0 TO 10, 0 TO 255) AS INTEGER
+
+userX = 0
+userY = 0
+userZ = -100
+
+initializeProgram
+render3DScene
+
+SUB createFloor
+' Create the floor of the 3D room using hexagons and squares
+FOR x = -100 TO 0 STEP 12.067 + .3
+    FOR z = -100 TO 0 STEP 12.067 + .3
+        defineOctagon x, -125, z, 6.53
+        defineRectangle x + 6.033 + .15, -125, z + 6.033 + .15, 3.111 + .3
+    NEXT z
+NEXT x
+
+' Loop to create squares
+FOR y = -100 TO 0 STEP 20.3
+    FOR x = -100 TO 0 STEP 20.3
+        defineSquare x, y, 200, 10
+    NEXT x
+NEXT y
+END SUB
+
+SUB defineCubeAndRectangle
+' Define the corners of a cube
+pointX(numPoints + 1) = -150
+pointY(numPoints + 1) = -125
+pointZ(numPoints + 1) = -200
+pointX(numPoints + 2) = 150
+pointY(numPoints + 2) = -125
+pointZ(numPoints + 2) = -200
+pointX(numPoints + 3) = 150
+pointY(numPoints + 3) = 125
+pointZ(numPoints + 3) = -200
+pointX(numPoints + 4) = -150
+pointY(numPoints + 4) = 125
+pointZ(numPoints + 4) = -200
+pointX(numPoints + 5) = -150
+pointY(numPoints + 5) = -125
+pointZ(numPoints + 5) = 200
+pointX(numPoints + 6) = 150
+pointY(numPoints + 6) = -125
+pointZ(numPoints + 6) = 200
+pointX(numPoints + 7) = 150
+pointY(numPoints + 7) = 125
+pointZ(numPoints + 7) = 200
+pointX(numPoints + 8) = -150
+pointY(numPoints + 8) = 125
+pointZ(numPoints + 8) = 200
+
+' Define the lines connecting the corners
+lineStart(numLines + 1) = numPoints + 1
+lineEnd(numLines + 1) = numPoints + 2
+lineStart(numLines + 2) = numPoints + 2
+lineEnd(numLines + 2) = numPoints + 3
+lineStart(numLines + 3) = numPoints + 3
+lineEnd(numLines + 3) = numPoints + 4
+lineStart(numLines + 4) = numPoints + 4
+lineEnd(numLines + 4) = numPoints + 1
+lineStart(numLines + 5) = numPoints + 5
+lineEnd(numLines + 5) = numPoints + 6
+lineStart(numLines + 6) = numPoints + 6
+lineEnd(numLines + 6) = numPoints + 7
+lineStart(numLines + 7) = numPoints + 7
+lineEnd(numLines + 7) = numPoints + 8
+lineStart(numLines + 8) = numPoints + 8
+lineEnd(numLines + 8) = numPoints + 5
+lineStart(numLines + 9) = numPoints + 5
+lineEnd(numLines + 9) = numPoints + 1
+lineStart(numLines + 10) = numPoints + 6
+lineEnd(numLines + 10) = numPoints + 2
+lineStart(numLines + 11) = numPoints + 7
+lineEnd(numLines + 11) = numPoints + 3
+lineStart(numLines + 12) = numPoints + 8
+lineEnd(numLines + 12) = numPoints + 4
+
+numPoints = numPoints + 8
+numLines = numLines + 12
+
+' Define the corners of rectangle
+pointX(numPoints + 1) = -150
+pointY(numPoints + 1) = -125 + 201
+pointZ(numPoints + 1) = 0
+pointX(numPoints + 2) = -150
+pointY(numPoints + 2) = -125 + 201
+pointZ(numPoints + 2) = 89
+pointX(numPoints + 3) = -150
+pointY(numPoints + 3) = -125
+pointZ(numPoints + 3) = 89
+pointX(numPoints + 4) = -150
+pointY(numPoints + 4) = -125
+pointZ(numPoints + 4) = 0
+
+' Define the lines connecting these corners
+lineStart(numLines + 1) = numPoints + 1
+lineEnd(numLines + 1) = numPoints + 2
+lineStart(numLines + 2) = numPoints + 2
+lineEnd(numLines + 2) = numPoints + 3
+lineStart(numLines + 3) = numPoints + 3
+lineEnd(numLines + 3) = numPoints + 4
+lineStart(numLines + 4) = numPoints + 4
+lineEnd(numLines + 4) = numPoints + 1
+
+numPoints = numPoints + 4
+numLines = numLines + 4
+
+printText 0, 0, "three dimensional "
+printText 0, -3, "text example"
+printText 0, -6, "etc etc etc"
+END SUB
+
+SUB defineOctagon (x, y, z, size)
+' Initialize variables
+b = 0
+f = .3925
+
+' Loop to create points of the octagon
+FOR a = 0 + f TO 6 + f STEP 6.28 / 8
+    x1 = SIN(a) * size
+    y1 = COS(a) * size
+    b = b + 1
+    ' Store the points in the shared arrays
+    pointX(numPoints + b) = x1 + x
+    pointY(numPoints + b) = y
+    pointZ(numPoints + b) = y1 + z
+NEXT a
+
+' Define the lines connecting these points
+lineStart(numLines + 1) = numPoints + 1
+lineEnd(numLines + 1) = numPoints + 2
+lineColor(numLines + 1) = 12
+lineStart(numLines + 2) = numPoints + 2
+lineEnd(numLines + 2) = numPoints + 3
+lineColor(numLines + 2) = 12
+lineStart(numLines + 3) = numPoints + 3
+lineEnd(numLines + 3) = numPoints + 4
+lineColor(numLines + 3) = 12
+lineStart(numLines + 4) = numPoints + 4
+lineEnd(numLines + 4) = numPoints + 5
+lineColor(numLines + 4) = 12
+lineStart(numLines + 5) = numPoints + 5
+lineEnd(numLines + 5) = numPoints + 6
+lineColor(numLines + 5) = 12
+lineStart(numLines + 6) = numPoints + 6
+lineEnd(numLines + 6) = numPoints + 7
+lineColor(numLines + 6) = 12
+lineStart(numLines + 7) = numPoints + 7
+lineEnd(numLines + 7) = numPoints + 8
+lineColor(numLines + 7) = 12
+lineStart(numLines + 8) = numPoints + 8
+lineEnd(numLines + 8) = numPoints + 1
+lineColor(numLines + 8) = 12
+
+numPoints = numPoints + b
+numLines = numLines + 8
+END SUB
+
+SUB defineRectangle (x AS SINGLE, y AS SINGLE, z AS SINGLE, size AS SINGLE)
+' Define the corners of the rectangle
+pointX(numPoints + 1) = x
+pointY(numPoints + 1) = y
+pointZ(numPoints + 1) = z + size
+pointX(numPoints + 2) = x + size
+pointY(numPoints + 2) = y
+pointZ(numPoints + 2) = z
+pointX(numPoints + 3) = x
+pointY(numPoints + 3) = y
+pointZ(numPoints + 3) = z - size
+pointX(numPoints + 4) = x - size
+pointY(numPoints + 4) = y
+pointZ(numPoints + 4) = z
+
+' Define the lines connecting these corners
+lineStart(numLines + 1) = numPoints + 1
+lineEnd(numLines + 1) = numPoints + 2
+lineColor(numLines + 1) = 10
+lineStart(numLines + 2) = numPoints + 2
+lineEnd(numLines + 2) = numPoints + 3
+lineColor(numLines + 2) = 10
+lineStart(numLines + 3) = numPoints + 3
+lineEnd(numLines + 3) = numPoints + 4
+lineColor(numLines + 3) = 10
+lineStart(numLines + 4) = numPoints + 4
+lineEnd(numLines + 4) = numPoints + 1
+lineColor(numLines + 4) = 10
+
+' Update the counters
+numPoints = numPoints + 4
+numLines = numLines + 4
+END SUB
+
+SUB defineSquare (x AS SINGLE, y AS SINGLE, z AS SINGLE, size AS SINGLE)
+' Define the corners of the square
+pointX(numPoints + 1) = x - size
+pointY(numPoints + 1) = y - size
+pointZ(numPoints + 1) = z
+pointX(numPoints + 2) = x + size
+pointY(numPoints + 2) = y - size
+pointZ(numPoints + 2) = z
+pointX(numPoints + 3) = x + size
+pointY(numPoints + 3) = y + size
+pointZ(numPoints + 3) = z
+pointX(numPoints + 4) = x - size
+pointY(numPoints + 4) = y + size
+pointZ(numPoints + 4) = z
+
+' Define the lines connecting these corners
+lineStart(numLines + 1) = numPoints + 1
+lineEnd(numLines + 1) = numPoints + 2
+lineColor(numLines + 1) = 14
+lineStart(numLines + 2) = numPoints + 2
+lineEnd(numLines + 2) = numPoints + 3
+lineColor(numLines + 2) = 14
+lineStart(numLines + 3) = numPoints + 3
+lineEnd(numLines + 3) = numPoints + 4
+lineColor(numLines + 3) = 14
+lineStart(numLines + 4) = numPoints + 4
+lineEnd(numLines + 4) = numPoints + 1
+lineColor(numLines + 4) = 14
+
+' Update the counters
+numPoints = numPoints + 4
+numLines = numLines + 4
+END SUB
+
+SUB initializeProgram
+' Initialize the screen and clear it
+SCREEN 12
+CLS
+
+' Set the default color for all points
+FOR a = 1 TO 4000
+    lineColor(a) = 15
+NEXT a
+
+' Initialize counters
+numPoints = 0
+numLines = 0
+
+' Initialize font data
+FOR a = 0 TO 255
+    FOR b = 0 TO 10
+        fontPointX(b, a) = 999
+        fontPointY(b, a) = 999
+        fontLineStart(b, a) = 999
+        fontLineEnd(b, a) = 999
+    NEXT b
+NEXT a
+
+' Read the font data
+readFontData
+
+' Define the corners of the cubes
+defineCubeAndRectangle
+END SUB
+
+SUB printText (x AS SINGLE, y AS SINGLE, text AS STRING)
+' Loop to print each character
+FOR b = 1 TO LEN(text)
+    c$ = RIGHT$(LEFT$(text, b), 1)
+    renderCharacter x + b * 3, y, c$
+NEXT b
+END SUB
+
+SUB readFontData
+' Open the font file
+OPEN "font.dat" FOR INPUT AS #1
+
+' Loop to read the font data
+3
+IF EOF(1) <> 0 THEN GOTO 2
+LINE INPUT #1, a$
+
+IF LEFT$(a$, 1) = "#" THEN
+  chr = ASC(RIGHT$(LEFT$(a$, 3), 1))
+  ' Initialize counters
+  pp = 0
+  lp = 0
+END IF
+
+' Read the points for the character
+IF LEFT$(a$, 1) = "p" THEN
+    fontPointX(pp, chr) = VAL(RIGHT$(LEFT$(a$, 3), 1))
+    fontPointY(pp, chr) = VAL(RIGHT$(LEFT$(a$, 5), 1))
+    pp = pp + 1
+END IF
+
+' Read the lines for the character
+IF LEFT$(a$, 1) = "l" THEN
+    fontLineStart(lp, chr) = VAL(RIGHT$(LEFT$(a$, 3), 1))
+    fontLineEnd(lp, chr) = VAL(RIGHT$(LEFT$(a$, 5), 1))
+    lp = lp + 1
+END IF
+
+GOTO 3
+
+' Close the font file
+2
+CLOSE #1
+END SUB
+
+SUB render3DScene
+' Main loop for the 3D rendering
+1
+userX = userX + SIN(rotationAngleX) * userSpeed
+userZ = userZ + COS(rotationAngleX) * userSpeed
+userX = userX + COS(rotationAngleX) * userDirection
+userZ = userZ - SIN(rotationAngleX) * userDirection
+rotationAngleX = rotationAngleX + angleIncrementX
+rotationAngleY = rotationAngleY + angleIncrementY
+cosAngleX = COS(rotationAngleX): sinAngleX = SIN(rotationAngleX)
+cosAngleY = COS(rotationAngleY): sinAngleY = SIN(rotationAngleY)
+
+' Transform the coordinates
+FOR a = 1 TO numPoints
+    oldPointX(a) = pointX(a) - userX
+    oldPointY(a) = -pointY(a) - userY
+    oldPointZ(a) = pointZ(a) - userZ
+    x1 = (oldPointX(a) * cosAngleX - oldPointZ(a) * sinAngleX)
+    z1 = (oldPointX(a) * sinAngleX + oldPointZ(a) * cosAngleX)
+    y1 = (oldPointY(a) * cosAngleY - z1 * sinAngleY)
+    z2 = (oldPointY(a) * sinAngleY + z1 * cosAngleY)
+
+    ' Store the transformed coordinates
+    oldPointX(a) = x(a)
+    oldPointY(a) = y(a)
+
+    ' Check if the point is within the view
+    IF z2 < 20 THEN
+        x(a) = -1
+    ELSE
+        ' Apply perspective transformation
+        x(a) = 320 + (x1 / z2 * 500)
+        y(a) = 240 + (y1 / z2 * 500)
+    END IF
+NEXT
+
+' Draw the lines
+FOR a = 1 TO numLines
+    p1 = lineStart(a)
+    p2 = lineEnd(a)
+
+    ' Check if the points are within the view
+    IF oldPointX(p1) = -1 OR oldPointX(p2) = -1 THEN
+        ' Do nothing
+    ELSE
+        ' Erase line at old coordinates
+        LINE (oldPointX(p1), oldPointY(p1))-(oldPointX(p2), oldPointY(p2)), 0
+    END IF
+
+    IF x(p1) = -1 OR x(p2) = -1 THEN
+        ' Do nothing
+    ELSE
+        ' Draw line at new coordinates
+        LINE (x(p1), y(p1))-(x(p2), y(p2)), lineColor(a)
+    END IF
+NEXT
+
+' Handle user input
+userInput$ = INKEY$
+
+IF userInput$ <> "" THEN
+    SELECT CASE userInput$
+        CASE CHR$(0) + "P"
+            userSpeed = userSpeed - 1
+        CASE CHR$(0) + "H"
+            userSpeed = userSpeed + 1
+        CASE CHR$(0) + "M"
+            userDirection = userDirection + 1
+        CASE CHR$(0) + "K"
+            userDirection = userDirection - 1
+        CASE "+"
+            userY = userY + 3
+        CASE "-"
+            userY = userY - 3
+        CASE "6"
+            angleIncrementX = angleIncrementX + .01
+        CASE "4"
+            angleIncrementX = angleIncrementX - .01
+        CASE "8"
+            angleIncrementY = angleIncrementY - .01
+        CASE "2"
+            angleIncrementY = angleIncrementY + .01
+        CASE " "
+            angleIncrementX = angleIncrementX / 2
+            angleIncrementY = angleIncrementY / 2
+            angleIncrementZ = angleIncrementZ / 2
+            userSpeed = userSpeed / 2
+            userDirection = userDirection / 2
+        CASE "q"
+            SYSTEM
+        CASE CHR$(27)
+            SYSTEM
+    END SELECT
+END IF
+
+GOTO 1
+END SUB
+
+SUB renderCharacter (x AS SINGLE, y AS SINGLE, character AS STRING)
+' Initialize variables
+b = ASC(character)
+up = 0
+ul = 0
+
+' Loop to create points for the character
+FOR c = 0 TO 100
+    IF fontPointX(c, b) = 999 THEN GOTO 4
+    up = up + 1
+    pointX(numPoints + up) = x + fontPointX(c, b)
+    pointY(numPoints + up) = y - fontPointY(c, b)
+    pointZ(numPoints + up) = 0
+NEXT c
+
+4
+' Loop to define the lines for the character
+FOR c = 0 TO 100
+    IF fontLineStart(c, b) = 999 THEN GOTO 5
+    ul = ul + 1
+    lineStart(numLines + ul) = fontLineStart(c, b) + numPoints + 1
+    lineEnd(numLines + ul) = fontLineEnd(c, b) + numPoints + 1
+    lineColor(numLines + ul) = 4
+NEXT c
+
+5
+' Update the counters
+numPoints = numPoints + up
+numLines = numLines + ul
+END SUB
+
diff --git a/3D GFX/Miscellaneous/3D text.webm b/3D GFX/Miscellaneous/3D text.webm
new file mode 100644
index 0000000..0846d14
Binary files /dev/null and b/3D GFX/Miscellaneous/3D text.webm differ
diff --git a/3D GFX/Miscellaneous/Bouncing cubes.bas b/3D GFX/Miscellaneous/Bouncing cubes.bas
new file mode 100755
index 0000000..e87c62d
--- /dev/null
+++ b/3D GFX/Miscellaneous/Bouncing cubes.bas	
@@ -0,0 +1,351 @@
+' Program to render flying and bouncing cubes on top of a grid-like floor
+'
+' By Svjatoslav Agejenko
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001, Initial version
+' 2024 - 2025, Improved program readability
+'
+' Navigation controls:
+' Arrow keys - Move forward/backward/left/right
+' 2,6,4,8 - Look around (up/down/left/right)
+' -       - Fly upward
+' +       - Fly downward
+
+
+DECLARE SUB updateColliders()
+DECLARE SUB initializeColliders()
+DECLARE SUB renderScene()
+DECLARE SUB initializeEnvironment()
+DECLARE SUB initializeProgram()
+
+DIM SHARED initialNumPoints, initialNumLines, numPoints, numLines
+DIM SHARED pointXCoord(1 TO 1000) AS SINGLE
+DIM SHARED pointYCoord(1 TO 1000) AS SINGLE
+DIM SHARED pointZCoord(1 TO 1000) AS SINGLE
+DIM SHARED renderedXCoord(1 TO 1000) AS SINGLE
+DIM SHARED renderedYCoord(1 TO 1000) AS SINGLE
+DIM SHARED prevRenderedXCoord(1 TO 1000) AS SINGLE
+DIM SHARED prevRenderedYCoord(1 TO 1000) AS SINGLE
+DIM SHARED lineStart(1 TO 1000) AS INTEGER
+DIM SHARED lineEnd(1 TO 1000) AS INTEGER
+DIM SHARED lineColor(1 TO 1000) AS INTEGER
+DIM SHARED prevLineStart(1 TO 1000) AS INTEGER
+DIM SHARED prevLineEnd(1 TO 1000) AS INTEGER
+DIM SHARED prevLineCount AS INTEGER
+DIM SHARED cameraXPos AS SINGLE, cameraXSpeed AS SINGLE
+DIM SHARED cameraYPos AS SINGLE, cameraYSpeed AS SINGLE
+DIM SHARED cameraZPos AS SINGLE, cameraZSpeed AS SINGLE
+DIM SHARED cameraAngleX AS SINGLE, cameraAngleXSpeed AS SINGLE
+DIM SHARED cameraAngleY AS SINGLE, cameraAngleYSpeed AS SINGLE
+DIM SHARED cubeXPos(1 TO 10) AS SINGLE
+DIM SHARED cubeYPos(1 TO 10) AS SINGLE
+DIM SHARED cubeZPos(1 TO 10) AS SINGLE
+DIM SHARED cubeXSpeed(1 TO 10) AS SINGLE
+DIM SHARED cubeYSpeed(1 TO 10) AS SINGLE
+DIM SHARED cubeZSpeed(1 TO 10) AS SINGLE
+DIM SHARED numCubes AS INTEGER
+
+ON ERROR GOTO ErrorHandler
+
+initializeProgram
+initializeEnvironment
+initializeColliders
+
+' The main loop of the program
+MainLoop:
+numPoints = initialNumPoints
+numLines = initialNumLines
+
+updateColliders
+renderScene
+
+' Update positions and angles
+cameraXPos = cameraXPos + cameraXSpeed
+cameraYPos = cameraYPos + cameraYSpeed
+cameraZPos = cameraZPos + cameraZSpeed
+cameraAngleX = cameraAngleX + cameraAngleXSpeed
+cameraAngleY = cameraAngleY + cameraAngleYSpeed
+
+userInput$ = INKEY$
+IF userInput$ <> "" THEN
+    ' Handle arrow keys for movement
+    IF userInput$ = CHR$(0) + "H" THEN
+        cameraZSpeed = cameraZSpeed - SIN(cameraAngleX) / 100
+        cameraXSpeed = cameraXSpeed - COS(cameraAngleX) / 100
+    END IF
+    IF userInput$ = CHR$(0) + "P" THEN
+        cameraZSpeed = cameraZSpeed + SIN(cameraAngleX) / 100
+        cameraXSpeed = cameraXSpeed + COS(cameraAngleX) / 100
+    END IF
+    IF userInput$ = CHR$(0) + "M" THEN
+        cameraZSpeed = cameraZSpeed + COS(cameraAngleX) / 100
+        cameraXSpeed = cameraXSpeed - SIN(cameraAngleX) / 100
+    END IF
+    IF userInput$ = CHR$(0) + "K" THEN
+        cameraZSpeed = cameraZSpeed - COS(cameraAngleX) / 100
+        cameraXSpeed = cameraXSpeed + SIN(cameraAngleX) / 100
+    END IF
+    ' Handle number keys for looking around
+    IF userInput$ = "6" THEN cameraAngleXSpeed = cameraAngleXSpeed - 0.01
+    IF userInput$ = "4" THEN cameraAngleXSpeed = cameraAngleXSpeed + 0.01
+    IF userInput$ = "8" THEN cameraAngleYSpeed = cameraAngleYSpeed - 0.01
+    IF userInput$ = "2" THEN cameraAngleYSpeed = cameraAngleYSpeed + 0.01
+    ' Handle plus and minus keys for flying up and down
+    IF userInput$ = "+" THEN cameraYSpeed = cameraYSpeed - 0.01
+    IF userInput$ = "-" THEN cameraYSpeed = cameraYSpeed + 0.01
+    ' Exit the program on pressing ESC
+    IF userInput$ = CHR$(27) THEN SYSTEM
+END IF
+
+GOTO MainLoop
+
+ErrorHandler:
+END
+RESUME
+
+SUB initializeEnvironment
+' This subroutine initializes environment points
+FOR z = -5 TO 5
+    FOR x = -5 TO 5
+        numPoints = numPoints + 1
+        pointXCoord(numPoints) = x
+        pointYCoord(numPoints) = 0
+        pointZCoord(numPoints) = z
+        ' Add lines between points
+        IF x > -5 THEN
+            numLines = numLines + 1
+            lineStart(numLines) = numPoints
+            lineEnd(numLines) = numPoints - 1
+            lineColor(numLines) = 3
+        END IF
+        IF z > -5 THEN
+            numLines = numLines + 1
+            lineStart(numLines) = numPoints
+            lineEnd(numLines) = numPoints - 11
+            lineColor(numLines) = 3
+        END IF
+    NEXT x
+NEXT z
+' Store the number of points and lines
+initialNumPoints = numPoints
+initialNumLines = numLines
+END SUB
+
+SUB updateColliders
+' This subroutine updates the positions and angles of colliders
+FOR a = 1 TO numCubes
+    x = cubeXPos(a)
+    y = cubeYPos(a)
+    z = cubeZPos(a)
+    xs = cubeXSpeed(a)
+    ys = cubeYSpeed(a)
+    zs = cubeZSpeed(a)
+    ' Update the Y-axis position
+    ys = ys - 0.01
+    ' Update the X and Z positions
+    x = x + xs
+    y = y + ys
+    z = z + zs
+    ' Bounce off walls
+    IF x > 5 THEN xs = -0.1
+    IF z > 5 THEN zs = -0.1
+    IF x < -5 THEN xs = 0.1
+    IF z < -5 THEN zs = 0.1
+    ' Reset Y position if it falls below a threshold
+    IF y < 0.5 THEN ys = RND * 0.2 + 0.1
+    ' Create lines for visualization
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 1
+    lineEnd(numLines) = numPoints + 2
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 3
+    lineEnd(numLines) = numPoints + 2
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 3
+    lineEnd(numLines) = numPoints + 4
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 1
+    lineEnd(numLines) = numPoints + 4
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 1
+    lineEnd(numLines) = numPoints + 5
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 2
+    lineEnd(numLines) = numPoints + 6
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 3
+    lineEnd(numLines) = numPoints + 7
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 4
+    lineEnd(numLines) = numPoints + 8
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 5
+    lineEnd(numLines) = numPoints + 6
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 7
+    lineEnd(numLines) = numPoints + 6
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 7
+    lineEnd(numLines) = numPoints + 8
+    lineColor(numLines) = 14
+    numLines = numLines + 1
+    lineStart(numLines) = numPoints + 5
+    lineEnd(numLines) = numPoints + 8
+    lineColor(numLines) = 14
+    ' Update the array with new positions and speeds
+    numPoints = numPoints + 1
+    pointXCoord(numPoints) = x - 0.5
+    pointYCoord(numPoints) = y - 0.5
+    pointZCoord(numPoints) = z - 0.5
+    numPoints = numPoints + 1
+    pointXCoord(numPoints) = x + 0.5
+    pointYCoord(numPoints) = y - 0.5
+    pointZCoord(numPoints) = z - 0.5
+    numPoints = numPoints + 1
+    pointXCoord(numPoints) = x + 0.5
+    pointYCoord(numPoints) = y + 0.5
+    pointZCoord(numPoints) = z - 0.5
+    numPoints = numPoints + 1
+    pointXCoord(numPoints) = x - 0.5
+    pointYCoord(numPoints) = y + 0.5
+    pointZCoord(numPoints) = z - 0.5
+    numPoints = numPoints + 1
+    pointXCoord(numPoints) = x - 0.5
+    pointYCoord(numPoints) = y - 0.5
+    pointZCoord(numPoints) = z + 0.5
+    numPoints = numPoints + 1
+    pointXCoord(numPoints) = x + 0.5
+    pointYCoord(numPoints) = y - 0.5
+    pointZCoord(numPoints) = z + 0.5
+    numPoints = numPoints + 1
+    pointXCoord(numPoints) = x + 0.5
+    pointYCoord(numPoints) = y + 0.5
+    pointZCoord(numPoints) = z + 0.5
+    numPoints = numPoints + 1
+    pointXCoord(numPoints) = x - 0.5
+    pointYCoord(numPoints) = y + 0.5
+    pointZCoord(numPoints) = z + 0.5
+    ' Update the collider array with new positions and speeds
+    cubeXPos(a) = x
+    cubeYPos(a) = y
+    cubeZPos(a) = z
+    cubeXSpeed(a) = xs
+    cubeYSpeed(a) = ys
+    cubeZSpeed(a) = zs
+NEXT a
+END SUB
+
+SUB initializeColliders
+' This subroutine initializes colliders with random positions and speeds
+FOR a = 1 TO numCubes
+    cubeXPos(a) = RND * 10 - 5
+    cubeYPos(a) = 2
+    cubeZPos(a) = RND * 10 - 5
+    cubeXSpeed(a) = RND * 0.5 - 0.25
+    cubeYSpeed(a) = RND * 0.5 + 0.1
+    cubeZSpeed(a) = RND * 0.5 - 0.25
+NEXT a
+END SUB
+
+SUB renderScene
+' Calculate sine and cosine for angle rotation
+s1 = SIN(cameraAngleX)
+c1 = COS(cameraAngleX)
+s2 = SIN(cameraAngleY)
+c2 = COS(cameraAngleY)
+' Loop through all points to render them
+FOR a = 1 TO numPoints
+    x = pointXCoord(a) + cameraXPos
+    y = pointYCoord(a) - cameraYPos
+    z = pointZCoord(a) + cameraZPos
+    ' Rotate the point
+    x1 = x * s1 - z * c1
+    z1 = x * c1 + z * s1
+    y1 = y * s2 - z1 * c2
+    z2 = y * c2 + z1 * s2
+    ' Project the 3D point to a 2D screen coordinate
+    IF z2 < 0.1 THEN
+        renderedXCoord(a) = -1
+    ELSE
+        renderedXCoord(a) = 320 + (x1 / z2 * 400)
+        renderedYCoord(a) = 240 - (y1 / z2 * 400)
+    END IF
+NEXT a
+' Render all lines
+FOR a = 1 TO numLines
+    l1 = prevLineStart(a)
+    l2 = prevLineEnd(a)
+    ' Skip rendering if either end of the line is out of view
+    IF prevRenderedXCoord(l1) = -1 OR prevRenderedXCoord(l2) = -1 THEN
+    ELSE
+        LINE (prevRenderedXCoord(l1), prevRenderedYCoord(l1))-(prevRenderedXCoord(l2), prevRenderedYCoord(l2)), 0
+    END IF
+    ' Update line indices for next frame
+    l1 = lineStart(a)
+    l2 = lineEnd(a)
+    ' Skip rendering if either end of the line is out of view
+    IF renderedXCoord(l1) = -1 OR renderedXCoord(l2) = -1 THEN
+    ELSE
+        LINE (renderedXCoord(l1), renderedYCoord(l1))-(renderedXCoord(l2), renderedYCoord(l2)), lineColor(a)
+    END IF
+NEXT
+' Handle lines that were added during the frame
+IF numLines < prevLineCount THEN
+    FOR a = numLines + 1 TO prevLineCount
+        l1 = prevLineStart(a)
+        l2 = prevLineEnd(a)
+        ' Skip rendering if either end of the line is out of view
+        IF prevRenderedXCoord(l1) = -1 OR prevRenderedXCoord(l2) = -1 THEN
+        ELSE
+            LINE (prevRenderedXCoord(l1), prevRenderedYCoord(l1))-(prevRenderedXCoord(l2), prevRenderedYCoord(l2)), 0
+        END IF
+    NEXT
+END IF
+' Save the current frame's points and lines for next frame
+FOR a = 1 TO numPoints
+    prevRenderedXCoord(a) = renderedXCoord(a)
+    prevRenderedYCoord(a) = renderedYCoord(a)
+NEXT a
+FOR a = 1 TO numLines
+    prevLineStart(a) = lineStart(a)
+    prevLineEnd(a) = lineEnd(a)
+NEXT a
+prevLineCount = numLines
+END SUB
+
+SUB initializeProgram
+' Initialize the screen and variables
+SCREEN 12
+initialNumPoints = 0
+initialNumLines = 0
+numPoints = initialNumPoints
+numLines = initialNumLines
+numCubes = 9
+cameraXPos = 0
+cameraYPos = 4
+cameraZPos = 7
+cameraAngleX = 3.14 / 2
+cameraAngleY = cameraAngleX + 0.6
+' Initialize all lines to have a thickness of 4
+FOR a = 1 TO 1000
+    lineColor(a) = 4
+NEXT a
+' Store the initial state of all lines
+FOR a = 1 TO 1000
+    prevLineStart(a) = 1
+    prevLineEnd(a) = 1
+NEXT a
+END SUB
diff --git a/3D GFX/Miscellaneous/Bouncing cubes.webm b/3D GFX/Miscellaneous/Bouncing cubes.webm
new file mode 100644
index 0000000..2328295
Binary files /dev/null and b/3D GFX/Miscellaneous/Bouncing cubes.webm differ
diff --git a/3D GFX/Miscellaneous/Matrix math.bas b/3D GFX/Miscellaneous/Matrix math.bas
new file mode 100755
index 0000000..431b7e3
--- /dev/null
+++ b/3D GFX/Miscellaneous/Matrix math.bas	
@@ -0,0 +1,75 @@
+' Program to demonstrate 3x3 matrix math for coordinate rotation in 3D space.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.03, Initial version
+' 2024.08, Improved program readability
+
+' Use keys:
+' 7 9 - change alpha angle
+' 4 6 - change beta angle
+' 1 3 - change gamma angle
+' ESC - quit program
+
+DECLARE SUB graphicalCoordinates (xVal AS Single, yVal AS Single, zVal AS Single, x1Val AS Single, y1Val AS Single)
+DECLARE SUB setAngles (alphaVal AS Single, betaVal AS Single, gammaVal AS Single)
+DIM SHARED matrixX1 AS Single, matrixY1 AS Single, matrixZ1 AS Single
+DIM SHARED matrixX2 AS Single, matrixY2 AS Single, matrixZ2 AS Single
+DIM SHARED matrixX3 AS Single, matrixY3 AS Single, matrixZ3 AS Single
+
+SCREEN 7, , , 1
+
+' Main loop starts here
+DO
+    CALL setAngles(angleAlpha, angleBeta, angleGamma)
+
+    FOR y = -70 TO 70 STEP 5
+        FOR x = -70 TO 70 STEP 5
+            CALL graphicalCoordinates(x, y, SIN((ABS(x) + ABS(y)) / 30) * 30, x1Val, y1Val)
+            PSET (x1Val, y1Val), 15
+        NEXT x
+    NEXT y
+    PCOPY 0, 1
+    CLS
+    inputChar$ = INPUT$(1)
+
+    ' Adjust rotation angles based on user input
+    IF inputChar$ = "7" THEN angleAlpha = angleAlpha + 0.1
+    IF inputChar$ = "9" THEN angleAlpha = angleAlpha - 0.1
+    IF inputChar$ = "4" THEN angleBeta = angleBeta + 0.1
+    IF inputChar$ = "6" THEN angleBeta = angleBeta - 0.1
+    IF inputChar$ = "1" THEN angleGamma = angleGamma + 0.1
+    IF inputChar$ = "3" THEN angleGamma = angleGamma - 0.1
+    IF inputChar$ = CHR$(27) THEN SYSTEM ' Exit program if ESC key is pressed
+LOOP
+
+SUB graphicalCoordinates (xVal AS Single, yVal AS Single, zVal AS Single, x1Val AS Single, y1Val AS Single)
+    ' Perform matrix transformation to rotate coordinates
+    rxVal = xVal * matrixX1 + yVal * matrixY1 + zVal * matrixZ1
+    ryVal = xVal * matrixX2 + yVal * matrixY2 + zVal * matrixZ2
+    rzVal = xVal * matrixX3 + yVal * matrixY3 + zVal * matrixZ3
+
+    ' Apply perspective calculation to give the illusion of depth
+    rzVal = rzVal + 100
+    x1Val = rxVal / rzVal * 120 + 160
+    y1Val = ryVal / rzVal * 120 + 100
+END SUB
+
+SUB setAngles (alphaVal AS Single, betaVal AS Single, gammaVal AS Single)
+    ' Calculate the elements of the rotation matrix based on the angles
+    matrixX1 = SIN(gammaVal) * SIN(betaVal) * SIN(alphaVal) + COS(gammaVal) * COS(alphaVal)
+    matrixY1 = COS(betaVal) * SIN(alphaVal)
+    matrixZ1 = SIN(gammaVal) * COS(alphaVal) - COS(gammaVal) * SIN(betaVal) * SIN(alphaVal)
+
+    matrixX2 = SIN(gammaVal) * SIN(betaVal) * COS(alphaVal) - COS(gammaVal) * SIN(alphaVal)
+    matrixY2 = COS(betaVal) * COS(alphaVal)
+    matrixZ2 = -COS(gammaVal) * SIN(betaVal) * COS(alphaVal) - SIN(gammaVal) * SIN(alphaVal)
+
+    matrixX3 = -SIN(gammaVal) * COS(betaVal)
+    matrixY3 = SIN(betaVal)
+    matrixZ3 = COS(gammaVal) * COS(betaVal)
+END SUB
\ No newline at end of file
diff --git a/3D GFX/Miscellaneous/Matrix math.webm b/3D GFX/Miscellaneous/Matrix math.webm
new file mode 100644
index 0000000..5e6ea9a
Binary files /dev/null and b/3D GFX/Miscellaneous/Matrix math.webm differ
diff --git a/3D GFX/Miscellaneous/Maze explorer.bas b/3D GFX/Miscellaneous/Maze explorer.bas
new file mode 100755
index 0000000..f733f57
--- /dev/null
+++ b/3D GFX/Miscellaneous/Maze explorer.bas	
@@ -0,0 +1,293 @@
+' Evolving 3D Maze explorer.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2003.12, Initial version
+' 2024 - 2025, Improved program readability
+'
+' Navigation:
+'   WASD - move around
+'   Drag mouse - look around
+'   Press left and right mouse buttons simultaneously while dragging mouse - move in X and Z axis
+'   Press right mouse button while dragging mouse - move in Y axis
+'
+' Press 'q' to quit the program
+
+DECLARE SUB verifyTsrIsLoaded ()
+DECLARE SUB startText ()
+DECLARE SUB handleInput ()
+DECLARE SUB putByte (addr!, dat!)
+DECLARE SUB putWord (addr!, dat!)
+DECLARE FUNCTION getWord! (addr!)
+DECLARE FUNCTION getByte! (addr!)
+DECLARE SUB initializeProgram ()
+DECLARE SUB render3DScene ()
+
+DIM SHARED pointX(1 TO 500)
+DIM SHARED pointY(1 TO 500)
+DIM SHARED pointZ(1 TO 500)
+DIM SHARED renderedPointX(1 TO 500)
+DIM SHARED renderedPointY(1 TO 500)
+DIM SHARED renderedPointEnabled(1 TO 500)
+
+DIM SHARED lineStart(1 TO 500)
+DIM SHARED lineEnd(1 TO 500)
+DIM SHARED lineColor(1 TO 500)
+
+DIM SHARED lineCount, pointCount
+
+DIM SHARED angleY, angleX, angleZ
+
+DIM SHARED frameTime
+
+DIM SHARED extensionSegment, extensionAddress
+
+DIM SHARED cameraX, cameraY, cameraZ
+DIM SHARED cameraXSpeed, cameraYSpeed, cameraZSpeed
+DIM SHARED leftMouseButton, rightMouseButton
+DIM SHARED maxMove
+
+lineCount = 0
+pointCount = 0
+
+initializeProgram
+
+' Initialize position variables
+currentX = 0
+currentY = 0
+currentZ = 0
+
+pointCount = 1
+pointX(pointCount) = currentX
+pointY(pointCount) = currentY
+pointZ(pointCount) = currentZ
+
+1
+
+IF pointCount < 500 THEN
+
+  ' Increase the number of points and add a new point at the current position
+  pointCount = pointCount + 1
+  pointX(pointCount) = currentX
+  pointY(pointCount) = currentY
+  pointZ(pointCount) = currentZ
+
+  ' Increase the number of lines and define a line between the new point and the previous one
+  lineCount = lineCount + 1
+  lineStart(lineCount) = pointCount
+  lineEnd(lineCount) = pointCount - 1
+  lineColor(lineCount) = INT(RND * 15) + 1
+
+  ' Randomly choose orientation for the next move
+  SELECT CASE INT(RND * 3)
+  CASE 0
+    currentX = RND * 500 - 250
+  CASE 1
+    currentY = RND * 100 - 50
+  CASE 2
+    currentZ = RND * 500 - 250
+  END SELECT
+END IF
+
+handleInput
+render3DScene
+
+' Copy the current screen to page 1 and clear the screen
+PCOPY 0, 1
+CLS
+GOTO 1
+
+SUB render3DScene
+
+' Calculate sine and cosine for Y-axis rotation
+sinY = SIN(angleY)
+cosY = COS(angleY)
+
+' Calculate sine and cosine for X-axis rotation
+sinX = SIN(angleX)
+cosX = COS(angleX)
+
+' Calculate sine and cosine for Z-axis rotation (not used in current code)
+sinZ = SIN(angleZ)
+cosZ = COS(angleZ)
+
+' Project 3D points to 2D screen coordinates
+FOR a = 1 TO pointCount
+  deltaX = pointX(a) - cameraX
+  deltaY = pointY(a) - cameraY
+  deltaZ = pointZ(a) - cameraZ
+
+  ' Rotate around Y axis
+  rotatedX = deltaX * cosY + deltaZ * sinY
+  rotatedZ = deltaZ * cosY - deltaX * sinY
+
+  ' Rotate around X axis
+  rotatedY = deltaY * cosX + rotatedZ * sinX
+  finalZ = rotatedZ * cosX - deltaY * sinX
+
+  ' Check if the point is in front of the camera (finalZ > 3)
+  IF finalZ > 3 THEN
+    renderedPointEnabled(a) = 1
+    renderedPointX(a) = rotatedX / finalZ * 130 + 160
+    renderedPointY(a) = rotatedY / finalZ * 130 + 100
+  ELSE
+    renderedPointEnabled(a) = 0
+  END IF
+NEXT a
+
+' Draw lines between visible points
+FOR a = 1 TO lineCount
+
+  p1 = lineStart(a)
+  p2 = lineEnd(a)
+  IF (renderedPointEnabled(p1) = 1) AND (renderedPointEnabled(p2) = 1) THEN
+    LINE (renderedPointX(p1), renderedPointY(p1))-(renderedPointX(p2), renderedPointY(p2)), lineColor(a)
+  END IF
+
+NEXT a
+
+END SUB
+
+SUB handleInput
+
+' Read mouse data
+IF getByte(8) <> 0 THEN
+  putByte 8, 0
+  ' Read mouse translation along x axis
+  mouseXDelta = getWord(2)
+  putWord 2, 0
+  ' Read mouse translation along y axis
+  mouseYDelta = getWord(4)
+  putWord 4, 0
+  ' Read pressed mouse buttons
+  button = getWord(6)
+  putWord 6, 0
+
+  ' Detect if left, right or both mouse buttons were pressed
+  leftMouseButton = 0
+  rightMouseButton = 0
+  IF button = 1 THEN leftMouseButton = 1
+  IF button = 2 THEN rightMouseButton = 1
+  IF button = 3 THEN leftMouseButton = 1: rightMouseButton = 1
+
+  IF rightMouseButton = 1 THEN
+    IF leftMouseButton = 1 THEN
+      ' If mouse left and right buttons are pressed at the same time,
+      ' use mouse translation to move avatar around X and Z axis.
+      cameraXSpeed = cameraXSpeed + SIN(angleY) * mouseYDelta / 4
+      cameraZSpeed = cameraZSpeed - COS(angleY) * mouseYDelta / 4
+      GOTO 3
+    END IF
+    ' If only right button is pressed, move around Y axis
+    cameraYSpeed = cameraYSpeed + mouseYDelta / 4
+3
+    mouseYDelta = 0
+  END IF
+
+END IF
+
+' Limit mouse movement to maxMove
+IF mouseXDelta < -maxMove THEN mouseXDelta = -maxMove
+IF mouseXDelta > maxMove THEN mouseXDelta = maxMove
+angleY = angleY - mouseXDelta / 150
+
+IF mouseYDelta < -maxMove THEN mouseYDelta = -maxMove
+IF mouseYDelta > maxMove THEN mouseYDelta = maxMove
+angleX = angleX - mouseYDelta / 150
+
+' Read keyboard input and update player position
+keyInput$ = INKEY$
+
+IF keyInput$ = "a" THEN cameraXSpeed = cameraXSpeed - COS(angleY): cameraZSpeed = cameraZSpeed - SIN(angleY)
+IF keyInput$ = "d" THEN cameraXSpeed = cameraXSpeed + COS(angleY): cameraZSpeed = cameraZSpeed + SIN(angleY)
+IF keyInput$ = "w" THEN cameraXSpeed = cameraXSpeed - SIN(angleY): cameraZSpeed = cameraZSpeed + COS(angleY)
+IF keyInput$ = "s" THEN cameraXSpeed = cameraXSpeed + SIN(angleY): cameraZSpeed = cameraZSpeed - COS(angleY)
+IF keyInput$ = "q" THEN SYSTEM
+
+' Apply friction to player movement
+cameraXSpeed = cameraXSpeed / 1.1
+cameraYSpeed = cameraYSpeed / 1.1
+cameraZSpeed = cameraZSpeed / 1.1
+
+' Update player position
+cameraX = cameraX + cameraXSpeed
+cameraZ = cameraZ + cameraZSpeed
+cameraY = cameraY + cameraYSpeed
+
+END SUB
+
+FUNCTION getByte (addr)
+getByte = PEEK(extensionAddress + addr)
+END FUNCTION
+
+FUNCTION getWord (addr)
+a = PEEK(extensionAddress + addr)
+b = PEEK(extensionAddress + addr + 1)
+
+' Convert bytes to a hex string and then to an integer
+c$ = HEX$(a)
+IF LEN(c$) = 1 THEN c$ = "0" + c$
+IF LEN(c$) = 0 THEN c$ = "00"
+
+c = VAL("&H" + HEX$(b) + c$)
+
+getWord = c
+END FUNCTION
+
+SUB putByte (addr, dat)
+POKE (extensionAddress + addr), dat
+END SUB
+
+SUB putWord (addr, dat)
+
+b$ = HEX$(dat)
+
+2
+IF LEN(b$) < 4 THEN b$ = "0" + b$: GOTO 2
+
+n1 = VAL("&H" + LEFT$(b$, 2))
+n2 = VAL("&H" + RIGHT$(b$, 2))
+
+POKE (extensionAddress + addr), n2
+POKE (extensionAddress + addr + 1), n1
+
+END SUB
+
+SUB initializeProgram
+verifyTsrIsLoaded
+
+SCREEN 7, , , 1
+
+' Set camera speed limit
+maxMove = 50
+
+END SUB
+
+SUB verifyTsrIsLoaded
+
+DEF SEG = 0     ' Read first from interrupt table
+
+extensionSegment = PEEK(&H79 * 4 + 3) * 256
+extensionSegment = extensionSegment + PEEK(&H79 * 4 + 2)
+
+PRINT "Segment is: " + HEX$(extensionSegment)
+
+extensionAddress = PEEK(&H79 * 4 + 1) * 256
+extensionAddress = extensionAddress + PEEK(&H79 * 4 + 0)
+
+PRINT "relative address is:"; extensionAddress
+
+DEF SEG = extensionSegment
+
+' Verify TSR signature
+IF getWord(0) <> 1983 THEN
+  PRINT "FATAL ERROR:  you must load"
+  PRINT "QBasic extension TSR first!"
+  SYSTEM
+END IF
+
+END SUB
diff --git a/3D GFX/Miscellaneous/Maze explorer.png b/3D GFX/Miscellaneous/Maze explorer.png
new file mode 100644
index 0000000..96348a3
Binary files /dev/null and b/3D GFX/Miscellaneous/Maze explorer.png differ
diff --git a/3D GFX/Miscellaneous/Tank.bas b/3D GFX/Miscellaneous/Tank.bas
new file mode 100755
index 0000000..479e421
--- /dev/null
+++ b/3D GFX/Miscellaneous/Tank.bas	
@@ -0,0 +1,800 @@
+' Program to render animated 3D tank driving back and forth on a 3D bridge
+' Tank tracks are synchronized with movement. Free camera navigation available.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2000, Initial version
+' 2024 - 2025, Improved code readability
+'
+' Controls:
+' Arrow keys - Look around
+' +/- - Move forward/backward
+' Q - Quit
+' Space - Stop movement
+
+DECLARE SUB InitializeProgram ()
+DECLARE SUB SavePosition (x1%, y1%, x2%, y3%)
+DECLARE SUB LoadBridgeGeometry ()
+DECLARE SUB UpdateTankTracks ()
+DECLARE SUB InitializeTrackSegments ()
+DECLARE SUB GetTrackSegmentPoints (x1%, y1%, x2%, Y2%)
+DECLARE SUB DisplayText ()
+DECLARE SUB LoadInitialGeometry ()
+DECLARE SUB MultiplyCoordinates ()
+DECLARE SUB RenderSceneLoop ()
+DECLARE SUB PrecomputeTrigTables ()
+
+DEFINT A-Y
+' Screen coordinate arrays for projected points
+DIM SHARED screenX(1000), screenY(1000), depthZ(1000)
+' World space coordinates for all 3D points
+DIM SHARED worldPointX(2000), worldPointY(2000), worldPointZ(2000)
+' Previous frame's rotated point coordinates for motion trails
+DIM SHARED prevStartX(1000), prevStartY(1000), prevEndX(1000), prevEndY(1000)
+' Line connections between points
+DIM SHARED lineStartIndex(1000), lineEndIndex(1000)
+' Precomputed sine/cosine tables for fast rotation calculations
+DIM SHARED precomputedCosine&(360), precomputedSine&(360)
+DIM SHARED totalPoints, totalLines
+
+' Track system arrays and counters
+DIM SHARED trackX(1 TO 3000)
+DIM SHARED trackY(1 TO 3000)
+DIM SHARED trackSegmentCount
+DIM SHARED currentTrackSegmentIndex
+
+' Geometry pointers for different object types
+DIM SHARED trackStartPointIndex ' Point index for first track segment
+DIM SHARED trackStartLineIndex   ' Line index for first track segment
+DIM SHARED bridgeStartPointIndex ' Point index for bridge geometry
+DIM SHARED bridgeStartLineIndex  ' Line index for bridge geometry
+
+' Tank position tracking
+DIM SHARED tracksXOffset
+DIM SHARED tankPosX, tankPosY, tankPosZ
+DIM SHARED previousTankPosX, previousTankPosY, previousTankPosZZ
+
+' Camera rotation angles in degrees
+DIM SHARED yawRotationDeg, pitchRotationDeg, rollRotationDeg
+DIM SHARED movementSpeed
+
+DIM SHARED tankMovementDirection
+
+InitializeProgram
+RenderSceneLoop
+
+' 3D Model Data Section
+' Contains coordinates for:
+' - Tank body
+' - Bridge structure
+' - Connection lines between points
+DATA -10,-30,-20
+DATA 30,-30,-20
+DATA 30,-10,-20
+DATA -10,-10,-20
+
+DATA -10,-30,20
+DATA 30,-30,20
+DATA 30,-10,20
+DATA -10,-10,20
+
+DATA -10,-40,-15
+DATA 30,-40,-15
+DATA -10,-40,15
+DATA 30,-40,15
+
+DATA -20,-30,-15
+DATA -20,-30, 15
+
+DATA -70,-10,-50
+DATA 60,-10, -50
+DATA 70,  0, -50
+DATA 70, 20, -50
+DATA 60, 30, -50
+DATA -70,30, -50
+DATA -80,20, -50
+DATA -80, 0, -50
+
+DATA -70,-10,-30
+DATA 60,-10, -30
+DATA 70,  0, -30
+DATA 70, 20, -30
+DATA 60, 30, -30
+DATA -70,30, -30
+DATA -80,20, -30
+DATA -80, 0, -30
+
+DATA -70,-10, 50
+DATA 60,-10,  50
+DATA 70,  0,  50
+DATA 70, 20,  50
+DATA 60, 30,  50
+DATA -70,30,  50
+DATA -80,20,  50
+DATA -80, 0,  50
+
+DATA -70,-10, 30
+DATA 60,-10,  30
+DATA 70,  0,  30
+DATA 70, 20,  30
+DATA 60, 30,  30
+DATA -70,30,  30
+DATA -80,20,  30
+DATA -80, 0,  30
+
+DATA -50,-7,-30
+DATA  50,-7,-30
+DATA  50, 15,-30
+DATA -50, 15,-30
+
+DATA -50,-7, 30
+DATA  50,-7, 30
+DATA  50, 15,30
+DATA -50, 15,30
+
+DATA -20,-20,-5
+DATA -20,-20, 5
+DATA -20,-30, 5
+DATA -20,-30,-5
+
+DATA -100,-30,-5
+DATA -100,-30, 5
+DATA -100,-40, 5
+DATA -100,-40,-5
+
+DATA 999,999,999
+
+DATA 0,1
+DATA 1,2
+DATA 2,3
+DATA 3,0
+
+DATA 4,5
+DATA 5,6
+DATA 6,7
+DATA 7,4
+
+DATA 0,8
+DATA 1,9
+DATA 4,10
+DATA 5,11
+
+DATA 0,12
+DATA 4,13
+DATA 12,8
+DATA 13,10
+
+DATA 8,9
+DATA 10,11
+DATA 8,10
+DATA 9,11
+
+DATA 12,13
+DATA 12,3
+DATA 13,7
+DATA 3,7
+DATA 1,5
+DATA 2,6
+
+DATA 14,15
+DATA 15,16
+DATA 16,17
+DATA 17,18
+DATA 18,19
+DATA 19,20
+DATA 20,21
+DATA 21,14
+
+DATA 22,23
+DATA 23,24
+DATA 24,25
+DATA 25,26
+DATA 26,27
+DATA 27,28
+DATA 28,29
+DATA 29,22
+
+DATA 30,31
+DATA 31,32
+DATA 32,33
+DATA 33,34
+DATA 34,35
+DATA 35,36
+DATA 36,37
+DATA 37,30
+
+DATA 38,39
+DATA 39,40
+DATA 40,41
+DATA 41,42
+DATA 42,43
+DATA 43,44
+DATA 44,45
+DATA 45,38
+
+DATA 46,47
+DATA 47,48
+DATA 48,49
+DATA 49,46
+
+DATA 50,51
+DATA 51,52
+DATA 52,53
+DATA 53,50
+
+DATA 50,46
+DATA 51,47
+DATA 52,48
+DATA 53,49
+
+DATA 54,55
+DATA 55,56
+DATA 56,57
+DATA 57,54
+
+DATA 54,58
+DATA 55,59
+DATA 56,60
+DATA 57,61
+
+DATA 58,59
+DATA 59,60
+DATA 60,61
+DATA 61,58
+
+DATA 54,3
+DATA 55,7
+
+DATA 999, 999
+'                                                          BRIDGE
+'                                                 right handlebars
+DATA 100,0,100
+DATA 100,50,100
+
+DATA 50,0,100
+DATA 50,50,100
+
+DATA 0,0,100
+DATA 0,50,100
+
+DATA -50,0,100
+DATA -50,50,100
+
+DATA -100,0,100
+DATA -100,50,100
+                       ' 5
+DATA -150,0,100
+DATA -150,50,100
+
+DATA -200,0,100
+DATA -200,50,100
+
+DATA -250,0,100
+DATA -250,50,100
+
+DATA -300,0,100
+DATA -300,50,100
+
+DATA -350,0,100
+DATA -350,50,100
+                           ' 10
+
+DATA -400,0,100
+DATA -400,50,100
+
+DATA -450,0,100
+DATA -450,50,100
+
+DATA -500,0,100
+DATA -500,50,100
+
+DATA -550,0,100
+DATA -550,50,100
+
+DATA -600,0,100
+DATA -600,50,100
+
+DATA -650,0,100
+DATA -650,50,100
+
+                    ' left handlebars
+DATA 100,0,-100
+DATA 100,50,-100
+
+DATA 50,0,-100
+DATA 50,50,-100
+
+DATA 0,0,-100
+DATA 0,50,-100
+
+DATA -50,0,-100
+DATA -50,50,-100
+
+DATA -100,0,-100
+DATA -100,50,-100
+                       ' 5
+DATA -150,0,-100
+DATA -150,50,-100
+
+DATA -200,0,-100
+DATA -200,50,-100
+
+DATA -250,0,-100
+DATA -250,50,-100
+
+DATA -300,0,-100
+DATA -300,50,-100
+
+DATA -350,0,-100
+DATA -350,50,-100
+                           ' 10
+
+DATA -400,0,-100
+DATA -400,50,-100
+
+DATA -450,0,-100
+DATA -450,50,-100
+
+DATA -500,0,-100
+DATA -500,50,-100
+
+DATA -550,0,-100
+DATA -550,50,-100
+
+DATA -600,0,-100
+DATA -600,50,-100
+
+DATA -650,0,-100
+DATA -650,50,-100
+                '   bottom line
+DATA 100,75,-100
+DATA -650,75,-100
+
+DATA 100,75,100
+DATA -650,75,100
+                ' shore
+DATA 75,75,-100
+DATA 75,75,100
+                   'right
+DATA -50,200,-100
+DATA -50,200,100
+
+DATA  75,200,-190
+DATA  75,200, 190
+                   'left
+DATA -525,200,-100
+DATA -525,200, 100
+
+DATA -600,200,-190
+DATA -600,200, 190
+
+'
+
+DATA 999,999,999
+
+                 'right handlebars
+
+DATA 2,3
+DATA 4,5
+DATA 6,7
+DATA 8,9
+
+DATA 10,11
+DATA 12,13
+DATA 14,15
+DATA 16,17
+DATA 18,19
+
+DATA 20,21
+DATA 22,23
+DATA 24,25
+DATA 26,27
+DATA 28,29
+
+
+                   'left handlebars
+DATA 34,35
+DATA 36,37
+DATA 38,39
+DATA 40,41
+
+DATA 42,43
+DATA 44,45
+DATA 46,47
+DATA 48,49
+DATA 50,51
+
+DATA 52,53
+DATA 54,55
+DATA 56,57
+DATA 58,59
+DATA 60,61
+
+'          long features
+DATA 0,4
+DATA 4,8
+DATA 8,12
+DATA 12,16
+DATA 16,20
+DATA 20,24
+DATA 24,28
+DATA 28,30
+
+DATA 1,5
+DATA 5,9
+DATA 9,13
+DATA 13,17
+DATA 17,21
+DATA 21,25
+DATA 25,29
+DATA 29,31
+
+DATA 32,36
+DATA 36,40
+DATA 40,44
+DATA 44,48
+DATA 48,52
+DATA 52,56
+DATA 56,60
+DATA 60,62
+
+DATA 33,37
+DATA 37,41
+DATA 41,45
+DATA 45,49
+DATA 49,53
+DATA 53,57
+DATA 57,61
+DATA 61,63
+
+'
+
+'  end
+
+DATA 1,33
+DATA 31,63
+
+DATA 64,65
+DATA 66,67
+DATA 64,66
+DATA 65,67
+
+DATA 0,66
+DATA 32,64
+DATA 30,67
+DATA 62,65
+            ' shore
+DATA 68,69
+DATA 70,71
+DATA 68,70
+DATA 69,71
+
+DATA 72,70
+DATA 72,68
+
+DATA 73,71
+DATA 73,69
+           'left
+DATA 74,76
+DATA 75,77
+DATA 74,75
+
+DATA 74,65
+DATA 76,65
+
+DATA 75,67
+DATA 77,67
+
+DATA 999, 999
+
+SUB GetTrackSegmentPoints (startX%, startY%, endX%, endY%)
+' Calculates evenly spaced points along a straight line between two coordinates
+' Used to create smooth tank track paths
+dx = ABS(startX - endX)
+dy = ABS(endY - startY)
+length = SQR(dx ^ 2 + dy ^ 2) * 1.017142857#
+
+' Calculate direction vectors
+directionX = (startX - endX) / length
+directionY = (endY - startY) / length
+
+currentX = startX%
+currentY = startY%
+
+FOR segment = 1 TO length
+    currentX = currentX - directionX
+    currentY = currentY + directionY
+    trackX(trackSegmentCount) = currentX
+    trackY(trackSegmentCount) = currentY
+    trackSegmentCount = trackSegmentCount + 1
+NEXT segment
+
+END SUB
+
+SUB InitializeProgram
+' Sets up initial program state and loads geometry
+SCREEN 12
+CLS
+movementSpeed = 0
+
+yawRotationDeg = 210
+pitchRotationDeg = 20
+rollRotationDeg = 90
+
+currentTrackSegmentIndex = 1
+tracksXOffset = 0
+
+previousTankPosX = 0
+previousTankPosY = 0
+previousTankPosZZ = 0
+tankPosX = 0
+tankPosY = -300
+tankPosZ = 100
+currentTrackSegmentIndex = 1
+
+tankMovementDirection = 1
+
+PrecomputeTrigTables
+LoadInitialGeometry
+LoadBridgeGeometry
+InitializeTrackSegments
+
+END SUB
+
+SUB InitializeTrackSegments
+' Sets up predefined track path segments connecting key points on the tank chassis
+trackSegmentCount = 1
+GetTrackSegmentPoints -70, -10, -80, 0
+GetTrackSegmentPoints -80, 0, -80, 20
+GetTrackSegmentPoints -80, 20, -70, 30
+GetTrackSegmentPoints -70, 30, 60, 30
+GetTrackSegmentPoints 60, 30, 70, 20
+GetTrackSegmentPoints 70, 20, 70, 0
+GetTrackSegmentPoints 70, 0, 60, -10
+GetTrackSegmentPoints 60, -10, -70, -10
+
+END SUB
+
+SUB LoadBridgeGeometry
+' Loads bridge geometry from DATA statements and adjusts indices
+bridgeStartLineIndex = totalLines
+bridgeStartPointIndex = totalPoints
+
+ReadNextPoint:
+READ worldPointX(totalPoints), worldPointY(totalPoints), worldPointZ(totalPoints)
+IF worldPointX(totalPoints) = 999 THEN
+    worldPointX(totalPoints) = 0: worldPointY(totalPoints) = 0: worldPointZ(totalPoints) = 0: GOTO FoundEndOfBridgePoints
+END IF
+totalPoints = totalPoints + 1
+GOTO ReadNextPoint
+
+FoundEndOfBridgePoints:
+ReadNextLine:
+READ lineStartIndex(totalLines), lineEndIndex(totalLines)
+IF lineStartIndex(totalLines) = 999 THEN GOTO EndOfBridgeLines
+lineStartIndex(totalLines) = lineStartIndex(totalLines) + bridgeStartPointIndex
+lineEndIndex(totalLines) = lineEndIndex(totalLines) + bridgeStartPointIndex
+totalLines = totalLines + 1
+GOTO ReadNextLine
+
+EndOfBridgeLines:
+
+END SUB
+
+SUB LoadInitialGeometry
+' Loads all 3D model vertices and connection lines from DATA statements
+FOR pointIndex = 0 TO 10000
+    READ worldPointX(pointIndex), worldPointY(pointIndex), worldPointZ(pointIndex)
+    IF worldPointX(pointIndex) = 999 THEN
+        worldPointX(pointIndex) = 0: worldPointY(pointIndex) = 0: worldPointZ(pointIndex) = 0: GOTO FoundEndOfPoints
+    END IF
+NEXT
+
+FoundEndOfPoints:
+totalPoints = pointIndex
+
+FOR lineIndex = 0 TO 10000
+    READ lineStartIndex(lineIndex), lineEndIndex(lineIndex)
+    IF lineStartIndex(lineIndex) = 999 THEN GOTO FoundEndOfLines
+NEXT
+
+FoundEndOfLines:
+totalLines = lineIndex
+
+' Save starting indices for different object types
+trackStartPointIndex = totalPoints
+trackStartLineIndex = totalLines
+
+' Initialize space for track segments
+FOR segmentIndex = 1 TO 48
+    lineStartIndex(totalLines) = totalPoints
+    totalPoints = totalPoints + 1
+    lineEndIndex(totalLines) = totalPoints
+    totalPoints = totalPoints + 1
+    totalLines = totalLines + 1
+NEXT segmentIndex
+
+END SUB
+
+SUB PrecomputeTrigTables
+' Precomputes sine and cosine values for 0-360 degrees
+' Values are scaled by 1024 to maintain precision with integer math
+FOR angleRadians! = 0 TO 359 / 57.29577950999997# STEP 1 / 57.29577950999997#
+    precomputedCosine&(angle) = INT(.5 + COS(angleRadians!) * 1024)
+    precomputedSine&(angle) = INT(.5 + SIN(angleRadians!) * 1024)
+    angle = angle + 1
+NEXT
+CLS
+END SUB
+
+SUB RenderSceneLoop
+' Main rendering loop with camera controls and 3D projection
+DO
+    ' Update animated tank tracks
+    UpdateTankTracks
+
+    ' Apply rotation deltas to camera angles
+    yawRotationDeg = yawRotationDeg + rotationDeltaYaw
+    pitchRotationDeg = pitchRotationDeg + rotationDeltaPitch
+    rollRotationDeg = rollRotationDeg + rotationDeltaRoll
+
+    ' Keep angles within 0-360 degree range
+    IF yawRotationDeg <= 0 THEN yawRotationDeg = yawRotationDeg + 360
+    IF pitchRotationDeg <= 0 THEN pitchRotationDeg = pitchRotationDeg + 360
+    IF rollRotationDeg <= 0 THEN rollRotationDeg = rollRotationDeg + 360
+
+    IF yawRotationDeg >= 360 THEN yawRotationDeg = yawRotationDeg - 360
+    IF pitchRotationDeg >= 360 THEN pitchRotationDeg = pitchRotationDeg - 360
+    IF rollRotationDeg >= 360 THEN rollRotationDeg = rollRotationDeg - 360
+
+    ' Lookup precomputed trig values
+    cosYaw& = precomputedCosine&(yawRotationDeg)
+    sinYaw& = precomputedSine&(yawRotationDeg)
+    cosPitch& = precomputedCosine&(pitchRotationDeg)
+    sinPitch& = precomputedSine&(pitchRotationDeg)
+    cosRoll& = precomputedCosine&(rollRotationDeg)
+    sinRoll& = precomputedSine&(rollRotationDeg)
+
+    ' Update tank position based on movement speed
+    tankPosX = tankPosX - (sinYaw& * movementSpeed / 100)
+    tankPosY = tankPosY - (cosYaw& * movementSpeed / 100)
+    tankPosZ = tankPosZ - (sinPitch& * movementSpeed / 100)
+
+    ' Transform all points through rotation matrices
+    FOR pointIndex = 0 TO totalPoints - 1
+        ' Translate point by tank position
+        worldX = worldPointX(pointIndex) + tankPosX
+        worldY = worldPointY(pointIndex) + tankPosZ
+        worldZ = worldPointZ(pointIndex) + tankPosY
+
+        ' Apply Yaw rotation (around Y axis)
+        rotatedX = (worldX * cosYaw& - worldZ * sinYaw&) \ 1024
+        rotatedZ = (worldX * sinYaw& + worldZ * cosYaw&) \ 1024
+
+        ' Apply Pitch rotation (around X axis)
+        rotatedY = (worldY * cosPitch& - rotatedZ * sinPitch&) \ 1024
+        finalZ = (worldY * sinPitch& + rotatedZ * cosPitch&) \ 1024
+
+        ' Apply Roll rotation (around Z axis)
+        screenXCoord = (rotatedY * cosRoll& - rotatedX * sinRoll&) \ 1024
+        screenYCoord = (rotatedY * sinRoll& + rotatedX * cosRoll&) \ 1024
+
+        ' Perspective projection if point is in front of camera
+        IF finalZ > 10 THEN
+            screenX(pointIndex) = 320 + (screenXCoord / finalZ * 500)
+            screenY(pointIndex) = 240 + (screenYCoord / finalZ * 500)
+        ELSE
+            screenX(pointIndex) = -1
+        END IF
+    NEXT
+
+    ' Draw all connected lines
+    FOR lineIndex = 0 TO totalLines - 1
+        firstPoint = lineStartIndex(lineIndex)
+        secondPoint = lineEndIndex(lineIndex)
+
+        startX = screenX(firstPoint)
+        startY = screenY(firstPoint)
+        endX = screenX(secondPoint)
+        endY = screenY(secondPoint)
+
+        ' Erase previous frame's line if it was visible
+        IF prevStartX(lineIndex) <> -1 AND prevEndX(lineIndex) <> -1 THEN
+            LINE (prevStartX(lineIndex), prevStartY(lineIndex))-(prevEndX(lineIndex), prevEndY(lineIndex)), 0
+        END IF
+
+        ' Draw new line if both points are visible
+        IF endX <> -1 AND startX <> -1 THEN
+            LINE (endX, endY)-(startX, startY), 15
+        END IF
+
+        ' Save current coordinates for next frame
+        prevStartX(lineIndex) = endX
+        prevStartY(lineIndex) = endY
+        prevEndX(lineIndex) = startX
+        prevEndY(lineIndex) = startY
+    NEXT
+
+    ' Handle user input
+    keyInput$ = INKEY$
+    IF keyInput$ <> "" THEN
+        SELECT CASE keyInput$
+            ' Camera rotation controls
+            CASE CHR$(0) + "M" ' Right arrow
+                rotationDeltaYaw = rotationDeltaYaw - 1
+            CASE CHR$(0) + "K" ' Left arrow
+                rotationDeltaYaw = rotationDeltaYaw + 1
+            CASE CHR$(0) + "P" ' Down arrow
+                rotationDeltaPitch = rotationDeltaPitch + 1
+            CASE CHR$(0) + "H" ' Up arrow
+                rotationDeltaPitch = rotationDeltaPitch - 1
+            CASE "w" ' W key
+                rotationDeltaRoll = rotationDeltaRoll - 1
+            CASE "z" ' Z key
+                rotationDeltaRoll = rotationDeltaRoll + 1
+
+            ' Movement controls
+            CASE "-"
+                movementSpeed = movementSpeed - 1
+            CASE "+"
+                movementSpeed = movementSpeed + 1
+            CASE " " ' Spacebar
+                rotationDeltaYaw = 0: rotationDeltaPitch = 0: rotationDeltaRoll = 0
+                movementSpeed = 0
+            CASE CHR$(27) ' Escape key
+                SYSTEM
+        END SELECT
+    END IF
+LOOP
+END SUB
+
+SUB UpdateTankTracks
+
+' Animates tank tracks by cycling through predefined track segments
+tracksXOffset = tracksXOffset + tankMovementDirection
+currentTrackSegmentIndex = currentTrackSegmentIndex + tankMovementDirection
+
+' Wrap segment index at boundaries
+IF currentTrackSegmentIndex > 15 THEN currentTrackSegmentIndex = 1
+IF currentTrackSegmentIndex < 1 THEN currentTrackSegmentIndex = 15
+
+segmentIndex = currentTrackSegmentIndex
+
+' Update right-side track positions
+FOR pointIndex = trackStartPointIndex TO trackStartPointIndex + 48 STEP 2
+    worldPointX(pointIndex) = trackX(segmentIndex) - tracksXOffset
+    worldPointY(pointIndex) = trackY(segmentIndex)
+    worldPointZ(pointIndex) = 50
+    worldPointX(pointIndex + 1) = trackX(segmentIndex) - tracksXOffset
+    worldPointY(pointIndex + 1) = trackY(segmentIndex)
+    worldPointZ(pointIndex + 1) = 30
+    segmentIndex = segmentIndex + 15
+NEXT
+
+segmentIndex = currentTrackSegmentIndex
+
+' Update left-side track positions
+FOR pointIndex = trackStartPointIndex + 48 TO trackStartPointIndex + 94 STEP 2
+    worldPointX(pointIndex) = trackX(segmentIndex) - tracksXOffset
+    worldPointY(pointIndex) = trackY(segmentIndex)
+    worldPointZ(pointIndex) = -50
+    worldPointX(pointIndex + 1) = trackX(segmentIndex) - tracksXOffset
+    worldPointY(pointIndex + 1) = trackY(segmentIndex)
+    worldPointZ(pointIndex + 1) = -30
+    segmentIndex = segmentIndex + 15
+NEXT
+
+' Move entire tank back and forth when hitting boundaries
+FOR pointIndex = 0 TO 84
+    worldPointX(pointIndex) = worldPointX(pointIndex) - tankMovementDirection
+NEXT
+
+IF worldPointX(84) > 0 THEN tankMovementDirection = 1
+IF worldPointX(83) < -400 THEN tankMovementDirection = -1
+
+END SUB
+
diff --git a/3D GFX/Miscellaneous/Tank.webm b/3D GFX/Miscellaneous/Tank.webm
new file mode 100644
index 0000000..4d5e603
Binary files /dev/null and b/3D GFX/Miscellaneous/Tank.webm differ
diff --git a/3D GFX/Miscellaneous/Tiled room.bas b/3D GFX/Miscellaneous/Tiled room.bas
new file mode 100755
index 0000000..24e3224
--- /dev/null
+++ b/3D GFX/Miscellaneous/Tiled room.bas	
@@ -0,0 +1,502 @@
+' Program renders 3D room with various decorative tiles on the wall and on the floor.
+' User can freely fly around and look at the room from different angles.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' ?, Initial version
+' 2024, Improved program readability
+'
+' Keyboard controls:
+' <left>, <right>, <up>, <down> - move around
+' 2, 6, 4, 8 - look around (number pad)
+' <SPACE> - speed down
+' q - quit
+' + / - - move up / down
+'
+
+
+DECLARE SUB renderSquare2 (x!, y!, z!, s!)
+DECLARE SUB renderSquare (x%, y%, z%, s%)
+DECLARE SUB renderHexagon (x!, y!, z!, s!)
+DECLARE SUB generateCube ()
+
+DECLARE SUB start ()
+DECLARE SUB addSquare (x1%, y1%, z1%)
+DECLARE SUB getCornerVertices ()
+DECLARE SUB multiplyCoordinates ()
+DECLARE SUB calculateSine ()
+DIM SHARED xVertex(4000), yVertex(4000), zVertex(4000)
+DIM SHARED xCoordinate(4000), yCoordinate(4000), zCoordinate(4000)
+
+DIM SHARED xOriginal(4000), yOriginal(4000), zOriginal(4000)
+DIM SHARED point1Vertex(4000), point2Vertex(4000)
+DIM SHARED col(4000)
+DIM SHARED vertexCount, edgeCount
+DIM SHARED myx, myy, myz, mye, myk
+
+myx = 0
+myy = 0
+myz = -1000
+
+start
+
+nait3d
+
+SUB addSquare (x1%, y1%, z1%)
+    c = 1
+
+    ' Define the vertices of a square in 3D space
+    xVertex(vertexCount + 1) = -100 + x1
+    yVertex(vertexCount + 1) = y1
+    zVertex(vertexCount + 1) = -100 + z1
+
+    xVertex(vertexCount + 2) = 100 + x1
+    yVertex(vertexCount + 2) = y1
+    zVertex(vertexCount + 2) = -100 + z1
+
+    xVertex(vertexCount + 3) = 100 + x1
+    yVertex(vertexCount + 3) = y1
+    zVertex(vertexCount + 3) = 100 + z1
+
+    xVertex(vertexCount + 4) = -100 + x1
+    yVertex(vertexCount + 4) = y1
+    zVertex(vertexCount + 4) = 100 + z1
+
+    ' Define the edges of the square
+    point1Vertex(edgeCount + 1) = vertexCount + 1
+    point2Vertex(edgeCount + 1) = vertexCount + 2
+    col(edgeCount + 1) = c
+
+    point1Vertex(edgeCount + 2) = vertexCount + 2
+    point2Vertex(edgeCount + 2) = vertexCount + 3
+    col(edgeCount + 2) = c
+
+    point1Vertex(edgeCount + 3) = vertexCount + 3
+    point2Vertex(edgeCount + 3) = vertexCount + 4
+    col(edgeCount + 3) = c
+
+    point1Vertex(edgeCount + 4) = vertexCount + 4
+    point2Vertex(edgeCount + 4) = vertexCount + 1
+    col(edgeCount + 4) = c
+
+    ' Update the counters for the next square
+    vertexCount = vertexCount + 4
+    edgeCount = edgeCount + 4
+
+END SUB
+
+SUB getCornerVertices
+
+    ' Define the vertices of a square in 3D space
+    xVertex(vertexCount + 1) = -150
+    yVertex(vertexCount + 1) = -125
+    zVertex(vertexCount + 1) = -200
+
+    xVertex(vertexCount + 2) = 150
+    yVertex(vertexCount + 2) = -125
+    zVertex(vertexCount + 2) = -200
+
+    xVertex(vertexCount + 3) = 150
+    yVertex(vertexCount + 3) = 125
+    zVertex(vertexCount + 3) = -200
+
+    xVertex(vertexCount + 4) = -150
+    yVertex(vertexCount + 4) = 125
+    zVertex(vertexCount + 4) = -200
+
+    ' Define the edges of the square
+    point1Vertex(edgeCount + 1) = vertexCount + 1
+    point2Vertex(edgeCount + 1) = vertexCount + 2
+
+    point1Vertex(edgeCount + 2) = vertexCount + 2
+    point2Vertex(edgeCount + 2) = vertexCount + 3
+
+    point1Vertex(edgeCount + 3) = vertexCount + 3
+    point2Vertex(edgeCount + 3) = vertexCount + 4
+
+    point1Vertex(edgeCount + 4) = vertexCount + 4
+    point2Vertex(edgeCount + 4) = vertexCount + 1
+
+    ' Define the vertices of another square in 3D space
+    xVertex(vertexCount + 5) = -150
+    yVertex(vertexCount + 5) = -125
+    zVertex(vertexCount + 5) = 200
+
+    xVertex(vertexCount + 6) = 150
+    yVertex(vertexCount + 6) = -125
+    zVertex(vertexCount + 6) = 200
+
+    xVertex(vertexCount + 7) = 150
+    yVertex(vertexCount + 7) = 125
+    zVertex(vertexCount + 7) = 200
+
+    xVertex(vertexCount + 8) = -150
+    yVertex(vertexCount + 8) = 125
+    zVertex(vertexCount + 8) = 200
+
+    ' Define the edges of the second square
+    point1Vertex(edgeCount + 5) = vertexCount + 5
+    point2Vertex(edgeCount + 5) = vertexCount + 6
+
+    point1Vertex(edgeCount + 6) = vertexCount + 6
+    point2Vertex(edgeCount + 6) = vertexCount + 7
+
+    point1Vertex(edgeCount + 7) = vertexCount + 7
+    point2Vertex(edgeCount + 7) = vertexCount + 8
+
+    point1Vertex(edgeCount + 8) = vertexCount + 8
+    point2Vertex(edgeCount + 8) = vertexCount + 5
+
+    ' Define the edges connecting the two squares into cube
+    point1Vertex(edgeCount + 9) = vertexCount + 5
+    point2Vertex(edgeCount + 9) = vertexCount + 1
+
+    point1Vertex(edgeCount + 10) = vertexCount + 6
+    point2Vertex(edgeCount + 10) = vertexCount + 2
+
+    point1Vertex(edgeCount + 11) = vertexCount + 7
+    point2Vertex(edgeCount + 11) = vertexCount + 3
+
+    point1Vertex(edgeCount + 12) = vertexCount + 8
+    point2Vertex(edgeCount + 12) = vertexCount + 4
+
+    ' Update the counters for the next set of vertices and edges
+    vertexCount = vertexCount + 8
+    edgeCount = edgeCount + 12
+
+    ' Define a pyramid in 3D space
+    xVertex(vertexCount + 1) = -150
+    yVertex(vertexCount + 1) = -125 + 201
+    zVertex(vertexCount + 1) = 0
+
+    xVertex(vertexCount + 2) = -150
+    yVertex(vertexCount + 2) = -125 + 201
+    zVertex(vertexCount + 2) = 89
+
+    xVertex(vertexCount + 3) = -150
+    yVertex(vertexCount + 3) = -125
+    zVertex(vertexCount + 3) = 89
+
+    xVertex(vertexCount + 4) = -150
+    yVertex(vertexCount + 4) = -125
+    zVertex(vertexCount + 4) = 0
+
+    ' Define the edges of the pyramid
+    point1Vertex(edgeCount + 1) = vertexCount + 1
+    point2Vertex(edgeCount + 1) = vertexCount + 2
+
+    point1Vertex(edgeCount + 2) = vertexCount + 2
+    point2Vertex(edgeCount + 2) = vertexCount + 3
+
+    point1Vertex(edgeCount + 3) = vertexCount + 3
+    point2Vertex(edgeCount + 3) = vertexCount + 4
+
+    point1Vertex(edgeCount + 4) = vertexCount + 4
+    point2Vertex(edgeCount + 4) = vertexCount + 1
+
+    ' Update the counters for the next set of vertices and edges
+    vertexCount = vertexCount + 4
+    edgeCount = edgeCount + 4
+
+porand
+
+END SUB
+
+SUB renderHexagon (x, y, z, s)
+
+b = 0
+f = .3925
+' Calculate the vertices of a hexagon in 3D space
+FOR a = 0 + f TO 6 + f STEP 6.28 / 8
+    x1 = SIN(a) * s
+    y1 = COS(a) * s
+    b = b + 1
+
+    xVertex(vertexCount + b) = x + x1
+    yVertex(vertexCount + b) = y
+    zVertex(vertexCount + b) = z + y1
+
+NEXT a
+
+' Define the edges of the hexagon
+point1Vertex(edgeCount + 1) = vertexCount + 1
+point2Vertex(edgeCount + 1) = vertexCount + 2
+col(edgeCount + 1) = 12
+
+point1Vertex(edgeCount + 2) = vertexCount + 2
+point2Vertex(edgeCount + 2) = vertexCount + 3
+col(edgeCount + 2) = 12
+
+point1Vertex(edgeCount + 3) = vertexCount + 3
+point2Vertex(edgeCount + 3) = vertexCount + 4
+col(edgeCount + 3) = 12
+
+point1Vertex(edgeCount + 4) = vertexCount + 4
+point2Vertex(edgeCount + 4) = vertexCount + 5
+col(edgeCount + 4) = 12
+
+point1Vertex(edgeCount + 5) = vertexCount + 5
+point2Vertex(edgeCount + 5) = vertexCount + 6
+col(edgeCount + 5) = 12
+
+point1Vertex(edgeCount + 6) = vertexCount + 6
+point2Vertex(edgeCount + 6) = vertexCount + 7
+col(edgeCount + 6) = 12
+
+point1Vertex(edgeCount + 7) = vertexCount + 7
+point2Vertex(edgeCount + 7) = vertexCount + 8
+col(edgeCount + 7) = 12
+
+point1Vertex(edgeCount + 8) = vertexCount + 8
+point2Vertex(edgeCount + 8) = vertexCount + 1
+col(edgeCount + 8) = 12
+
+' Update the counters for the next set of vertices and edges
+vertexCount = vertexCount + b
+edgeCount = edgeCount + 8
+
+END SUB
+
+SUB nait3d
+
+    ' Main loop to render the 3D scene
+1
+
+    ' Update the position based on rotation
+    myx = myx + SIN(deg1) * mye
+    myz = myz + COS(deg1) * mye
+
+    myx = myx + COS(deg1) * myk
+    myz = myz - SIN(deg1) * myk
+
+    ' Update the rotation angles
+    deg1 = deg1 + d1
+    Deg2 = Deg2 + d2
+
+    ' Calculate the rotation matrices
+    C1 = COS(deg1): S1 = SIN(deg1)
+    C2 = COS(Deg2): S2 = SIN(Deg2)
+
+    ' Apply the rotation to each vertex
+    FOR a = 1 TO vertexCount
+        xo = xVertex(a) - myx
+        yo = -yVertex(a) - myy
+        zo = zVertex(a) - myz
+
+        x1 = (xo * C1 - zo * S1)
+        z1 = (xo * S1 + zo * C1)
+
+        y1 = (yo * C2 - z1 * S2)
+        z2 = (yo * S2 + z1 * C2)
+
+        ' Project the vertex onto the 2D screen
+        xOriginal(a) = xCoordinate(a)
+        yOriginal(a) = yCoordinate(a)
+        IF z2 < 20 THEN
+            xCoordinate(a) = -1
+        ELSE
+            xCoordinate(a) = 320 + (x1 / z2 * 500)
+            yCoordinate(a) = 240 + (y1 / z2 * 500)
+        END IF
+    NEXT
+
+    ' Draw the edges of each shape
+    FOR a = 1 TO edgeCount
+        p1 = point1Vertex(a)
+        p2 = point2Vertex(a)
+        IF xOriginal(p1) = -1 OR xOriginal(p2) = -1 THEN
+            ' Skip drawing if the vertex is off-screen
+        ELSE
+            ' erase edge on old coordinates
+            LINE (xOriginal(p1), yOriginal(p1))-(xOriginal(p2), yOriginal(p2)), 0
+        END IF
+
+        IF xCoordinate(p1) = -1 OR xCoordinate(p2) = -1 THEN
+            ' Skip drawing if the vertex is off-screen
+        ELSE
+            ' draw edge on new coordinates
+            LINE (xCoordinate(p1), yCoordinate(p1))-(xCoordinate(p2), yCoordinate(p2)), col(a)
+        END IF
+    NEXT
+
+    ' Handle user input
+    K$ = INKEY$
+    IF K$ <> "" THEN
+
+        SELECT CASE K$
+
+            CASE CHR$(0) + "P"
+                mye = mye - 3
+
+            CASE CHR$(0) + "H"
+                mye = mye + 3
+
+            CASE CHR$(0) + "M"
+                myk = myk + 3
+
+            CASE CHR$(0) + "K"
+                myk = myk - 3
+
+            CASE "+"
+                myy = myy + 3
+
+            CASE "-"
+                myy = myy - 3
+
+            CASE "6"
+                d1 = d1 + .01
+
+            CASE "4"
+                d1 = d1 - .01
+
+            CASE "8"
+                d2 = d2 - .01
+
+            CASE "2"
+                d2 = d2 + .01
+
+            CASE " "
+                d1 = d1 / 2
+                d2 = d2 / 2
+                d3 = d3 / 2
+                mye = mye / 2
+                myk = myk / 2
+
+            CASE "q"
+                SYSTEM
+
+            CASE CHR$(27)
+                SYSTEM
+        END SELECT
+    END IF
+
+    ' Continue the main loop
+    GOTO 1
+END SUB
+
+SUB porand
+
+    ' Generate a grid of shapes in 3D space
+    FOR x = -100 TO 0 STEP 12.067 + .3
+        FOR z = -100 TO 0 STEP 12.067 + .3
+            renderHexagon x, -125, z, 6.53
+            renderSquare x + 6.033 + .15, -125, z + 6.033 + .15, 3.111 + .3
+        NEXT z
+    NEXT x
+
+    ' Generate another grid of shapes in 3D space
+    FOR y = -100 TO 0 STEP 20.3
+        FOR x = -100 TO 0 STEP 20.3
+            renderSquare2 x, y, 200, 10
+        NEXT x
+    NEXT y
+
+END SUB
+
+SUB renderSquare (x%, y%, z%, s%)
+
+    ' Define the vertices of a square in 3D space
+    xVertex(vertexCount + 1) = x%
+    yVertex(vertexCount + 1) = y%
+    zVertex(vertexCount + 1) = z% + s%
+
+    xVertex(vertexCount + 2) = x% + s%
+    yVertex(vertexCount + 2) = y%
+    zVertex(vertexCount + 2) = z%
+
+    xVertex(vertexCount + 3) = x%
+    yVertex(vertexCount + 3) = y%
+    zVertex(vertexCount + 3) = z% - s%
+
+    xVertex(vertexCount + 4) = x% - s%
+    yVertex(vertexCount + 4) = y%
+    zVertex(vertexCount + 4) = z%
+
+    ' Define the edges of the square
+    point1Vertex(edgeCount + 1) = vertexCount + 1
+    point2Vertex(edgeCount + 1) = vertexCount + 2
+    col(edgeCount + 1) = 10
+
+    point1Vertex(edgeCount + 2) = vertexCount + 2
+    point2Vertex(edgeCount + 2) = vertexCount + 3
+    col(edgeCount + 2) = 10
+
+    point1Vertex(edgeCount + 3) = vertexCount + 3
+    point2Vertex(edgeCount + 3) = vertexCount + 4
+    col(edgeCount + 3) = 10
+
+    point1Vertex(edgeCount + 4) = vertexCount + 4
+    point2Vertex(edgeCount + 4) = vertexCount + 1
+    col(edgeCount + 4) = 10
+
+    ' Update the counters for the next square
+    vertexCount = vertexCount + 4
+    edgeCount = edgeCount + 4
+
+END SUB
+
+SUB renderSquare2 (x, y, z, s)
+
+    ' Define the vertices of a square in 3D space
+    xVertex(vertexCount + 1) = x - s
+    yVertex(vertexCount + 1) = y - s
+    zVertex(vertexCount + 1) = z
+
+    xVertex(vertexCount + 2) = x + s
+    yVertex(vertexCount + 2) = y - s
+    zVertex(vertexCount + 2) = z
+
+    xVertex(vertexCount + 3) = x + s
+    yVertex(vertexCount + 3) = y + s
+    zVertex(vertexCount + 3) = z
+
+    xVertex(vertexCount + 4) = x - s
+    yVertex(vertexCount + 4) = y + s
+    zVertex(vertexCount + 4) = z
+
+    ' Define the edges of the square
+    point1Vertex(edgeCount + 1) = vertexCount + 1
+    point2Vertex(edgeCount + 1) = vertexCount + 2
+    col(edgeCount + 1) = 14
+
+    point1Vertex(edgeCount + 2) = vertexCount + 2
+    point2Vertex(edgeCount + 2) = vertexCount + 3
+    col(edgeCount + 2) = 14
+
+    point1Vertex(edgeCount + 3) = vertexCount + 3
+    point2Vertex(edgeCount + 3) = vertexCount + 4
+    col(edgeCount + 3) = 14
+
+    point1Vertex(edgeCount + 4) = vertexCount + 4
+    point2Vertex(edgeCount + 4) = vertexCount + 1
+    col(edgeCount + 4) = 14
+
+    ' Update the counters for the next square
+    vertexCount = vertexCount + 4
+    edgeCount = edgeCount + 4
+
+END SUB
+
+SUB start
+
+    ' Initialize the screen and clear it
+    SCREEN 12
+    CLS
+
+    ' Set the initial color of all shapes
+    FOR a = 1 TO 4000
+        col(a) = 15
+    NEXT a
+
+    ' Initialize counters for vertices and edges
+    vertexCount = 0
+    edgeCount = 0
+
+    ' Generate the initial set of shapes
+    getCornerVertices
+
+END SUB
diff --git a/3D GFX/Miscellaneous/Tiled room.webm b/3D GFX/Miscellaneous/Tiled room.webm
new file mode 100644
index 0000000..0c4263a
Binary files /dev/null and b/3D GFX/Miscellaneous/Tiled room.webm differ
diff --git a/3D GFX/Miscellaneous/font.dat b/3D GFX/Miscellaneous/font.dat
new file mode 100644
index 0000000..d3c1e68
--- /dev/null
+++ b/3D GFX/Miscellaneous/font.dat	
@@ -0,0 +1,230 @@
+# a
+p 1 0
+p 0 1
+p 2 1
+p 0 2
+p 2 2
+l 0 1
+l 0 2
+l 1 2
+l 1 3
+l 2 4
+# b
+p 0 0
+p 2 0
+p 0 1
+p 0 2
+p 2 2
+l 0 1
+l 0 3
+l 1 2
+l 3 4
+l 4 2
+# c
+p 2 0
+p 1 0
+p 0 1
+p 1 2
+p 2 2
+l 0 1
+l 1 2
+l 2 3
+l 3 4
+# d
+p 0 0
+p 1 0
+p 2 1
+p 1 2
+p 0 2
+l 0 1
+l 1 2
+l 2 3
+l 3 4
+l 4 0
+# e
+p 0 0
+p 2 0
+p 0 1
+p 2 1
+p 0 2
+p 2 2
+l 0 1
+l 2 3
+l 4 5
+l 0 4
+# f
+p 0 0
+p 2 0
+p 0 1
+p 2 1
+p 0 2
+l 0 1
+l 2 3
+l 0 4
+# g
+p 2 0
+p 1 0
+p 0 1
+p 1 2
+p 2 2
+p 2 1
+p 1 1
+l 0 1
+l 1 2
+l 2 3
+l 3 4
+l 4 5
+l 5 6
+# h
+p 0 0
+p 0 2
+p 2 0
+p 2 2
+p 0 1
+p 2 1
+l 0 1
+l 2 3
+l 4 5
+# i
+p 1 0
+p 1 2
+l 0 1
+# j
+p 0 1
+p 0 2
+p 1 2
+p 1 0
+l 0 1
+l 1 2
+l 2 3
+# k
+p 0 0
+p 0 2
+p 2 0
+p 2 2
+p 0 1
+l 0 1
+l 2 4
+l 4 3
+# l
+p 0 0
+p 0 2
+p 2 2
+l 0 1
+l 1 2
+# m
+p 0 2
+p 0 0
+p 1 1
+p 2 0
+p 2 2
+l 0 1
+l 1 2
+l 2 3
+l 3 4
+# n
+p 0 2
+p 0 0
+p 2 2
+p 2 0
+l 0 1
+l 1 2
+l 2 3
+# o
+p 0 0
+p 2 0
+p 2 2
+p 0 2
+l 0 1
+l 1 2
+l 2 3
+l 3 0
+# p
+p 0 0
+p 2 0
+p 2 1
+p 0 1
+p 0 2
+l 0 1
+l 1 2
+l 2 3
+l 0 4
+# q
+p 0 0
+p 2 0
+p 2 2
+p 0 2
+p 1 1
+l 0 1
+l 1 2
+l 2 3
+l 3 0
+l 2 4
+# r
+p 0 0
+p 2 0
+p 2 1
+p 0 1
+p 0 2
+p 2 2
+l 0 1
+l 1 2
+l 2 3
+l 0 4
+l 5 3
+# s
+p 2 0
+p 0 0
+p 0 1
+p 2 1
+p 2 2
+p 0 2
+l 0 1
+l 1 2
+l 2 3
+l 3 4
+l 4 5
+# t
+p 0 0
+p 2 0
+p 1 0
+p 1 2
+l 0 1
+l 2 3
+# u
+p 0 0
+p 0 2
+p 2 2
+p 2 0
+l 0 1
+l 1 2
+l 2 3
+# v
+p 0 0
+p 1 2
+p 2 0
+l 0 1
+l 1 2
+# x
+p 0 0
+p 2 2
+p 2 0
+p 0 2
+l 0 1
+l 2 3
+# y
+p 0 0
+p 2 0
+p 1 1
+p 1 2
+l 0 2
+l 1 2
+l 2 3
+# z
+p 0 0
+p 2 0
+p 0 2
+p 2 2
+l 0 1
+l 1 2
+l 2 3
\ No newline at end of file
diff --git a/3D GFX/Miscellaneous/index.html b/3D GFX/Miscellaneous/index.html
new file mode 100644
index 0000000..ea5b4f2
--- /dev/null
+++ b/3D GFX/Miscellaneous/index.html	
@@ -0,0 +1,416 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2025-07-28 ma 03:33 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Miscellaneous 3D graphics demos</title>
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
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+              font-weight: bold;
+              margin-top:0; }
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+            padding: 2px; font-size: 80%; font-weight: normal; }
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+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #e6e6e6;
+    border-radius: 3px;
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+    padding: 8pt;
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+    overflow: auto;
+    margin: 1.2em;
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+    position: relative;
+    overflow: auto;
+  }
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+    position: absolute;
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+  pre.src-C:before { content: 'C'; }
+  /* pre.src-C++ doesn't work in CSS */
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+  /* additional language identifiers from org-babel-shell-names in
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+  /* add a generic configuration mode; LaTeX export needs an additional
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+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
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+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
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+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
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+    display: table;
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+    width: 100%;
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+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
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+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
+<style type="text/css">
+               body {
+                 max-width: 35cm !important;
+               }
+               #content {
+                 max-width: 80em !important;
+                 width: 90%;
+               }
+               </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">Miscellaneous 3D graphics demos</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#org7773f6b">1. Rotating exclamation mark</a></li>
+<li><a href="#org3e8525d">2. 3D bouncing ball</a></li>
+<li><a href="#orgbda18f8">3. 3D text in a room</a></li>
+<li><a href="#org3f9cc1b">4. 3D bouncing cubes on grid floor</a></li>
+<li><a href="#org59197c7">5. Matrix math for rotation in 3D space</a></li>
+<li><a href="#orgb8734ec">6. Maze explorer</a></li>
+<li><a href="#org33e3a25">7. Tank animation</a></li>
+<li><a href="#orgfb42a5b">8. Tiled room</a></li>
+</ul>
+</div>
+</div>
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+
+<div id="outline-container-org7773f6b" class="outline-2">
+<h2 id="org7773f6b"><span class="section-number-2">1.</span> Rotating exclamation mark</h2>
+<div class="outline-text-2" id="text-1">
+<p>
+Wireframe 3D model of a rotating exclamation mark.
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="!.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="!.bas">Source code</a>
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-org3e8525d" class="outline-2">
+<h2 id="org3e8525d"><span class="section-number-2">2.</span> 3D bouncing ball</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+3D ball made of point cloud.
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="3D%20ball.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="3D%20ball.bas">Source code</a>
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-orgbda18f8" class="outline-2">
+<h2 id="orgbda18f8"><span class="section-number-2">3.</span> 3D text in a room</h2>
+<div class="outline-text-2" id="text-3">
+<p>
+Wireframe 3D text hanging in a wireframe 3D room. User can look and
+fly around in all directions.
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="3D text.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="3D%20text.bas">Source code</a>
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-org3f9cc1b" class="outline-2">
+<h2 id="org3f9cc1b"><span class="section-number-2">4.</span> 3D bouncing cubes on grid floor</h2>
+<div class="outline-text-2" id="text-4">
+<p>
+3D wireframe cubes bouncing on a grid floor, creating an immersive and
+dynamic visual effect.
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Bouncing cubes.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="3D%20GFX/Bouncing%20cubes.bas">Source code</a>
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-org59197c7" class="outline-2">
+<h2 id="org59197c7"><span class="section-number-2">5.</span> Matrix math for rotation in 3D space</h2>
+<div class="outline-text-2" id="text-5">
+<p>
+Instead of combining simple 2D rotors, pixels in this 3D space are
+rotated by using matrix multiplications.
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Matrix math.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="Matrix%20math.bas">Source code</a>
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-orgb8734ec" class="outline-2">
+<h2 id="orgb8734ec"><span class="section-number-2">6.</span> Maze explorer</h2>
+<div class="outline-text-2" id="text-6">
+<p>
+TODO: add description
+</p>
+
+
+<div id="org5fab01b" class="figure">
+<p><a href="Maze%20explorer.bas" class="responsive-img"><img src="Maze%20explorer.png" alt="Maze%20explorer.png" class="responsive-img" /></a>
+</p>
+</div>
+
+<p>
+<a href="Maze explorer.bas">Source code</a>
+</p>
+</div>
+</div>
+
+<div id="outline-container-org33e3a25" class="outline-2">
+<h2 id="org33e3a25"><span class="section-number-2">7.</span> Tank animation</h2>
+<div class="outline-text-2" id="text-7">
+<p>
+Animated tank driving through the bridge back and forward. User can
+look and fly around in all directions.
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Tank.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="Tank.bas">Source code</a>
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-orgfb42a5b" class="outline-2">
+<h2 id="orgfb42a5b"><span class="section-number-2">8.</span> Tiled room</h2>
+<div class="outline-text-2" id="text-8">
+<p>
+Room with some tiles on the wall and on the floor. User can freely fly
+around.
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Tiled room.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="Tiled%20room.bas">Source code</a>
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2025-07-28 ma 03:33</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/3D GFX/Miscellaneous/index.org b/3D GFX/Miscellaneous/index.org
new file mode 100644
index 0000000..3eb03a3
--- /dev/null
+++ b/3D GFX/Miscellaneous/index.org	
@@ -0,0 +1,153 @@
+#+TITLE: Miscellaneous 3D graphics demos
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+#+begin_export html
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+#+end_export
+
+* Rotating exclamation mark
+
+Wireframe 3D model of a rotating exclamation mark.
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="!.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:!.bas][Source code]]
+
+
+* 3D bouncing ball
+
+3D ball made of point cloud.
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="3D%20ball.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:3D%20ball.bas][Source code]]
+
+
+* 3D text in a room
+
+Wireframe 3D text hanging in a wireframe 3D room. User can look and
+fly around in all directions.
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="3D text.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:3D%20text.bas][Source code]]
+
+
+* 3D bouncing cubes on grid floor
+
+3D wireframe cubes bouncing on a grid floor, creating an immersive and
+dynamic visual effect.
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Bouncing cubes.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:3D%20GFX/Bouncing%20cubes.bas][Source code]]
+
+
+* Matrix math for rotation in 3D space
+
+Instead of combining simple 2D rotors, pixels in this 3D space are
+rotated by using matrix multiplications.
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Matrix math.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Matrix%20math.bas][Source code]]
+
+
+* Maze explorer
+
+TODO: add description
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Maze%20explorer.bas][file:Maze%20explorer.png]]
+
+[[file:Maze explorer.bas][Source code]]
+
+* Tank animation
+
+Animated tank driving through the bridge back and forward. User can
+look and fly around in all directions.
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Tank.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Tank.bas][Source code]]
+
+
+* Tiled room
+
+Room with some tiles on the wall and on the floor. User can freely fly
+around.
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Tiled room.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Tiled%20room.bas][Source code]]
diff --git a/3D GFX/Miscellaneous/logo.png b/3D GFX/Miscellaneous/logo.png
new file mode 100644
index 0000000..f261c1b
Binary files /dev/null and b/3D GFX/Miscellaneous/logo.png differ
diff --git a/3D GFX/Ray casting engine.bas b/3D GFX/Ray casting engine.bas
new file mode 100755
index 0000000..53e17ee
--- /dev/null
+++ b/3D GFX/Ray casting engine.bas	
@@ -0,0 +1,422 @@
+DECLARE SUB InitializeProgram ()
+DECLARE SUB GenerateLandscape ()
+DECLARE SUB DisplayTopDownLandscape ()
+DECLARE SUB DisplayFrame ()
+DECLARE FUNCTION getcol! (r!, g!, b!)
+DECLARE SUB FillSquareArea (x1%, y1%, x2%, y2%, c%, h%)
+DECLARE SUB CreateTower (towerX%, towerY%)
+DECLARE SUB SetupPalette ()
+DECLARE SUB DrawLineFromPlayer (x%, y%, xl%)
+' Realtime 3D rendering with ray casting engine.
+
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2003.03, Initial version
+' 2024 - 2025, Improved program readability
+
+' 3D engine automatically adjusts quality to keep constant framerate at 10 fps.
+' When framerate is lower than 10 fps, quality will be decreased to speed up rendering.
+
+' At least Intel Pentium 200 MHz in DOS mode is required to run this program smoothly.
+
+' keys to use:
+' Arrow keys - move around
+' 4, 6       - turn left, right
+' 8, 2       - look up, down
+' Enter      - Toggle full quality
+' Space      - jump up (fly)
+' ESC        - exit program
+
+DEFINT A-Y
+
+DIM SHARED landh(0 TO 180, 0 TO 180)
+DIM SHARED landc(0 TO 180, 0 TO 180)
+
+DIM SHARED zmyx, zmyy, zmyz
+DIM SHARED myx, myy, myz
+DIM SHARED zmyan, myan2
+DIM SHARED ste, stem, dist
+DIM SHARED tim$, frm, frml
+
+frmrate = 10    ' Desired framerate.
+                ' Lower framerate, better quality
+
+InitializeProgram
+GenerateLandscape
+
+DisplayTopDownLandscape
+a$ = INPUT$(1)
+1
+LOCATE 1, 35
+PRINT frml
+
+' Increment the frame counter
+frm = frm + 1
+
+' Check if a new second has passed
+IF tim$ <> TIME$ THEN
+    ' Update the time
+    tim$ = TIME$
+
+    ' Adjust the step size based on the current frame rate
+    IF frm > frmrate THEN
+        ste = ste - 1
+    ELSE
+        ste = ste + 1
+    END IF
+
+    ' Ensure the step size is within bounds
+    IF ste < 1 THEN
+        ste = 1
+    END IF
+
+    ' Calculate the previous step size
+    stem = ste - 1
+
+    ' Update the frame rate and reset the frame counter
+    frml = frm
+    frm = 0
+END IF
+
+' Check for user input
+a$ = INKEY$
+IF a$ <> "" THEN
+    SELECT CASE a$
+        CASE "4"
+            ' Turn left
+            zmyan = zmyan + .1
+        CASE "6"
+            ' Turn right
+            zmyan = zmyan - .1
+        CASE "8"
+            ' Look up
+            myan2 = myan2 + 5
+        CASE "2"
+            ' Look down
+            myan2 = myan2 - 5
+        CASE CHR$(0) + "H"
+            ' Move forward
+            zmyx = SIN(zmyan) * 3 + zmyx
+            zmyy = COS(zmyan) * 3 + zmyy
+        CASE CHR$(0) + "P"
+            ' Move backward
+            zmyx = -SIN(zmyan) * 3 + zmyx
+            zmyy = -COS(zmyan) * 3 + zmyy
+        CASE CHR$(0) + "K"
+            ' Move left
+            zmyx = COS(zmyan) * 3 + zmyx
+            zmyy = -SIN(zmyan) * 3 + zmyy
+        CASE CHR$(0) + "M"
+            ' Move right
+            zmyx = -COS(zmyan) * 3 + zmyx
+            zmyy = SIN(zmyan) * 3 + zmyy
+        CASE " "
+            ' Jump up (fly)
+            zmyzs = 2
+        CASE CHR$(13)
+            ' Toggle full quality
+            ste = 1
+        CASE CHR$(27)
+            ' Exit the program
+            SYSTEM
+    END SELECT
+END IF
+
+' Ensure the player stays within bounds
+IF zmyx > 170 THEN
+    zmyx = 170
+END IF
+IF zmyy > 170 THEN
+    zmyy = 170
+END IF
+IF zmyx < 10 THEN
+    zmyx = 10
+END IF
+IF zmyy < 10 THEN
+    zmyy = 10
+END IF
+
+' Handle jumping
+zmyz = zmyz + zmyzs
+zmyzs = zmyzs - .1
+
+' Ensure the player does not go below the ground
+IF zmyz < landh(myx, myy) + 10 THEN
+    zmyz = landh(myx, myy) + 10
+    ' Adjust jump speed
+    zmyzs = (zmyzs / 2) + .2
+END IF
+
+' Update player position
+myz = zmyz
+myy = zmyy
+myx = zmyx
+DisplayFrame
+GOTO 1
+
+SUB CreateTower (towerX%, towerY%)
+
+' Draw a tower at the specified position
+FOR a = 10 TO 0 STEP -1
+    ' Fill each level of the tower with color
+    FillSquareArea towerX% - a, towerY% - a, towerX% + a, towerY% + a, getcol(100, 0, a * 20), 20 - a
+NEXT a
+
+' Draw the top of the tower
+FillSquareArea towerX% - 11, towerY% - 11, towerX% - 9, towerY% - 9, getcol(255, 0, 0), 20
+FillSquareArea towerX% + 9, towerY% - 11, towerX% + 11, towerY% - 9, getcol(0, 255, 0), 20
+FillSquareArea towerX% - 11, towerY% + 9, towerX% - 9, towerY% + 11, getcol(0, 0, 255), 20
+FillSquareArea towerX% + 9, towerY% + 9, towerX% + 11, towerY% + 11, getcol(255, 255, 0), 20
+
+END SUB
+
+SUB DisplayFrame
+
+l = 0
+zst = -.0031 * ste
+FOR z = .5 TO -.5 STEP zst
+    ' Trace a line from the player's perspective
+    DrawLineFromPlayer SIN(zmyan + z) * dist + myx, COS(zmyan + z) * dist + myy, l
+    l = l + ste
+NEXT z
+
+END SUB
+
+SUB DisplayTopDownLandscape
+
+' Draw the landscape from a top-down perspective
+FOR z = 0 TO 180
+    zs = 1
+    IF z > 120 THEN
+        ' Adjust the step size for better performance
+        zs = .7
+    END IF
+    IF z > 160 THEN
+        ' Further adjust the step size
+        zs = .6
+    END IF
+    FOR zx = 0 TO 180 STEP zs
+        y1 = landh(zx, z) - 80
+        zx1 = zx - 90
+        z1 = 300 - z
+        zx2 = zx1 / z1 * 190
+        zy2 = y1 / z1 * 190
+
+        ' Draw a line representing the height of the landscape
+        LINE (zx2 + 160, 40 - zy2)-(zx2 + 160, 200), landc(zx, z)
+    NEXT zx
+NEXT z
+
+' Display a message to continue
+LOCATE 1, 1
+PRINT "Press any key to continue..."
+
+END SUB
+
+SUB DrawLineFromPlayer (x%, y%, xl%)
+
+' Trace a line from the player's perspective
+IF x < 0 THEN
+    ' Calculate the distance to the next point
+    zpr = myx / (myx - x)
+    x = 0
+    y = myy - ((myy - y) * zpr)
+END IF
+
+IF y < 0 THEN
+    ' Calculate the distance to the next point
+    zpr = myy / (myy - y)
+    y = 0
+    x = myx - ((myx - x) * zpr)
+END IF
+
+IF x > 180 THEN
+    ' Calculate the distance to the next point
+    zpr = (180 - myx) / (x - myx)
+    x = 180
+    y = myy - ((myy - y) * zpr)
+END IF
+
+IF y > 180 THEN
+    ' Calculate the distance to the next point
+    zpr = (180 - myy) / (y - myy)
+    y = 180
+    x = myx - ((myx - x) * zpr)
+END IF
+
+' Calculate the distance to the next point
+lp% = SQR(ABS(myx - x) ^ 2 + ABS(myy - y) ^ 2)
+
+' Save the current player position and orientation
+imyx% = myx
+imyy% = myy
+imyz% = myz
+xp% = x - imyx%
+yp% = y - imyy%
+istem% = stem
+imyan2% = myan2
+
+' Draw the line
+yo% = 200
+FOR a% = 1 TO lp%
+    cx% = xp% * a% / lp% + imyx%
+    cy% = yp% * a% / lp% + imyy%
+    yn% = imyan2% - ((landh(cx%, cy%) - imyz%) / a%) * 300
+
+    ' Draw the line segment
+    IF yn% < yo% THEN
+        LINE (xl%, yn%)-(xl% + istem%, yo% - 1), landc(cx%, cy%), BF
+        yo% = yn%
+    END IF
+NEXT a%
+
+' Draw the final line segment
+LINE (xl%, yo% - 1)-(xl% + istem%, 0), 0, BF
+
+END SUB
+
+SUB FillSquareArea (x1%, y1%, x2%, y2%, c%, h%)
+
+' Fill a square area with the specified color and height
+FOR y = y1 TO y2
+    FOR x = x1 TO x2
+        landh(x, y) = h
+        landc(x, y) = c
+    NEXT x
+NEXT y
+
+END SUB
+
+SUB GenerateLandscape
+
+' Create a square landscape
+FillSquareArea 0, 0, 180, 180, 15, 0
+
+' Generate the landscape height and color
+FOR y = 0 TO 180
+    FOR x = 0 TO 180
+        ' Calculate the checkerboard pattern
+        x1 = (x \ 10) MOD 2
+        y1 = (y \ 10) MOD 2
+        c = (x1 + y1) MOD 2
+
+        IF c = 0 THEN
+            ' Set the color to blue
+            landc(x, y) = getcol(0, 0, 250)
+        ELSE
+            ' Set the color to gray
+            landc(x, y) = getcol(50, 50, 50)
+        END IF
+    NEXT x
+NEXT y
+
+' Generate a hill
+FOR y = 10 TO 90
+    FOR x = 90 TO 170
+        ' Calculate the height of the hill
+        v = SQR((ABS(50 - y)) ^ 2 + (ABS(130 - x)) ^ 2)
+        h = SQR((60 - v) * (60 + v)) - 35
+
+        ' Ensure the height is positive
+        IF h > 0 THEN
+            landh(x, y) = h
+        END IF
+    NEXT x
+NEXT y
+
+' Add towers to the landscape
+CreateTower 20, 20
+CreateTower 60, 20
+CreateTower 40, 60
+
+' Generate a path
+FOR y = 100 TO 150
+    FOR x = 0 TO 50
+        ' Set the color to a dynamic value
+        landc(x, y) = getcol(SIN((x + y) / 2) * 125 + 125, SIN(x / 2) * 125 + 125, SIN(y / 2) * 125 + 125)
+        ' Set the height of the path
+        landh(x, y) = 50 - x
+    NEXT x
+NEXT y
+
+' Generate a spiral path
+FOR za = 0 TO 20 STEP .1
+    x = SIN(za) * (1 + (za * 2)) + 100
+    y = COS(za) * (1 + (za * 2)) + 100
+
+    ' Set the color of the spiral path
+    landc(x, y) = 200
+    landc(x + 1, y) = 200
+    landc(x, y + 1) = 200
+    landc(x + 1, y + 1) = 200
+NEXT za
+
+END SUB
+
+DEFSNG A-Y
+FUNCTION getcol (r, g, b)
+IF r < 0 THEN
+    ' Ensure the color value is within bounds
+    r = 0
+END IF
+IF g < 0 THEN
+    g = 0
+END IF
+IF b < 0 THEN
+    b = 0
+END IF
+IF r > 255 THEN
+    r = 255
+END IF
+IF g > 255 THEN
+    g = 255
+END IF
+IF b > 255 THEN
+    b = 255
+END IF
+' Calculate the color index
+getcol = INT(r / 43) * 36 + INT(g / 43) * 6 + INT(b / 43)
+END FUNCTION
+
+DEFINT A-Y
+SUB InitializeProgram
+' Set the graphics mode
+SCREEN 13
+PRINT "please wait..."
+
+' Initialize the color palette
+SetupPalette
+
+' Initialize player position and orientation
+zmyan = 4.14
+myan2 = 100
+ste = 1
+stem = ste - 1
+dist = 190
+tim$ = TIME$
+zmyx = 170
+zmyy = 170
+zmyz = 20
+
+END SUB
+
+SUB SetupPalette
+' Initialize the color palette
+c = 0
+FOR r = 0 TO 5
+    FOR g = 0 TO 5
+        FOR b = 0 TO 5
+            OUT &H3C8, c
+            c = c + 1
+            OUT &H3C9, r * 12
+            OUT &H3C9, g * 12
+            OUT &H3C9, b * 12
+        NEXT b
+    NEXT g
+NEXT r
+END SUB
+
diff --git a/3D GFX/Ray casting engine.html b/3D GFX/Ray casting engine.html
new file mode 100644
index 0000000..d5184d9
--- /dev/null
+++ b/3D GFX/Ray casting engine.html	
@@ -0,0 +1,16 @@
+<HTML>
+<HEAD><TITLE>ray casting 3D engine</TITLE></HEAD>
+
+<BODY text=#A0A0ff vLink=#0000ff aLink=#0000ff link=#0000ff bgColor=#000000>
+
+<CENTER><H1>ray casting 3D engine</H1></CENTER>
+<BR>
+<BR>
+3D engine what draws 3D landscape using ray casting alghoritm
+in realtime. You can walk/jump around, rotate view and look up and down. 
+Image Quality will be automatically adjusted, to keep constant framerate.
+At least Pentium 200 MHz in DOS mode should be nice.
+
+<BR><IMG SRC="sshot.png">
+</BODY>
+</HTML>
\ No newline at end of file
diff --git a/3D GFX/Ray casting engine.png b/3D GFX/Ray casting engine.png
new file mode 100644
index 0000000..bc1851d
Binary files /dev/null and b/3D GFX/Ray casting engine.png differ
diff --git a/3D GFX/Space/Galaxy explorer.bas b/3D GFX/Space/Galaxy explorer.bas
new file mode 100755
index 0000000..5a2f74d
--- /dev/null
+++ b/3D GFX/Space/Galaxy explorer.bas	
@@ -0,0 +1,347 @@
+' Program to render a 3D point cloud galaxy.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2003, Initial version.
+' 2024, Improved program readability.
+
+' User can navigate through the galaxy using mouse or keyboard controls.
+' To use mouse controls, program requires a special TSR (terminate and stay resident)
+' program to be loaded. The TSR makes mouse input available to the QBasic program.
+
+' Navigation controls:
+' - Press left and right mouse buttons simultaneously to move in X and Z axis.
+' - Press right mouse button to move in Y axis.
+' - Use keyboard keys 'a', 'd', 'w', 's' to move in X and Z axis.
+' - Press 'q' to quit the program.
+
+DECLARE SUB temp ()
+DECLARE SUB mkGalaxy (x!, y!, z!)
+DECLARE SUB rndInit ()
+DECLARE FUNCTION rn! ()
+DECLARE SUB disp ()
+DECLARE SUB control ()
+DECLARE SUB putByte (addr!, dat!)
+DECLARE SUB putWord (addr!, dat!)
+DECLARE FUNCTION getWord! (addr!)
+DECLARE FUNCTION getByte! (addr!)
+DECLARE SUB start ()
+DECLARE SUB animate ()
+
+DIM SHARED angle1, angle2, angle3
+
+DIM SHARED time
+
+DIM SHARED externalSegment, externalAddress
+
+' Variables for the camera position and movement
+DIM SHARED myX, myY, myZ
+DIM SHARED speedX, speedY, speedZ
+DIM SHARED buttonLeft, buttonRight
+DIM SHARED maxMove
+
+' Variable for zoom level
+DIM SHARED zoom
+
+' Array to store random values
+DIM SHARED randomValue(0 TO 10000)
+DIM SHARED randomPointer
+
+' Arrays to store point coordinates and colors. These points make up galaxy.
+DIM SHARED pointX(1 TO 12000)
+DIM SHARED pointY(1 TO 12000)
+DIM SHARED pointZ(1 TO 12000)
+DIM SHARED pointColor(1 TO 12000)
+DIM SHARED numPoints
+
+' Temporary register array
+DIM SHARED temporaryRegister(0 TO 10)
+
+newLine = 0
+newPage = 0
+
+start
+
+currentX = 0
+currentY = 0
+currentZ = 0
+
+numPoints = 0
+mkGalaxy 0, 0, 0
+1
+
+' Generate a random angle for initial camera position
+variableAngle = INT(RND * 3)
+
+SELECT CASE variableAngle
+CASE 0
+    currentX = RND * 500 - 250
+CASE 1
+    currentY = RND * 100 - 50
+CASE 2
+    currentZ = RND * 500 - 250
+END SELECT
+
+control
+disp
+
+PCOPY 0, 1
+CLS
+GOTO 1
+
+SUB control
+
+' Check for mouse input
+IF getByte(8) <> 0 THEN
+    putByte 8, 0
+    xPosition = getWord(2)
+    putWord 2, 0
+    yPosition = getWord(4)
+    putWord 4, 0
+    button = getWord(6)
+    putWord 6, 0
+
+    ' Reset mouse buttons
+    buttonLeft = 0
+    buttonRight = 0
+
+    ' Handle mouse button states
+    IF button = 1 THEN buttonLeft = 1
+    IF button = 2 THEN buttonRight = 1
+    IF button = 3 THEN buttonLeft = 1: buttonRight = 1
+
+    ' Handle mouse movements
+    IF buttonRight = 1 THEN
+        IF buttonLeft = 1 THEN
+            speedX = speedX + SIN(angle1) * yPosition / 4
+            speedZ = speedZ - COS(angle1) * yPosition / 4
+            GOTO 3
+        END IF
+        speedY = speedY + yPosition / 4
+    3
+        yPosition = 0
+    END IF
+
+END IF
+
+' Limit the position values to prevent overflow
+IF xPosition < -maxMove THEN xPosition = -maxMove
+IF xPosition > maxMove THEN xPosition = maxMove
+angle1 = angle1 - xPosition / 150
+
+IF yPosition < -maxMove THEN yPosition = -maxMove
+IF yPosition > maxMove THEN yPosition = maxMove
+angle2 = angle2 - yPosition / 150
+
+' Check for keyboard input
+keyInput$ = INKEY$
+
+' Handle keyboard controls
+IF keyInput$ = "a" THEN speedX = speedX - COS(angle1): speedZ = speedZ - SIN(angle1)
+IF keyInput$ = "d" THEN speedX = speedX + COS(angle1): speedZ = speedZ + SIN(angle1)
+IF keyInput$ = "w" THEN speedX = speedX - SIN(angle1): speedZ = speedZ + COS(angle1)
+IF keyInput$ = "s" THEN speedX = speedX + SIN(angle1): speedZ = speedZ - COS(angle1)
+IF keyInput$ = "q" THEN SYSTEM
+
+' Decelerate the movement
+speedX = speedX / 1.1
+speedY = speedY / 1.1
+speedZ = speedZ / 1.1
+
+myX = myX + speedX
+myZ = myZ + speedZ
+myY = myY + speedY
+
+END SUB
+
+SUB disp
+
+' Calculate sine and cosine values for rotation angles
+sinAngle1 = SIN(angle1)
+cosAngle1 = COS(angle1)
+sinAngle2 = SIN(angle2)
+cosAngle2 = COS(angle2)
+
+' Loop through all points to calculate and display their positions
+FOR pointIndex = 1 TO numPoints
+
+    ' Calculate the distance from the camera
+    xCoordinate = pointX(pointIndex) - myX
+    yCoordinate = pointY(pointIndex) - myY
+    zCoordinate = pointZ(pointIndex) - myZ
+
+    ' Rotate the points
+    rotatedX = xCoordinate * cosAngle1 + zCoordinate * sinAngle1
+    rotatedZ = zCoordinate * cosAngle1 - xCoordinate * sinAngle1
+
+    rotatedY = yCoordinate * cosAngle2 + rotatedZ * sinAngle2
+    finalZ = rotatedZ * cosAngle2 - yCoordinate * sinAngle2
+
+    ' Draw points that are sufficiently close
+    IF finalZ > 3 THEN
+        screenX = rotatedX / finalZ * 130 + 160
+        screenY = rotatedY / finalZ * 130 + 100
+        PSET (screenX, screenY), pointColor(pointIndex)
+    END IF
+
+NEXT pointIndex
+END SUB
+
+FUNCTION getByte (address)
+getByte = PEEK(externalAddress + address)
+END FUNCTION
+
+FUNCTION getWord (address)
+firstByte = PEEK(externalAddress + address)
+secondByte = PEEK(externalAddress + address + 1)
+
+' Combine the two bytes into a single value
+combinedHex$ = HEX$(firstByte)
+IF LEN(combinedHex$) = 1 THEN combinedHex$ = "0" + combinedHex$
+IF LEN(combinedHex$) = 0 THEN combinedHex$ = "00"
+
+combinedValue = VAL("&H" + HEX$(secondByte) + combinedHex$)
+
+getWord = combinedValue
+END FUNCTION
+
+SUB mkGalaxy (localX, localY, localZ)
+
+' Generate random angles for stars within galaxy
+randomAngle1 = rn * 10
+randomAngle2 = rn * 10
+
+galaxySin1 = SIN(randomAngle1)
+galaxyCos1 = COS(randomAngle1)
+galaxySin2 = SIN(randomAngle2)
+galaxyCos2 = COS(randomAngle2)
+
+randomPointer = 0
+size = 100
+piValue = 3.14
+spiralBarsMultiplier = 3
+
+FOR pointIndex = 1 TO 10000
+
+    ' Generate a random star distance from the center
+    randomVariable = rn * 10
+    distanceFromCenter = randomVariable * randomVariable / 30
+
+    ' Calculate spiral offset and half of it
+    spiralOffset = rn * (11.5 - randomVariable) / 3
+    halfSpiralOffset = spiralOffset / 2
+
+    ' Generate angle exponent and spiral bar angle
+    angleExponent = rn * (distanceFromCenter / 2) / spiralBarsMultiplier * 2
+    spiralBarAngle = 2 * piValue / spiralBarsMultiplier * INT(rn * spiralBarsMultiplier)
+
+    ' Calculate x, z, and y coordinates
+    xCoordinate = (SIN(randomVariable - spiralBarAngle + angleExponent) * distanceFromCenter + rn * spiralOffset - halfSpiralOffset) * size
+    zCoordinate = (COS(randomVariable - spiralBarAngle + angleExponent) * distanceFromCenter + rn * spiralOffset - halfSpiralOffset) * size
+    yCoordinate = (rn * spiralOffset - halfSpiralOffset) * size
+
+    ' Rotate the coordinates
+    rotatedX = xCoordinate * galaxyCos1 + zCoordinate * galaxySin1
+    rotatedZ = zCoordinate * galaxyCos1 - xCoordinate * galaxySin1
+
+    rotatedY = yCoordinate * galaxyCos2 + rotatedZ * galaxySin2
+    finalZ = rotatedZ * galaxyCos2 - yCoordinate * galaxySin2
+
+    ' Store the point in arrays
+    numPoints = numPoints + 1
+
+    pointX(numPoints) = rotatedX + localX
+    pointY(numPoints) = rotatedY + localY
+    pointZ(numPoints) = finalZ + localZ
+    pointColor(numPoints) = INT(RND * 15) + 1
+NEXT pointIndex
+
+END SUB
+
+SUB putByte (address, dataByte)
+
+POKE (externalAddress + address), dataByte
+END SUB
+
+SUB putWord (address, dataWord)
+
+' Convert the word to a hexadecimal string
+hexValue$ = HEX$(dataWord)
+
+' Ensure the string has at least 4 characters
+2
+IF LEN(hexValue$) < 4 THEN
+    hexValue$ = "0" + hexValue$: GOTO 2
+END IF
+
+' Extract the first and second bytes
+firstByteValue = VAL("&H" + LEFT$(hexValue$, 2))
+secondByteValue = VAL("&H" + RIGHT$(hexValue$, 2))
+
+' Store the bytes in memory
+POKE (externalAddress + address), secondByteValue
+POKE (externalAddress + address + 1), firstByteValue
+
+END SUB
+
+FUNCTION rn
+
+' Increment the random pointer and get a new random value
+randomPointer = randomPointer + 1
+IF randomPointer > 10000 THEN randomPointer = 0
+rn = randomValue(randomPointer)
+
+END FUNCTION
+
+SUB rndInit
+
+' Initialize the array of random values
+FOR index = 0 TO 10000
+    randomValue(index) = RND
+NEXT index
+
+randomPointer = 0
+END SUB
+
+SUB start
+
+starText
+
+' Set up graphics mode
+SCREEN 7, , , 1
+
+' Initialize maximum movement and random values
+maxMove = 50
+rndInit
+
+END SUB
+
+SUB starText
+
+' Read the segment and address from the interrupt table
+DEF SEG = 0     ' read first from interrupt table
+
+externalSegment = PEEK(&H79 * 4 + 3) * 256
+externalSegment = externalSegment + PEEK(&H79 * 4 + 2)
+
+PRINT "Segment is: " + HEX$(externalSegment)
+
+externalAddress = PEEK(&H79 * 4 + 1) * 256
+externalAddress = externalAddress + PEEK(&H79 * 4 + 0)
+
+PRINT "relative address is:"; externalAddress
+
+' Read the word at the specified address
+DEF SEG = externalSegment
+
+IF getWord(0) <> 1983 THEN
+    PRINT "FATAL ERROR: you must load"
+    PRINT "QBasic extension TSR first!"
+    SYSTEM
+END IF
+
+END SUB
diff --git a/3D GFX/Space/Galaxy explorer.png b/3D GFX/Space/Galaxy explorer.png
new file mode 100644
index 0000000..28550e6
Binary files /dev/null and b/3D GFX/Space/Galaxy explorer.png differ
diff --git a/3D GFX/Space/Rocket simulator.bas b/3D GFX/Space/Rocket simulator.bas
new file mode 100755
index 0000000..deffee8
--- /dev/null
+++ b/3D GFX/Space/Rocket simulator.bas	
@@ -0,0 +1,475 @@
+' 3D rocket simulator. Rocket takes off from the surface of the planet.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2001, Initial version
+' 2024 - 2025, Improved program readability
+'
+' Usage:
+' arrow keys - move around
+' 2, 6, 4, 8 - look around
+' -          - fly up
+' +          - fly down
+
+DECLARE SUB AddRocketTrailPoints ()
+DECLARE SUB AddRocketTrailLine ()
+DEFDBL A-Z
+DECLARE SUB GenerateRocket ()
+DECLARE SUB GenerateEarth ()
+DECLARE SUB InitializeScene ()
+DECLARE SUB Render3DScene ()
+
+DIM SHARED pointX(1 TO 1500)
+DIM SHARED pointY(1 TO 1500)
+DIM SHARED pointZ(1 TO 1500)
+DIM SHARED lineStartPoint(1 TO 3000)
+DIM SHARED lineEndPoint(1 TO 3000)
+DIM SHARED lineColor(1 TO 3000)
+DIM SHARED onScreenPointX(1 TO 1900)
+DIM SHARED onScreenPointY(1 TO 1900)
+DIM SHARED rocketPointX(1 TO 200)
+DIM SHARED rocketPointY(1 TO 200)
+DIM SHARED rocketPointZ(1 TO 200)
+DIM SHARED pointCount, lineCount
+DIM SHARED cameraX, cameraY, cameraZ
+DIM SHARED cameraXSpeed, cameraYSpeed, cameraZSpeed
+DIM SHARED rotationAngleX, rotationAngleY
+DIM SHARED oldScreenPointX1(1 TO 2500)
+DIM SHARED oldScreenPointY1(1 TO 2500)
+DIM SHARED oldScreenPointX2(1 TO 2500)
+DIM SHARED oldScreenPointY2(1 TO 2500)
+DIM SHARED frameCount, frameCount2, frameRate
+DIM SHARED earthRadius, earthStep, rocketScale, rocketStep
+DIM SHARED pi
+DIM SHARED rocketStartPoint, rocketEndPoint, rocketPointCount
+DIM SHARED rocketX, rocketY, rocketZ, rocketXSpeed, rocketYSpeed, rocketZSpeed
+DIM SHARED timerString, timeSlice
+DIM SHARED lastAddedPoint
+
+InitializeScene
+
+rotationAngleX = -pi / 2
+
+' Initialize the rocket position and velocity
+rocketX = 0
+rocketY = earthRadius / 2 + .009
+rocketZ = 0
+cameraX = 0
+cameraY = earthRadius / 2
+cameraZ = -.05
+timeSlice = 0
+frameCount2 = 999999
+timerString$ = TIME$
+
+1
+frameCount = frameCount + 1
+frameCount2 = frameCount2 + 1
+
+' Display the current values of some variables
+LOCATE 1, 1
+PRINT pointCount, lineCount, earthRadius, earthStep
+LOCATE 2, 1
+PRINT rocketStartPoint, rocketEndPoint, TIMER
+
+' Update rocket position and velocity
+rocketX = rocketX + (rocketXSpeed * timeSlice)
+rocketY = rocketY + (rocketYSpeed * timeSlice)
+rocketZ = rocketZ + (rocketZSpeed * timeSlice)
+
+' Update the rocket's pitch and roll rates
+rocketYSpeed = rocketYSpeed + (.0098 * timeSlice)
+rocketXSpeed = SIN(frameCount / 20) / 50
+
+' Update the points that make up the rocket
+FOR a = 1 TO rocketPointCount
+    pointX(a + rocketStartPoint - 1) = rocketPointX(a) + rocketX
+    pointY(a + rocketStartPoint - 1) = rocketPointY(a) + rocketY
+    pointZ(a + rocketStartPoint - 1) = rocketPointZ(a) + rocketZ
+NEXT a
+
+' Update the observer position and velocity
+cameraX = cameraX + (cameraXSpeed * timeSlice)
+cameraY = cameraY + (cameraYSpeed * timeSlice)
+cameraZ = cameraZ + (cameraZSpeed * timeSlice)
+
+' Draw the 3D scene
+Render3DScene
+
+' Handle user input
+a$ = INKEY$
+IF a$ <> "" THEN
+    IF a$ = CHR$(0) + "H" THEN
+        ' Move forward
+        cameraZSpeed = cameraZSpeed - SIN(rotationAngleX) / 100
+        cameraXSpeed = cameraXSpeed + COS(rotationAngleX) / 100
+    END IF
+    IF a$ = CHR$(0) + "P" THEN
+        ' Move backward
+        cameraZSpeed = cameraZSpeed + SIN(rotationAngleX) / 100
+        cameraXSpeed = cameraXSpeed - COS(rotationAngleX) / 100
+    END IF
+    IF a$ = CHR$(0) + "M" THEN
+        ' Move right
+        cameraZSpeed = cameraZSpeed + COS(rotationAngleX) / 100
+        cameraXSpeed = cameraXSpeed + SIN(rotationAngleX) / 100
+    END IF
+    IF a$ = CHR$(0) + "K" THEN
+        ' Move left
+        cameraZSpeed = cameraZSpeed - COS(rotationAngleX) / 100
+        cameraXSpeed = cameraXSpeed - SIN(rotationAngleX) / 100
+    END IF
+    ' Change the viewing angle
+    IF a$ = CHR$(27) THEN SYSTEM
+    IF a$ = "4" THEN rotationAngleX = rotationAngleX + .1
+    IF a$ = "6" THEN rotationAngleX = rotationAngleX - .1
+    IF a$ = "2" THEN rotationAngleY = rotationAngleY + .1
+    IF a$ = "8" THEN rotationAngleY = rotationAngleY - .1
+    IF a$ = "-" THEN cameraYSpeed = cameraYSpeed + .01
+    IF a$ = "+" THEN cameraYSpeed = cameraYSpeed - .01
+    IF a$ = " " THEN cameraZSpeed = cameraZSpeed / 2: cameraXSpeed = cameraXSpeed / 2
+END IF
+
+' Calculate the speed and distance of the rocket
+v = SQR(rocketX * rocketX + rocketY * rocketY + rocketZ * rocketZ)
+s = SQR(rocketXSpeed * rocketXSpeed + rocketYSpeed * rocketYSpeed + rocketZSpeed * rocketZSpeed)
+
+' Display the current frame rate and other information
+IF timerString$ <> TIME$ THEN
+    timerString$ = TIME$
+    LOCATE 29, 1
+    PRINT "speed"; INT(s * 1000)
+    LOCATE 30, 1
+    PRINT "fps"; frameRate; "timeslice"; INT(timeSlice * 1000); "distance"; v;
+    ' Update the frame rate and time slice
+    frameRate = frameCount2
+    timeSlice = 1 / frameRate
+    frameCount2 = 0
+    ' Add new points to the scene
+    AddRocketTrailPoints
+    AddRocketTrailLine
+END IF
+GOTO 1
+
+SUB AddRocketTrailLine
+' Adds a new line to the scene to represent the rocket's trail.
+' It connects the current rocket position to the last added point, if any.
+pointCount = pointCount + 1
+pointX(pointCount) = rocketX
+pointY(pointCount) = rocketY
+pointZ(pointCount) = rocketZ
+
+' If there was a previous point, add a line connecting the previous point to the current point
+IF lastAddedPoint > 0 THEN
+    lineCount = lineCount + 1
+    lineStartPoint(lineCount) = lastAddedPoint
+    lineEndPoint(lineCount) = pointCount
+    lineColor(lineCount) = 13
+END IF
+lastAddedPoint = pointCount
+END SUB
+
+SUB AddRocketTrailPoints
+' Adds new points to the scene to represent the rocket's trail.
+' It adds three points forming a triangle to visualize the rocket's position.
+pointCount = pointCount + 1
+pointX(pointCount) = rocketX
+pointY(pointCount) = rocketY
+pointZ(pointCount) = rocketZ
+
+pointCount = pointCount + 1
+pointX(pointCount) = rocketX - .001
+pointY(pointCount) = rocketY - .001
+pointZ(pointCount) = rocketZ
+
+pointCount = pointCount + 1
+pointX(pointCount) = rocketX + .001
+pointY(pointCount) = rocketY - .001
+pointZ(pointCount) = rocketZ
+
+' Add lines connecting these points to form a triangle
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount
+lineEndPoint(lineCount) = pointCount - 1
+lineColor(lineCount) = 14
+
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount - 2
+lineEndPoint(lineCount) = pointCount - 1
+lineColor(lineCount) = 14
+
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount
+lineEndPoint(lineCount) = pointCount - 2
+lineColor(lineCount) = 14
+END SUB
+
+SUB GenerateEarth
+' Generates the points that make up the earth.
+' It uses nested loops to create points in a spherical shape for the earth
+' and adds lines to connect these points to form the earth's surface.
+tmpp = pointCount
+le2 = 0
+FOR z = -(earthRadius / 3) TO (earthRadius / 3) STEP earthStep
+    le = 0
+    le2 = le2 + 1
+    FOR x = -(earthRadius / 3) TO (earthRadius / 3) STEP earthStep
+        ' Check if the point is within the rocket's radius
+        IF SQR(x * x + z * z) > (earthRadius / 2.5) THEN GOTO 4
+        le = le + 1
+        ' Add the first point of the line
+        IF le = 1 THEN
+            xs = x / earthStep
+        END IF
+        pointCount = pointCount + 1
+        pointX(pointCount) = x
+        v = SQR(x * x + z * z)
+        pointY(pointCount) = SQR((v + (earthRadius / 2)) * ((earthRadius / 2) - v))
+        pointZ(pointCount) = z
+        ' Add the line to the list of lines
+        IF le > 1 THEN
+            lineCount = lineCount + 1
+            lineStartPoint(lineCount) = pointCount
+            lineEndPoint(lineCount) = pointCount - 1
+            lineColor(lineCount) = 3
+        END IF
+        ' Add the line to the list of lines if it is part of a circle
+        IF le2 > 1 THEN
+            IF xso > (x / earthStep) THEN GOTO 4
+            IF xso + leo <= (x / earthStep) THEN GOTO 4
+            lineCount = lineCount + 1
+            lineStartPoint(lineCount) = pointCount
+            lineEndPoint(lineCount) = pointCount - leo - xso + xs
+            lineColor(lineCount) = 3
+        END IF
+4
+    NEXT x
+    ' Update the variables for the next circle
+    leo = le
+    xso = xs
+NEXT z
+END SUB
+
+SUB GenerateRocket
+' Generates the points that make up the rocket.
+' It uses loops to create points in a cylindrical shape for the rocket body
+' and adds lines to connect these points to form the rocket's structure.
+' It also adds points and lines for the top and bottom of the rocket.
+s = 50
+FOR y = -9 TO 10 STEP rocketStep
+    st = pi * 2 / 6
+    IF y > 5 THEN
+        s = s - 3
+    END IF
+    IF y > 8 THEN
+        s = s - 6
+    END IF
+    FOR a = 0 TO pi * 2 STEP st
+        x1 = SIN(a) * s
+        z1 = COS(a) * s
+        pointCount = pointCount + 1
+        pointX(pointCount) = x1 * rocketScale
+        pointY(pointCount) = y * 50 * rocketScale
+        pointZ(pointCount) = z1 * rocketScale
+        ' Add the line to the list of lines
+        IF a > 0 THEN
+            lineCount = lineCount + 1
+            lineStartPoint(lineCount) = pointCount
+            lineEndPoint(lineCount) = pointCount - 1
+            lineColor(lineCount) = 10
+        END IF
+        ' Add the line to the list of lines if it is part of a circle
+        IF y > -9 THEN
+            lineCount = lineCount + 1
+            lineStartPoint(lineCount) = pointCount
+            lineEndPoint(lineCount) = pointCount - 7
+            lineColor(lineCount) = 10
+        END IF
+    NEXT a
+NEXT y
+
+' Add the points that make up the top of the rocket
+pointCount = pointCount + 1
+pointX(pointCount) = 0
+pointY(pointCount) = 11 * 50 * rocketScale
+pointZ(pointCount) = 0
+FOR a = 1 TO 6
+    lineCount = lineCount + 1
+    lineStartPoint(lineCount) = pointCount
+    lineEndPoint(lineCount) = pointCount - a
+    lineColor(lineCount) = 10
+NEXT a
+
+' Add the points that make up the bottom of the rocket
+pointCount = pointCount + 1
+pointX(pointCount) = -100 * rocketScale
+pointY(pointCount) = -450 * rocketScale
+pointZ(pointCount) = 0
+pointCount = pointCount + 1
+pointX(pointCount) = 100 * rocketScale
+pointY(pointCount) = -450 * rocketScale
+pointZ(pointCount) = 0
+pointCount = pointCount + 1
+pointX(pointCount) = 0
+pointY(pointCount) = -200 * rocketScale
+pointZ(pointCount) = 0
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount
+lineEndPoint(lineCount) = pointCount - 1
+lineColor(lineCount) = 12
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount - 2
+lineEndPoint(lineCount) = pointCount - 1
+lineColor(lineCount) = 12
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount
+lineEndPoint(lineCount) = pointCount - 2
+lineColor(lineCount) = 12
+pointCount = pointCount + 1
+pointX(pointCount) = 0
+pointY(pointCount) = -450 * rocketScale
+pointZ(pointCount) = -100 * rocketScale
+pointCount = pointCount + 1
+pointX(pointCount) = 0
+pointY(pointCount) = -450 * rocketScale
+pointZ(pointCount) = 100 * rocketScale
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount
+lineEndPoint(lineCount) = pointCount - 1
+lineColor(lineCount) = 12
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount - 2
+lineEndPoint(lineCount) = pointCount - 1
+lineColor(lineCount) = 12
+lineCount = lineCount + 1
+lineStartPoint(lineCount) = pointCount
+lineEndPoint(lineCount) = pointCount - 2
+lineColor(lineCount) = 12
+END SUB
+
+SUB InitializeScene
+' Initializes the graphics mode and sets up the initial scene.
+' It sets up the screen, initializes variables, adds initial points and lines,
+' and calls subroutines to generate the earth and the rocket.
+SCREEN 12
+VIEW PRINT 1 TO 30
+earthRadius = 12714
+earthStep = 500
+rocketStep = 4
+pi = 3.142657
+rocketScale = .00002
+frameCount2 = 0
+lastAddedPoint = -1
+pointX(1) = -.001
+pointY(1) = earthRadius / 2
+pointZ(1) = -.001
+pointX(2) = .001
+pointY(2) = earthRadius / 2
+pointZ(2) = -.001
+pointX(3) = .001
+pointY(3) = earthRadius / 2
+pointZ(3) = .001
+pointX(4) = -.001
+pointY(4) = earthRadius / 2
+pointZ(4) = .001
+pointCount = 4
+
+' Set up the initial lines that make up the rocket
+lineStartPoint(1) = 1
+lineEndPoint(1) = 2
+lineColor(1) = 14
+lineStartPoint(2) = 2
+lineEndPoint(2) = 3
+lineColor(2) = 14
+lineStartPoint(3) = 3
+lineEndPoint(3) = 4
+lineColor(3) = 14
+lineStartPoint(4) = 4
+lineEndPoint(4) = 1
+lineColor(4) = 14
+lineCount = 4
+
+' Initialize the observer position and velocity
+cameraX = 0
+cameraY = earthRadius * 2
+cameraZ = -35
+GenerateEarth
+cameraXSpeed = 0
+cameraYSpeed = 0
+cameraZSpeed = 0
+rotationAngleX = 0
+rocketStartPoint = pointCount + 1
+GenerateRocket
+rocketEndPoint = pointCount
+
+' Calculate the number of points that make up the rocket
+rocketPointCount = rocketEndPoint - rocketStartPoint + 1
+
+' Copy the initial points to the arrays for the rocket
+FOR a = 1 TO rocketPointCount
+    p = rocketStartPoint + a - 1
+    rocketPointX(a) = pointX(p)
+    rocketPointY(a) = pointY(p)
+    rocketPointZ(a) = pointZ(p)
+NEXT a
+END SUB
+
+SUB Render3DScene
+' Converts the 3D points to 2D for drawing on the screen.
+' It applies rotation transformations and projects the 3D points to 2D screen coordinates.
+' It then draws lines connecting the points if they are within the screen boundaries.
+s1 = SIN(rotationAngleX)
+c1 = COS(rotationAngleX)
+s2 = SIN(rotationAngleY)
+c2 = COS(rotationAngleY)
+FOR a = 1 TO pointCount
+    x = pointX(a) - cameraX
+    y = pointY(a) - cameraY
+    z = pointZ(a) - cameraZ
+    ' Apply the rotation transformations
+    x1 = x * s1 + z * c1
+    z1 = x * c1 - z * s1
+    y1 = z1 * s2 + y * c2
+    z2 = z1 * c2 - y * s2
+    ' Project the 3D point to 2D
+    IF z2 < .00001 THEN
+        onScreenPointX(a) = -1
+    ELSE
+        onScreenPointX(a) = x1 / z2 * 200 + 320
+        onScreenPointY(a) = 240 - y1 / z2 * 200
+        ' Check if the point is within the screen boundaries
+        IF onScreenPointX(a) < -50 OR onScreenPointX(a) > 1000 OR onScreenPointY(a) > 1000 THEN
+            onScreenPointX(a) = -1
+        END IF
+    END IF
+NEXT a
+
+' Draw the lines that make up the rocket
+FOR a = 1 TO lineCount
+    p1 = lineStartPoint(a)
+    p2 = lineEndPoint(a)
+    x1 = onScreenPointX(p1)
+    y1 = onScreenPointY(p1)
+    x2 = onScreenPointX(p2)
+    y2 = onScreenPointY(p2)
+    ' Check if the line is within the screen boundaries.
+    ' If so, erase line at old locations
+    IF oldScreenPointX1(a) = -1 OR oldScreenPointX2(a) = -1 THEN
+        ELSE
+            LINE (oldScreenPointX1(a), oldScreenPointY1(a))-(oldScreenPointX2(a), oldScreenPointY2(a)), 0
+    END IF
+    ' Draw the line if both endpoints are within the screen boundaries
+    IF x1 <> -1 AND x2 <> -1 THEN
+        LINE (x1, y1)-(x2, y2), lineColor(a)
+    END IF
+    ' Update the old endpoints of the line for the next frame
+    oldScreenPointX1(a) = x1
+    oldScreenPointY1(a) = y1
+    oldScreenPointX2(a) = x2
+    oldScreenPointY2(a) = y2
+NEXT a
+END SUB
+
diff --git a/3D GFX/Space/Rocket simulator.webm b/3D GFX/Space/Rocket simulator.webm
new file mode 100644
index 0000000..7e10602
Binary files /dev/null and b/3D GFX/Space/Rocket simulator.webm differ
diff --git a/3D GFX/Space/Stars.bas b/3D GFX/Space/Stars.bas
new file mode 100755
index 0000000..b9f9bf1
--- /dev/null
+++ b/3D GFX/Space/Stars.bas	
@@ -0,0 +1,142 @@
+' 3D Starfield Simulation.0
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.03, Initial version
+' 2024 - 2025, Improved code readability
+
+DECLARE SUB AddStar (xPosition AS SINGLE, yPosition AS SINGLE, zPosition AS SINGLE)
+DECLARE SUB CreateGalaxy ()
+
+Dim Shared totalStars As Integer
+Dim Shared maxStars As Integer
+
+Randomize Timer
+maxStars = 2000
+totalStars = maxStars
+starFieldDepth = 500
+
+Dim Shared starXPositions(1 To maxStars + 1000) As Single
+Dim Shared starYPositions(1 To maxStars + 1000) As Single
+Dim Shared starZPositions(1 To maxStars + 1000) As Single
+
+' Initialize the positions of the stars
+For starIndex = 1 To totalStars
+    starZPositions(starIndex) = Rnd * starFieldDepth + 20
+    angle = Rnd * 100
+    starXPositions(starIndex) = Sin(angle) * 20
+    starYPositions(starIndex) = Cos(angle) * 20
+Next starIndex
+
+Screen 13
+
+
+Do
+
+    ' Calculate the camera's rotation and position offsets
+    frameCount = frameCount + 1
+    cameraRotation = (3.1412 / 2) + Sin(frameCount / 35) / 100 + Sin(frameCount / 21) / 100
+    rs1 = Sin(cameraRotation)
+    rc1 = Cos(cameraRotation)
+
+    ' Update and draw each star
+    For starIndex = 1 To totalStars
+        x = starXPositions(starIndex)
+        y = starYPositions(starIndex)
+        z = starZPositions(starIndex)
+
+        ' Project the star's 3D position onto the 2D screen
+        projectedX = (x / z) * 160 + 160
+        projectedY = (y / z) * 100 + 100
+        PSet (projectedX, projectedY), 0 ' Erase the previous position
+
+        ' Rotate the star's position around the camera
+        x5 = x * rs1 - y * rc1
+        y5 = x * rc1 + y * rs1
+
+        ' Update the star's position with camera movement
+        x = x5 + Sin(frameCount / 21) * 3
+        y = y5 + Sin(frameCount / 18) * 3
+
+        ' Move the star closer to the viewer and wrap around if too close
+        z = z - 3
+        If z < 10 Then
+            z = Rnd * 300 + 400
+            x = Rnd * 800 - 400
+            y = Rnd * 800 - 400
+        End If
+
+        ' Project the new position and draw with perspective-based brightness
+        projectedX = (x / z) * 160 + 160
+        projectedY = (y / z) * 100 + 100
+        colorCode = 3000 / z + 15
+        If colorCode > 31 Then colorCode = 31
+        PSet (projectedX, projectedY), colorCode
+
+        ' Update the star's array positions
+        starXPositions(starIndex) = x
+        starYPositions(starIndex) = y
+        starZPositions(starIndex) = z
+    Next starIndex
+
+    ' Add new stars to the galaxy if needed
+    If maxStars - totalStars > Rnd * 800 + 100 Then CreateGalaxy: totalStars = totalStars + 1
+
+    ' Remove the two farthest stars and replace them with new ones
+    For a = 1 To 2
+        starIndex = Int(Rnd * (totalStars - 10)) + 1
+        Swap starXPositions(totalStars), starXPositions(starIndex)
+        Swap starYPositions(totalStars), starYPositions(starIndex)
+        Swap starZPositions(totalStars), starZPositions(starIndex)
+
+        x = starXPositions(totalStars)
+        y = starYPositions(totalStars)
+        z = starZPositions(totalStars)
+        projectedX = (x / z) * 160 + 160
+        projectedY = (y / z) * 100 + 100
+        PSet (projectedX, projectedY), 0 ' Erase the star
+        totalStars = totalStars - 1
+    Next a
+
+
+    ' Check for user input to exit the program
+    If InKey$ <> "" Then System
+
+    ' sleep, to limit framerate
+    Sound 0, 1
+Loop
+
+' Subroutine to create a new galaxy of stars
+Sub CreateGalaxy
+    xForce = Rnd * 4 - 2
+    yForce = Rnd * 4 - 2
+    xPositionOffset = Rnd * 200 - 100
+    yPositionOffset = Rnd * 200 - 100
+
+    ' Add a new set of stars with varying positions and velocities
+    For starIndex = 1 To Int(Rnd * 15) + 10 Step .04
+        x = Sin(starIndex) * starIndex * starIndex / 10
+        y = Cos(starIndex) * starIndex * starIndex / 10
+        AddStar x + RND * starIndex * starIndex / 30 + xPositionOffset, _
+                   y + RND * starIndex * starIndex / 30 + yPositionOffset, _
+                   700 + RND * starIndex * starIndex / 30 + (x * xForce) + (y * yForce)
+    Next starIndex
+
+    ' Play a sound when creating new stars (commented out)
+    ' SOUND 1000, 1
+End Sub
+
+' Subroutine to add a new star at the specified position
+Sub AddStar (xPosition As Single, yPosition As Single, zPosition As Single)
+    totalStars = totalStars + 1
+    starIndex = totalStars
+
+    starXPositions(starIndex) = xPosition
+    starYPositions(starIndex) = yPosition
+    starZPositions(starIndex) = zPosition
+End Sub
+
diff --git a/3D GFX/Space/Stars.webm b/3D GFX/Space/Stars.webm
new file mode 100644
index 0000000..39cd97e
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diff --git a/3D GFX/Space/Universe explorer/1.png b/3D GFX/Space/Universe explorer/1.png
new file mode 100644
index 0000000..ca51227
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diff --git a/3D GFX/Space/Universe explorer/2.png b/3D GFX/Space/Universe explorer/2.png
new file mode 100644
index 0000000..1b73573
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diff --git a/3D GFX/Space/Universe explorer/3.png b/3D GFX/Space/Universe explorer/3.png
new file mode 100644
index 0000000..1633045
Binary files /dev/null and b/3D GFX/Space/Universe explorer/3.png differ
diff --git a/3D GFX/Space/Universe explorer/Universe explorer.bas b/3D GFX/Space/Universe explorer/Universe explorer.bas
new file mode 100755
index 0000000..7fbbc9d
--- /dev/null
+++ b/3D GFX/Space/Universe explorer/Universe explorer.bas	
@@ -0,0 +1,731 @@
+' 3D Universe Explorer. User can freely fly around.
+' Universe is made of galaxy clusters.
+' Galaxy cluster is made of galaxies.
+' Galaxies are made of stars.
+
+' Total amount of stars in the universe is enormous.
+' This program implements clever algorithm to dynamically increase
+' and decrease level of detail of the universe regions depending
+' on where user is in the universe and maintaining reasonable
+' quantity of stars to render at any given time.
+
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+'
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024, Improved program readability
+
+DECLARE SUB loadScript (scriptName$)
+
+DECLARE SUB timerAdd (element!, time!, value!)
+DECLARE SUB timerinit ()
+DECLARE SUB timerprocess ()
+
+DECLARE SUB getCloudXYZ (a!, x1!, y1!, z2!)
+DECLARE FUNCTION gdist! (x!, y!, z!)
+DECLARE SUB mkworld ()
+DECLARE SUB galacloud (rx!, ry!, rz!)
+DECLARE SUB temp ()
+DECLARE SUB mkgalaxy (x!, y!, z!)
+DECLARE SUB rndinit ()
+DECLARE FUNCTION rn! ()
+DECLARE SUB disp ()
+DECLARE SUB startext ()
+DECLARE SUB control ()
+DECLARE SUB putbyte (addr!, dat!)
+DECLARE SUB putword (addr!, dat!)
+DECLARE FUNCTION getword! (addr!)
+DECLARE FUNCTION getbyte! (addr!)
+DECLARE SUB start ()
+DECLARE SUB animate ()
+
+DIM SHARED an1, an2, an3
+
+DIM SHARED tim
+
+DIM SHARED extSEG, extADDR
+
+' User position in the universe
+DIM SHARED myx, myy, myz
+' User velocity in the universe
+DIM SHARED myxs, myys, myzs
+' User pressed mouse buttons
+DIM SHARED buttL, buttR
+' Maximum user movement speed
+DIM SHARED maxmove
+
+' Zoom level
+DIM SHARED zoom
+DIM SHARED rndval(0 TO 10000)
+DIM SHARED rndp
+
+' Star positions and colors
+DIM SHARED px(1 TO 10000), py(1 TO 10000), pz(1 TO 10000)
+DIM SHARED pc(1 TO 10000)
+' Total number of stars
+DIM SHARED nump
+' User speed multiplier
+DIM SHARED myspd
+
+DIM SHARED tempr(0 TO 10)
+
+DIM SHARED vd
+
+DIM SHARED oftcloud(0 TO 3)
+
+' Galaxy positions
+DIM SHARED oftGalaX(0 TO 19), oftGalaY(0 TO 19), oftGalaZ(0 TO 19)
+
+DIM SHARED timerTime(0 TO 50, 0 TO 100)
+DIM SHARED timerValue(0 TO 50, 0 TO 100)
+
+DIM SHARED timerCplace(0 TO 50)
+DIM SHARED timerCtime(0 TO 50)
+DIM SHARED timerCvalue(0 TO 50)
+DIM SHARED timerLast
+
+DIM SHARED timerStartScript
+DIM SHARED ScriptRunning
+
+start
+
+cx = 0
+cy = 0
+cz = 0
+
+myx = 123456
+myy = 321
+myz = 23
+
+nump = 9999
+1
+' Initialize the universe
+mkworld
+
+va = INT(RND * 3)
+
+SELECT CASE va
+CASE 0
+  cx = RND * 500 - 250
+CASE 1
+  cy = RND * 100 - 50
+CASE 2
+  cz = RND * 500 - 250
+END SELECT
+
+' Handle user input and movement
+control
+
+' Display the universe
+disp
+
+' Process timers for scripted movements
+timerprocess
+
+' Copy screen buffer to main screen
+PCOPY 0, 1
+
+' Clear the screen
+CLS
+
+' Loop back to start
+GOTO 1
+
+SUB control
+
+' Handle mouse input
+IF getbyte(8) <> 0 THEN
+  putbyte 8, 0
+  xp = getword(2)
+  putword 2, 0
+  yp = getword(4)
+  putword 4, 0
+  butt = getword(6)
+  putword 6, 0
+
+  ' Determine which mouse buttons are pressed
+  buttL = 0
+  buttR = 0
+  IF butt = 1 THEN buttL = 1
+  IF butt = 2 THEN buttR = 1
+  IF butt = 3 THEN buttL = 1: buttR = 1
+
+  ' Handle right mouse button for up/down movement
+  IF buttR = 1 THEN
+    ' Handle both buttons pressed for back/front movement
+    IF buttL = 1 THEN
+      myxs = myxs + SIN(an1) * yp / 4
+      myzs = myzs - COS(an1) * yp / 4
+      GOTO 3
+    END IF
+
+    ' Handle right button for up/down movement
+    myys = myys + yp / 4
+3
+    yp = 0
+  END IF
+
+END IF
+
+' Clamp user input to maximum movement speed
+IF xp < -maxmove THEN xp = -maxmove
+IF xp > maxmove THEN xp = maxmove
+an1 = an1 - xp / 150
+
+IF yp < -maxmove THEN yp = -maxmove
+IF yp > maxmove THEN yp = maxmove
+an2 = an2 - yp / 150
+
+' Handle keyboard input for movement
+a$ = INKEY$
+
+IF a$ = "a" THEN myxs = myxs - COS(an1): myzs = myzs - SIN(an1)
+IF a$ = "d" THEN myxs = myxs + COS(an1): myzs = myzs + SIN(an1)
+IF a$ = "w" THEN myxs = myxs - SIN(an1): myzs = myzs + COS(an1)
+IF a$ = "s" THEN myxs = myxs + SIN(an1): myzs = myzs - COS(an1)
+
+' Handle keyboard input for speed multiplier
+IF a$ = "1" THEN myspd = .1
+IF a$ = "2" THEN myspd = 1
+IF a$ = "3" THEN myspd = 10
+IF a$ = "4" THEN myspd = 100
+IF a$ = "5" THEN myspd = 1000
+IF a$ = "6" THEN myspd = 10000
+IF a$ = "7" THEN myspd = 100000
+IF a$ = "8" THEN myspd = 1000000
+
+' Handle keyboard input for quitting the program
+IF a$ = "q" THEN SYSTEM
+
+' Handle keyboard input for recording script
+IF a$ = " " THEN
+  IF timerStartScript = 0 THEN
+    OPEN "script.dat" FOR OUTPUT AS #1
+    timerStartScript = TIMER
+  END IF
+  PRINT #1, TIMER - timerStartScript
+  PRINT #1, myx; myy; myz; an1; an2
+  SOUND 2000, .1
+END IF
+
+' Handle keyboard input for playing script
+IF a$ = "r" THEN
+  IF ScriptRunning = 0 THEN
+    timerinit
+    loadScript "script.dat"
+  ELSE
+    ScriptRunning = 0
+  END IF
+END IF
+
+' Friction to dampen movement speed over time
+myxs = myxs / 1.1
+myys = myys / 1.1
+myzs = myzs / 1.1
+
+' Update user position based on velocity and speed multiplier
+myx = myx + myxs * myspd
+myz = myz + myzs * myspd
+myy = myy + myys * myspd
+
+' Apply scripted movement if running
+IF ScriptRunning = 1 THEN
+  myx = timerCvalue(1)
+  myy = timerCvalue(2)
+  myz = timerCvalue(3)
+  an1 = timerCvalue(4)
+  an2 = timerCvalue(5)
+END IF
+
+END SUB
+
+SUB disp
+
+' Calculate sine and cosine for rotation
+s1 = SIN(an1)
+c1 = COS(an1)
+s2 = SIN(an2)
+c2 = COS(an2)
+
+' Initialize view distance
+vdn = 100000000
+
+' Loop through all stars to calculate their positions
+FOR a = 1 TO nump
+
+  ' Calculate star position relative to user
+  x = px(a) - myx
+  y = py(a) - myy
+  z = pz(a) - myz
+
+  ' Update view distance if star is closer
+  IF ABS(x) < vdn THEN
+    IF ABS(y) < vdn THEN
+      IF ABS(z) < vdn THEN vdn = SQR(x * x + y * y + z * z)
+    END IF
+  END IF
+
+  ' Rotate star position based on user orientation
+  x1 = x * c1 + z * s1
+  z1 = z * c1 - x * s1
+
+  y1 = y * c2 + z1 * s2
+  z2 = z1 * c2 - y * s2
+
+  ' Draw star if it is within view distance
+  IF z2 > 3 THEN
+    PSET (x1 / z2 * 130 + 160, y1 / z2 * 130 + 100), pc(a)
+  END IF
+
+NEXT a
+
+' Update average view distance
+vd = (vd * 5 + vdn) / 6
+
+END SUB
+
+SUB galacloud (rx, ry, rz)
+
+' Generate random cloud position
+a = INT(RND * 100)
+d = (a + 30) * 500
+
+x = d
+y = 0
+z = 0
+
+' Calculate sine and cosine for rotation
+a1 = SIN(a * (123.45 - (rx MOD 1235))) * 100
+a2 = SIN(a * 324 + (ry MOD 5431)) * 120
+
+s1 = SIN(a1)
+c1 = COS(a1)
+s2 = SIN(a2)
+c2 = COS(a2)
+
+' Rotate cloud position based on user orientation
+x1 = x * c1 + z * s1
+z1 = z * c1 - x * s1
+
+y1 = y * c2 + z1 * s2
+z2 = z1 * c2 - y * s2
+
+' Calculate distance from cloud to user
+fx = x1 + rx
+fy = y1 + ry
+fz = z2 + rz
+dist = gdist(fx, fy, fz)
+
+' Add cloud to galaxy list if within view distance
+IF dist < 20000 THEN
+  pl = INT(RND * 20)
+  oftGalaX(pl) = fx
+  oftGalaY(pl) = fy
+  oftGalaZ(pl) = fz
+  mkgalaxy fx, fy, fz
+ELSE
+  ' Add cloud to galaxy list if random or view distance is high
+  IF (RND * 100 < 10) OR (vd > 500000) THEN
+    mkgalaxy fx, fy, fz
+  END IF
+END IF
+
+END SUB
+
+FUNCTION gdist (x, y, z)
+' Calculate distance from user to given coordinates
+gdist = SQR((x - myx) ^ 2 + (y - myy) ^ 2 + (z - myz) ^ 2)
+
+END FUNCTION
+
+FUNCTION getbyte (addr)
+' Retrieve byte value at given RAM address
+getbyte = PEEK(extADDR + addr)
+
+END FUNCTION
+
+SUB getCloudXYZ (a, x1, y1, z2)
+
+d = a * 1000000
+
+x = d
+y = 0
+z = 0
+
+' Calculate sine and cosine for rotation
+a1 = SIN(a * 123) * 100
+a2 = SIN(a * 975) * 120
+
+s1 = SIN(a1)
+c1 = COS(a1)
+s2 = SIN(a2)
+c2 = COS(a2)
+
+' Rotate cloud position based on user orientation
+x1 = x * c1 + z * s1
+z1 = z * c1 - x * s1
+
+y1 = y * c2 + z1 * s2
+z2 = z1 * c2 - y * s2
+
+END SUB
+
+FUNCTION getword (addr)
+' Retrieve word value at given RAM address
+a = PEEK(extADDR + addr)
+b = PEEK(extADDR + addr + 1)
+
+c$ = HEX$(a)
+IF LEN(c$) = 1 THEN c$ = "0" + c$
+IF LEN(c$) = 0 THEN c$ = "00"
+
+c = VAL("&H" + HEX$(b) + c$)
+
+getword = c
+
+END FUNCTION
+
+SUB loadScript (scriptName$)
+' Load script from file and start playback
+ScriptRunning = 1
+rt = 2
+
+OPEN scriptName$ FOR INPUT AS #2
+
+5
+IF EOF(2) <> 0 THEN GOTO 6
+
+INPUT #2, t
+t = t / 2
+rt = rt + 6
+FOR a = 1 TO 5
+  INPUT #2, b
+  timerAdd a, rt, b
+NEXT a
+
+GOTO 5
+
+6
+CLOSE #2
+
+' Reset all timers to -1
+FOR a = 1 TO 5
+  timerAdd a, -1, b
+NEXT a
+
+END SUB
+
+SUB mkgalaxy (lx, ly, lz)
+
+' Skip galaxy generation if position is zero
+IF (lx = 0) AND (ly = 0) AND (lz = 0) THEN GOTO 4
+
+' Generate random seed for galaxy
+rndp = ABS(lx + ly + lz) MOD 9000
+n1 = rn * 100
+n2 = rn * 100
+n3 = rn * 100
+
+' Calculate sine and cosine for rotation
+gs1 = SIN(n1)
+gc1 = COS(n1)
+gs2 = SIN(n2)
+gc2 = COS(n2)
+gs3 = SIN(n3)
+gc3 = COS(n3)
+
+' Calculate galaxy size and temperature
+siz = rn * 50 + 75
+pi = 3.14
+sbm = INT(rn * 3) + 1
+
+' Calculate distance from galaxy to user
+dist = gdist(lx, ly, lz)
+
+' Determine number of stars based on distance
+amo = 1
+IF dist < 20000 THEN amo = 1
+IF dist < 5000 THEN amo = 2
+IF dist < 1000 THEN amo = 10
+IF dist < 500 THEN amo = 50
+
+' Generate stars in galaxy
+FOR a = 1 TO amo
+
+  ' Calculate random values for star position
+  b = RND * 10
+  s = b * b / 30
+
+  v1 = RND * (11.5 - b) / 3
+  v1p = v1 / 2
+
+  ane = RND * (s / 2) / sbm * 2
+  sba = 2 * pi / sbm * INT(RND * sbm)
+
+  x = (SIN(b - sba + ane) * s + RND * v1 - v1p) * siz
+  z = (COS(b - sba + ane) * s + RND * v1 - v1p) * siz
+  y = (RND * v1 - v1p) * siz
+
+  ' Rotate star position based on galaxy orientation
+  x1 = x * gc1 + z * gs1
+  z1 = z * gc1 - x * gs1
+
+  y1 = y * gc2 + z1 * gs2
+  z2 = z1 * gc2 - y * gs2
+
+  y2 = y1 * gc3 + x1 * gs3
+  x2 = x1 * gc3 - y1 * gs3
+
+  ' Add star to universe
+  pla = INT(RND * nump) + 1
+
+  px(pla) = x2 + lx
+  py(pla) = y2 + ly
+  pz(pla) = z2 + lz
+  pc(pla) = INT(RND * 15) + 1
+
+NEXT a
+
+4
+END SUB
+
+SUB mkworld
+
+' Generate initial galaxy clusters
+FOR b = 1 TO 10
+  a = INT(RND * 100)
+  getCloudXYZ a, x, y, z
+
+  ' Add cloud to galaxy list if within view distance
+  IF gdist(x, y, z) < vd * 3 THEN oftcloud(INT(RND * 4)) = a
+
+  ' Generate galaxy cluster at cloud position
+  galacloud x, y, z
+NEXT b
+
+' Add additional galaxy clusters if view distance is high
+IF vd < 4000000 THEN
+  FOR b = 0 TO 3
+    a = oftcloud(b)
+    getCloudXYZ a, x, y, z
+
+    ' Generate galaxy cluster at cloud position
+    galacloud x, y, z
+  NEXT b
+END IF
+
+' Add galaxies to universe if view distance is low
+IF vd < 10000 THEN
+
+  FOR b = 0 TO 19
+    x = oftGalaX(b)
+    y = oftGalaY(b)
+    z = oftGalaZ(b)
+
+    ' Generate galaxy at given position
+    mkgalaxy x, y, z
+  NEXT b
+
+ELSE
+END IF
+
+END SUB
+
+SUB putbyte (addr, dat)
+
+' Store byte value at given RAM address
+POKE (extADDR + addr), dat
+
+END SUB
+
+SUB putword (addr, dat)
+
+' Store word value at given RAM address
+b$ = HEX$(dat)
+
+2
+IF LEN(b$) < 4 THEN b$ = "0" + b$: GOTO 2
+
+n1 = VAL("&H" + LEFT$(b$, 2))
+n2 = VAL("&H" + RIGHT$(b$, 2))
+
+POKE (extADDR + addr), n2
+POKE (extADDR + addr + 1), n1
+
+END SUB
+
+FUNCTION rn
+
+' Generate random number based on current index
+rndp = rndp + 1
+IF rndp > 10000 THEN rndp = 0
+rn = rndval(rndp)
+
+END FUNCTION
+
+SUB rndinit
+
+' Initialize random number array
+FOR a = 0 TO 10000
+  rndval(a) = RND
+NEXT a
+
+rndp = 0
+
+END SUB
+
+SUB start
+
+PRINT "Universe Explorer"
+PRINT "by Svjatoslav Agejenko, n0@hot.ee"
+PRINT "2003.12"
+PRINT
+
+PRINT "Use mouse to aim."
+PRINT "Use keys: a, s, d, w  to move around,"
+PRINT "1 2 3 4 5 6 7 to change speed multiplier."
+PRINT "r - to start/stop demo."
+
+PRINT "right mouse button, to move UP <> DOWN."
+PRINT "both right & left mouse buttons pressed to move BACK <> FRONT."
+
+PRINT "At least P3 500 MHz, would be nice."
+PRINT "Better CPU, more details and higher framerate."
+PRINT "Requires mouse driver, and QBasic extension TSR"
+PRINT "to be loaded first."
+
+PRINT
+
+PRINT "In this program:"
+
+PRINT "Several stars, make up galaxy."
+PRINT "Several galaxies makes metagalaxy."
+PRINT "Several metagalaxies makes up universe."
+
+PRINT
+
+PRINT "Press Any key To Continue."
+a$ = INPUT$(1)
+
+startext
+
+SCREEN 7, , , 1
+
+maxmove = 50
+rndinit
+myspd = 1000000
+
+END SUB
+
+SUB startext
+
+' Read interrupt table to find QBasic extension TSR
+DEF SEG = 0
+
+extSEG = PEEK(&H79 * 4 + 3) * 256
+extSEG = extSEG + PEEK(&H79 * 4 + 2)
+
+PRINT "Segment is: " + HEX$(extSEG)
+
+extADDR = PEEK(&H79 * 4 + 1) * 256
+extADDR = extADDR + PEEK(&H79 * 4 + 0)
+
+PRINT "relative address is:"; extADDR
+
+DEF SEG = extSEG
+
+' Check if QBasic extension TSR is loaded
+IF getword(0) <> 1983 THEN
+  PRINT "FATAL ERROR:  you must load"
+  PRINT "QBasic extension TSR first!"
+  SYSTEM
+END IF
+
+END SUB
+
+SUB timerAdd (element, time, value)
+
+' Add timer event to list
+FOR a = 0 TO 100
+  IF (timerTime(element, a) = 0) AND (timerValue(element, a) = 0) THEN GOTO timer3
+NEXT a
+timer3:
+
+timerTime(element, a) = time
+timerValue(element, a) = value
+
+END SUB
+
+SUB timerdisp
+LOCATE 1, 1
+
+' Display all active timers
+FOR a = 0 TO 10
+  PRINT timerCplace(a), timerCtime(a), timerCvalue(a)
+NEXT a
+
+END SUB
+
+SUB timerinit
+
+' Initialize all timers to zero
+timerLast = TIMER
+
+FOR a = 1 TO 50
+  FOR b = 1 TO 100
+    timerTime(a, b) = 0
+    timerValue(a, b) = 0
+  NEXT b
+NEXT a
+
+END SUB
+
+SUB timerprocess
+
+' Process all active timers
+timerCurrent = TIMER
+timerDiff = timerCurrent - timerLast
+timerLast = timerCurrent
+
+FOR a = 0 TO 50
+  ctim = timerCtime(a) + timerDiff
+  Cplace = timerCplace(a)
+timer2:
+  IF timerTime(a, Cplace + 1) = -1 THEN
+    ctim = 0
+    Cplace = 0
+  END IF
+  IF timerTime(a, Cplace + 1) < ctim THEN
+    IF timerTime(a, Cplace + 1) = 0 THEN
+      timerCvalue(a) = timerValue(a, Cplace)
+      GOTO timer1:
+    END IF
+    Cplace = Cplace + 1
+    GOTO timer2
+  END IF
+
+  v1 = timerValue(a, Cplace)
+  t1 = timerTime(a, Cplace)
+  v2 = timerValue(a, Cplace + 1)
+  t2 = timerTime(a, Cplace + 1)
+
+  ' Interpolate between two timer values
+  IF v1 = v2 THEN
+    timerCvalue(a) = v1
+  ELSE
+    Tdiff1 = t2 - t1
+    Tdiff2 = ctim - t1
+    Vdiff = v2 - v1
+    timerCvalue(a) = Tdiff2 / Tdiff1 * Vdiff + v1
+  END IF
+timer1:
+  timerCplace(a) = Cplace
+  timerCtime(a) = ctim
+NEXT a
+
+END SUB
diff --git a/3D GFX/Space/Universe explorer/index.html b/3D GFX/Space/Universe explorer/index.html
new file mode 100644
index 0000000..2daf567
--- /dev/null
+++ b/3D GFX/Space/Universe explorer/index.html	
@@ -0,0 +1,45 @@
+<HTML>
+<HEAD><TITLE>Universe Explorer</TITLE></HEAD>
+
+<BODY text=#A0A0ff vLink=#0000ff aLink=#0000ff link=#0000ff bgColor=#000000>
+
+<CENTER><H1>Universe Explorer</H1></CENTER>
+<BR>
+<BR>
+This QBasic program draws 3D universe consisting of stars in realtime.
+
+Stars form different galaxies, and galaxies in turn form metagalaxies, witch
+finally form universe.
+
+Program allows you to freely fly around using mouse and the keyboard.
+In this simulation universe consists from many millions of stars.
+Since QBasic cannot handle large arrays it was quite an art to
+invent and optimize formula witch syntheszies any part of the
+universe on demand. Every galaxy and metagalaxy is unique.
+When user flies near to some galaxy, it will be synthezied,
+and detail level will increase.
+<BR><BR><BR>
+<BR><b>single metagalaxy</b>
+<BR><IMG SRC="3.png">
+<BR><BR><BR>
+<BR><b>single galaxy</b>
+<BR><IMG SRC="1.png">
+<BR><BR><BR>
+<BR><b>another galaxy</b>
+<BR><IMG SRC="2.png">
+<BR>
+<BR><pre>
+<code>
+Requirements:
+	CPU 500 MHz or better
+	MS QBasic (preferably QB 4.5)
+	QBEXT TSR (included)
+
+Running program:
+	Since QB has no mouse support there is workaround hack: QBEXT.
+	Thats a tiny TSR that must be loaded first to allow
+	mouse usage.
+</code>
+</pre>
+</BODY>
+</HTML>
\ No newline at end of file
diff --git a/3D GFX/Space/Universe explorer/qbext.com b/3D GFX/Space/Universe explorer/qbext.com
new file mode 100755
index 0000000..ae54fc4
Binary files /dev/null and b/3D GFX/Space/Universe explorer/qbext.com differ
diff --git a/3D GFX/Space/Universe explorer/run.bat b/3D GFX/Space/Universe explorer/run.bat
new file mode 100755
index 0000000..15e61be
--- /dev/null
+++ b/3D GFX/Space/Universe explorer/run.bat	
@@ -0,0 +1,2 @@
+qbext
+qb /run expluniv.bas
\ No newline at end of file
diff --git a/3D GFX/Space/index.html b/3D GFX/Space/index.html
new file mode 100644
index 0000000..d6e9b43
--- /dev/null
+++ b/3D GFX/Space/index.html	
@@ -0,0 +1,334 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2025-07-28 ma 03:33 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Space themed 3D graphics</title>
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
+  .subtitle { text-align: center;
+              font-size: medium;
+              font-weight: bold;
+              margin-top:0; }
+  .todo   { font-family: monospace; color: red; }
+  .done   { font-family: monospace; color: green; }
+  .priority { font-family: monospace; color: orange; }
+  .tag    { background-color: #eee; font-family: monospace;
+            padding: 2px; font-size: 80%; font-weight: normal; }
+  .timestamp { color: #bebebe; }
+  .timestamp-kwd { color: #5f9ea0; }
+  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
+  .org-left   { margin-left: 0px;  margin-right: auto; text-align: left; }
+  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #e6e6e6;
+    border-radius: 3px;
+    background-color: #f2f2f2;
+    padding: 8pt;
+    font-family: monospace;
+    overflow: auto;
+    margin: 1.2em;
+  }
+  pre.src {
+    position: relative;
+    overflow: auto;
+  }
+  pre.src:before {
+    display: none;
+    position: absolute;
+    top: -8px;
+    right: 12px;
+    padding: 3px;
+    color: #555;
+    background-color: #f2f2f299;
+  }
+  pre.src:hover:before { display: inline; margin-top: 14px;}
+  /* Languages per Org manual */
+  pre.src-asymptote:before { content: 'Asymptote'; }
+  pre.src-awk:before { content: 'Awk'; }
+  pre.src-authinfo::before { content: 'Authinfo'; }
+  pre.src-C:before { content: 'C'; }
+  /* pre.src-C++ doesn't work in CSS */
+  pre.src-clojure:before { content: 'Clojure'; }
+  pre.src-css:before { content: 'CSS'; }
+  pre.src-D:before { content: 'D'; }
+  pre.src-ditaa:before { content: 'ditaa'; }
+  pre.src-dot:before { content: 'Graphviz'; }
+  pre.src-calc:before { content: 'Emacs Calc'; }
+  pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
+  pre.src-fortran:before { content: 'Fortran'; }
+  pre.src-gnuplot:before { content: 'gnuplot'; }
+  pre.src-haskell:before { content: 'Haskell'; }
+  pre.src-hledger:before { content: 'hledger'; }
+  pre.src-java:before { content: 'Java'; }
+  pre.src-js:before { content: 'Javascript'; }
+  pre.src-latex:before { content: 'LaTeX'; }
+  pre.src-ledger:before { content: 'Ledger'; }
+  pre.src-lisp:before { content: 'Lisp'; }
+  pre.src-lilypond:before { content: 'Lilypond'; }
+  pre.src-lua:before { content: 'Lua'; }
+  pre.src-matlab:before { content: 'MATLAB'; }
+  pre.src-mscgen:before { content: 'Mscgen'; }
+  pre.src-ocaml:before { content: 'Objective Caml'; }
+  pre.src-octave:before { content: 'Octave'; }
+  pre.src-org:before { content: 'Org mode'; }
+  pre.src-oz:before { content: 'OZ'; }
+  pre.src-plantuml:before { content: 'Plantuml'; }
+  pre.src-processing:before { content: 'Processing.js'; }
+  pre.src-python:before { content: 'Python'; }
+  pre.src-R:before { content: 'R'; }
+  pre.src-ruby:before { content: 'Ruby'; }
+  pre.src-sass:before { content: 'Sass'; }
+  pre.src-scheme:before { content: 'Scheme'; }
+  pre.src-screen:before { content: 'Gnu Screen'; }
+  pre.src-sed:before { content: 'Sed'; }
+  pre.src-sh:before { content: 'shell'; }
+  pre.src-sql:before { content: 'SQL'; }
+  pre.src-sqlite:before { content: 'SQLite'; }
+  /* additional languages in org.el's org-babel-load-languages alist */
+  pre.src-forth:before { content: 'Forth'; }
+  pre.src-io:before { content: 'IO'; }
+  pre.src-J:before { content: 'J'; }
+  pre.src-makefile:before { content: 'Makefile'; }
+  pre.src-maxima:before { content: 'Maxima'; }
+  pre.src-perl:before { content: 'Perl'; }
+  pre.src-picolisp:before { content: 'Pico Lisp'; }
+  pre.src-scala:before { content: 'Scala'; }
+  pre.src-shell:before { content: 'Shell Script'; }
+  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
+  /* additional language identifiers per "defun org-babel-execute"
+       in ob-*.el */
+  pre.src-cpp:before  { content: 'C++'; }
+  pre.src-abc:before  { content: 'ABC'; }
+  pre.src-coq:before  { content: 'Coq'; }
+  pre.src-groovy:before  { content: 'Groovy'; }
+  /* additional language identifiers from org-babel-shell-names in
+     ob-shell.el: ob-shell is the only babel language using a lambda to put
+     the execution function name together. */
+  pre.src-bash:before  { content: 'bash'; }
+  pre.src-csh:before  { content: 'csh'; }
+  pre.src-ash:before  { content: 'ash'; }
+  pre.src-dash:before  { content: 'dash'; }
+  pre.src-ksh:before  { content: 'ksh'; }
+  pre.src-mksh:before  { content: 'mksh'; }
+  pre.src-posh:before  { content: 'posh'; }
+  /* Additional Emacs modes also supported by the LaTeX listings package */
+  pre.src-ada:before { content: 'Ada'; }
+  pre.src-asm:before { content: 'Assembler'; }
+  pre.src-caml:before { content: 'Caml'; }
+  pre.src-delphi:before { content: 'Delphi'; }
+  pre.src-html:before { content: 'HTML'; }
+  pre.src-idl:before { content: 'IDL'; }
+  pre.src-mercury:before { content: 'Mercury'; }
+  pre.src-metapost:before { content: 'MetaPost'; }
+  pre.src-modula-2:before { content: 'Modula-2'; }
+  pre.src-pascal:before { content: 'Pascal'; }
+  pre.src-ps:before { content: 'PostScript'; }
+  pre.src-prolog:before { content: 'Prolog'; }
+  pre.src-simula:before { content: 'Simula'; }
+  pre.src-tcl:before { content: 'tcl'; }
+  pre.src-tex:before { content: 'TeX'; }
+  pre.src-plain-tex:before { content: 'Plain TeX'; }
+  pre.src-verilog:before { content: 'Verilog'; }
+  pre.src-vhdl:before { content: 'VHDL'; }
+  pre.src-xml:before { content: 'XML'; }
+  pre.src-nxml:before { content: 'XML'; }
+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
+  caption.t-above { caption-side: top; }
+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
+  th.org-left   { text-align: center;   }
+  th.org-center { text-align: center; }
+  td.org-right  { text-align: right;  }
+  td.org-left   { text-align: left;   }
+  td.org-center { text-align: center; }
+  dt { font-weight: bold; }
+  .footpara { display: inline; }
+  .footdef  { margin-bottom: 1em; }
+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
+  .org-info-js_info-navigation { border-style: none; }
+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
+<style type="text/css">
+               body {
+                 max-width: 35cm !important;
+               }
+               #content {
+                 max-width: 80em !important;
+                 width: 90%;
+               }
+               </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">Space themed 3D graphics</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#org3423fbf">1. Galaxy explorer</a></li>
+<li><a href="#org514bffe">2. Rocket simulator</a></li>
+<li><a href="#orgadb0264">3. Stars</a></li>
+<li><a href="#org9c279ca">4. Universe explorer</a></li>
+</ul>
+</div>
+</div>
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+
+<div id="outline-container-org3423fbf" class="outline-2">
+<h2 id="org3423fbf"><span class="section-number-2">1.</span> Galaxy explorer</h2>
+<div class="outline-text-2" id="text-1">
+<p>
+TODO: add description
+</p>
+
+
+<div id="org99ca7c0" class="figure">
+<p><a href="Galaxy%20explorer.bas" class="responsive-img"><img src="Galaxy%20explorer.png" alt="Galaxy%20explorer.png" class="responsive-img" /></a>
+</p>
+</div>
+
+<p>
+<a href="!.bas">Source code</a>
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-org514bffe" class="outline-2">
+<h2 id="org514bffe"><span class="section-number-2">2.</span> Rocket simulator</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+TODO: add description
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Rocket simulator.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="Rocket simulator.bas">Source code</a>
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-orgadb0264" class="outline-2">
+<h2 id="orgadb0264"><span class="section-number-2">3.</span> Stars</h2>
+<div class="outline-text-2" id="text-3">
+<p>
+TODO: add description
+</p>
+
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Stars.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+
+<p>
+<a href="Stars.bas">Source code</a>
+</p>
+</div>
+</div>
+
+<div id="outline-container-org9c279ca" class="outline-2">
+<h2 id="org9c279ca"><span class="section-number-2">4.</span> Universe explorer</h2>
+<div class="outline-text-2" id="text-4">
+<p>
+TODO: add description
+</p>
+
+
+<div id="org080be9c" class="figure">
+<p><a href="Universe%20explorer/Universe%20explorer.bas" class="responsive-img"><img src="Universe%20explorer/1.png" alt="1.png" class="responsive-img" /></a>
+</p>
+</div>
+
+
+<div id="org83b6225" class="figure">
+<p><a href="Universe%20explorer/Universe%20explorer.bas" class="responsive-img"><img src="Universe%20explorer/2.png" alt="2.png" class="responsive-img" /></a>
+</p>
+</div>
+
+
+<div id="org31f0834" class="figure">
+<p><a href="Universe%20explorer/Universe%20explorer.bas" class="responsive-img"><img src="Universe%20explorer/3.png" alt="3.png" class="responsive-img" /></a>
+</p>
+</div>
+
+<p>
+<a href="!.bas">Source code</a>
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2025-07-28 ma 03:33</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/3D GFX/Space/index.org b/3D GFX/Space/index.org
new file mode 100644
index 0000000..8f0b931
--- /dev/null
+++ b/3D GFX/Space/index.org	
@@ -0,0 +1,87 @@
+#+TITLE: Space themed 3D graphics
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+#+begin_export html
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+#+end_export
+
+* Galaxy explorer
+
+TODO: add description
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Galaxy%20explorer.bas][file:Galaxy%20explorer.png]]
+
+[[file:!.bas][Source code]]
+
+
+* Rocket simulator
+
+TODO: add description
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Rocket simulator.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Rocket simulator.bas][Source code]]
+
+
+* Stars
+
+TODO: add description
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Stars.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Stars.bas][Source code]]
+
+* Universe explorer
+
+TODO: add description
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Universe%20explorer/Universe%20explorer.bas][file:Universe%20explorer/1.png]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Universe%20explorer/Universe%20explorer.bas][file:Universe%20explorer/2.png]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Universe%20explorer/Universe%20explorer.bas][file:Universe%20explorer/3.png]]
+
+[[file:!.bas][Source code]]
diff --git a/3D GFX/Space/logo.png b/3D GFX/Space/logo.png
new file mode 100644
index 0000000..d0121eb
Binary files /dev/null and b/3D GFX/Space/logo.png differ
diff --git a/3D GFX/Space/qbext.com b/3D GFX/Space/qbext.com
new file mode 100755
index 0000000..ae54fc4
Binary files /dev/null and b/3D GFX/Space/qbext.com differ
diff --git a/3D GFX/Swapping 3D engine/engine.bas b/3D GFX/Swapping 3D engine/engine.bas
new file mode 100755
index 0000000..a23a9a3
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/engine.bas	
@@ -0,0 +1,937 @@
+DECLARE SUB createLongLine (x1!, y1!, z1!, x2!, y2!, z2!, c!)
+DECLARE SUB makeGrid (x1!, y1!, z1!, x2!, y2!, z2!)
+DECLARE SUB prn (a$, x!, y!, z!)
+DECLARE SUB fill4 ()
+DECLARE SUB loadObject (name$, x!, y!, z!)
+DECLARE SUB putChar (a$, x!, y!, z!)
+
+' 3D engine that can theoretically render infinite wireframe 3D worlds.
+' This is accomplished by partitioning world into cube shaped fragments.
+' Fragments are dynamically loaded into RAM and offloaded from RAM to disk
+' while user moves around in world.
+'
+' As a result, huge world can be stored on-disk while only necessary part of it
+' in close proximity is kept in limited RAM.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2004.1 - Initial version
+'
+
+DECLARE SUB fill3 ()
+DECLARE SUB fill1 ()
+DECLARE SUB fill2 ()
+DECLARE SUB addMsg (a$)
+DECLARE SUB dispmsg ()
+DECLARE SUB loadArea (tx1!, ty1!, tz1!, tx2!, ty2!, tz2!)
+DECLARE SUB loadCluster (x!, y!, z!)
+DECLARE SUB checkVisibility ()
+DECLARE SUB decVisibility ()
+DECLARE SUB applyBounds ()
+DECLARE SUB clearWorld ()
+DECLARE SUB createNewLine (x1!, y1!, z1!, x2!, y2!, z2!, c!)
+DECLARE SUB createWorld ()
+DECLARE FUNCTION getClustName$ (a!, b!, c!)
+DECLARE FUNCTION toStr$ (a!)
+
+DECLARE SUB insertLine (x1!, y1!, z1!, x2!, y2!, z2!, c!)
+DECLARE SUB startext ()
+DECLARE SUB control ()
+DECLARE SUB putbyte (addr!, dat!)
+DECLARE SUB putword (addr!, dat!)
+DECLARE FUNCTION getword! (addr!)
+DECLARE FUNCTION getbyte! (addr!)
+DECLARE SUB start ()
+DECLARE SUB render ()
+
+
+DIM SHARED an1, an2
+
+DIM SHARED extSEG, extADDR
+DIM SHARED buttL, buttR
+DIM SHARED maxmove
+
+DIM SHARED linAmo
+linAmo = 5000
+
+DIM SHARED linX1(0 TO linAmo) AS INTEGER
+DIM SHARED linY1(0 TO linAmo) AS INTEGER
+DIM SHARED linZ1(0 TO linAmo) AS INTEGER
+DIM SHARED linX2(0 TO linAmo) AS INTEGER
+DIM SHARED linY2(0 TO linAmo) AS INTEGER
+DIM SHARED linZ2(0 TO linAmo) AS INTEGER
+DIM SHARED linC(0 TO linAmo) AS INTEGER
+
+DIM SHARED myx, myy, myz
+DIM SHARED myxs, myys, myzs
+
+DIM SHARED curFreeLine
+DIM SHARED worldSize
+
+DIM SHARED usedLines
+DIM SHARED desMaxLines
+
+DIM SHARED visMaxX, visMaxY, visMaxZ
+DIM SHARED visMinX, visMinY, visMinZ
+
+DIM SHARED visDist
+DIM SHARED msgs$(1 TO 10)
+DIM SHARED frm
+
+
+'DIM SHARED blkData(1 TO 50) AS STRING * 512
+'DIM SHARED blkFrag(1 TO 50) AS STRING * 512
+
+
+
+
+nl = 0
+np = 0
+
+start
+
+
+cx = 0
+cy = 0
+cz = 0
+
+np = 1
+px(1) = 0
+py(1) = 0
+pz(1) = 0
+
+makeGrid -400, -400, -400, 400, 400, 400
+
+1
+frm = frm + 1
+
+'fill1
+fill2
+fill3
+fill4
+
+
+control
+
+render
+
+LOCATE 1, 1
+PRINT usedLines, visDist
+
+checkVisibility
+
+PCOPY 0, 1
+CLS
+GOTO 1
+
+SUB addMsg (a$)
+
+FOR a = 1 TO 9
+  msgs$(a) = msgs$(a + 1)
+NEXT a
+
+msgs$(10) = a$
+END SUB
+
+SUB applyBounds
+
+FOR a = 0 TO linAmo
+  IF linC(a) > 0 THEN
+
+
+    cx = (linX1(a) + linX2(a)) / 2
+    cy = (linY1(a) + linY2(a)) / 2
+    cz = (linZ1(a) + linZ2(a)) / 2
+   
+    clx = INT(cx / 100)
+    cly = INT(cy / 100)
+    clz = INT(cz / 100)
+
+    IF clx > visMaxX THEN GOTO 8
+    IF clx < visMinX THEN GOTO 8
+   
+    IF cly > visMaxY THEN GOTO 8
+    IF cly < visMinY THEN GOTO 8
+
+    IF clz > visMaxZ THEN GOTO 8
+    IF clz < visMinZ THEN GOTO 8
+
+    GOTO 7
+8   linC(a) = -1
+    usedLines = usedLines - 1
+  END IF
+7
+NEXT a
+
+END SUB
+
+SUB checkVisibility
+
+'DIM SHARED visMaxX, visMaxY, visMaxZ
+'DIM SHARED visMinX, visMinY, visMinZ
+
+
+mx = INT(myx / 100)
+my = INT(myy / 100)
+mz = INT(myz / 100)
+
+
+IF mx + visDist > visMaxX THEN
+  newX = mx + visDist
+  loadArea visMaxX + 1, visMinY, visMinZ, newX, visMaxY, visMaxZ
+  visMaxX = newX
+  LOCATE 1, 30
+  PRINT "1"
+END IF
+IF mx - visDist < visMinX THEN
+  newX = mx - visDist
+  loadArea visMinX - 1, visMinY, visMinZ, newX, visMaxY, visMaxZ
+  visMinX = newX
+  LOCATE 1, 30
+  PRINT "2"
+END IF
+
+
+IF my + visDist > visMaxY THEN
+  newY = my + visDist
+  loadArea visMinX, visMaxY + 1, visMinZ, visMaxX, newY, visMaxZ
+  visMaxY = newY
+  LOCATE 1, 30
+  PRINT "3"
+END IF
+IF my - visDist < visMinY THEN
+  newY = my - visDist
+  loadArea visMinX, visMinY - 1, visMinZ, visMaxX, newY, visMaxZ
+  visMinY = newY
+  LOCATE 1, 30
+  PRINT "4"
+END IF
+
+
+IF mz + visDist > visMaxZ THEN
+  newZ = mz + visDist
+  loadArea visMinX, visMinY, visMaxZ + 1, visMaxX, visMaxY, newZ
+  visMaxZ = newZ
+  LOCATE 1, 30
+  PRINT "5"
+END IF
+IF mz - visDist < visMinZ THEN
+  newZ = mz - visDist
+  loadArea visMinX, visMinY, visMinZ - 1, visMaxX, visMaxY, newZ
+  visMinZ = newZ
+  LOCATE 1, 30
+  PRINT "6"
+END IF
+
+
+IF usedLines > desMaxLines THEN decVisibility
+
+END SUB
+
+SUB clearWorld
+
+
+CHDIR "world"
+
+FOR x = -worldSize TO worldSize
+
+  n$ = "X" + toStr$(x)
+  CHDIR n$
+
+  FOR y = -worldSize TO worldSize
+
+    n2$ = "Y" + toStr$(y)
+    CHDIR n2$
+
+    PRINT x, y
+    FOR z = -worldSize TO worldSize
+
+      n3$ = "z" + toStr$(z) + ".dat"
+      OPEN n3$ FOR OUTPUT AS #1
+'      PRINT #1, "0"
+      CLOSE #1
+    NEXT z
+
+    CHDIR ".."
+  NEXT y
+
+  CHDIR ".."
+NEXT x
+
+CHDIR ".."
+
+END SUB
+
+SUB control
+
+
+IF getbyte(8) <> 0 THEN
+  putbyte 8, 0
+  xp = getword(2)
+  putword 2, 0
+  yp = getword(4)
+  putword 4, 0
+  butt = getword(6)
+  putword 6, 0
+  buttL = 0
+  buttR = 0
+  IF butt = 1 THEN buttL = 1
+  IF butt = 2 THEN buttR = 1
+  IF butt = 3 THEN buttL = 1: buttR = 1
+
+
+  IF buttR = 1 THEN
+    IF buttL = 1 THEN
+      myxs = myxs + SIN(an1) * yp / 4
+      myzs = myzs - COS(an1) * yp / 4
+      GOTO 3
+    END IF
+    myys = myys + yp / 4
+3
+    yp = 0
+  END IF
+
+END IF
+
+
+
+
+IF xp < -maxmove THEN xp = -maxmove
+IF xp > maxmove THEN xp = maxmove
+an1 = an1 - xp / 150
+
+IF yp < -maxmove THEN yp = -maxmove
+IF yp > maxmove THEN yp = maxmove
+an2 = an2 - yp / 150
+
+
+
+a$ = INKEY$
+
+IF a$ = "a" THEN myxs = myxs - COS(an1): myzs = myzs - SIN(an1)
+IF a$ = "d" THEN myxs = myxs + COS(an1): myzs = myzs + SIN(an1)
+IF a$ = "w" THEN myxs = myxs - SIN(an1): myzs = myzs + COS(an1)
+IF a$ = "s" THEN myxs = myxs + SIN(an1): myzs = myzs - COS(an1)
+IF a$ = "q" THEN SYSTEM
+
+myxs = myxs / 1.1
+myys = myys / 1.1
+myzs = myzs / 1.1
+
+myx = myx + myxs
+myz = myz + myzs
+myy = myy + myys
+
+END SUB
+
+SUB createLongLine (x1, y1, z1, x2, y2, z2, c)
+d = SQR((x1 - x2) ^ 2 + (y1 - y2) ^ 2 + (z1 - z2) ^ 2)
+
+IF d < 100 THEN
+  createNewLine x1, y1, z1, x2, y2, z2, c
+ELSE
+  xp = (x1 + x2) / 2
+  yp = (y1 + y2) / 2
+  zp = (z1 + z2) / 2
+  createLongLine x1, y1, z1, xp, yp, zp, c
+  createLongLine xp, yp, zp, x2, y2, z2, c
+END IF
+END SUB
+
+SUB createNewLine (x1, y1, z1, x2, y2, z2, c)
+
+cx = (x1 + x2) / 2
+cy = (y1 + y2) / 2
+cz = (z1 + z2) / 2
+
+clx = INT(cx / 100)
+cly = INT(cy / 100)
+clz = INT(cz / 100)
+
+IF clx >= visMinX THEN
+  IF clx <= visMaxX THEN
+    IF cly >= visMinY THEN
+      IF cly <= visMaxY THEN
+        IF clz >= visMinZ THEN
+          IF clz <= visMaxZ THEN
+            insertLine x1, y1, z1, x2, y2, z2, c
+          END IF
+        END IF
+      END IF
+    END IF
+  END IF
+END IF
+
+cln$ = getClustName(clx, cly, clz)
+
+' PRINT "Cluster name:" + cln$
+OPEN cln$ FOR APPEND AS #1
+  PRINT #1, x1; y1; z1; x2; y2; z2; c
+CLOSE #1
+
+END SUB
+
+SUB createWorld
+
+
+
+CHDIR "world"
+
+FOR x = -worldSize TO worldSize
+ 
+  n$ = "X" + toStr$(x)
+  MKDIR n$
+  CHDIR n$
+
+  FOR y = -worldSize TO worldSize
+
+    n2$ = "Y" + toStr$(y)
+    MKDIR n2$
+    CHDIR n2$
+
+    PRINT x, y
+    FOR z = -worldSize TO worldSize
+
+      n3$ = "z" + toStr$(z) + ".dat"
+      OPEN n3$ FOR OUTPUT AS #1
+'      PRINT #1, "0"
+      CLOSE #1
+    NEXT z
+
+    CHDIR ".."
+  NEXT y
+
+  CHDIR ".."
+NEXT x
+
+CHDIR ".."
+
+END SUB
+
+SUB decVisibility
+
+mx = INT(myx / 100)
+my = INT(myy / 100)
+mz = INT(myz / 100)
+
+6
+de = 0
+
+IF visMaxX > mx + visDist THEN
+  visMaxX = mx + visDist
+  de = 1
+END IF
+
+IF visMinX < mx - visDist THEN
+  visMinX = mx - visDist
+  de = 1
+END IF
+
+
+IF visMaxY > my + visDist THEN
+  visMaxY = my + visDist
+  de = 1
+END IF
+
+IF visMinY < my - visDist THEN
+  visMinY = my - visDist
+  de = 1
+END IF
+
+
+IF visMaxZ > mz + visDist THEN
+  visMaxZ = mz + visDist
+  de = 1
+END IF
+
+IF visMinZ < mz - visDist THEN
+  visMinZ = mz - visDist
+  de = 1
+END IF
+
+IF de = 0 THEN
+  IF visDist > 3 THEN visDist = visDist - 1: GOTO 6
+ELSE
+  addMsg "Visibility decareased"
+END IF
+
+
+applyBounds
+END SUB
+
+SUB dispmsg
+FOR a = 1 TO 10
+  LOCATE a, 39 - LEN(msgs$(a))
+  PRINT msgs$(a)
+NEXT a
+END SUB
+
+SUB fill1
+
+x1 = RND * 800 - 400
+y1 = RND * 800 - 400
+z1 = RND * 800 - 400
+
+x2 = x1 + RND * 20
+y2 = y1 + RND * 20
+z2 = z1 + RND * 20
+
+createNewLine x1, y1, z1, x2, y2, z2, INT(RND * 15) + 1
+
+END SUB
+
+SUB fill2
+
+
+frmt = frm * 15
+
+x1 = SIN(frmt / 533) * 300 + SIN(frmt / 53) * 50
+y1 = COS(frmt / 422) * 300 + SIN(frmt / 31) * 20
+z1 = SIN(frmt / 133) * 300 + SIN(frmt / 39) * 60
+
+frmt = (frm - 1) * 15
+
+x2 = SIN(frmt / 533) * 300 + SIN(frmt / 53) * 50
+y2 = COS(frmt / 422) * 300 + SIN(frmt / 31) * 20
+z2 = SIN(frmt / 133) * 300 + SIN(frmt / 39) * 60
+
+
+
+createNewLine x1, y1, z1, x2, y2, z2, INT(RND * 15) + 1
+
+END SUB
+
+SUB fill3
+
+IF frm / 10 = frm \ 10 THEN  ELSE GOTO fill31
+
+c = RND * 15 + 1
+
+x = RND * 800 - 400
+y = RND * 800 - 400
+z = RND * 800 - 400
+
+s = RND * 10 + 3
+
+createNewLine x - s, y - s, z - s, x + s, y - s, z - s, c
+createNewLine x + s, y - s, z - s, x + s, y + s, z - s, c
+createNewLine x + s, y + s, z - s, x - s, y + s, z - s, c
+createNewLine x - s, y + s, z - s, x - s, y - s, z - s, c
+
+createNewLine x - s, y - s, z + s, x + s, y - s, z + s, c
+createNewLine x + s, y - s, z + s, x + s, y + s, z + s, c
+createNewLine x + s, y + s, z + s, x - s, y + s, z + s, c
+createNewLine x - s, y + s, z + s, x - s, y - s, z + s, c
+
+createNewLine x - s, y - s, z - s, x - s, y - s, z + s, c
+createNewLine x + s, y - s, z - s, x + s, y - s, z + s, c
+createNewLine x + s, y + s, z - s, x + s, y + s, z + s, c
+createNewLine x - s, y + s, z - s, x - s, y + s, z + s, c
+
+xo = x
+yo = y
+zo = z
+
+
+x = x + RND * 80 - 40
+y = y + RND * 80 - 40
+z = z + RND * 80 - 40
+
+s = RND * 10 + 3
+
+createNewLine x - s, y - s, z - s, x + s, y - s, z - s, c
+createNewLine x + s, y - s, z - s, x + s, y + s, z - s, c
+createNewLine x + s, y + s, z - s, x - s, y + s, z - s, c
+createNewLine x - s, y + s, z - s, x - s, y - s, z - s, c
+
+createNewLine x - s, y - s, z + s, x + s, y - s, z + s, c
+createNewLine x + s, y - s, z + s, x + s, y + s, z + s, c
+createNewLine x + s, y + s, z + s, x - s, y + s, z + s, c
+createNewLine x - s, y + s, z + s, x - s, y - s, z + s, c
+
+createNewLine x - s, y - s, z - s, x - s, y - s, z + s, c
+createNewLine x + s, y - s, z - s, x + s, y - s, z + s, c
+createNewLine x + s, y + s, z - s, x + s, y + s, z + s, c
+createNewLine x - s, y + s, z - s, x - s, y + s, z + s, c
+
+
+createNewLine x, y, z, xo, yo, zo, c
+
+fill31:
+END SUB
+
+SUB fill4
+IF RND * 100 < 2 THEN
+
+b$ = ""
+FOR a = 1 TO RND * 3 + 1
+b$ = b$ + CHR$(48 + RND * 9)
+NEXT a
+
+'b$ = "Hello, world!"
+prn b$, RND * 800 - 400, RND * 800 - 400, RND * 800 - 400
+
+END IF
+END SUB
+
+FUNCTION getbyte (addr)
+getbyte = PEEK(extADDR + addr)
+END FUNCTION
+
+FUNCTION getClustName$ (a, b, c)
+
+getClustName$ = "WORLD\X" + toStr$(a) + "\Y" + toStr$(b) + "\Z" + toStr$(c) + ".DAT"
+
+END FUNCTION
+
+FUNCTION getword (addr)
+a = PEEK(extADDR + addr)
+b = PEEK(extADDR + addr + 1)
+
+
+c$ = HEX$(a)
+IF LEN(c$) = 1 THEN c$ = "0" + c$
+IF LEN(c$) = 0 THEN c$ = "00"
+
+
+c = VAL("&H" + HEX$(b) + c$)
+
+getword = c
+END FUNCTION
+
+SUB importCluster (x, y, z)
+
+cln$ = getClustName(x, y, z)
+'[PRINT cln$
+
+OPEN cln$ FOR INPUT AS #1
+5
+IF EOF(1) <> 0 THEN GOTO 4
+ 
+INPUT #1, x1, y1, z1, x2, y2, z2, c
+insertLine x1, y1, z1, x2, y2, z2, c
+
+GOTO 5
+4
+CLOSE #1
+
+
+END SUB
+
+SUB insertLine (x1, y1, z1, x2, y2, z2, c)
+
+insertLine1:
+IF linC(curFreeLine) = -1 THEN
+  linX1(curFreeLine) = x1
+  linY1(curFreeLine) = y1
+  linZ1(curFreeLine) = z1
+
+  linX2(curFreeLine) = x2
+  linY2(curFreeLine) = y2
+  linZ2(curFreeLine) = z2
+ 
+  linC(curFreeLine) = c
+  curFreeLine = curFreeLine + 1
+  usedLines = usedLines + 1
+  IF curFreeLine > linAmo THEN curFreeLine = 0
+ELSE
+  curFreeLine = curFreeLine + 1
+  IF curFreeLine > linAmo THEN curFreeLine = 0
+  GOTO insertLine1
+END IF
+
+
+END SUB
+
+SUB loadArea (tx1, ty1, tz1, tx2, ty2, tz2)
+
+LOCATE 3, 1
+addMsg "Loading Area!"
+addMsg toStr$(tx1) + " " + toStr$(ty1) + " " + toStr$(tz1)
+addMsg toStr$(tx2) + " " + toStr$(ty2) + " " + toStr$(tz2)
+
+
+'PCOPY 0, 1
+'SLEEP
+
+x1 = tx1
+x2 = tx2
+
+y1 = ty1
+y2 = ty2
+
+z1 = tz1
+z2 = tz2
+
+IF x1 > x2 THEN SWAP x1, x2
+IF y1 > y2 THEN SWAP y1, y2
+IF z1 > z2 THEN SWAP z1, z2
+
+FOR x = x1 TO x2
+  FOR y = y1 TO y2
+    FOR z = z1 TO z2
+      loadCluster x, y, z
+    NEXT z
+  NEXT y
+NEXT x
+
+END SUB
+
+SUB loadCluster (x, y, z)
+
+IF ABS(x) > worldSize THEN GOTO 11
+IF ABS(y) > worldSize THEN GOTO 11
+IF ABS(z) > worldSize THEN GOTO 11
+
+cln$ = getClustName(x, y, z)
+
+OPEN cln$ FOR INPUT AS #1
+10
+IF EOF(1) <> 0 THEN GOTO 9
+
+INPUT #1, x1, y1, z1, x2, y2, z2, c
+insertLine x1, y1, z1, x2, y2, z2, c
+
+GOTO 10
+9
+CLOSE #1
+
+11
+
+END SUB
+
+SUB loadObject (name$, x, y, z)
+
+'SCREEN 13
+'PRINT "objects\" + name$ + ".3d"
+'END
+
+OPEN "OBJECTS\" + name$ + ".3d" FOR INPUT AS #2
+13
+IF EOF(2) <> 0 THEN GOTO 12
+INPUT #2, x1, y1, z1, x2, y2, z2, co
+createNewLine x1 + x, y1 + y, z1 + z, x2 + x, y2 + y, z2 + z, co
+GOTO 13
+12
+CLOSE #2
+
+END SUB
+
+SUB makeGrid (x1, y1, z1, x2, y2, z2)
+
+s = 100
+
+FOR x = x1 TO x2 STEP s
+  FOR y = y1 TO y2 STEP s
+    createLongLine x1, y, x, x2, y, x, 1
+    createLongLine x, y1, y, x, y2, y, 1
+    createLongLine x, y, z1, x, y, z2, 1
+  NEXT y
+NEXT x
+
+END SUB
+
+SUB mousedemo
+
+
+
+cx = 150
+cy = 100
+maxmove = 50
+100
+frm = frm + 1
+
+
+LOCATE 1, 1
+PRINT cx, cy
+PRINT frm
+
+CIRCLE (cx, cy), 10, 0
+xp = getword(2)
+putword 2, 0
+yp = getword(4)
+putword 4, 0
+
+
+IF xp < -maxmove THEN xp = -maxmove
+IF xp > maxmove THEN xp = maxmove
+cx = cx + xp
+
+IF yp < -maxmove THEN yp = -maxmove
+IF yp > maxmove THEN yp = maxmove
+cy = cy + yp
+
+
+CIRCLE (cx, cy), 10, 10
+
+
+
+SOUND 0, .05
+GOTO 100
+
+
+END SUB
+
+SUB prn (a$, x, y, z)
+
+FOR a = 1 TO LEN(a$)
+  b$ = RIGHT$(LEFT$(a$, a), 1)
+  putChar b$, x + (a - 1) * 8, y, z
+NEXT a
+END SUB
+
+SUB putbyte (addr, dat)
+
+POKE (extADDR + addr), dat
+END SUB
+
+SUB putChar (a$, x, y, z)
+
+n$ = "FONT\LTR" + toStr(ASC(a$))
+loadObject n$, x, y, z
+
+END SUB
+
+SUB putword (addr, dat)
+
+b$ = HEX$(dat)
+
+2
+IF LEN(b$) < 4 THEN b$ = "0" + b$: GOTO 2
+
+n1 = VAL("&H" + LEFT$(b$, 2))
+n2 = VAL("&H" + RIGHT$(b$, 2))
+
+
+POKE (extADDR + addr), n2
+POKE (extADDR + addr + 1), n1
+
+END SUB
+
+SUB render
+
+s1 = SIN(an1)
+c1 = COS(an1)
+
+s2 = SIN(an2)
+c2 = COS(an2)
+
+
+FOR a = 0 TO linAmo
+
+  IF linC(a) > 0 THEN
+    x11 = linX1(a) - myx
+    y11 = linY1(a) - myy
+    z11 = linZ1(a) - myz
+ 
+    x21 = linX2(a) - myx
+    y21 = linY2(a) - myy
+    z21 = linZ2(a) - myz
+
+
+    x12 = x11 * c1 + z11 * s1
+    z12 = z11 * c1 - x11 * s1
+
+
+    y12 = y11 * c2 + z12 * s2
+    z13 = z12 * c2 - y11 * s2
+
+
+    IF z13 > 3 THEN
+      x22 = x21 * c1 + z21 * s1
+      z22 = z21 * c1 - x21 * s1
+
+
+      y22 = y21 * c2 + z22 * s2
+      z23 = z22 * c2 - y21 * s2
+
+
+      IF z23 > 3 THEN
+   
+        rx1 = x12 / z13 * 130 + 160
+        ry1 = y12 / z13 * 130 + 100
+      
+        rx2 = x22 / z23 * 130 + 160
+        ry2 = y22 / z23 * 130 + 100
+     
+        LINE (rx1, ry1)-(rx2, ry2), linC(a)
+      END IF
+    END IF
+  END IF
+NEXT a
+
+
+'dispmsg
+
+END SUB
+
+SUB start
+
+RANDOMIZE TIMER
+
+FOR a = 0 TO linAmo
+  linC(a) = -1
+NEXT a
+
+
+startext
+
+maxmove = 50
+curFreeLine = 0
+worldSize = 5
+usedLines = 0
+desMaxLines = 2000
+
+visMaxX = worldSize
+visMaxY = worldSize
+visMaxZ = worldSize
+visMinX = -worldSize
+visMinY = -worldSize
+visMinZ = -worldSize
+
+visDist = worldSize
+
+createWorld
+
+SCREEN 7, , , 1
+
+
+
+END SUB
+
+SUB startext
+
+DEF SEG = 0     ' read first from interrupt table
+
+extSEG = PEEK(&H79 * 4 + 3) * 256
+extSEG = extSEG + PEEK(&H79 * 4 + 2)
+
+PRINT "Segment is: " + HEX$(extSEG)
+
+extADDR = PEEK(&H79 * 4 + 1) * 256
+extADDR = extADDR + PEEK(&H79 * 4 + 0)
+
+PRINT "relative address is:"; extADDR
+
+DEF SEG = extSEG
+
+IF getword(0) <> 1983 THEN
+  PRINT "FATAL ERROR:  you must load"
+  PRINT "QBasic extension TSR first!"
+  SYSTEM
+END IF
+
+END SUB
+
+FUNCTION toStr$ (a)
+
+b$ = STR$(a)
+IF LEFT$(b$, 1) = " " THEN b$ = RIGHT$(b$, LEN(b$) - 1)
+toStr$ = b$
+
+END FUNCTION
+
diff --git a/3D GFX/Swapping 3D engine/index.html b/3D GFX/Swapping 3D engine/index.html
new file mode 100644
index 0000000..08bf2d5
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/index.html	
@@ -0,0 +1,243 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2025-05-31 la 07:17 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Swapping 3D engine</title>
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
+  .subtitle { text-align: center;
+              font-size: medium;
+              font-weight: bold;
+              margin-top:0; }
+  .todo   { font-family: monospace; color: red; }
+  .done   { font-family: monospace; color: green; }
+  .priority { font-family: monospace; color: orange; }
+  .tag    { background-color: #eee; font-family: monospace;
+            padding: 2px; font-size: 80%; font-weight: normal; }
+  .timestamp { color: #bebebe; }
+  .timestamp-kwd { color: #5f9ea0; }
+  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
+  .org-left   { margin-left: 0px;  margin-right: auto; text-align: left; }
+  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #e6e6e6;
+    border-radius: 3px;
+    background-color: #f2f2f2;
+    padding: 8pt;
+    font-family: monospace;
+    overflow: auto;
+    margin: 1.2em;
+  }
+  pre.src {
+    position: relative;
+    overflow: auto;
+  }
+  pre.src:before {
+    display: none;
+    position: absolute;
+    top: -8px;
+    right: 12px;
+    padding: 3px;
+    color: #555;
+    background-color: #f2f2f299;
+  }
+  pre.src:hover:before { display: inline; margin-top: 14px;}
+  /* Languages per Org manual */
+  pre.src-asymptote:before { content: 'Asymptote'; }
+  pre.src-awk:before { content: 'Awk'; }
+  pre.src-authinfo::before { content: 'Authinfo'; }
+  pre.src-C:before { content: 'C'; }
+  /* pre.src-C++ doesn't work in CSS */
+  pre.src-clojure:before { content: 'Clojure'; }
+  pre.src-css:before { content: 'CSS'; }
+  pre.src-D:before { content: 'D'; }
+  pre.src-ditaa:before { content: 'ditaa'; }
+  pre.src-dot:before { content: 'Graphviz'; }
+  pre.src-calc:before { content: 'Emacs Calc'; }
+  pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
+  pre.src-fortran:before { content: 'Fortran'; }
+  pre.src-gnuplot:before { content: 'gnuplot'; }
+  pre.src-haskell:before { content: 'Haskell'; }
+  pre.src-hledger:before { content: 'hledger'; }
+  pre.src-java:before { content: 'Java'; }
+  pre.src-js:before { content: 'Javascript'; }
+  pre.src-latex:before { content: 'LaTeX'; }
+  pre.src-ledger:before { content: 'Ledger'; }
+  pre.src-lisp:before { content: 'Lisp'; }
+  pre.src-lilypond:before { content: 'Lilypond'; }
+  pre.src-lua:before { content: 'Lua'; }
+  pre.src-matlab:before { content: 'MATLAB'; }
+  pre.src-mscgen:before { content: 'Mscgen'; }
+  pre.src-ocaml:before { content: 'Objective Caml'; }
+  pre.src-octave:before { content: 'Octave'; }
+  pre.src-org:before { content: 'Org mode'; }
+  pre.src-oz:before { content: 'OZ'; }
+  pre.src-plantuml:before { content: 'Plantuml'; }
+  pre.src-processing:before { content: 'Processing.js'; }
+  pre.src-python:before { content: 'Python'; }
+  pre.src-R:before { content: 'R'; }
+  pre.src-ruby:before { content: 'Ruby'; }
+  pre.src-sass:before { content: 'Sass'; }
+  pre.src-scheme:before { content: 'Scheme'; }
+  pre.src-screen:before { content: 'Gnu Screen'; }
+  pre.src-sed:before { content: 'Sed'; }
+  pre.src-sh:before { content: 'shell'; }
+  pre.src-sql:before { content: 'SQL'; }
+  pre.src-sqlite:before { content: 'SQLite'; }
+  /* additional languages in org.el's org-babel-load-languages alist */
+  pre.src-forth:before { content: 'Forth'; }
+  pre.src-io:before { content: 'IO'; }
+  pre.src-J:before { content: 'J'; }
+  pre.src-makefile:before { content: 'Makefile'; }
+  pre.src-maxima:before { content: 'Maxima'; }
+  pre.src-perl:before { content: 'Perl'; }
+  pre.src-picolisp:before { content: 'Pico Lisp'; }
+  pre.src-scala:before { content: 'Scala'; }
+  pre.src-shell:before { content: 'Shell Script'; }
+  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
+  /* additional language identifiers per "defun org-babel-execute"
+       in ob-*.el */
+  pre.src-cpp:before  { content: 'C++'; }
+  pre.src-abc:before  { content: 'ABC'; }
+  pre.src-coq:before  { content: 'Coq'; }
+  pre.src-groovy:before  { content: 'Groovy'; }
+  /* additional language identifiers from org-babel-shell-names in
+     ob-shell.el: ob-shell is the only babel language using a lambda to put
+     the execution function name together. */
+  pre.src-bash:before  { content: 'bash'; }
+  pre.src-csh:before  { content: 'csh'; }
+  pre.src-ash:before  { content: 'ash'; }
+  pre.src-dash:before  { content: 'dash'; }
+  pre.src-ksh:before  { content: 'ksh'; }
+  pre.src-mksh:before  { content: 'mksh'; }
+  pre.src-posh:before  { content: 'posh'; }
+  /* Additional Emacs modes also supported by the LaTeX listings package */
+  pre.src-ada:before { content: 'Ada'; }
+  pre.src-asm:before { content: 'Assembler'; }
+  pre.src-caml:before { content: 'Caml'; }
+  pre.src-delphi:before { content: 'Delphi'; }
+  pre.src-html:before { content: 'HTML'; }
+  pre.src-idl:before { content: 'IDL'; }
+  pre.src-mercury:before { content: 'Mercury'; }
+  pre.src-metapost:before { content: 'MetaPost'; }
+  pre.src-modula-2:before { content: 'Modula-2'; }
+  pre.src-pascal:before { content: 'Pascal'; }
+  pre.src-ps:before { content: 'PostScript'; }
+  pre.src-prolog:before { content: 'Prolog'; }
+  pre.src-simula:before { content: 'Simula'; }
+  pre.src-tcl:before { content: 'tcl'; }
+  pre.src-tex:before { content: 'TeX'; }
+  pre.src-plain-tex:before { content: 'Plain TeX'; }
+  pre.src-verilog:before { content: 'Verilog'; }
+  pre.src-vhdl:before { content: 'VHDL'; }
+  pre.src-xml:before { content: 'XML'; }
+  pre.src-nxml:before { content: 'XML'; }
+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
+  caption.t-above { caption-side: top; }
+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
+  th.org-left   { text-align: center;   }
+  th.org-center { text-align: center; }
+  td.org-right  { text-align: right;  }
+  td.org-left   { text-align: left;   }
+  td.org-center { text-align: center; }
+  dt { font-weight: bold; }
+  .footpara { display: inline; }
+  .footdef  { margin-bottom: 1em; }
+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
+  .org-info-js_info-navigation { border-style: none; }
+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
+<style type="text/css">
+               body {
+                 max-width: 35cm !important;
+               }
+               #content {
+                 max-width: 80em !important;
+                 width: 90%;
+               }
+               </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">Swapping 3D engine</h1>
+<p>
+Idea is to implement 3D engine that can run world with unlimited
+complexity. To overcome RAM limits and keep good framerate, world is
+divided into cube shaped segments. Those segments are swapped out to
+disk when they are too far away. When you move around the world,
+segments are swapped in on-demand.
+</p>
+
+<p>
+Engine allows user to freely fly around using mouse and keyboard.
+</p>
+
+<p>
+Sexment size is 100x100x100 units. Every segment is stored in its own
+file within the filesystem.
+</p>
+
+
+<div id="org2f73a11" class="figure">
+<p><img src="screenshot.png" alt="screenshot.png" />
+</p>
+</div>
+
+
+<div id="org6cf369b" class="figure">
+<p><img src="screenshot, 2.png" alt="screenshot, 2.png" />
+</p>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2025-05-31 la 07:17</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/3D GFX/Swapping 3D engine/index.org b/3D GFX/Swapping 3D engine/index.org
new file mode 100755
index 0000000..58010e5
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/index.org	
@@ -0,0 +1,25 @@
+
+#+TITLE: Swapping 3D engine
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+
+Idea is to implement 3D engine that can run world with unlimited
+complexity. To overcome RAM limits and keep good framerate, world is
+divided into cube shaped segments. Those segments are swapped out to
+disk when they are too far away. When you move around the world,
+segments are swapped in on-demand.
+
+Engine allows user to freely fly around using mouse and keyboard.
+
+Sexment size is 100x100x100 units. Every segment is stored in its own
+file within the filesystem.
+
+[[file:screenshot.png]]
+
+[[file:screenshot, 2.png]]
diff --git a/3D GFX/Swapping 3D engine/objects/font/LTR100.3D b/3D GFX/Swapping 3D engine/objects/font/LTR100.3D
new file mode 100755
index 0000000..e801017
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/objects/font/LTR100.3D	
@@ -0,0 +1,40 @@
+ 4  1  0  4  2  0  10 
+ 7  1  0  7  2  0  10 
+ 5  2  0  5  3  0  10 
+ 7  2  0  7  3  0  10 
+ 2  3  0  2  4  0  10 
+ 7  3  0  7  4  0  10 
+ 1  4  0  1  5  0  10 
+ 3  4  0  3  5  0  10 
+ 5  4  0  5  5  0  10 
+ 7  4  0  7  5  0  10 
+ 1  5  0  1  6  0  10 
+ 3  5  0  3  6  0  10 
+ 5  5  0  5  6  0  10 
+ 7  5  0  7  6  0  10 
+ 1  6  0  1  7  0  10 
+ 3  6  0  3  7  0  10 
+ 5  6  0  5  7  0  10 
+ 7  6  0  7  7  0  10 
+ 2  7  0  2  8  0  10 
+ 8  7  0  8  8  0  10 
+ 1  4  0  2  4  0  10 
+ 1  7  0  2  7  0  10 
+ 2  3  0  3  3  0  10 
+ 2  8  0  3  8  0  10 
+ 3  3  0  4  3  0  10 
+ 3  4  0  4  4  0  10 
+ 3  7  0  4  7  0  10 
+ 3  8  0  4  8  0  10 
+ 4  1  0  5  1  0  10 
+ 4  2  0  5  2  0  10 
+ 4  3  0  5  3  0  10 
+ 4  4  0  5  4  0  10 
+ 4  7  0  5  7  0  10 
+ 4  8  0  5  8  0  10 
+ 5  1  0  6  1  0  10 
+ 5  8  0  6  8  0  10 
+ 6  1  0  7  1  0  10 
+ 6  8  0  7  8  0  10 
+ 7  7  0  8  7  0  10 
+ 7  8  0  8  8  0  10 
diff --git a/3D GFX/Swapping 3D engine/objects/font/LTR101.3D b/3D GFX/Swapping 3D engine/objects/font/LTR101.3D
new file mode 100755
index 0000000..ac4241a
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/objects/font/LTR101.3D	
@@ -0,0 +1,40 @@
+ 2  3  0  2  4  0  10 
+ 7  3  0  7  4  0  10 
+ 1  4  0  1  5  0  10 
+ 3  4  0  3  5  0  10 
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+ 4  4  0  5  4  0  10 
+ 5  3  0  6  3  0  10 
+ 5  4  0  6  4  0  10 
diff --git a/3D GFX/Swapping 3D engine/objects/font/LTR97.3D b/3D GFX/Swapping 3D engine/objects/font/LTR97.3D
new file mode 100755
index 0000000..5016e75
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/objects/font/LTR97.3D	
@@ -0,0 +1,36 @@
+ 2  3  0  2  4  0  10 
+ 6  3  0  6  4  0  10 
+ 5  4  0  5  5  0  10 
+ 7  4  0  7  5  0  10 
+ 2  5  0  2  6  0  10 
+ 7  5  0  7  6  0  10 
+ 1  6  0  1  7  0  10 
+ 3  6  0  3  7  0  10 
+ 5  6  0  5  7  0  10 
+ 7  6  0  7  7  0  10 
+ 2  7  0  2  8  0  10 
+ 8  7  0  8  8  0  10 
+ 1  6  0  2  6  0  10 
+ 1  7  0  2  7  0  10 
+ 2  3  0  3  3  0  10 
+ 2  4  0  3  4  0  10 
+ 2  5  0  3  5  0  10 
+ 2  8  0  3  8  0  10 
+ 3  3  0  4  3  0  10 
+ 3  4  0  4  4  0  10 
+ 3  5  0  4  5  0  10 
+ 3  6  0  4  6  0  10 
+ 3  7  0  4  7  0  10 
+ 3  8  0  4  8  0  10 
+ 4  3  0  5  3  0  10 
+ 4  4  0  5  4  0  10 
+ 4  5  0  5  5  0  10 
+ 4  6  0  5  6  0  10 
+ 4  7  0  5  7  0  10 
+ 4  8  0  5  8  0  10 
+ 5  3  0  6  3  0  10 
+ 5  8  0  6  8  0  10 
+ 6  4  0  7  4  0  10 
+ 6  8  0  7  8  0  10 
+ 7  7  0  8  7  0  10 
+ 7  8  0  8  8  0  10 
diff --git a/3D GFX/Swapping 3D engine/objects/font/LTR98.3D b/3D GFX/Swapping 3D engine/objects/font/LTR98.3D
new file mode 100755
index 0000000..f2324d2
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/objects/font/LTR98.3D	
@@ -0,0 +1,40 @@
+ 1  1  0  1  2  0  10 
+ 4  1  0  4  2  0  10 
+ 2  2  0  2  3  0  10 
+ 4  2  0  4  3  0  10 
+ 2  3  0  2  4  0  10 
+ 7  3  0  7  4  0  10 
+ 2  4  0  2  5  0  10 
+ 4  4  0  4  5  0  10 
+ 6  4  0  6  5  0  10 
+ 8  4  0  8  5  0  10 
+ 2  5  0  2  6  0  10 
+ 4  5  0  4  6  0  10 
+ 6  5  0  6  6  0  10 
+ 8  5  0  8  6  0  10 
+ 2  6  0  2  7  0  10 
+ 4  6  0  4  7  0  10 
+ 6  6  0  6  7  0  10 
+ 8  6  0  8  7  0  10 
+ 1  7  0  1  8  0  10 
+ 7  7  0  7  8  0  10 
+ 1  1  0  2  1  0  10 
+ 1  2  0  2  2  0  10 
+ 1  7  0  2  7  0  10 
+ 1  8  0  2  8  0  10 
+ 2  1  0  3  1  0  10 
+ 2  8  0  3  8  0  10 
+ 3  1  0  4  1  0  10 
+ 3  8  0  4  8  0  10 
+ 4  3  0  5  3  0  10 
+ 4  4  0  5  4  0  10 
+ 4  7  0  5  7  0  10 
+ 4  8  0  5  8  0  10 
+ 5  3  0  6  3  0  10 
+ 5  4  0  6  4  0  10 
+ 5  7  0  6  7  0  10 
+ 5  8  0  6  8  0  10 
+ 6  3  0  7  3  0  10 
+ 6  8  0  7  8  0  10 
+ 7  4  0  8  4  0  10 
+ 7  7  0  8  7  0  10 
diff --git a/3D GFX/Swapping 3D engine/objects/font/LTR99.3D b/3D GFX/Swapping 3D engine/objects/font/LTR99.3D
new file mode 100755
index 0000000..68cfd33
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/objects/font/LTR99.3D	
@@ -0,0 +1,38 @@
+ 2  3  0  2  4  0  10 
+ 7  3  0  7  4  0  10 
+ 1  4  0  1  5  0  10 
+ 3  4  0  3  5  0  10 
+ 6  4  0  6  5  0  10 
+ 8  4  0  8  5  0  10 
+ 1  5  0  1  6  0  10 
+ 3  5  0  3  6  0  10 
+ 1  6  0  1  7  0  10 
+ 3  6  0  3  7  0  10 
+ 6  6  0  6  7  0  10 
+ 8  6  0  8  7  0  10 
+ 2  7  0  2  8  0  10 
+ 7  7  0  7  8  0  10 
+ 1  4  0  2  4  0  10 
+ 1  7  0  2  7  0  10 
+ 2  3  0  3  3  0  10 
+ 2  8  0  3  8  0  10 
+ 3  3  0  4  3  0  10 
+ 3  4  0  4  4  0  10 
+ 3  7  0  4  7  0  10 
+ 3  8  0  4  8  0  10 
+ 4  3  0  5  3  0  10 
+ 4  4  0  5  4  0  10 
+ 4  7  0  5  7  0  10 
+ 4  8  0  5  8  0  10 
+ 5  3  0  6  3  0  10 
+ 5  4  0  6  4  0  10 
+ 5  7  0  6  7  0  10 
+ 5  8  0  6  8  0  10 
+ 6  3  0  7  3  0  10 
+ 6  5  0  7  5  0  10 
+ 6  6  0  7  6  0  10 
+ 6  8  0  7  8  0  10 
+ 7  4  0  8  4  0  10 
+ 7  5  0  8  5  0  10 
+ 7  6  0  8  6  0  10 
+ 7  7  0  8  7  0  10 
diff --git a/3D GFX/Swapping 3D engine/objects/font/mk3dfont.bas b/3D GFX/Swapping 3D engine/objects/font/mk3dfont.bas
new file mode 100755
index 0000000..fa50e58
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/objects/font/mk3dfont.bas	
@@ -0,0 +1,44 @@
+' 3D font table generator
+' made by Svjatoslav Agejenko
+' last edit 2004.01
+' H-Page: svjatoslav.eu
+' E-Mail: svjatoslav@svjatoslav.eu
+ 
+DECLARE SUB ln (x1!, y1!, x2!, y2!)
+SCREEN 13
+
+FOR a = 32 TO 255
+  LOCATE 2, 2
+  PRINT CHR$(a)
+  n$ = STR$(a)
+  IF LEFT$(n$, 1) = " " THEN n$ = RIGHT$(n$, LEN(n$) - 1)
+
+  n$ = "ltr" + n$ + ".3d"
+
+  OPEN n$ FOR OUTPUT AS #1
+  FOR y = 0 TO 15
+    FOR x = 0 TO 15
+      c1 = POINT(x, y)
+      c2 = POINT(x + 1, y)
+      IF c2 <> c1 THEN ln x + 1, y, x + 1, y + 1
+    NEXT x
+  NEXT y
+
+  FOR x = 0 TO 15
+    FOR y = 0 TO 15
+      c1 = POINT(x, y)
+      c2 = POINT(x, y + 1)
+      IF c2 <> c1 THEN ln x, y + 1, x + 1, y + 1
+    NEXT y
+  NEXT x
+
+  CLOSE #1
+NEXT a
+SCREEN 0
+PRINT "done"
+SYSTEM
+
+SUB ln (x1, y1, x2, y2)
+  PRINT #1, x1 - 7; y1 - 7; 0; x2 - 7; y2 - 7; 0; 10
+END SUB
+
diff --git a/3D GFX/Swapping 3D engine/qbext.com b/3D GFX/Swapping 3D engine/qbext.com
new file mode 100755
index 0000000..ae54fc4
Binary files /dev/null and b/3D GFX/Swapping 3D engine/qbext.com differ
diff --git a/3D GFX/Swapping 3D engine/run.bat b/3D GFX/Swapping 3D engine/run.bat
new file mode 100755
index 0000000..2558764
--- /dev/null
+++ b/3D GFX/Swapping 3D engine/run.bat	
@@ -0,0 +1,2 @@
+qbext
+qb /run engine.bas
\ No newline at end of file
diff --git a/3D GFX/Swapping 3D engine/screenshot, 2.png b/3D GFX/Swapping 3D engine/screenshot, 2.png
new file mode 100644
index 0000000..3eca5d1
Binary files /dev/null and b/3D GFX/Swapping 3D engine/screenshot, 2.png differ
diff --git a/3D GFX/Swapping 3D engine/screenshot.png b/3D GFX/Swapping 3D engine/screenshot.png
new file mode 100755
index 0000000..d482abb
Binary files /dev/null and b/3D GFX/Swapping 3D engine/screenshot.png differ
diff --git a/3D GFX/qbext.com b/3D GFX/qbext.com
new file mode 100755
index 0000000..ae54fc4
Binary files /dev/null and b/3D GFX/qbext.com differ
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..0e259d4
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
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+vii. other similar, equivalent or corresponding rights throughout the
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+
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+
+3. Public License Fallback. Should any part of the Waiver for any reason
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+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+    surrendered, licensed or otherwise affected by this document.
+ b. Affirmer offers the Work as-is and makes no representations or
+    warranties of any kind concerning the Work, express, implied,
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+    title, merchantability, fitness for a particular purpose, non
+    infringement, or the absence of latent or other defects, accuracy, or
+    the present or absence of errors, whether or not discoverable, all to
+    the greatest extent permissible under applicable law.
+ c. Affirmer disclaims responsibility for clearing rights of other persons
+    that may apply to the Work or any use thereof, including without
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+    consents, permissions or other rights required for any use of the
+    Work.
+ d. Affirmer understands and acknowledges that Creative Commons is not a
+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.
diff --git a/Games/Worm/1.lvl b/Games/Worm/1.lvl
new file mode 100644
index 0000000..6997eeb
--- /dev/null
+++ b/Games/Worm/1.lvl
@@ -0,0 +1,35 @@
+/###################################
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/###################################
diff --git a/Games/Worm/10.lvl b/Games/Worm/10.lvl
new file mode 100644
index 0000000..24198ec
--- /dev/null
+++ b/Games/Worm/10.lvl
@@ -0,0 +1,35 @@
+/######################   ##########
+/######################   ##########
+/#m                       m       ##
+/#m                       m       ##
+/#m                       m       ##
+/#m       mmmmmmmmmmmmm   m       ##
+/#m             m         m       ##
+/#m             m         m       ##
+/#m             m         m       ##
+/#mmmmmmmmmm    m         m       ##
+/#m             m         m       ##
+/#m             m         m       ##
+/#m             m         m       ##
+/#m       mmmmmmmmmmmmm   m       ##
+/#m                       m       ##
+/#m                       m       ##
+/#m                       m       ##
+/#m               m       m       m#
+/#mmmmmmmmmmmmmmmmm       m       ##
+/         m       m                 
+/         m       m                 
+/         m       m                 
+/#m       m       mmmmmmmmmmmmmmmmm#
+/#m       m       m               m#
+/#m       m       m               m#
+/#m       m       m               m#
+/                 m                 
+/                 m                 
+/                 m                 
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmm   m#
+/                             m     
+/                             m     
+/                             m     
+/#mmmmmmmmmmmmmmmmmmmmm   mmmmmmmmm#
+/######################   ##########
diff --git a/Games/Worm/11.lvl b/Games/Worm/11.lvl
new file mode 100644
index 0000000..aa94d33
--- /dev/null
+++ b/Games/Worm/11.lvl
@@ -0,0 +1,35 @@
+/###################################
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/#m                               m#
+/#m                               m#
+/#m  m       m         m       m  m#
+/#m  mm       m       m       mm  m#
+/#m  mmm       m     m       mmm  m#
+/#m  m  m       m   m       m  m  m#
+/#m  m  m        m m        m  m  m#
+/#m  m  m         m        m   m  m#
+/#m  m   m                 m   m  m#
+/#m  m    m                m   m  m#
+/#m  m    m                m   m  m#
+/#m  m    m               m    m  m#
+/#m  m     m             m     m  m#
+/#m  m      m            m     m  m#
+/#m  m      m            m     m  m#
+/#m  m      m           m      m  m#
+/#m  m       m         m       m  m#
+/#m  m        m       m        m  m#
+/#m  m         m     m         m  m#
+/#m  m          m   m          m  m#
+/#m  m    m      m m      m    m  m#
+/#m  m    mm      m      mm    m  m#
+/#m  m    mmm           mmm    m  m#
+/#m  m    m  m         m  m    m  m#
+/#m  m    m   m       m   m    m  m#
+/#m  m    m    m     m    m    m  m#
+/#m  m    m     m   m     m    m  m#
+/#m  m    m      m m      m    m  m#
+/#m  m    m       m       m    m  m#
+/#m                               m#
+/#m                               m#
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/###################################
diff --git a/Games/Worm/2.lvl b/Games/Worm/2.lvl
new file mode 100644
index 0000000..474800b
--- /dev/null
+++ b/Games/Worm/2.lvl
@@ -0,0 +1,35 @@
+/###################################
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/#m                               mm
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m               m               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/###################################
diff --git a/Games/Worm/3.lvl b/Games/Worm/3.lvl
new file mode 100644
index 0000000..bfbdba5
--- /dev/null
+++ b/Games/Worm/3.lvl
@@ -0,0 +1,35 @@
+/###########     ###     ###########
+/#mmmmmmmmmm     mmm     mmmmmmmmmm#
+/#mmmmmmmm                 mmmmmmmm#
+/#mmmmmm                     mmmmmm#
+/#mmmmm                       mmmmm#
+/#mmmm           mmm           mmmm#
+/#mmm           mmmmm           mmm#
+/mmm            mmmmm            mm#
+/#mm             mmm             mm#
+/#m               m               m#
+/#m               m               m#
+/                 m                 
+/                 m                 
+/                 m                 
+/                mmm                
+/      mm        mmm        mm      
+/#m   mmmm     mmmmmmm     mmmm   m#
+/#m   mmmmmmmmmmmmmmmmmmmmmmmmm   m#
+/#m   mmmm     mmmmmmm     mmmm   m#
+/      mm        mmm        mm      
+/                mmm                
+/                 m                 
+/                 m                 
+/                 m                 
+/#m               m               m#
+/#m               m               m#
+/#mm             mmm             mm#
+/#mm            mmmmm            mm#
+/#mmm           mmmmm           mmm#
+/#mmmm           mmm           mmmm#
+/#mmmmm                       mmmmm#
+/#mmmmmm                     mmmmmm#
+/#mmmmmmmm                 mmmmmmmm#
+/#mmmmmmmmmm     mmm     mmmmmmmmmm#
+/###########     ###     ###########
diff --git a/Games/Worm/4.lvl b/Games/Worm/4.lvl
new file mode 100644
index 0000000..7b64d2b
--- /dev/null
+++ b/Games/Worm/4.lvl
@@ -0,0 +1,35 @@
+/                                   
+/                                   
+/                                   
+/                                   
+/                                   
+/              mm mm                
+/             m     m               
+/                                   
+/             m     m               
+/              mm mm                
+/                                   
+/                                   
+/                                   
+/                                   
+/                                   
+/       mmmmmmmmmmmmmmmmm           
+/       m                           
+/       m                           
+/       m                m          
+/       m                m          
+/       m                m          
+/       mmmmmmmmmmmmmm              
+/                    m   m          
+/                    m   m          
+/                    m   m          
+/                    m              
+/                    m   m          
+/        mmmmmmmmmmmmm   m          
+/                        m          
+/                                   
+/                        m          
+/                        m          
+/                        m          
+/                                   
+/                                   
diff --git a/Games/Worm/5.lvl b/Games/Worm/5.lvl
new file mode 100644
index 0000000..73d9bdb
--- /dev/null
+++ b/Games/Worm/5.lvl
@@ -0,0 +1,35 @@
+/################   ################
+/#mmmmmmmmmmmmmmm   mmmmmmmmmmmmmmm#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m   #####     #####     ######  m#
+/#m   #                        #  m#
+/#m   #                        #  m#
+/#m   #                        #  m#
+/#m   #                        #  m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m   #         #####          #  m#
+/     #         #####          #    
+/     #         #####          #    
+/     #         #####          #    
+/#m   #         #####          #  mm
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m   #                        #  m#
+/#m   #                        #  m#
+/#m   #                        #  m#
+/#m   #                        #  m#
+/#m   #####     #####      #####  m#
+/#m                               mm
+/#m                               m#
+/#m                               m#
+/#mmmmmmmmmmmmmmm   mmmmmmmmmmmmmmm#
+/################   ################
diff --git a/Games/Worm/6.lvl b/Games/Worm/6.lvl
new file mode 100644
index 0000000..5bd15b8
--- /dev/null
+++ b/Games/Worm/6.lvl
@@ -0,0 +1,35 @@
+/######  ###################  ######
+/#mmmmm  mmmmmmmmmmmmmmmmmmm  #mmmm#
+/#m                           #   m#
+/#m                           #   m#
+/#m                           #   m#
+/#m   #########################   m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/######                           mm
+/     #                       #     
+/     #                       #     
+/#m   #                       #   m#
+/#m   #                       #   m#
+/#m   #           #           #   m#
+/#m   #           #           #   m#
+/#m   #           #           #   m#
+/#m   #        #######        #   m#
+/#m   #           #           #   m#
+/#m   #           m           #   m#
+/#m   #           m           #   m#
+/#m   #                       #   m#
+/#m   #                       #   m#
+/     #                       #     
+/     #                       #     
+/mm                           ######
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m   #########################   m#
+/#m   #                           m#
+/#m   #                           m#
+/#m   #                           m#
+/mmmmm#  mmmmmmmmmmmmmmmmmmm  mmmmm#
+/######  ###################  ######
diff --git a/Games/Worm/7.lvl b/Games/Worm/7.lvl
new file mode 100644
index 0000000..2980fb8
--- /dev/null
+++ b/Games/Worm/7.lvl
@@ -0,0 +1,35 @@
+/   #############################   
+/   mmmmmmmmmmmmmmmmmmmmmmmmmmmmm   
+/                 m                 
+/#m               m               m#
+/#m               m               m#
+/#m   #########################   m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m   #                           m#
+/#m   #                       #   m#
+/#m   #                       #   m#
+/#m   #      mmmmm mmmmm      #   m#
+/#m   #      m         m      #   m#
+/#m   #      m         m      #   m#
+/#m   #      m         m      #   m#
+/#m   #      m         m      #   m#
+/#mmmm#           m           #mmmm#
+/#m   #      m         m      #   m#
+/#m   #      m         m      #   m#
+/#m   #      m         m      #   m#
+/#m   #      m         m      #   m#
+/#m   #      mmmmm mmmmm      #   m#
+/#m   #                       #   m#
+/#m   #                       #   m#
+/#m   #                       #   m#
+/#m                               m#
+/#m                               m#
+/#m                               m#
+/#m   #########################   m#
+/#m               m               m#
+/#m               m               m#
+/                 m                 
+/   mmmmmmmmmmmmmmmmmmmmmmmmmmmmm   
+/   #############################   
diff --git a/Games/Worm/8.lvl b/Games/Worm/8.lvl
new file mode 100644
index 0000000..d4bdc60
--- /dev/null
+++ b/Games/Worm/8.lvl
@@ -0,0 +1,35 @@
+/###################################
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/#m                               m#
+/#m  mmmmm                 mmmmm  m#
+/#m mm                         mm m#
+/#m m                           m m#
+/#m m                           m m#
+/#m m                           m m#
+/#m m                           m m#
+/                                   
+/                                   
+/#m                               m#
+/#m                               m#
+/#m        m      mmmm   m        m#
+/#m        m  m   m      m        m#
+/#m        m  m   m      m        m#
+/#m        m  m   m      m        m#
+/#m        m  mmmmmmmmm  m        m#
+/#m        m      m   m  m        m#
+/#m        m      m   m  m        m#
+/#m        m      m   m  m        m#
+/#m        m   mmmm      m        m#
+/#m                               m#
+/#m                               m#
+/                                   
+/                                   
+/#m m                           m m#
+/#m m                           m m#
+/#m m                           m m#
+/#m m                           m m#
+/#m mm                         mm m#
+/#m  mmmmm                 mmmmm  m#
+/#m                               m#
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/###################################
diff --git a/Games/Worm/9.lvl b/Games/Worm/9.lvl
new file mode 100644
index 0000000..8ebef51
--- /dev/null
+++ b/Games/Worm/9.lvl
@@ -0,0 +1,35 @@
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/                                   
+/                                   
+/                               m   
+/                              mmm  
+/                             mmmmm 
+/                               m   
+/                               m   
+/                      mmmmmmmmmm   
+/                                   
+/                                   
+/                                   
+/                                   
+/                                   
+/                                   
+/ mmmmm    mmmmm    mmmmm    mmmmm  
+/ mmmmm    mmmmm    mmmmm    mmmmm  
+/                                   
+/                                   
+/                                   
+/                                   
+/                                    
+/                                    
+/                                     
+/                                     
+/                                    
+/                                     
+/                                    
+/                                   
+/                                    
+/                                   
+/                                   
+/#mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm#
+/###################################
diff --git a/Games/Worm/screencast.webm b/Games/Worm/screencast.webm
new file mode 100644
index 0000000..9fa029c
Binary files /dev/null and b/Games/Worm/screencast.webm differ
diff --git a/Games/Worm/worm.bas b/Games/Worm/worm.bas
new file mode 100755
index 0000000..b040633
--- /dev/null
+++ b/Games/Worm/worm.bas
@@ -0,0 +1,879 @@
+' Game of worms.
+'
+' Game supports up to 5 players. Any amount of those players can be AI controlled.
+'
+' Goal for each player is to eat as many fruits as possible while avoiding collisions
+' with walls and other worms.
+'
+' Game has multiple levels. After worms have eaten certain amount of fruits, game
+' advances to the next level.
+'
+' Each worm has limited amount of lives. When worm runs into the wall or
+' another worm, it loses one life.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2024-2005, Improved program readability
+
+DECLARE FUNCTION cnum$ (a%)
+DECLARE SUB putworm (a%)
+DECLARE SUB level (a%)
+DECLARE SUB showb ()
+DECLARE SUB sc2 (x%, y%)
+DECLARE SUB ai (a%)
+DECLARE SUB autop (a%)
+DECLARE SUB prc (a%)
+DECLARE SUB dead (a%)
+DECLARE SUB add (a%)
+DECLARE SUB tkt ()
+DECLARE SUB subt (b%)
+DECLARE SUB show ()
+DECLARE SUB sc (x%, y%)
+DEFINT A-Z
+
+' Shared arrays for the game grid and worms
+DIM SHARED buf(0 TO 36, 0 TO 36)
+DIM SHARED buf2(0 TO 36, 0 TO 36)
+DIM SHARED ussx(1 TO 2000, 1 TO 5)
+DIM SHARED ussy(1 TO 2000, 1 TO 5)
+DIM SHARED ussp(1 TO 5)
+DIM SHARED ussl(1 TO 5)
+DIM SHARED usss(1 TO 5)
+DIM SHARED ussk(1 TO 2000, 1 TO 5)
+DIM SHARED usskp(1 TO 5)
+
+' Variables for worm positions and game state
+DIM SHARED ux(1 TO 5), uy(1 TO 5), uxp(1 TO 5), uyp(1 TO 5)
+DIM SHARED mtm
+DIM SHARED playerCount
+DIM SHARED lives(1 TO 5)
+DIM SHARED isAI(1 TO 5)
+DIM SHARED ail
+DIM SHARED lvl
+DIM SHARED elum
+DIM SHARED spd
+
+playerCount = 1
+ail = 10
+lvl = 1
+
+' Array defines if player is human (0) or computer (1).
+isAI(1) = 0
+isAI(2) = 0
+isAI(3) = 0
+isAI(4) = 0
+isAI(5) = 0
+
+CLS
+
+INPUT "How many players (1 - 5):", playerCount
+INPUT "How many of them are computers:", a
+FOR b = playerCount TO playerCount - a + 1 STEP -1
+    isAI(b) = 1
+NEXT b
+
+INPUT "How many lives:", elum
+INPUT "Speed: (1-slow, 3-ok, 10-very fast)", spd
+
+start
+
+level lvl
+1
+tkt
+delay .5 / spd
+' spd
+IF mtm >= 15 THEN
+    mtm = 1
+    lvl = lvl + 1
+    level lvl
+END IF
+GOTO 1
+
+SUB ai (a%)
+    ' This subroutine handles the AI logic for computer-controlled worms.
+    FOR y = 0 TO 36
+        FOR x = 0 TO 36
+            buf2(x, y) = 32000
+            IF buf(x, y) = 2 THEN buf2(x, y) = 0
+            IF buf(x, y) > 9 OR buf(x, y) = 1 THEN buf2(x, y) = -1
+        NEXT x
+    NEXT y
+
+    ' Set the target position to the center of the grid.
+    IF buf2(16, 16) = 32000 THEN buf2(16, 16) = 15000
+
+6
+    b = 0
+    FOR y = 1 TO 35
+        FOR x = 1 TO 34
+            IF (buf2(x + 1, y) > buf2(x, y) + 1) AND (buf2(x, y) >= 0) THEN
+                buf2(x + 1, y) = buf2(x, y) + 1
+                b = 1
+            END IF
+        NEXT x
+
+        ' Check if moving left is the shortest path.
+        FOR x = 35 TO 2 STEP -1
+            IF (buf2(x - 1, y) > buf2(x, y) + 1) AND (buf2(x, y) >= 0) THEN
+                buf2(x - 1, y) = buf2(x, y) + 1
+                b = 1
+            END IF
+        NEXT x
+
+        IF (buf2(1, y) > buf2(35, y) + 1) AND (buf2(35, y) >= 0) THEN
+            buf2(1, y) = buf2(35, y) + 1
+            b = 1
+        END IF
+
+        IF (buf2(35, y) > buf2(1, y) + 1) AND (buf2(1, y) >= 0) THEN
+            buf2(35, y) = buf2(1, y) + 1
+            b = 1
+        END IF
+    NEXT y
+
+    FOR x = 1 TO 35
+        FOR y = 1 TO 34
+            IF (buf2(x, y + 1) > buf2(x, y) + 1) AND (buf2(x, y) >= 0) THEN
+                buf2(x, y + 1) = buf2(x, y) + 1
+                b = 1
+            END IF
+        NEXT y
+
+        ' Check if moving up is the shortest path.
+        FOR y = 35 TO 2 STEP -1
+            IF (buf2(x, y - 1) > buf2(x, y) + 1) AND (buf2(x, y) >= 0) THEN
+                buf2(x, y - 1) = buf2(x, y) + 1
+                b = 1
+            END IF
+        NEXT y
+
+        IF (buf2(x, 1) > buf2(x, 35) + 1) AND (buf2(x, 35) >= 0) THEN
+            buf2(x, 1) = buf2(x, 35) + 1
+            b = 1
+        END IF
+
+        IF (buf2(x, 35) > buf2(x, 1) + 1) AND (buf2(x, 1) >= 0) THEN
+            buf2(x, 35) = buf2(x, 1) + 1
+            b = 1
+        END IF
+    NEXT x
+
+    ' If no shorter path is found, exit the loop.
+    IF b = 1 THEN GOTO 6
+
+    tx = ux(a)
+    ty = uy(a)
+
+    d = 0
+7
+    b = 32001
+    tmpxp = 0
+    tmpyp = 0
+
+    ' Check if moving right is the shortest path.
+    IF (buf2(tx - 1, ty) < b) AND (buf2(tx - 1, ty) >= 0) THEN
+        b = buf2(tx - 1, ty)
+        tmpxp = -1
+        tmpyp = 0
+        c = 1
+    END IF
+
+    ' Check if moving down is the shortest path.
+    IF (buf2(tx, ty - 1) < b) AND (buf2(tx, ty - 1) >= 0) THEN
+        b = buf2(tx, ty - 1)
+        tmpxp = 0
+        tmpyp = -1
+        c = 2
+    END IF
+
+    ' Check if moving left is the shortest path.
+    IF (buf2(tx + 1, ty) < b) AND (buf2(tx + 1, ty) >= 0) THEN
+        b = buf2(tx + 1, ty)
+        tmpxp = 1
+        tmpyp = 0
+        c = 3
+    END IF
+
+    ' Check if moving up is the shortest path.
+    IF (buf2(tx, ty + 1) < b) AND (buf2(tx, ty + 1) >= 0) THEN
+        b = buf2(tx, ty + 1)
+        tmpxp = 0
+        tmpyp = 1
+        c = 4
+    END IF
+
+    ' If no shorter path is found, set the direction to random.
+    IF b = 32001 THEN
+        tmpxp = -1
+        tmpyp = 0
+        c = 1
+        b = -1
+    END IF
+
+    buf2(tx, ty) = -1
+    d = d + 1
+    ussk(d, a) = c
+    tx = tx + tmpxp
+    ty = ty + tmpyp
+
+    ' Wrap around the edges of the grid.
+    IF tx = 1 THEN tx = 34
+    IF ty = 1 THEN ty = 34
+    IF tx = 35 THEN tx = 2
+    IF ty = 35 THEN ty = 2
+
+    e = buf2(tx, ty)
+    buf2(tx, ty) = -1
+
+    sc2 tx, ty
+
+    ' If the worm hits a wall or another worm, stop moving.
+    IF d > ail THEN GOTO 8
+
+    ' If the worm finds food, continue moving.
+    IF (e > 0) AND (b > -1) THEN GOTO 7
+
+8
+    d = d + 1
+    ussk(d, a) = 5
+    usskp(a) = 1
+
+    showb
+END SUB
+
+SUB autop (a%)
+    ' This subroutine handles the movement of computer-controlled worms.
+    c = 0
+
+5
+    ' If the worm is not at the end of its path, continue moving.
+    IF usskp(a) > 0 THEN
+        b = ussk(usskp(a), a)
+
+        IF b = 1 THEN
+            uxp(a) = -1
+            uyp(a) = 0
+        ELSEIF b = 2 THEN
+            uxp(a) = 0
+            uyp(a) = -1
+        ELSEIF b = 3 THEN
+            uxp(a) = 1
+            uyp(a) = 0
+        ELSEIF b = 4 THEN
+            uxp(a) = 0
+            uyp(a) = 1
+        ELSEIF b = 5 THEN
+            ai a
+            GOTO 5
+        END IF
+
+        usskp(a) = usskp(a) + 1
+    END IF
+
+    ' Calculate the new position of the worm.
+    nx = ux(a) + uxp(a)
+    ny = uy(a) + uyp(a)
+
+    ' Check if the worm hits a wall or another worm.
+    b = buf(INT(nx), INT(ny))
+
+    ' If the worm hits a wall or another worm, recalculate the AI.
+    IF (b = 1 OR b > 9) AND (c = 0) THEN
+        ai a
+        c = 1
+        GOTO 5
+    END IF
+END SUB
+
+SUB clearTail (playerNumber)
+    ' This subroutine takes care of clearing out worm tail.
+    ' As worm head advances forward in each frame, this procedure
+    ' is responsible for clearing out squares where worm tail moved out
+    ' of. Such squares are marked as empty (no longer occupied by worm)
+    ' and also correspondingly are erased from the screen.
+    a = ussp(playerNumber) - ussl(playerNumber)
+
+    IF a < 1 THEN
+        a = a + 2000
+    END IF
+
+    IF ussx(a, playerNumber) > 0 THEN
+        buf(ussx(a, playerNumber), ussy(a, playerNumber)) = 0
+
+        drawGridCell ussx(a, playerNumber), ussy(a, playerNumber)
+
+        ussx(a, playerNumber) = 0
+    END IF
+END SUB
+
+FUNCTION cnum$ (a%)
+    ' This function converts an integer to a string.
+    b$ = STR$(a%)
+
+    ' Remove leading spaces from the string.
+    IF LEFT$(b$, 1) = " " THEN
+        b$ = RIGHT$(b$, LEN(b$) - 1)
+    END IF
+
+    cnum$ = b$
+END FUNCTION
+
+SUB dead (a%)
+    ' This subroutine handles the death of a worm.
+    lives(a) = lives(a) - 1
+    putworm a
+END SUB
+
+SUB delay (delayInSeconds AS SINGLE)
+    ' Since QBasic does not have precise timer suitable for delaying animations,
+    ' workaround here is to use SOUND function. Inaudible sound with frequency
+    ' of 0 Hz is produced. Second argument for SOUND function is sound duration
+    ' that is approximately 1/18'th of the second.
+    SOUND 0, delayInSeconds * 18
+END SUB
+
+SUB drawGridCell (x%, y%)
+' This subroutine updates one cell on the screen as denoted by its
+' X and Y coordinates.
+'
+' Cell content is red from global 'buf' array and corresponding
+' sprite is drawn on the screen.
+'
+' This procedure is handy because it allows redrawing only parts of the
+' screen that were changed and thereby we avoid redrawing entire screen
+' for every frame.
+
+    x1 = x% * 5
+
+    y1 = y% * 5
+
+    LINE (x1, y1)-(x1 + 3, y1 + 3), 0, BF
+
+    SELECT CASE buf(x%, y%)
+        CASE 0
+            ' Draw an empty space on the grid.
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 1, BF
+
+        CASE 1
+            ' Draw a wall on the grid.
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 7, BF
+
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 8, B
+
+        CASE 2
+            ' Draw food on the grid.
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 14, BF
+
+        CASE 10
+            ' Draw the head of a worm.
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 10, BF
+
+            PSET (x1, y1), 0
+
+            PSET (x1 + 3, y1), 0
+
+            PSET (x1, y1 + 3), 0
+
+            PSET (x1 + 3, y1 + 3), 0
+
+        CASE 11
+            ' Draw the body of a worm.
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 12, BF
+
+            PSET (x1, y1), 0
+
+            PSET (x1 + 3, y1), 0
+
+            PSET (x1, y1 + 3), 0
+
+            PSET (x1 + 3, y1 + 3), 0
+
+        CASE 12
+            ' Draw the body of a worm.
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 13, BF
+
+            PSET (x1, y1), 0
+
+            PSET (x1 + 3, y1), 0
+
+            PSET (x1, y1 + 3), 0
+
+            PSET (x1 + 3, y1 + 3), 0
+
+        CASE 13
+            ' Draw the body of a worm.
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 15, BF
+
+            PSET (x1, y1), 0
+
+            PSET (x1 + 3, y1), 0
+
+            PSET (x1, y1 + 3), 0
+
+            PSET (x1 + 3, y1 + 3), 0
+
+        CASE 14
+            ' Draw the body of a worm.
+            LINE (x1, y1)-(x1 + 3, y1 + 3), 9, BF
+
+            PSET (x1, y1), 0
+
+            PSET (x1 + 3, y1), 0
+
+            PSET (x1, y1 + 3), 0
+
+            PSET (x1 + 3, y1 + 3), 0
+    END SELECT
+END SUB
+
+SUB init
+    ' Initialize the game by setting up the first level.
+    level 1
+END SUB
+
+SUB level (a%)
+    ' This subroutine sets up a new level of the game.
+    LOCATE 5, 5
+    PRINT "G E T   R E A D Y"
+
+    LOCATE 7, 5
+    PRINT "L E V E L :"; a%
+
+    ' Display a countdown before starting the level.
+    delay 2
+
+    CLS
+
+    ' Clear the game grid.
+    FOR y = 0 TO 36
+        FOR x = 0 TO 36
+            buf(x, y) = 0
+        NEXT x
+    NEXT y
+
+    ' Set up the walls of the grid.
+    FOR x = 0 TO 36
+        buf(x, 0) = 1
+        buf(x, 36) = 1
+        buf(0, x) = 1
+        buf(36, x) = 1
+    NEXT x
+
+    ' Load the level from a file.
+    b$ = cnum(a%) + ".lvl"
+
+    OPEN b$ FOR INPUT AS #1
+
+10
+    ' Read the level data line by line.
+    IF EOF(1) <> 0 THEN GOTO 11
+
+    LINE INPUT #1, c$
+
+    ' If the line starts with a slash, it contains grid data.
+    IF LEFT$(c$, 1) = "/" THEN
+        d = d + 1
+
+        IF d > 35 THEN
+            GOTO 12
+        END IF
+
+        g = LEN(c$)
+        IF g > 36 THEN
+            g = 36
+        END IF
+
+        ' Parse the grid data and set up the game grid.
+        FOR e = 2 TO g
+            f$ = RIGHT$(LEFT$(c$, e), 1)
+
+            IF f$ = "#" OR f$ = "m" THEN
+                buf(e - 1, d) = 1
+            ELSE
+                buf(e - 1, d) = 0
+            END IF
+        NEXT e
+    END IF
+
+12
+    GOTO 10
+
+11
+    CLOSE #1
+
+    ' Place food randomly on the grid.
+    stuff
+
+    ' Initialize the worms for each player.
+    show
+
+    FOR b = 1 TO playerCount
+        ussl(b) = 0
+        putworm b
+    NEXT b
+
+    stat
+END SUB
+
+SUB prc (playerNumber)
+' This subroutine handles the main game loop for each player.
+   
+    clearTail playerNumber
+
+    ussp(playerNumber) = ussp(playerNumber) + 1
+
+    ' If the current player has no lives left, no further processing is needed
+    IF lives(playerNumber) = 0 THEN
+        GOTO 4
+    END IF
+
+    ' If the worm is controlled by AI, recalculate its path.
+    IF isAI(playerNumber) = 1 THEN
+        autop playerNumber
+    END IF
+
+    ' Move the worm based on user input or AI direction.
+    ux(playerNumber) = ux(playerNumber) + uxp(playerNumber)
+    uy(playerNumber) = uy(playerNumber) + uyp(playerNumber)
+
+    ' Wrap around the edges of the grid.
+    IF ux(playerNumber) = 35 THEN
+        ux(playerNumber) = 2
+    END IF
+
+    IF uy(playerNumber) = 35 THEN
+        uy(playerNumber) = 2
+    END IF
+
+    IF ux(playerNumber) = 1 THEN
+        ux(playerNumber) = 34
+    END IF
+
+    IF uy(playerNumber) = 1 THEN
+        uy(playerNumber) = 34
+    END IF
+
+    x = ux(playerNumber)
+    y = uy(playerNumber)
+
+3
+    IF buf(x, y) = 2 THEN
+        buf(x, y) = 0
+
+        drawGridCell x, y
+
+        stuff
+
+        ussl(playerNumber) = ussl(playerNumber) + mtm
+
+        usss(playerNumber) = usss(playerNumber) + mtm
+
+        FOR b = 1 TO playerCount
+            IF (lives(b) > 0) AND (isAI(b) = 1) THEN
+                ai b
+            END IF
+        NEXT b
+
+        stat
+
+        GOTO 3
+    END IF
+
+    IF buf(x, y) > 0 THEN
+        dead playerNumber
+
+        GOTO 4
+    END IF
+
+    IF playerNumber = 1 THEN
+        buf(x, y) = 10
+    ELSEIF playerNumber = 2 THEN
+        buf(x, y) = 11
+    ELSEIF playerNumber = 3 THEN
+        buf(x, y) = 12
+    ELSEIF playerNumber = 4 THEN
+        buf(x, y) = 13
+    ELSEIF playerNumber = 5 THEN
+        buf(x, y) = 14
+    END IF
+
+    drawGridCell x, y
+
+    IF ussp(playerNumber) > 2000 THEN
+        ussp(playerNumber) = ussp(playerNumber) - 2000
+    END IF
+
+    ussx(ussp(playerNumber), playerNumber) = x
+
+    ussy(ussp(playerNumber), playerNumber) = y
+
+4
+END SUB
+
+SUB putworm (a%)
+    ' This subroutine initializes a new worm for a player.
+    b = ussl(a%)
+
+    ' Move the worm back to its starting position.
+    FOR c = b TO 1 STEP -1
+        ussl(a%) = c
+
+        clearTail a%
+    NEXT c
+
+9
+    uy(a%) = INT(RND * 30 + 2)
+
+    ux(a%) = INT(RND * 10 + 5)
+
+    ' Ensure that the worm starts in an empty space.
+    FOR b = ux(a%) TO ux(a%) + 10
+        IF buf(b, uy(a%)) <> 0 THEN
+            GOTO 9
+        END IF
+    NEXT b
+
+    ' Set the initial direction of the worm.
+    uxp(a%) = 1
+
+    uyp(a%) = 0
+
+    ussl(a%) = 3
+
+    stat
+END SUB
+
+SUB sc2 (x%, y%)
+    ' This subroutine draws a worm on the game grid for AI pathfinding.
+    ' LOCATE 1, 1
+    ' PRINT x%, y%
+
+    ' x1 = x% * 5 + 2
+
+    ' y1 = y% * 5 + 2
+
+    ' PSET (x1, y1), 15
+
+    ' a$ = INPUT$(1)
+END SUB
+
+SUB show
+    ' This subroutine draws the entire game grid.
+    FOR y = 1 TO 35
+        FOR x = 1 TO 35
+            drawGridCell x, y
+        NEXT x
+    NEXT y
+END SUB
+
+SUB showb
+GOTO 15
+FOR x = 1 TO 35
+FOR y = 1 TO 35
+
+LINE (x * 2 + 200, y * 2 + 100)-(x * 2 + 201, y * 2 + 101), buf2(x, y) MOD 255, BF
+NEXT y
+NEXT x
+15
+'a$ = INPUT$(1)
+END SUB
+
+SUB start
+    ' Initialize the game screen and settings.
+    SCREEN 13
+
+    RANDOMIZE TIMER
+
+    uy(1) = 5
+
+    uy(2) = 10
+
+    uy(3) = 15
+
+    uy(4) = 20
+
+    uy(5) = 25
+
+    FOR a = 1 TO playerCount
+        ux(a) = 15
+
+        uxp(a) = 1
+
+        uyp(a) = 0
+
+        ussp(a) = 0
+
+        ussl(a) = 3
+
+        lives(a) = elum
+
+        usss(a) = 0
+
+        usskp(a) = 1
+
+        ussk(1, a) = 5
+    NEXT a
+
+    mtm = 0
+END SUB
+
+SUB stat
+    ' This subroutine displays the current game statistics.
+    LOCATE 1, 25
+
+    PRINT mtm
+
+    FOR a = 1 TO 5
+        COLOR 15
+
+        LOCATE 2 + a, 24
+
+        PRINT RIGHT$(STR$(a), 1)
+
+        COLOR 10
+
+        LOCATE 2 + a, 26
+
+        IF isAI(a) = 1 THEN
+            PRINT "*"
+        ELSE
+            PRINT "-"
+        END IF
+
+        COLOR 12
+
+        LOCATE 2 + a, 27
+
+        b$ = STR$(usss(a))
+
+        PRINT RIGHT$(b$, LEN(b$) - 1)
+
+        COLOR 13
+
+        LOCATE 2 + a, 30
+
+        b$ = STR$(lives(a))
+
+        PRINT RIGHT$(b$, LEN(b$) - 1)
+    NEXT a
+
+    COLOR 10
+
+    LOCATE 8, 26
+
+    PRINT "AI"
+
+    COLOR 12
+
+    LOCATE 2, 27
+
+    PRINT "Score"
+
+    COLOR 13
+
+    LOCATE 8, 30
+
+    PRINT "Lives"
+
+    LOCATE 1, 30
+
+    PRINT "Level:"; lvl
+END SUB
+
+SUB stuff
+    ' This subroutine places food randomly on the game grid.
+2
+    x = INT(RND * 33 + 2)
+
+    y = INT(RND * 33 + 2)
+
+    IF buf(x, y) = 0 THEN
+        buf(x, y) = 2
+
+        drawGridCell x, y
+    ELSE
+        GOTO 2
+    END IF
+
+    mtm = mtm + 1
+
+    stat
+END SUB
+
+SUB tkt
+    ' This subroutine handles user input and AI recalculation.
+    a$ = INKEY$
+
+    IF a$ = CHR$(27) THEN
+        SYSTEM
+    END IF
+
+    IF (a$ = CHR$(0) + "M") AND (uxp(1) <> -1) THEN
+        uxp(1) = 1
+
+        uyp(1) = 0
+    END IF
+
+    IF (a$ = CHR$(0) + "K") AND (uxp(1) <> 1) THEN
+        uxp(1) = -1
+
+        uyp(1) = 0
+    END IF
+
+    IF (a$ = CHR$(0) + "P") AND (uyp(1) <> -1) THEN
+        uxp(1) = 0
+
+        uyp(1) = 1
+    END IF
+
+    IF (a$ = CHR$(0) + "H") AND (uyp(1) <> 1) THEN
+        uxp(1) = 0
+
+        uyp(1) = -1
+    END IF
+
+    IF (a$ = "d") AND (uxp(2) <> -1) THEN
+        uxp(2) = 1
+
+        uyp(2) = 0
+    END IF
+
+    IF (a$ = "a") AND (uxp(2) <> 1) THEN
+        uxp(2) = -1
+
+        uyp(2) = 0
+    END IF
+
+    IF (a$ = "s") AND (uyp(2) <> -1) THEN
+        uxp(2) = 0
+
+        uyp(2) = 1
+    END IF
+
+    IF (a$ = "w") AND (uyp(2) <> 1) THEN
+        uxp(2) = 0
+
+        uyp(2) = -1
+    END IF
+
+    b = VAL(a$)
+
+    IF b > 0 THEN
+        IF isAI(b) = 1 THEN
+            isAI(b) = 0
+        ELSE
+            isAI(b) = 1
+        END IF
+
+        stat
+    END IF
+
+    FOR a = 1 TO playerCount
+        prc a
+    NEXT a
+END SUB
diff --git a/Games/checkers.bas b/Games/checkers.bas
new file mode 100755
index 0000000..ce99d90
--- /dev/null
+++ b/Games/checkers.bas
@@ -0,0 +1,534 @@
+' Game of checkers.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 1998, Initial version
+' 2025, Improved program readability
+'
+' Usage:
+'   keys: w a z s - move around
+'   ENTER key - pick piece on the desk and place it to new location
+
+DECLARE SUB CheckPossibleMoves()
+DECLARE SUB HandleMovement()
+DECLARE SUB GameLoop()
+DECLARE SUB HandleInput()
+DECLARE SUB UpdateDisplay()
+DEFINT A-Z
+
+DIM SHARED boardState(-100 TO 300) AS INTEGER
+' 0 - black piece
+' 1 - white piece
+' 3 - Empty square that piece is allowed to move to
+' 4 - Empty square that is not reachable according to the game rules
+'
+' Cell address calculation (row 1--10, col 1--10):
+' cell address = ((row - 1) * 20) + col
+
+
+DIM SHARED moveMade AS INTEGER
+DIM SHARED hasMove AS INTEGER
+DIM SHARED cursorImage(1000)
+DIM SHARED cursorX, cursorY
+SCREEN 2
+
+
+CLS
+' Draw cursor image and store it into array for quick drawing on the screen
+LINE (1, 1)-(10, 1)
+LINE (1, 1)-(1, 5)
+LINE (10, 1)-(6, 2)
+LINE (6, 2)-(10, 4)
+LINE (10, 4)-(8, 5)
+LINE (8, 5)-(4, 3)
+LINE (4, 3)-(1, 5)
+PAINT (2, 2), 1
+GET (1, 1)-(10, 5), cursorImage
+
+CLS
+' Draw the checkerboard grid
+FOR col = 0 TO 10
+    LINE ((col * 40) + 20, 10)-((col * 40) + 20, 189), 1
+NEXT col
+
+FOR row = 0 TO 20
+    LINE (20, (row * 18) + 9)-(420, (row * 18) + 9), 1
+NEXT row
+
+' Initialize the board state to empty squares
+FOR cell = 1 TO 200
+    boardState(cell) = 4
+NEXT cell
+
+' Draw the initial checkerboard pattern.
+' (alternating squares to create the checkerboard)
+
+FOR row = 2 TO 10 STEP 2
+    FOR col = 1 TO 10 STEP 2
+        PAINT ((col * 40) + 5, (row * 18) + 5)
+    NEXT col
+NEXT row
+
+FOR row = 1 TO 10 STEP 2
+    FOR col = 2 TO 10 STEP 2
+        PAINT ((col * 40) + 5, (row * 18) + 5)
+    NEXT col
+NEXT row
+
+' Place the white pieces on the board
+FOR row = 2 TO 4 STEP 2
+    FOR col = 1 TO 10 STEP 2
+        boardState(((row - 1) * 20) + col) = 1
+    NEXT col
+NEXT row
+
+FOR row = 1 TO 4 STEP 2
+    FOR col = 2 TO 10 STEP 2
+        boardState(((row - 1) * 20) + col) = 1
+    NEXT col
+NEXT row
+
+' Place the black pieces on the board
+FOR row = 8 TO 10 STEP 2
+    FOR col = 1 TO 10 STEP 2
+        boardState(((row - 1) * 20) + col) = 0
+    NEXT col
+NEXT row
+
+FOR row = 7 TO 10 STEP 2
+    FOR col = 2 TO 10 STEP 2
+        boardState(((row - 1) * 20) + col) = 0
+    NEXT col
+NEXT row
+
+FOR col = 2 TO 10 STEP 2
+    boardState(80 + col) = 3
+NEXT col
+
+FOR col = 1 TO 10 STEP 2
+    boardState(100 + col) = 3
+NEXT col
+
+UpdateDisplay
+moveMade = 1
+GameLoop
+
+SUB UpdateDisplay
+    ' Draw the pieces on the board
+    FOR row = 1 TO 10
+        FOR col = 1 TO 10
+            pieceType = boardState(((row - 1) * 20) + col)
+            SELECT CASE pieceType
+                CASE 1
+                    CIRCLE (col * 40, row * 18), 17, 1
+                    PAINT (col * 40, row * 18), 1
+                    CIRCLE (col * 40, row * 18), 17, 0
+                    CIRCLE (col * 40, row * 18), 16, 0
+                    LINE ((col * 40) - 16, row * 18)-((col * 40) + 16, row * 18), 0
+                CASE 0
+                    CIRCLE (col * 40, row * 18), 17, 0
+                    PAINT (col * 40, row * 18), 0
+                    CIRCLE (col * 40, row * 18), 17, 1
+                    CIRCLE (col * 40, row * 18), 15, 1
+                    CIRCLE (col * 40, row * 18), 3, 1
+                    CIRCLE (col * 40, row * 18), 7, 1
+                    LINE ((col * 40) - 16, row * 18)-((col * 40) + 16, row * 18), 0
+                CASE 3
+                    PAINT (col * 40, row * 18), 1
+            END SELECT
+        NEXT col
+    NEXT row
+END SUB
+
+SUB CheckPossibleMoves
+    ' Checks if there are any possible moves on the board
+    hasMove = 0
+    FOR cell = 1 TO 200
+        ' Check for possible jumps in all directions
+        IF boardState(cell) = 0 AND boardState(cell - 21) = 1 AND boardState(cell - 42) = 3 THEN hasMove = 1
+        IF boardState(cell) = 0 AND boardState(cell - 19) = 1 AND boardState(cell - 38) = 3 THEN hasMove = 1
+        IF boardState(cell) = 0 AND boardState(cell + 21) = 1 AND boardState(cell + 42) = 3 THEN hasMove = 1
+        IF boardState(cell) = 0 AND boardState(cell + 19) = 1 AND boardState(cell + 38) = 3 THEN hasMove = 1
+    NEXT cell
+END SUB
+
+SUB GameLoop
+    4
+    HandleInput
+    HandleMovement
+    CheckPossibleMoves
+    IF hasMove = 1 THEN SOUND 1234, 2
+    GOTO 4
+END SUB
+
+SUB HandleMovement
+3
+' Check for possible jumps where a AI can eat 2 pieces at once
+FOR cell = 1 TO 200
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 0 AND boardState(cell + 42) = 3 AND boardState(cell + 61) = 0 AND boardState(cell + 80) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 3: boardState(cell + 42) = 1
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 0 AND boardState(cell + 42) = 3 AND boardState(cell + 23) = 0 AND boardState(cell + 4) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 3 : boardState(cell + 42) = 1
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 0 AND boardState(cell + 38) = 3 AND boardState(cell + 59) = 0 AND boardState(cell + 80) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 3 : boardState(cell + 38) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 0 AND boardState(cell + 38) = 3 AND boardState(cell + 17) = 0 AND boardState(cell - 4) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 3 : boardState(cell + 38) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 0 AND boardState(cell + 42) = 3 AND boardState(cell + 63) = 0 AND boardState(cell + 84) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 3 : boardState(cell + 42) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 0 AND boardState(cell + 38) = 3 AND boardState(cell + 57) = 0 AND boardState(cell + 76) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 3 : boardState(cell + 38) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+
+  IF boardState(cell) = 1 AND boardState(cell - 21) = 0 AND boardState(cell - 42) = 3 AND boardState(cell - 61) = 0 AND boardState(cell - 80) = 3 THEN
+    boardState(cell) = 3: boardState(cell - 21) = 3 : boardState(cell - 42) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell - 21) = 0 AND boardState(cell - 42) = 3 AND boardState(cell - 23) = 0 AND boardState(cell - 4) = 3 THEN
+    boardState(cell) = 3: boardState(cell - 21) = 3 : boardState(cell - 42) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell - 19) = 0 AND boardState(cell - 38) = 3 AND boardState(cell - 59) = 0 AND boardState(cell - 80) = 3 THEN
+    boardState(cell) = 3: boardState(cell - 19) = 3 : boardState(cell - 38) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell - 19) = 0 AND boardState(cell - 38) = 3 AND boardState(cell - 17) = 0 AND boardState(cell + 4) = 3 THEN
+    boardState(cell) = 3: boardState(cell - 19) = 3 : boardState(cell - 38) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell - 21) = 0 AND boardState(cell - 42) = 3 AND boardState(cell - 63) = 0 AND boardState(cell - 84) = 3 THEN
+    boardState(cell) = 3: boardState(cell - 21) = 3 : boardState(cell - 42) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell - 19) = 0 AND boardState(cell - 38) = 3 AND boardState(cell - 57) = 0 AND boardState(cell - 76) = 3 THEN
+    boardState(cell) = 3: boardState(cell - 19) = 3 : boardState(cell - 38) = 1
+
+    moveMade = 1
+    UpdateDisplay
+    GOTO 3
+  END IF
+NEXT cell
+
+' Check for possible single moves (single eating)
+FOR cell = 1 TO 200
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 0 AND boardState(cell + 42) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 3 : boardState(cell + 42) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 0 AND boardState(cell + 38) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 3 : boardState(cell + 38) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell - 21) = 0 AND boardState(cell - 42) = 3 THEN
+    boardState(cell) = 3: boardState(cell - 21) = 3 : boardState(cell - 42) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell - 19) = 0 AND boardState(cell - 38) = 3 THEN
+    boardState(cell) = 3: boardState(cell - 19) = 3 : boardState(cell - 38) = 1
+
+    GOTO 2
+  END IF
+NEXT cell
+
+' Check for possible defensive moves (to protect own pieces)
+FOR cell = 1 TO 200
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 AND boardState(cell + 21) = 3 AND boardState(cell + 40) = 1 AND boardState(cell + 38) = 3 AND boardState(cell + 61) = 0 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 AND boardState(cell + 21) = 0 AND boardState(cell + 40) = 1 AND boardState(cell + 38) = 3 AND boardState(cell + 61) = 0 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 AND boardState(cell + 21) = 3 AND boardState(cell + 40) = 1 AND boardState(cell + 38) = 1 AND boardState(cell + 61) = 0 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 AND boardState(cell + 21) = 0 AND boardState(cell + 40) = 1 AND boardState(cell + 38) = 1 AND boardState(cell + 61) = 0 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+
+  IF boardState(cell - 2) = 1 AND boardState(cell + 19) = 3 AND boardState(cell) = 3 AND boardState(cell + 40) = 1 AND boardState(cell + 38) = 3 AND boardState(cell + 61) = 0 THEN
+    boardState(cell - 2) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell - 2) = 1 AND boardState(cell + 19) = 3 AND boardState(cell) = 1 AND boardState(cell + 40) = 1 AND boardState(cell + 38) = 3 AND boardState(cell + 61) = 0 THEN
+    boardState(cell - 2) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell - 2) = 1 AND boardState(cell + 19) = 3 AND boardState(cell) = 3 AND boardState(cell + 40) = 1 AND boardState(cell + 38) = 1 AND boardState(cell + 61) = 0 THEN
+    boardState(cell - 2) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell - 2) = 1 AND boardState(cell + 19) = 3 AND boardState(cell) = 1 AND boardState(cell + 40) = 1 AND boardState(cell + 38) = 1 AND boardState(cell + 61) = 0 THEN
+    boardState(cell - 2) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+NEXT cell
+
+' Check for possible moves to the board edges (to protect own pieces)
+FOR cell = 1 TO 200
+  IF boardState(cell) = 1 AND boardState(cell + 2) = 4 AND boardState(cell + 21) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell - 2) = 4 AND boardState(cell + 19) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+NEXT cell
+
+' Check for possible moves to the corner (safe moves)
+FOR cell = 1 TO 200
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 AND boardState(cell + 38) = 3 AND boardState(cell + 40) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 3 AND boardState(cell + 42) = 3 AND boardState(cell + 40) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 1
+
+    GOTO 2
+  END IF
+
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 AND boardState(cell + 38) = 1 AND boardState(cell + 40) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 3 AND boardState(cell + 42) = 1 AND boardState(cell + 40) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 1
+
+    GOTO 2
+  END IF
+
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 AND boardState(cell + 38) = 3 AND boardState(cell + 40) = 1 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 3 AND boardState(cell + 42) = 3 AND boardState(cell + 40) = 1 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 1
+
+    GOTO 2
+  END IF
+
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 AND boardState(cell + 38) = 1 AND boardState(cell + 40) = 1 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 3 AND boardState(cell + 42) = 1 AND boardState(cell + 40) = 1 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 1
+
+    GOTO 2
+  END IF
+NEXT cell
+
+' Check for any remaining moves that can be made
+FOR cell = 1 TO 200
+  IF boardState(cell) = 1 AND boardState(cell + 21) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 21) = 1
+
+    GOTO 2
+  END IF
+  IF boardState(cell) = 1 AND boardState(cell + 19) = 3 THEN
+    boardState(cell) = 3: boardState(cell + 19) = 1
+
+    GOTO 2
+  END IF
+NEXT cell
+LOCATE 4, 5
+PRINT " Y O U   W O N !"
+END
+GOTO 3
+2
+UpdateDisplay
+9
+END SUB
+
+SUB HandleInput
+    DIM tempImage(1000)
+
+    inputPhase = 1
+
+    5
+    cursorX = ax1
+    cursorY = ax2
+
+    7
+    IF inputPhase = 1 THEN
+        LOCATE 1, 60
+        PRINT "From where ?"
+    END IF
+    IF inputPhase = 2 THEN
+        LOCATE 1, 60
+        PRINT "To where ?  "
+    END IF
+
+
+    selectedCell = (((cursorY \ 18) - 1) * 20) + (cursorX \ 40)
+    'LOCATE 2, 60
+    'PRINT selectedCell
+
+    GET (cursorX, cursorY)-(cursorX + 10, cursorY + 10), tempImage
+    PUT (cursorX, cursorY), cursorImage, PSET
+
+    key$ = INPUT$(1)
+    PUT (cursorX, cursorY), tempImage, PSET
+
+    IF inputPhase = 2 AND key$ = CHR$(13) THEN
+        destinationCell = selectedCell
+        cursorX = ax1
+        cursorY = ax2
+        GOTO 8
+    END IF
+    IF inputPhase = 1 AND key$ = CHR$(13) THEN
+        sourceCell = selectedCell
+        inputPhase = 2
+    END IF
+
+    IF key$ = "q" THEN
+        END
+    END IF
+    IF key$ = "s" THEN
+        cursorX = cursorX + 40
+    END IF
+    IF key$ = "a" THEN
+        cursorX = cursorX - 40
+    END IF
+    IF key$ = "w" THEN
+        cursorY = cursorY - 18
+    END IF
+    IF key$ = "z" THEN
+        cursorY = cursorY + 18
+    END IF
+
+    IF cursorX < 1 THEN
+        cursorX = 1
+    END IF
+
+    IF cursorY < 1 THEN
+        cursorY = 1
+    END IF
+
+    GOTO 7
+
+    8
+    moveMade = 1
+
+    'LOCATE 3, 60
+    'PRINT sourceCell; "-"; destinationCell
+
+    10
+
+    ' This section controls the movement of pieces on the board
+    IF sourceCell = destinationCell + 19 AND boardState(sourceCell) = 0 AND boardState(destinationCell) = 3 THEN
+        BEEP
+        SWAP boardState(sourceCell), boardState(destinationCell)
+    END IF
+    IF sourceCell = destinationCell + 21 AND boardState(sourceCell) = 0 AND boardState(destinationCell) = 3 THEN
+        BEEP
+        SWAP boardState(sourceCell), boardState(destinationCell)
+    END IF
+
+    captureMade = 0
+
+    IF sourceCell = destinationCell + 42 AND boardState(sourceCell) = 0 AND boardState(destinationCell) = 3 AND boardState(destinationCell + 21) = 1 THEN
+        BEEP
+        SWAP boardState(sourceCell), boardState(destinationCell)
+        boardState(destinationCell + 21) = 3
+        captureMade = 1
+    END IF
+    IF sourceCell = destinationCell + 38 AND boardState(sourceCell) = 0 AND boardState(destinationCell) = 3 AND boardState(destinationCell + 19) = 1 THEN
+        BEEP
+        SWAP boardState(sourceCell), boardState(destinationCell)
+        boardState(destinationCell + 19) = 3
+        captureMade = 1
+    END IF
+    IF sourceCell = destinationCell - 42 AND boardState(sourceCell) = 0 AND boardState(destinationCell) = 3 AND boardState(destinationCell - 21) = 1 THEN
+        BEEP
+        SWAP boardState(sourceCell), boardState(destinationCell)
+        boardState(destinationCell - 21) = 3
+        captureMade = 1
+    END IF
+    IF sourceCell = destinationCell - 38 AND boardState(sourceCell) = 0 AND boardState(destinationCell) = 3 AND boardState(destinationCell - 19) = 1 THEN
+        BEEP
+        SWAP boardState(sourceCell), boardState(destinationCell)
+        boardState(destinationCell - 19) = 3
+        captureMade = 1
+    END IF
+
+    UpdateDisplay
+
+    IF captureMade = 1 THEN
+        CheckPossibleMoves
+        IF hasMove = 1 THEN
+            SOUND 1234, 1
+            inputPhase = 2
+            sourceCell = destinationCell
+            GOTO 5
+        END IF
+    END IF
+
+    6
+END SUB
diff --git a/Games/checkers2.bas b/Games/checkers2.bas
new file mode 100755
index 0000000..ca58775
--- /dev/null
+++ b/Games/checkers2.bas
@@ -0,0 +1,501 @@
+' Game of checkers. Supports basic moves. Incomplete.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001, Initial version
+' 2024, Improved program readability
+
+DECLARE SUB compki (m%, h%, x1%, y1%)
+DECLARE SUB compgo2 (h%)
+DECLARE SUB compgo (h%)
+DECLARE SUB humngo (h%)
+DefInt A-Z
+
+DECLARE SUB thinkc ()
+DECLARE SUB thinkh ()
+DECLARE SUB cmd (a$)
+DECLARE SUB freet ()
+DECLARE SUB prn (x%, y%, c%, a$)
+DECLARE SUB msg (a$, c)
+DECLARE SUB getfnt ()
+DECLARE SUB playg ()
+DECLARE SUB geth ()
+DECLARE SUB start ()
+DECLARE SUB mklau ()
+DECLARE SUB showr (x, y)
+DECLARE SUB show ()
+Dim Shared font(0 To 7, 0 To 7, 0 To 255)
+Dim Shared siz, fi, ri, rs
+Dim Shared stri$
+Dim Shared humx1, humy1, humx2, humy2
+Dim Shared sug, smax
+Dim Shared npos As Long
+Dim Shared cx1, cy1, cx2, cy2
+
+siz = 6 ' Board size
+fi = 0
+ri = 2
+smax = 3 ' thinking depth
+
+Dim Shared lau(-1 To siz + 2, -1 To siz + 2)
+
+start
+mklau
+show
+playg
+
+Sub cmd (a$)
+    mitus = 0
+    Dim sona$(1 To 10)
+    For b = 1 To 10
+        sona$(b) = ""
+    Next b
+
+    d = 1
+    e = 1
+    For b = 1 To Len(a$)
+        c$ = Right$(Left$(a$, b), 1)
+        If c$ = " " Then
+            If e = 0 Then d = d + 1: e = 1
+            GoTo 4
+        End If
+        e = 0
+        sona$(d) = sona$(d) + c$
+        4
+    Next b
+    If e = 1 Then d = d - 1
+    mitus = d
+
+    Select Case sona$(1)
+        Case "m"
+            If humx1 > 0 Then msg "Move replaced.", 14
+
+            humx1 = Asc(Left$(sona$(2), 1)) - 64
+            If humx1 > 32 Then humx1 = humx1 - 32
+            humy1 = Val(Right$(sona$(2), Len(sona$(2)) - 1))
+            humx2 = Asc(Left$(sona$(3), 1)) - 64
+            If humx2 > 32 Then humx2 = humx2 - 32
+            humy2 = Val(Right$(sona$(3), Len(sona$(2)) - 1))
+
+        Case "h"
+            msg "h - display help screen", 14
+            msg "q - to quit", 14
+            msg "m <from> <to> - make move", 14
+            msg "n - no. positions processed", 14
+
+        Case "q"
+            System
+
+        Case "n"
+            b$ = "positions processed:" + Str$(npos)
+            msg b$, 14
+
+    End Select
+
+End Sub
+
+Sub compgo (h)
+    If sug > smax Then h = 0: GoTo 6
+    sug = sug + 1
+    npos = npos + 1
+    freet
+    If sug = 1 Then h1 = -2000 Else h1 = -1000
+
+    'cx1 = x: cy1 = y: cx2 = x - 1: cy2 = y + 1
+    b = 0
+    c = 0
+    m = 0
+    For y = 1 To siz ' check for eating
+        For x = 1 To siz
+            If lau(x, y) = 1 Then
+                8
+                If (lau(x - 1, y + 1) = 2) And (lau(x - 2, y + 2) = 0) Then
+                    Swap lau(x, y), lau(x - 2, y + 2)
+                    lau(x - 1, y + 1) = 0
+                    compki m1, h2, x - 2, y + 2
+                    lau(x - 1, y + 1) = 2
+                    Swap lau(x, y), lau(x - 2, y + 2)
+                    m1 = m1 + 1
+                    If m1 > m Then m = m1: h1 = -1000
+                    If m1 = m Then
+                        If h2 + 1 > h1 Then
+                            h1 = h2 + 1
+                            If npos = 1 Then cx1 = x: cy1 = y: cx2 = x - 2: cy2 = y + 2
+                        End If
+                    End If
+                    b = 1
+                End If
+
+                If (lau(x + 1, y + 1) = 2) And (lau(x + 2, y + 2) = 0) Then
+                    Swap lau(x, y), lau(x + 2, y + 2)
+                    lau(x + 1, y + 1) = 0
+                    compki m1, h2, x + 2, y + 2
+                    lau(x + 1, y + 1) = 2
+                    Swap lau(x, y), lau(x + 2, y + 2)
+                    m1 = m1 + 1
+                    If m1 > m Then m = m1: h1 = -1000
+                    If m1 = m Then
+                        If h2 + 1 > h1 Then
+                            h1 = h2 + 1
+                            If npos = 1 Then cx1 = x: cy1 = y: cx2 = x + 2: cy2 = y + 2
+                        End If
+                    End If
+                    b = 1
+                End If
+
+                If (lau(x - 1, y - 1) = 2) And (lau(x - 2, y - 2) = 0) Then
+                    Swap lau(x, y), lau(x - 2, y - 2)
+                    lau(x - 1, y - 1) = 0
+                    compki m1, h2, x - 2, y - 2
+                    lau(x - 1, y - 1) = 2
+                    Swap lau(x, y), lau(x - 2, y - 2)
+                    m1 = m1 + 1
+                    If m1 > m Then m = m1: h1 = -1000
+                    If m1 = m Then
+                        If h2 + 1 > h1 Then
+                            h1 = h2 + 1
+                            If npos = 1 Then cx1 = x: cy1 = y: cx2 = x - 2: cy2 = y - 2
+                        End If
+                    End If
+                    b = 1
+                End If
+
+                If (lau(x + 1, y - 1) = 2) And (lau(x + 2, y - 2) = 0) Then
+                    Swap lau(x, y), lau(x + 2, y - 2)
+                    lau(x + 1, y - 1) = 0
+                    compki m1, h2, x + 2, y - 2
+                    lau(x + 1, y - 1) = 2
+                    Swap lau(x, y), lau(x + 2, y - 2)
+                    m1 = m1 + 1
+                    If m1 > m Then m = m1: h1 = -1000
+                    If m1 = m Then
+                        If h2 + 1 > h1 Then
+                            h1 = h2 + 1
+                            If npos = 1 Then cx1 = x: cy1 = y: cx2 = x + 2: cy2 = y - 2
+                        End If
+                    End If
+                    b = 1
+                End If
+
+                If c = 1 Then GoTo 9
+            End If
+        Next x
+    Next y
+
+    9
+    If (b = 1) And (npos = 1) Then
+        cx3 = (cx1 + cx2) / 2
+        cy3 = (cy1 + cy2) / 2
+        lau(cx3, cy3) = 0
+        showr cx3, cy3
+
+        Swap lau(cx1, cy1), lau(cx2, cy2)
+        showr cx1, cy1
+        showr cx2, cy2
+        msg "NJAM!", 10
+        x = cx2
+        y = cy2
+        c = 1
+        b = 0
+        GoTo 8
+    End If
+    If c = 1 Then
+        cx1 = 1: cy1 = 1: cx2 = 1: cy2 = 1
+        GoTo 10
+    End If
+
+    If sug = 1 Then
+        msg "Cannot eat.", 4
+        msg Str$(h1), 4
+    End If
+
+    For y = 1 To siz ' unuseful move
+        For x = 1 To siz
+            If lau(x, y) = 1 Then
+                If lau(x - 1, y + 1) = 0 Then
+                    Swap lau(x, y), lau(x - 1, y + 1)
+                    humngo h2
+                    Swap lau(x, y), lau(x - 1, y + 1)
+                    If h2 > h1 Then
+                        h1 = h2
+                        If sug = 1 Then cx1 = x: cy1 = y: cx2 = x - 1: cy2 = y + 1
+                    End If
+                End If
+
+                If lau(x + 1, y + 1) = 0 Then
+                    Swap lau(x, y), lau(x + 1, y + 1)
+                    humngo h2
+                    Swap lau(x, y), lau(x + 1, y + 1)
+                    If h2 > h1 Then
+                        h1 = h2
+                        If sug = 1 Then cx1 = x: cy1 = y: cx2 = x + 1: cy2 = y + 1
+                    End If
+                End If
+
+            End If
+        Next x
+    Next y
+    h = h1
+    10
+    sug = sug - 1
+    6
+End Sub
+
+Sub compki (m, h, x1, y1)
+    h1 = 0
+
+    For y = 1 To siz
+        For x = 1 To siz
+        Next x
+    Next y
+    h = h1
+
+End Sub
+
+Sub freet
+    a$ = InKey$
+    If a$ = "" Then
+    Else
+        If a$ = Chr$(8) Then
+            If Len(stri$) > 0 Then
+                stri$ = Left$(stri$, Len(stri$) - 1): GoTo 3
+            End If
+        End If
+        If a$ = Chr$(13) Then
+            If Len(stri$) > 0 Then
+                msg stri$, 7
+                cmd stri$
+                stri$ = ""
+            End If
+            GoTo 3
+        End If
+        stri$ = stri$ + a$
+        3
+        Line (400, 468)-(639, 479), 1, BF
+        prn 405, 469, 14, stri$
+    End If
+End Sub
+
+Sub getfnt
+    Screen 13
+    For a = 0 To 255
+        If (a > 5) And (a < 17) Then GoTo 2
+        Locate 1, 1
+        Print Chr$(a)
+        2
+        For y = 0 To 7
+            For x = 0 To 7
+                font(x, y, a) = Point(x, y)
+            Next x
+        Next y
+    Next a
+
+End Sub
+
+Sub humngo (h)
+    npos = npos + 1
+    h1 = 1000
+
+    For y = siz To 1 Step -1
+        For x = siz To 1 Step -1
+            If lau(x, y) = 2 Then
+                If lau(x - 1, y - 1) = 0 Then
+                    Swap lau(x, y), lau(x - 1, y - 1)
+                    compgo h2
+                    Swap lau(x, y), lau(x - 1, y - 1)
+                    If h2 < h1 Then h1 = h2
+                End If
+
+                If lau(x + 1, y - 1) = 0 Then
+                    Swap lau(x, y), lau(x + 1, y - 1)
+                    compgo h2
+                    Swap lau(x, y), lau(x + 1, y - 1)
+                    If h2 < h1 Then h1 = h2
+                End If
+
+                If (lau(x - 1, y - 1) = 1) And (lau(x - 2, y - 2) = 0) Then
+                    Swap lau(x, y), lau(x - 2, y - 2)
+                    lau(x - 1, y - 1) = 0
+                    humngo h2
+                    lau(x - 1, y - 1) = 1
+                    Swap lau(x, y), lau(x - 2, y - 2)
+                    If h2 - 1 < h1 Then h1 = h2 - 1
+                End If
+
+                If (lau(x + 1, y - 1) = 1) And (lau(x + 2, y - 2) = 0) Then
+                    Swap lau(x, y), lau(x + 2, y - 2)
+                    lau(x + 1, y - 1) = 0
+                    humngo h2
+                    lau(x + 1, y - 1) = 1
+                    Swap lau(x, y), lau(x + 2, y - 2)
+                    If h2 - 1 < h1 Then h1 = h2 - 1
+                End If
+
+            End If
+        Next x
+    Next y
+    h = h1
+End Sub
+
+Sub mklau
+    For y = -1 To siz + 2
+        For x = -1 To siz + 2
+            lau(x, y) = -1
+        Next x
+    Next y
+
+    For y = 1 To siz
+        For x = 1 To siz
+            lau(x, y) = 0
+        Next x
+    Next y
+
+    For y = 1 To ri
+        For x = 1 To siz
+            If (x + y + fi) / 2 = Int((x + y + fi) / 2) Then
+                lau(x, y) = 1
+            End If
+        Next x
+    Next y
+
+    For y = siz - ri + 1 To siz
+        For x = 1 To siz
+            If (x + y + fi) / 2 = Int((x + y + fi) / 2) Then
+                lau(x, y) = 2
+            End If
+        Next x
+    Next y
+
+End Sub
+
+Sub msg (a$, c)
+    Dim buf(1 To 10000)
+    For x = 400 To 630 Step 40
+        Get (x, 8)-(x + 39, 467), buf(1)
+        Put (x, 0), buf(1), PSet
+    Next x
+    Line (400, 460)-(639, 467), 0, BF
+    prn 405, 460, c, a$
+End Sub
+
+Sub playg
+    'GOTO 7
+    1
+    thinkc
+    show
+    7
+    thinkh
+    show
+    GoTo 1
+
+End Sub
+
+Sub prn (x, y, c, a$)
+    x1 = x
+    y1 = y
+    For a = 1 To Len(a$)
+        b = Asc(Right$(Left$(a$, a), 1))
+        For y2 = 0 To 7
+            For x2 = 0 To 7
+                If font(x2, y2, b) > 0 Then PSet (x2 + x1, y2 + y1), c
+            Next x2
+        Next y2
+        x1 = x1 + 8
+    Next a
+End Sub
+
+Sub show
+    For y = 1 To siz
+        For x = 1 To siz
+            showr x, y
+        Next x
+    Next y
+
+    sp = rs / 2
+    For x = 1 To siz
+        prn ((x - 1) * rs + 12 + sp), 2, 10, Chr$(64 + x)
+        prn ((x - 1) * rs + 12 + sp), siz * rs + 11, 10, Chr$(64 + x)
+    Next x
+
+    For y = 1 To siz
+        a$ = Str$(y)
+        a$ = Right$(a$, Len(a$) - 1)
+        prn 15 - (Len(a$) * 8), (y - 1) * rs + sp + 7, 10, a$
+        prn (siz * rs + 16), (y - 1) * rs + sp + 7, 10, a$
+    Next y
+
+End Sub
+
+Sub showr (x, y)
+    If (x + y + fi) / 2 = Int((x + y + fi) / 2) Then c = 8 Else c = 7
+    x1 = (x - 1) * rs + 15
+    y1 = (y - 1) * rs + 10
+    Line (x1, y1)-(x1 + rs - 1, y1 + rs - 1), c, BF
+
+    If lau(x, y) > 0 Then
+        sp = rs / 2
+        If lau(x, y) = 1 Then c1 = 15 Else c1 = 14
+        Circle (x1 + sp, y1 + sp), sp - 1, c1
+        Paint (x1 + sp, y1 + sp), c1
+    End If
+End Sub
+
+Sub start
+    getfnt
+    Screen 12
+    Line (399, 0)-(399, 479), 13
+    msg "Type 'h' for help.", 14
+
+    rs = Int(370 / siz)
+
+End Sub
+
+Sub thinkc
+    msg "Computer turn.", 14
+    sug = 0
+    npos = 0
+    cx1 = -1
+
+    compgo h
+    cmd "n"
+    If cx1 = -1 Then msg "You won!", 10: msg "--------", 10: System
+
+    If h <= -2 Then msg "Oh no...", 10
+    If h = -1 Then msg "Oops!", 10
+    If h = 1 Then msg "Yess! I will eat soon!", 10
+    If h >= 2 Then msg "HA HA HA YOU ARE IN TROUBLE!", 10
+
+    If Abs(cx1 - cx2) = 2 Then
+        cx3 = (cx1 + cx2) / 2
+        cy3 = (cy1 + cy2) / 2
+        lau(cx3, cy3) = 0
+        showr cx3, cy3
+    End If
+
+    Swap lau(cx1, cy1), lau(cx2, cy2)
+    showr cx1, cy1
+    showr cx2, cy2
+
+End Sub
+
+Sub thinkh
+    msg "Your turn.", 14
+    5
+    freet
+    If humx1 = 0 Then GoTo 5
+    Swap lau(humx2, humy2), lau(humx1, humy1)
+    showr humx1, humy1
+    showr humx2, humy2
+    If Abs(humx1 - humx2) = 2 Then
+        cx3 = (humx1 + humx2) / 2
+        cy3 = (humy1 + humy2) / 2
+        lau(cx3, cy3) = 0
+        showr cx3, cy3
+    End If
+
+    humx1 = 0
+End Sub
diff --git a/Games/checkers2.png b/Games/checkers2.png
new file mode 100644
index 0000000..9b4dbf4
Binary files /dev/null and b/Games/checkers2.png differ
diff --git a/Math/3dlife.dat b/Math/3dlife.dat
new file mode 100644
index 0000000..17b0e10
--- /dev/null
+++ b/Math/3dlife.dat
@@ -0,0 +1,13 @@
+.....#.#.....
+...##...##...
+..#.......#..
+.#..##.##..#.
+.#.#.....#.#.
+#..#.###.#..#
+.....#.#.....
+#..#.###.#..#
+.#.#.....#.#.
+.#..##.##..#.
+..#.......#..
+...##...##...
+.....#.#.....
diff --git a/Math/Game of life in 3D.bas b/Math/Game of life in 3D.bas
new file mode 100755
index 0000000..70652ec
--- /dev/null
+++ b/Math/Game of life in 3D.bas	
@@ -0,0 +1,363 @@
+' Program renders rotating 3D animation from cubes.
+' Cubes appear and disappear according to Conway's Game of Life rules.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' ~2000, Initial version
+' 2024 - 2025, Improved program readability
+
+DECLARE SUB PlaceCube (xCoordinate!, yCoordinate!, zCoordinate!)
+DECLARE SUB DrawScene ()
+DECLARE SUB Generate3DScene ()
+DECLARE SUB UpdateCollisionData ()
+DECLARE SUB InitializeGame ()
+
+DIM SHARED totalPoints, totalLines, currentPointCount, currentLineCount
+DIM SHARED pointXCoordinates(1 TO 3000), pointYCoordinates(1 TO 3000), pointZCoordinates(1 TO 3000)
+DIM SHARED renderedPointXCoordinates(1 TO 7000), renderedPointYCoordinates(1 TO 7000)
+DIM SHARED previousRenderedPointXCoordinates(0 TO 9000), previousRenderedPointYCoordinates(0 TO 9000)
+DIM SHARED previousPointCount, previousLineCount
+DIM SHARED lineVertex1Indices(1 TO 3800), lineVertex2Indices(1 TO 3800), lineColorValues(1 TO 3800)
+DIM SHARED previousLineVertex1Indices(1 TO 3800), previousLineVertex2Indices(1 TO 3800)
+DIM SHARED cameraPositionX, cameraPositionY, cameraPositionZ
+DIM SHARED previousCameraPositionX, previousCameraPositionY, previousCameraPositionZ
+DIM SHARED rotationAngle1, rotationAngle2
+DIM SHARED rotationAngle1String, rotationAngle2String
+DIM SHARED currentFrameCount
+DIM SHARED currentGameOfLifeGrid(1 TO 50, 1 TO 50)
+DIM SHARED nextGameOfLifeGrid(1 TO 50, 1 TO 50)
+
+' Main program
+InitializeGame
+rotationAngle1 = 1.5
+
+10
+currentFrameCount = currentFrameCount + 1
+Generate3DScene
+DrawScene
+
+cameraPositionX = SIN(currentFrameCount / 20) * 12
+cameraPositionY = SIN(currentFrameCount / 50) * 10 + 15
+cameraPositionZ = COS(currentFrameCount / 20) * 12
+rotationAngle1 = rotationAngle1 - .05
+rotationAngle2 = 2.2 + SIN(currentFrameCount / 50) / 2
+
+inputKey$ = INKEY$
+IF inputKey$ <> "" THEN SYSTEM
+GOTO 10
+
+SUB Generate3DScene
+    ' This subroutine generates 3D scene of cubes based on the current state of the Game of Life grid.
+    ' It iterates over the grid and places cubes where the grid cells are alive.
+    ' It also updates the grid based on Conway's Game of Life rules every 10 frames.
+
+    currentPointCount = totalPoints
+    currentLineCount = totalLines
+
+    FOR y = 1 TO 50
+        FOR x = 1 TO 50
+            IF currentGameOfLifeGrid(x, y) = 1 THEN
+                value = ABS(x - 26) + ABS(y - 26) + currentFrameCount
+                PlaceCube x - 25, SIN(value / 5) * 5, y - 25
+            END IF
+        NEXT x
+    NEXT y
+
+    IF currentFrameCount \ 10 = currentFrameCount / 10 THEN ' activate every 10-th frame to update grid
+        FOR y = 2 TO 49
+            FOR x = 2 TO 49
+                neighborCount = currentGameOfLifeGrid(x - 1, y - 1)
+                neighborCount = neighborCount + currentGameOfLifeGrid(x, y - 1)
+                neighborCount = neighborCount + currentGameOfLifeGrid(x + 1, y - 1)
+                neighborCount = neighborCount + currentGameOfLifeGrid(x - 1, y)
+                neighborCount = neighborCount + currentGameOfLifeGrid(x + 1, y)
+                neighborCount = neighborCount + currentGameOfLifeGrid(x - 1, y + 1)
+                neighborCount = neighborCount + currentGameOfLifeGrid(x, y + 1)
+                neighborCount = neighborCount + currentGameOfLifeGrid(x + 1, y + 1)
+
+                IF currentGameOfLifeGrid(x, y) = 1 THEN
+                    IF (neighborCount > 3) OR (neighborCount < 2) THEN
+                        nextGameOfLifeGrid(x, y) = 0
+                    ELSE
+                        nextGameOfLifeGrid(x, y) = 1
+                    END IF
+                ELSE
+                    IF neighborCount = 3 THEN
+                        nextGameOfLifeGrid(x, y) = 1
+                    ELSE
+                        nextGameOfLifeGrid(x, y) = 0
+                    END IF
+                END IF
+            NEXT x
+        NEXT y
+
+        FOR y = 1 TO 50
+            FOR x = 1 TO 50
+                currentGameOfLifeGrid(x, y) = nextGameOfLifeGrid(x, y)
+            NEXT x
+        NEXT y
+    END IF
+END SUB
+
+SUB InitializeEnvironment
+    ' This subroutine initializes the environment by creating a grid of points and lines.
+    ' It sets up the initial state of the points and lines arrays.
+
+    FOR z = -5 TO 5
+        FOR x = -5 TO 5
+            currentPointCount = currentPointCount + 1
+            pointXCoordinates(currentPointCount) = x
+            pointYCoordinates(currentPointCount) = 0
+            pointZCoordinates(currentPointCount) = z
+
+            IF x > -5 THEN
+                currentLineCount = currentLineCount + 1
+                lineVertex1Indices(currentLineCount) = currentPointCount
+                lineVertex2Indices(currentLineCount) = currentPointCount - 1
+                lineColorValues(currentLineCount) = 1
+            END IF
+
+            IF z > -5 THEN
+                currentLineCount = currentLineCount + 1
+                lineVertex1Indices(currentLineCount) = currentPointCount
+                lineVertex2Indices(currentLineCount) = currentPointCount - 10
+                lineColorValues(currentLineCount) = 1
+            END IF
+        NEXT x
+    NEXT z
+
+    totalPoints = currentPointCount
+    totalLines = currentLineCount
+END SUB
+
+SUB PlaceCube (xCoordinate, yCoordinate, zCoordinate)
+    ' This subroutine places a cube at the specified coordinates (xCoordinate, yCoordinate, zCoordinate).
+    ' It defines the vertices and edges of the cube and stores them in the respective arrays.
+
+    colorValue = 3
+
+    ' Define the edges of the cube
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 1
+    lineVertex2Indices(currentLineCount) = currentPointCount + 2
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 2
+    lineVertex2Indices(currentLineCount) = currentPointCount + 3
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 3
+    lineVertex2Indices(currentLineCount) = currentPointCount + 4
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 4
+    lineVertex2Indices(currentLineCount) = currentPointCount + 1
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 5
+    lineVertex2Indices(currentLineCount) = currentPointCount + 6
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 6
+    lineVertex2Indices(currentLineCount) = currentPointCount + 7
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 7
+    lineVertex2Indices(currentLineCount) = currentPointCount + 8
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 8
+    lineVertex2Indices(currentLineCount) = currentPointCount + 5
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 1
+    lineVertex2Indices(currentLineCount) = currentPointCount + 5
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 2
+    lineVertex2Indices(currentLineCount) = currentPointCount + 6
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 3
+    lineVertex2Indices(currentLineCount) = currentPointCount + 7
+    lineColorValues(currentLineCount) = colorValue
+
+    currentLineCount = currentLineCount + 1
+    lineVertex1Indices(currentLineCount) = currentPointCount + 4
+    lineVertex2Indices(currentLineCount) = currentPointCount + 8
+    lineColorValues(currentLineCount) = colorValue
+
+    ' Define the vertices of the cube
+    currentPointCount = currentPointCount + 1
+    pointXCoordinates(currentPointCount) = xCoordinate - .5
+    pointYCoordinates(currentPointCount) = yCoordinate
+    pointZCoordinates(currentPointCount) = zCoordinate - .5
+
+    currentPointCount = currentPointCount + 1
+    pointXCoordinates(currentPointCount) = xCoordinate + .5
+    pointYCoordinates(currentPointCount) = yCoordinate
+    pointZCoordinates(currentPointCount) = zCoordinate - .5
+
+    currentPointCount = currentPointCount + 1
+    pointXCoordinates(currentPointCount) = xCoordinate + .5
+    pointYCoordinates(currentPointCount) = yCoordinate
+    pointZCoordinates(currentPointCount) = zCoordinate + .5
+
+    currentPointCount = currentPointCount + 1
+    pointXCoordinates(currentPointCount) = xCoordinate - .5
+    pointYCoordinates(currentPointCount) = yCoordinate
+    pointZCoordinates(currentPointCount) = zCoordinate + .5
+
+    currentPointCount = currentPointCount + 1
+    pointXCoordinates(currentPointCount) = xCoordinate - .5
+    pointYCoordinates(currentPointCount) = yCoordinate + 1
+    pointZCoordinates(currentPointCount) = zCoordinate - .5
+
+    currentPointCount = currentPointCount + 1
+    pointXCoordinates(currentPointCount) = xCoordinate + .5
+    pointYCoordinates(currentPointCount) = yCoordinate + 1
+    pointZCoordinates(currentPointCount) = zCoordinate - .5
+
+    currentPointCount = currentPointCount + 1
+    pointXCoordinates(currentPointCount) = xCoordinate + .5
+    pointYCoordinates(currentPointCount) = yCoordinate + 1
+    pointZCoordinates(currentPointCount) = zCoordinate + .5
+
+    currentPointCount = currentPointCount + 1
+    pointXCoordinates(currentPointCount) = xCoordinate - .5
+    pointYCoordinates(currentPointCount) = yCoordinate + 1
+    pointZCoordinates(currentPointCount) = zCoordinate + .5
+END SUB
+
+SUB DrawScene
+    ' This subroutine renders the scene by transforming the 3D coordinates of the points to 2D screen coordinates
+    ' and drawing the lines between the points. It uses trigonometric functions to rotate and project the 3D points onto the 2D screen.
+
+    sineAngle1 = SIN(rotationAngle1)
+    cosineAngle1 = COS(rotationAngle1)
+    sineAngle2 = SIN(rotationAngle2)
+    cosineAngle2 = COS(rotationAngle2)
+
+    FOR index = 1 TO currentPointCount
+        x = pointXCoordinates(index) + cameraPositionX
+        y = pointYCoordinates(index) - cameraPositionY
+        z = pointZCoordinates(index) + cameraPositionZ
+
+        transformedX = x * sineAngle1 - z * cosineAngle1
+        transformedZ = x * cosineAngle1 + z * sineAngle1
+        transformedY = y * sineAngle2 - transformedZ * cosineAngle2
+        transformedZ2 = y * cosineAngle2 + transformedZ * sineAngle2
+
+        IF transformedZ2 < .5 THEN
+            renderedPointXCoordinates(index) = -1
+        ELSE
+            renderedPointXCoordinates(index) = 320 + (transformedX / transformedZ2 * 400)
+            renderedPointYCoordinates(index) = 240 - (transformedY / transformedZ2 * 400)
+        END IF
+    NEXT index
+
+    FOR index = 1 TO currentLineCount
+        vertex1 = previousLineVertex1Indices(index)
+        vertex2 = previousLineVertex2Indices(index)
+
+        IF previousRenderedPointXCoordinates(vertex1) = -1 OR previousRenderedPointXCoordinates(vertex2) = -1 THEN
+        ELSE
+            LINE (previousRenderedPointXCoordinates(vertex1), previousRenderedPointYCoordinates(vertex1))-(previousRenderedPointXCoordinates(vertex2), previousRenderedPointYCoordinates(vertex2)), 0
+        END IF
+
+        vertex1 = lineVertex1Indices(index)
+        vertex2 = lineVertex2Indices(index)
+
+        IF renderedPointXCoordinates(vertex1) = -1 OR renderedPointXCoordinates(vertex2) = -1 THEN
+        ELSE
+            LINE (renderedPointXCoordinates(vertex1), renderedPointYCoordinates(vertex1))-(renderedPointXCoordinates(vertex2), renderedPointYCoordinates(vertex2)), lineColorValues(index)
+        END IF
+    NEXT index
+
+    IF currentLineCount < previousLineCount THEN
+        FOR index = currentLineCount + 1 TO previousLineCount
+            vertex1 = previousLineVertex1Indices(index)
+            vertex2 = previousLineVertex2Indices(index)
+
+            IF previousRenderedPointXCoordinates(vertex1) = -1 OR previousRenderedPointXCoordinates(vertex2) = -1 THEN
+            ELSE
+                LINE (previousRenderedPointXCoordinates(vertex1), previousRenderedPointYCoordinates(vertex1))-(previousRenderedPointXCoordinates(vertex2), previousRenderedPointYCoordinates(vertex2)), 0
+            END IF
+        NEXT index
+    END IF
+
+    FOR index = 1 TO currentPointCount
+        previousRenderedPointXCoordinates(index) = renderedPointXCoordinates(index)
+        previousRenderedPointYCoordinates(index) = renderedPointYCoordinates(index)
+    NEXT index
+
+    previousPointCount = currentPointCount
+
+    FOR index = 1 TO currentLineCount
+        previousLineVertex1Indices(index) = lineVertex1Indices(index)
+        previousLineVertex2Indices(index) = lineVertex2Indices(index)
+    NEXT index
+
+    previousLineCount = currentLineCount
+END SUB
+
+SUB InitializeGame
+    ' This subroutine initializes the game by setting up the screen, initializing the points and lines arrays,
+    ' and loading the initial state of the Game of Life grid from a file.
+
+    SCREEN 12
+    totalPoints = 0
+    totalLines = 0
+    currentPointCount = totalPoints
+    currentLineCount = totalLines
+    gridSize = 50
+
+    cameraPositionX = 4
+    cameraPositionY = 15
+    cameraPositionZ = 17
+    rotationAngle1 = ATN(1) / 2 - .29
+    rotationAngle2 = rotationAngle1 + 1
+
+    FOR index = 1 TO 1000
+        lineColorValues(index) = 4
+    NEXT index
+
+    FOR index = 1 TO 1000
+        previousLineVertex1Indices(index) = 1
+        previousLineVertex2Indices(index) = 1
+    NEXT index
+
+    OPEN "3dlife.dat" FOR INPUT AS #1
+    y = 20
+
+20
+    IF EOF(1) <> 0 THEN GOTO 30
+    x = 20
+    LINE INPUT #1, inputLine$
+
+    FOR characterIndex = 1 TO LEN(inputLine$)
+        currentChar$ = RIGHT$(LEFT$(inputLine$, characterIndex), 1)
+        IF currentChar$ = "#" THEN currentGameOfLifeGrid(x, y) = 1
+        x = x + 1
+    NEXT characterIndex
+
+    y = y + 1
+    GOTO 20
+
+30
+    CLOSE #1
+END SUB
diff --git a/Math/Game of life in 3D.webm b/Math/Game of life in 3D.webm
new file mode 100644
index 0000000..2b7e1ed
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diff --git a/Math/Game of life/1 b/Math/Game of life/1
new file mode 100644
index 0000000..b411c92
--- /dev/null
+++ b/Math/Game of life/1	
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new file mode 100644
index 0000000..08af0fb
--- /dev/null
+++ b/Math/Game of life/10	
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new file mode 100644
index 0000000..5b8cf86
--- /dev/null
+++ b/Math/Game of life/11	
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new file mode 100644
index 0000000..b5ebe02
--- /dev/null
+++ b/Math/Game of life/2	
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new file mode 100644
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diff --git a/Math/Game of life/4 b/Math/Game of life/4
new file mode 100644
index 0000000..da991a7
--- /dev/null
+++ b/Math/Game of life/4	
@@ -0,0 +1,50 @@
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diff --git a/Math/Game of life/5 b/Math/Game of life/5
new file mode 100644
index 0000000..064f56e
--- /dev/null
+++ b/Math/Game of life/5	
@@ -0,0 +1,50 @@
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diff --git a/Math/Game of life/6 b/Math/Game of life/6
new file mode 100644
index 0000000..fc66375
--- /dev/null
+++ b/Math/Game of life/6	
@@ -0,0 +1,50 @@
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diff --git a/Math/Game of life/7 b/Math/Game of life/7
new file mode 100644
index 0000000..e008167
--- /dev/null
+++ b/Math/Game of life/7	
@@ -0,0 +1,50 @@
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+..................................................
+..................................................
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+..................................................
+..................................................
+.......###........................................
+.........#........................................
+........#.........................................
+..................................................
+........................................###.......
+........................................#.........
+.........................................#........
+..................................................
+..................................................
+..................................................
diff --git a/Math/Game of life/8 b/Math/Game of life/8
new file mode 100644
index 0000000..bb71aee
--- /dev/null
+++ b/Math/Game of life/8	
@@ -0,0 +1,50 @@
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................#.#.#.#.#.#.....................
+.................#.#.#.#.#.#.#....................
+..................#.#.#.#.#.#.....................
+.................#.#.#.#.#.#.#....................
+..................#.#.#.#.#.#.....................
+.................#.#.#.#.#.#.#....................
+..................#.#.#.#.#.#.....................
+.................#.#.#.#.#.#.#....................
+..................#.#.#.#.#.#.....................
+.................#.#.#.#.#.#.#....................
+..................#.#.#.#.#.#.....................
+.................#.#.#.#.#.#.#....................
+..................#.#.#.#.#.#.....................
+..................................................
+..................................................
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+..................................................
+..................................................
diff --git a/Math/Game of life/9 b/Math/Game of life/9
new file mode 100644
index 0000000..ded468e
--- /dev/null
+++ b/Math/Game of life/9	
@@ -0,0 +1,50 @@
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+....................................##............
+..................................##..#...........
+............#####.................#..##...........
+..........#.......#................##.............
+.........#.........#..............................
+.............###..................................
+........#...#...#...#.............................
+........#..#.....#..#.............................
+........#..#.....#..#.............................
+........#..#.....#..#.............................
+........#...#...#...#.............................
+.............###..................................
+.........#.........#..............................
+..........#.......#...............................
+............#####.................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+...................................#####..........
+.................................##.....##........
+................................#.........#.......
+................................#...###...#.......
+...............................#...#...#...#......
+...............................#..#.....#..#......
+...............................#..#.....#..#......
+........#......................#..#.....#..#......
+........##.##..................#...#...#...#......
+............#...................#...###...#.......
+................................#.........#.......
+.................................##.....##........
+...................................#####..........
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
diff --git a/Math/Game of life/Game of life.bas b/Math/Game of life/Game of life.bas
new file mode 100755
index 0000000..ae7adf4
--- /dev/null
+++ b/Math/Game of life/Game of life.bas	
@@ -0,0 +1,454 @@
+' Conway's Game of Life.
+' It has world editor, and can save/load worlds.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001, Initial version
+' 2024 - 2025, Improved program readability
+
+' Usage:
+'
+' Observation Mode
+' ----------------
+'
+' Purpose: Observation mode is the primary mode of the program where
+' you can observe the simulation of Conway's Game of Life. In this
+' mode, the grid evolves according to the rules of the Game of Life,
+' and you can control the simulation's progression, speed, and other
+' aspects.
+
+' Available Keys:
+'
+'     x: Run the simulation for 10,000 cycles. This allows you to
+'     observe the long-term behavior of the grid without manually
+'     advancing each step.
+'
+'     s: Run the simulation for a specified number of cycles. You will
+'     be prompted to enter the number of cycles you want to advance.
+'
+'     n: Run the simulation for 1 cycle. This allows you to step
+'     through the simulation one generation at a time.
+'
+'     z: Stop running the simulation. This halts the automatic
+'     advancement of cycles, allowing you to observe the current state
+'     of the grid.
+'
+'     c: Clear all cells in the grid. This resets the grid to a blank
+'     state, with all cells set to dead.
+'
+'     w: Write the current state of the grid to a file. You will be
+'     prompted to enter a filename. The grid state will be saved in a
+'     format that can be loaded later.
+'
+'     l: Load a grid state from a file. You will be prompted to enter
+'     the filename of the saved grid state. The grid will be loaded
+'     and displayed.
+'
+'     e: Switch to edit mode. This allows you to manually edit the
+'     grid, toggle cells on/off, and perform other editing functions.
+'
+'     q: Quit the program. This exits the simulation and returns you
+'     to the operating system.
+'
+'
+' Edit Mode
+' ---------
+'
+' Purpose: Edit mode allows you to manually edit the grid. You can
+' toggle individual cells on or off, move around the grid, and perform
+' other editing functions. This mode is useful for setting up initial
+' conditions, creating specific patterns, or making adjustments to the
+' grid.
+'
+'Available Keys:
+'
+'    Cursor Keys (Arrow Keys): Move the cursor around the grid. The
+'    cursor highlights the current cell, allowing you to toggle it on
+'    or off.
+'
+'    4, 8, 6, 2: Move the cursor around the grid in large jumps. These
+'    keys allow you to quickly navigate to different areas of the
+'    grid.
+'
+'    s: Switch to select mode. This allows you to select a region of
+'    the grid for copying or cutting.
+'
+'    v: Paste the contents of the copy buffer to the current cursor
+'    position. This is useful for duplicating patterns or restoring
+'    cut regions.
+'
+'    SPACE: Toggle the current cell on or off. If the cell is alive,
+'    it will be set to dead, and vice versa.
+'
+'    ESC: Return to observing mode. This exits edit mode and returns
+'    you to the primary observation mode, where you can observe the
+'    simulation.
+'
+'
+' Select Mode
+' -----------
+'
+' Purpose: Select mode is a sub-mode of edit mode that allows you to
+' select a region of the grid. You can copy or cut the selected
+' region, which can then be pasted elsewhere in the grid.
+'
+' Available Keys:
+'
+'     Cursor Keys (Arrow Keys): Adjust the selection rectangle. You
+'     can resize the selection by moving the cursor.
+'
+'     4, 8, 6, 2: Adjust the selection rectangle in large jumps. These
+'     keys allow you to quickly resize the selection.
+'
+'     c: Copy the selected region to the copy buffer. The selected
+'     region remains intact on the grid.
+'
+'     x: Cut the selected region to the copy buffer. The selected
+'     region is cleared from the grid and copied to the buffer.
+'
+'     ESC: Return to edit mode. This exits select mode and returns you
+'     to edit mode, where you can continue editing the grid.
+'
+
+DECLARE SUB LoadGridFromFile ()
+DECLARE SUB SaveGridToFile ()
+DECLARE SUB DisplayCopyBuffer ()
+DEFINT A-Z
+DECLARE SUB EnterSelectMode (gridX, gridY)
+DECLARE SUB ClearGridBuffers ()
+DECLARE SUB EnterEditMode ()
+DECLARE SUB DisplayGridState ()
+DECLARE SUB ClearScreenLine ()
+DECLARE SUB ProcessLifeGeneration ()
+DECLARE SUB InitializeSimulation ()
+
+DIM SHARED gridBufferA(1 TO 50, 1 TO 50)
+DIM SHARED gridBufferB(1 TO 50, 1 TO 50)
+DIM SHARED currentBuffer
+DIM SHARED generationCount
+DIM SHARED autoAdvanceCount
+DIM SHARED copyBuffer(0 TO 50, 0 TO 50)
+DIM SHARED copyBufferWidth, copyBufferHeight
+
+InitializeSimulation
+
+1
+ProcessLifeGeneration
+generationCount = generationCount + 1
+
+2
+LOCATE 1, 27
+PRINT "frame:" + STR$(generationCount) + "   "
+LOCATE 2, 27
+PRINT "skip:" + STR$(autoAdvanceCount) + "   "
+userInput$ = INKEY$
+
+IF userInput$ = "s" THEN
+    LOCATE 5, 27
+    INPUT "skip ", autoAdvanceCount
+    ClearScreenLine
+END IF
+
+IF userInput$ = "q" THEN
+    SYSTEM
+END IF
+
+IF userInput$ = "n" THEN GOTO 1
+IF userInput$ = "c" THEN ClearGridBuffers
+IF userInput$ = "e" THEN EnterEditMode
+IF userInput$ = "z" THEN autoAdvanceCount = 0
+IF userInput$ = "x" THEN autoAdvanceCount = 10000
+IF userInput$ = "w" THEN SaveGridToFile
+IF userInput$ = "l" THEN LoadGridFromFile
+
+IF autoAdvanceCount > 0 THEN
+    autoAdvanceCount = autoAdvanceCount - 1
+    GOTO 1
+END IF
+
+GOTO 2
+
+SUB ClearGridBuffers
+' Clears the grid buffers and resets the simulation counters.
+FOR gridY = 1 TO 50
+    FOR gridX = 1 TO 50
+        gridBufferA(gridX, gridY) = 0
+        gridBufferB(gridX, gridY) = 0
+    NEXT gridX
+NEXT gridY
+currentBuffer = 0
+generationCount = 0
+autoAdvanceCount = 0
+DisplayGridState
+END SUB
+
+SUB ClearScreenLine
+' Clears a specific line on the screen.
+LOCATE 5, 27
+PRINT "              "
+END SUB
+
+SUB DisplayGridState
+' Displays the current state of the grid.
+FOR gridY = 1 TO 50
+    FOR gridX = 1 TO 50
+        IF currentBuffer = 0 THEN cellState = gridBufferA(gridX, gridY) ELSE cellState = gridBufferB(gridX, gridY)
+        IF cellState = 0 THEN cellState = 1 ELSE cellState = 10
+        LINE (gridX * 4, gridY * 4)-(gridX * 4 + 2, gridY * 4 + 2), cellState, BF
+    NEXT gridX
+NEXT gridY
+END SUB
+
+SUB EnterEditMode
+' Allows the user to edit the grid manually.
+cursorX = 25
+cursorY = 25
+
+3
+IF cursorX < 1 THEN cursorX = 1
+IF cursorY < 1 THEN cursorY = 1
+IF cursorX > 50 THEN cursorX = 50
+IF cursorY > 49 THEN cursorY = 49
+
+IF currentBuffer = 0 THEN cellState = gridBufferA(cursorX, cursorY) ELSE cellState = gridBufferB(cursorX, cursorY)
+IF cellState = 0 THEN cellState = 1 ELSE cellState = 10
+LINE (cursorX * 4, cursorY * 4)-(cursorX * 4 + 2, cursorY * 4 + 2), cellState, BF
+LINE (cursorX * 4 - 1, cursorY * 4 - 1)-(cursorX * 4 + 3, cursorY * 4 + 3), 14, B
+
+4
+userInput$ = INKEY$
+IF userInput$ = "" THEN GOTO 4
+LINE (cursorX * 4 - 1, cursorY * 4 - 1)-(cursorX * 4 + 3, cursorY * 4 + 3), 0, B
+
+' Handle cursor movement
+IF userInput$ = CHR$(0) + "M" THEN cursorX = cursorX + 1 ' Right arrow
+IF userInput$ = CHR$(0) + "K" THEN cursorX = cursorX - 1 ' Left arrow
+IF userInput$ = CHR$(0) + "P" THEN cursorY = cursorY + 1 ' Down arrow
+IF userInput$ = CHR$(0) + "H" THEN cursorY = cursorY - 1 ' Up arrow
+
+' Handle large jumps
+IF userInput$ = "6" THEN cursorX = cursorX + 8
+IF userInput$ = "4" THEN cursorX = cursorX - 8
+IF userInput$ = "2" THEN cursorY = cursorY + 8
+IF userInput$ = "8" THEN cursorY = cursorY - 8
+
+IF userInput$ = CHR$(27) THEN GOTO 5 ' ESC key to exit edit mode
+IF userInput$ = "s" THEN EnterSelectMode cursorX, cursorY
+
+' Paste from copy buffer
+IF userInput$ = "v" THEN
+    FOR pasteY = 0 TO copyBufferHeight
+        FOR pasteX = 0 TO copyBufferWidth
+            cellState = copyBuffer(pasteX, pasteY)
+            gridX = pasteX + cursorX
+            gridY = pasteY + cursorY
+            IF (gridX < 50) AND (gridY < 50) THEN
+                IF currentBuffer = 0 THEN gridBufferA(gridX, gridY) = cellState ELSE gridBufferB(gridX, gridY) = cellState
+            END IF
+        NEXT pasteX
+    NEXT pasteY
+    DisplayGridState
+END IF
+
+' Toggle cell on/off
+IF userInput$ = " " THEN
+    IF currentBuffer = 0 THEN cellState = gridBufferA(cursorX, cursorY) ELSE cellState = gridBufferB(cursorX, cursorY)
+    IF cellState = 1 THEN cellState = 0 ELSE cellState = 1
+    IF currentBuffer = 0 THEN gridBufferA(cursorX, cursorY) = cellState ELSE gridBufferB(cursorX, cursorY) = cellState
+END IF
+
+GOTO 3
+
+5
+END SUB
+
+SUB InitializeSimulation
+' Initializes the screen and buffers.
+SCREEN 13
+RANDOMIZE TIMER
+copyBufferWidth = 0
+copyBufferHeight = 0
+ClearGridBuffers
+END SUB
+
+SUB LoadGridFromFile
+' Loads a grid state from a file.
+ClearGridBuffers
+LOCATE 5, 27
+INPUT "file ", fileName$
+ClearScreenLine
+gridY = 1
+OPEN fileName$ FOR INPUT AS #1
+
+9
+IF EOF(1) <> 0 THEN GOTO 10
+LINE INPUT #1, fileLine$
+FOR gridX = 1 TO LEN(fileLine$)
+    fileChar$ = RIGHT$(LEFT$(fileLine$, gridX), 1)
+    IF fileChar$ = "#" THEN cellState = 1 ELSE cellState = 0
+    IF currentBuffer = 0 THEN gridBufferA(gridX, gridY) = cellState ELSE gridBufferB(gridX, gridY) = cellState
+NEXT gridX
+gridY = gridY + 1
+GOTO 9
+
+10
+CLOSE #1
+DisplayGridState
+END SUB
+
+SUB ProcessLifeGeneration
+' Processes one generation of Conway's Game of Life.
+IF currentBuffer = 0 THEN
+    FOR gridY = 2 TO 48
+        FOR gridX = 2 TO 49
+            IF gridBufferA(gridX - 1, gridY - 1) = 1 THEN neighborCount = 1 ELSE neighborCount = 0
+            IF gridBufferA(gridX, gridY - 1) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferA(gridX + 1, gridY - 1) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferA(gridX - 1, gridY) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferA(gridX + 1, gridY) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferA(gridX - 1, gridY + 1) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferA(gridX, gridY + 1) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferA(gridX + 1, gridY + 1) = 1 THEN neighborCount = neighborCount + 1
+
+            ' Apply Game of Life rules
+            IF gridBufferA(gridX, gridY) = 1 THEN
+                IF neighborCount = 2 OR neighborCount = 3 THEN gridBufferB(gridX, gridY) = 1 ELSE gridBufferB(gridX, gridY) = 0
+            ELSE
+                IF neighborCount = 3 THEN gridBufferB(gridX, gridY) = 1 ELSE gridBufferB(gridX, gridY) = 0
+            END IF
+        NEXT gridX
+    NEXT gridY
+    currentBuffer = 1
+    DisplayGridState
+ELSE ' Process second half of the grid
+    FOR gridY = 2 TO 48
+        FOR gridX = 2 TO 49
+            IF gridBufferB(gridX - 1, gridY - 1) = 1 THEN neighborCount = 1 ELSE neighborCount = 0
+            IF gridBufferB(gridX, gridY - 1) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferB(gridX + 1, gridY - 1) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferB(gridX - 1, gridY) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferB(gridX + 1, gridY) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferB(gridX - 1, gridY + 1) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferB(gridX, gridY + 1) = 1 THEN neighborCount = neighborCount + 1
+            IF gridBufferB(gridX + 1, gridY + 1) = 1 THEN neighborCount = neighborCount + 1
+
+            ' Apply Game of Life rules
+            IF gridBufferB(gridX, gridY) = 1 THEN
+                IF neighborCount = 2 OR neighborCount = 3 THEN gridBufferA(gridX, gridY) = 1 ELSE gridBufferA(gridX, gridY) = 0
+            ELSE
+                IF neighborCount = 3 THEN gridBufferA(gridX, gridY) = 1 ELSE gridBufferA(gridX, gridY) = 0
+            END IF
+        NEXT gridX
+    NEXT gridY
+    currentBuffer = 0
+    DisplayGridState
+END IF
+END SUB
+
+SUB EnterSelectMode (gridX, gridY)
+' Allows the user to select a region of the grid.
+cursorX = gridX * 4 - 1 ' Calculate initial x position for selection rectangle
+cursorY = gridY * 4 - 1 ' Calculate initial y position for selection rectangle
+selectionEndX = gridX + 2 ' Initialize end x position for selection rectangle
+selectionEndY = gridY + 2 ' Initialize end y position for selection rectangle
+
+6
+selectionRightEdge = selectionEndX * 4 + 3 ' Calculate right edge of selection rectangle
+selectionBottomEdge = selectionEndY * 4 + 3 ' Calculate bottom edge of selection rectangle
+
+' Draw selection rectangle
+LINE (cursorX, cursorY)-(selectionRightEdge, selectionBottomEdge), 14, B
+
+8
+userInput$ = INKEY$
+IF userInput$ = "" THEN GOTO 8
+
+' Erase selection rectangle
+LINE (cursorX, cursorY)-(selectionRightEdge, selectionBottomEdge), 0, B
+
+' Handle cursor movement
+IF userInput$ = CHR$(0) + "M" THEN selectionEndX = selectionEndX + 1 ' Right arrow
+IF userInput$ = CHR$(0) + "K" THEN selectionEndX = selectionEndX - 1 ' Left arrow
+IF userInput$ = CHR$(0) + "P" THEN selectionEndY = selectionEndY + 1 ' Down arrow
+IF userInput$ = CHR$(0) + "H" THEN selectionEndY = selectionEndY - 1 ' Up arrow
+
+' Handle large jumps
+IF userInput$ = "6" THEN selectionEndX = selectionEndX + 8
+IF userInput$ = "4" THEN selectionEndX = selectionEndX - 8
+IF userInput$ = "2" THEN selectionEndY = selectionEndY + 8
+IF userInput$ = "8" THEN selectionEndY = selectionEndY - 8
+
+IF userInput$ = CHR$(27) THEN GOTO 7 ' ESC key to exit select mode
+
+IF userInput$ = "c" THEN
+    copyBufferWidth = selectionEndX - gridX ' Calculate size of selection rectangle
+    copyBufferHeight = selectionEndY - gridY
+    FOR sourceY = gridY TO selectionEndY
+        FOR sourceX = gridX TO selectionEndX
+            IF currentBuffer = 0 THEN cellState = gridBufferA(sourceX, sourceY) ELSE cellState = gridBufferB(sourceX, sourceY)
+            copyBuffer(sourceX - gridX, sourceY - gridY) = cellState ' Copy selection to buffer
+        NEXT sourceX
+    NEXT sourceY
+    DisplayCopyBuffer ' Display copied selection
+END IF
+
+IF userInput$ = "x" THEN
+    copyBufferWidth = selectionEndX - gridX ' Calculate size of selection rectangle
+    copyBufferHeight = selectionEndY - gridY
+    FOR sourceY = gridY TO selectionEndY
+        FOR sourceX = gridX TO selectionEndX
+            IF currentBuffer = 0 THEN cellState = gridBufferA(sourceX, sourceY): gridBufferA(sourceX, sourceY) = 0 ELSE cellState = gridBufferB(sourceX, sourceY): gridBufferB(sourceX, sourceY) = 0 ' Clear selection
+            copyBuffer(sourceX - gridX, sourceY - gridY) = cellState ' Copy cleared selection to buffer
+        NEXT sourceX
+    NEXT sourceY
+    DisplayCopyBuffer ' Display cut selection
+    DisplayGridState ' Update grid
+END IF
+
+GOTO 6
+
+7
+END SUB
+
+SUB DisplayCopyBuffer
+' Displays the contents of the copy buffer.
+cursorX = copyBufferWidth ' Calculate width of copied selection
+IF cursorX > 15 THEN cursorX = 15
+cursorY = copyBufferHeight ' Calculate height of copied selection
+IF cursorY > 15 THEN cursorY = 15
+
+' Draw copy buffer rectangle
+LINE (204, 99)-(319, 199), 0, BF
+LINE (204, 99)-(208 + 4 * cursorX, 103 + 4 * cursorY), 14, B
+
+FOR bufferY = 0 TO cursorY ' Iterate over copied selection
+    FOR bufferX = 0 TO cursorX
+        cellState = copyBuffer(bufferX, bufferY) ' Get color of cell in copy buffer
+        IF cellState = 0 THEN cellState = 1 ELSE cellState = 10 ' Convert to display color
+        LINE (bufferX * 4 + 205, bufferY * 4 + 100)-(bufferX * 4 + 2 + 205, bufferY * 4 + 2 + 100), cellState, BF ' Draw cell in copy buffer
+    NEXT bufferX
+NEXT bufferY
+END SUB
+
+SUB SaveGridToFile
+' Saves the current grid state to a file.
+LOCATE 5, 27
+INPUT "file ", fileName$
+ClearScreenLine
+OPEN fileName$ FOR OUTPUT AS #1
+
+FOR gridY = 1 TO 50
+    fileLine$ = "" ' Initialize line string
+    FOR gridX = 1 TO 50
+        IF currentBuffer = 0 THEN cellState = gridBufferA(gridX, gridY) ELSE cellState = gridBufferB(gridX, gridY)
+        IF cellState = 0 THEN fileLine$ = fileLine$ + "." ELSE fileLine$ = fileLine$ + "#" ' Convert to file format
+    NEXT gridX
+    PRINT #1, fileLine$ ' Write line to file
+NEXT gridY
+
+CLOSE #1
+END SUB
diff --git a/Math/Game of life/e b/Math/Game of life/e
new file mode 100644
index 0000000..1ca8715
--- /dev/null
+++ b/Math/Game of life/e	
@@ -0,0 +1,50 @@
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+.................####.............####............
+.....................#...........#................
+...................####.........#.................
+.......................#...#...#..................
+........................#.#.#.#...................
+.................#########...#########............
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
+..................................................
diff --git a/Math/Game of life/index.html b/Math/Game of life/index.html
new file mode 100644
index 0000000..ce986cd
--- /dev/null
+++ b/Math/Game of life/index.html	
@@ -0,0 +1,12 @@
+<HTML>
+<HEAD><TITLE>life</TITLE></HEAD>
+
+<BODY text=#A0A0ff vLink=#0000ff aLink=#0000ff link=#0000ff bgColor=#000000>
+
+<CENTER><H1>life</H1></CENTER>
+<BR>Conway's game of life. Simple editor with copy and paste
+functionality and simulator.
+
+<BR><IMG SRC="sshot.png">
+</BODY>
+</HTML>
\ No newline at end of file
diff --git a/Math/Game of life/screenshot.png b/Math/Game of life/screenshot.png
new file mode 100644
index 0000000..f1ca1c7
Binary files /dev/null and b/Math/Game of life/screenshot.png differ
diff --git a/Math/Lottery/Lottery analysis.bas b/Math/Lottery/Lottery analysis.bas
new file mode 100755
index 0000000..59870ad
--- /dev/null
+++ b/Math/Lottery/Lottery analysis.bas	
@@ -0,0 +1,303 @@
+DECLARE SUB loadData ()
+DECLARE SUB predictNextDraw ()
+DECLARE SUB parseDrawNumbers (drawString$)
+DECLARE SUB displayDotGraph ()
+DECLARE SUB waitForUserInput ()
+DECLARE SUB displayLineGraph ()
+DECLARE SUB displayCombinatoricsGraph ()
+DECLARE SUB displayMenu ()
+DECLARE SUB startProgram ()
+' Program to analyze lottery winning numbers.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+'
+'
+' This program is designed to analyze lottery winning numbers. It
+' provides various graphical representations and statistical insights
+' based on historical lottery data. The program offers a simple
+' menu-driven interface to visualize and analyze the data.
+'
+' Features:
+'
+'     Data Loading: The program loads historical lottery data from a
+'     text file named "loto.txt". Each line in the file represents a
+'     single draw, with numbers separated by spaces.
+'
+'     Graphical Representations:
+'
+'         Dot Graph: Displays the lottery numbers as dots on a graph,
+'         with vertical lines representing each draw.
+'
+'         Line Graph: Shows a dynamic line graph connecting
+'         consecutive lottery numbers, providing a visual
+'         representation of number trends over time.
+'
+'         Combinatorics Graph: Graph is fitted to every possible
+'         resolution. If there are patterns in data, they would likely
+'         be visible it some resolutions.
+'
+'     Statistical Analysis: Analyzes the last 10 draws to predict the
+'     most frequent numbers and identifies numbers that have appeared
+'     least recently.
+'
+'
+' Input File Format: The input file loto.txt should be formatted as
+' follows:
+'
+'     Each line represents a single lottery draw.
+'
+'     The first number on each line is the draw sequence number.
+'
+'     The subsequent numbers are the lottery numbers drawn, separated
+'     by spaces. 6 numbers per draw.
+'
+' Example:
+'
+' 1 7 15 16 23 34 38
+' 2 2 15 17 25 37 40
+' 3 9 16 18 23 25 45
+' ...
+' 500 4 15 16 24 30 46
+'
+'
+'
+' Changelog:
+' 2001, Initial version
+' 2024 - 2025, Improved program readability
+
+
+DEFINT A-Y
+
+DIM SHARED totalDraws, drawNumbers$(1 TO 50)
+DIM SHARED lotteryNumbers(1 TO 500, 1 TO 7)
+DIM SHARED currentDraw
+
+startProgram
+loadData
+
+displayMenu
+
+SUB displayCombinatoricsGraph
+    CLS
+    PAINT (1, 1), 3
+    DIM buffer(1 TO 48)
+    DIM buffer2(1 TO 20000)
+
+    totalNumbers = 0
+
+    ' Prepare data for drawing
+    FOR drawIndex = 1 TO currentDraw
+        FOR number = 1 TO 48
+            buffer(number) = 0
+        NEXT number
+
+        FOR numberPosition = 2 TO 7
+            buffer(lotteryNumbers(drawIndex, numberPosition)) = 10
+        NEXT numberPosition
+
+        FOR number = 1 TO 48
+            totalNumbers = totalNumbers + 1
+            buffer2(totalNumbers) = buffer(number)
+        NEXT number
+    NEXT drawIndex
+
+    ' Draw the graph
+    FOR yAxisValue = 2 TO 400
+        xAxisValue = 0
+        FOR xPosition = 1 TO 639
+            FOR yPosition = 1 TO yAxisValue
+                xAxisValue = xAxisValue + 1
+                IF xAxisValue > totalNumbers THEN GOTO skipDrawing
+                PSET (xPosition, yPosition), buffer2(xAxisValue)
+            NEXT yPosition
+        NEXT xPosition
+skipDrawing:
+
+        LINE (xPosition + 1, 1)-(xPosition + 1, yAxisValue), 14
+        LINE (xPosition + 1, yPosition)-(xPosition + 4, yPosition), 12
+
+        IF INKEY$ <> "" THEN GOTO 1
+    NEXT yAxisValue
+
+waitForUserInput
+1
+END SUB
+
+SUB displayDotGraph
+    CLS
+    LINE (0, 0)-(600, 0), 1
+    LINE (0, 49)-(600, 49), 1
+    LINE (0, 50)-(600, 50), 1
+    LINE (0, 48 * 6 + 51)-(600, 48 * 6 + 51), 1
+
+    ' Draw vertical lines for each draw and plot numbers
+    FOR drawIndex = 1 TO currentDraw
+        totalNumbers = 0
+        FOR numberPosition = 2 TO 7
+            totalNumbers = totalNumbers + lotteryNumbers(drawIndex, numberPosition)
+            PSET (drawIndex, lotteryNumbers(drawIndex, numberPosition)), 15
+        NEXT numberPosition
+        LINE (drawIndex, totalNumbers + 50)-(drawIndex, 24 * 6 + 50), 10
+    NEXT drawIndex
+
+    waitForUserInput
+END SUB
+
+SUB displayLineGraph
+    CLS
+    DIM buffer(1 TO 20000)
+
+    ' Draw lines connecting consecutive lottery numbers
+    FOR x = 1 TO currentDraw - 1
+        FOR numberPosition = 2 TO 7
+            LINE (600, lotteryNumbers(x, numberPosition))-(610, lotteryNumbers(x + 1, numberPosition)), 3
+        NEXT numberPosition
+        LINE (600, 1)-(600, 48), 1
+        SOUND 0, 2
+
+        ' Scroll the screen to the left
+        GET (10, 1)-(610, 50), buffer(1)
+        PUT (1, 1), buffer(1), PSET
+        LINE (601, 1)-(610, 50), 0, BF
+
+        IF INKEY$ <> "" GOTO 5
+    NEXT x
+
+    waitForUserInput
+5
+END SUB
+
+SUB displayMenu
+menuLoop:
+    CLS
+
+7
+    LOCATE 1, 1
+
+    PRINT "           Lottery statistics analysis"
+
+    PRINT "1 - Dot graph"
+    PRINT "2 - Line graph"
+    PRINT "3 - Combinatorics"
+    PRINT "4 - Statistics"
+    PRINT "5 - Exit program"
+
+    userInput$ = INPUT$(1)
+
+    IF userInput$ = "1" THEN displayDotGraph
+    IF userInput$ = "2" THEN displayLineGraph
+    IF userInput$ = "3" THEN displayCombinatoricsGraph
+    IF userInput$ = "4" THEN predictNextDraw: GOTO 7
+    IF userInput$ = "5" THEN SYSTEM
+
+    GOTO menuLoop
+
+END SUB
+
+SUB loadData
+    PRINT "One moment..."
+
+    currentDraw = 0
+    OPEN "loto.txt" FOR INPUT AS #1
+
+loadNextLine:
+    IF EOF(1) <> 0 THEN GOTO endOfFile
+
+    LINE INPUT #1, drawString$
+    parseDrawNumbers drawString$
+
+    currentDraw = currentDraw + 1
+
+    ' Parse and store lottery numbers
+    FOR numberPosition = 1 TO 7
+        lotteryNumbers(currentDraw, numberPosition) = VAL(drawNumbers$(numberPosition))
+    NEXT numberPosition
+
+    GOTO loadNextLine
+
+endOfFile:
+    CLOSE #1
+
+    CLS
+END SUB
+
+SUB parseDrawNumbers (drawString$)
+    totalDraws = 0
+
+    numberIndex = 1
+    FOR charPosition = 1 TO LEN(drawString$)
+        currentChar$ = RIGHT$(LEFT$(drawString$, charPosition), 1)
+        IF currentChar$ = " " THEN
+            numberIndex = 1
+        ELSE
+            IF numberIndex = 1 THEN
+                totalDraws = totalDraws + 1
+                drawNumbers$(totalDraws) = ""
+                numberIndex = 0
+            END IF
+            drawNumbers$(totalDraws) = drawNumbers$(totalDraws) + currentChar$
+        END IF
+    NEXT charPosition
+
+END SUB
+
+SUB predictNextDraw
+    DIM buffer(1 TO 48)
+    PRINT "During the last 10 draws:"
+
+    ' Count occurrences of each number in the last 10 draws
+    FOR drawIndex = currentDraw - 10 TO currentDraw
+        FOR numberPosition = 2 TO 7
+            buffer(lotteryNumbers(drawIndex, numberPosition)) = buffer(lotteryNumbers(drawIndex, numberPosition)) + 1
+        NEXT numberPosition
+    NEXT drawIndex
+
+    ' Print the most frequent numbers
+    FOR position = 1 TO 6
+        maxCount = 0
+        FOR number = 1 TO 48
+            IF buffer(number) > maxCount THEN
+                maxCount = buffer(number)
+                mostFrequentNumber = number
+            END IF
+        NEXT number
+        PRINT mostFrequentNumber; " appeared: "; maxCount; " times"
+        buffer(mostFrequentNumber) = 0
+    NEXT position
+
+    PRINT "--------------------------------------"
+
+    ' Find when each number last appeared
+    FOR drawIndex = 1 TO currentDraw
+        FOR numberPosition = 2 TO 7
+            buffer(lotteryNumbers(drawIndex, numberPosition)) = drawIndex
+        NEXT numberPosition
+    NEXT drawIndex
+
+    FOR position = 1 TO 6
+        minAppearances = 30000
+        FOR number = 1 TO 48
+            IF buffer(number) < minAppearances THEN
+                minAppearances = buffer(number)
+                leastRecentNumber = number
+            END IF
+        NEXT number
+        PRINT leastRecentNumber; " appeared last time: "; currentDraw - minAppearances; " draws ago"
+        buffer(leastRecentNumber) = 30000
+    NEXT position
+
+END SUB
+
+SUB startProgram
+    SCREEN 12
+
+END SUB
+
+SUB waitForUserInput
+    userInput$ = INPUT$(1)
+
+END SUB
diff --git a/Math/Lottery/loto.txt b/Math/Lottery/loto.txt
new file mode 100644
index 0000000..f7238f1
--- /dev/null
+++ b/Math/Lottery/loto.txt
@@ -0,0 +1,281 @@
+1 2 10 13 25 32 48
+2 1 3 15 27 33 40
+3 9 16 18 23 25 45
+4 2 3 15 21 27 45
+5 3 5 8 13 29 39
+6 5 11 20 22 27 41
+7 6 9 12 13 39 45
+8 3 18 21 28 37 38
+9 5 13 16 36 37 39
+10 4 15 16 24 30 46
+11 1 7 10 25 32 38
+12 2 15 17 25 37 40
+13 9 16 18 23 25 45
+14 2 3 15 21 27 45
+15 3 5 8 13 29 39
+16 5 11 20 22 27 41
+17 6 9 12 13 39 45
+18 3 18 21 28 37 38
+19 5 13 16 36 37 39
+20 4 15 16 24 30 46
+21 1 7 10 25 32 38
+22 2 15 17 25 37 40
+23 9 16 18 23 25 45
+24 2 3 15 21 27 45
+25 3 5 8 13 29 39
+26 5 11 20 22 27 41
+27 6 9 12 13 39 45
+28 3 18 21 28 37 38
+29 5 13 16 36 37 39
+30 4 15 16 24 30 46
+31 1 7 10 25 32 38
+32 2 15 17 25 37 40
+33 9 16 18 23 25 45
+34 2 3 15 21 27 45
+35 3 5 8 13 29 39
+36 5 11 20 22 27 41
+37 6 9 12 13 39 45
+38 3 18 21 28 37 38
+39 5 13 16 36 37 39
+40 4 15 16 24 30 46
+41 1 7 10 25 32 38
+42 2 15 17 25 37 40
+43 9 16 18 23 25 45
+44 2 3 15 21 27 45
+45 3 5 8 13 29 39
+46 5 11 20 22 27 41
+47 6 9 12 13 39 45
+48 3 18 21 28 37 38
+49 5 13 16 36 37 39
+50 4 15 16 24 30 46
+51 1 7 10 25 32 38
+52 2 15 17 25 37 40
+53 9 16 18 23 25 45
+54 2 3 15 21 27 45
+55 3 5 8 13 29 39
+56 5 11 20 22 27 41
+57 6 9 12 13 39 45
+58 3 18 21 28 37 38
+59 5 13 16 36 37 39
+60 4 15 16 24 30 46
+61 1 7 10 25 32 38
+62 2 15 17 25 37 40
+63 9 16 18 23 25 45
+64 2 3 15 21 27 45
+65 3 5 8 13 29 39
+66 5 11 20 22 27 41
+67 6 9 12 13 39 45
+68 3 18 21 28 37 38
+69 5 13 16 36 37 39
+70 4 15 16 24 30 46
+71 1 7 10 25 32 38
+72 2 15 17 25 37 40
+73 9 16 18 23 25 45
+74 2 3 15 21 27 45
+75 3 5 8 13 29 39
+76 5 11 20 22 27 41
+77 6 9 12 13 39 45
+78 3 18 21 28 37 38
+79 5 13 16 36 37 39
+80 4 15 16 24 30 46
+81 1 7 10 25 32 38
+82 2 15 17 25 37 40
+83 9 16 18 23 25 45
+84 2 3 15 21 27 45
+85 3 5 8 13 29 39
+86 5 11 20 22 27 41
+87 6 9 12 13 39 45
+88 3 18 21 28 37 38
+89 5 13 16 36 37 39
+90 4 15 16 24 30 46
+91 1 7 10 25 32 38
+92 2 15 17 25 37 40
+93 9 16 18 23 25 45
+94 2 3 15 21 27 45
+95 3 5 8 13 29 39
+96 5 11 20 22 27 41
+97 6 9 12 13 39 45
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+99 5 13 16 36 37 39
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diff --git a/Math/Lottery/screenshot, 1.png b/Math/Lottery/screenshot, 1.png
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index 0000000..5595096
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diff --git a/Math/Lottery/screenshot, 3.png b/Math/Lottery/screenshot, 3.png
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diff --git a/Math/Multiplication trainer.bas b/Math/Multiplication trainer.bas
new file mode 100644
index 0000000..1be28bf
--- /dev/null
+++ b/Math/Multiplication trainer.bas	
@@ -0,0 +1,188 @@
+' Program to teach and test multiplication.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2000, Initial version
+' 2024, Improved program readability
+
+DECLARE SUB showGreetingAndSetup ()
+DEFINT A-Y
+DECLARE SUB getUserInputAndDisplayQuestions ()
+DIM SHARED userName$
+DIM SHARED numberOfQuestions
+
+showGreetingAndSetup
+getUserInputAndDisplayQuestions
+
+SUB getUserInputAndDisplayQuestions
+RANDOMIZE TIMER
+
+numberOfAttempts = 0
+incorrectAnswers = 0
+correctAnswers = 0
+PRINT "How much is:"
+4
+numberOfAttempts = numberOfAttempts + 1
+IF numberOfAttempts > numberOfQuestions THEN GOTO 6
+
+' Generate random numbers for multiplication
+multiplier1 = RND * 9
+multiplier2 = RND * 9
+question$ = STR$(multiplier1) + " X" + STR$(multiplier2)
+PRINT "    "
+PRINT question$
+
+5
+INPUT userAnswer$
+
+' Handle invalid inputs
+IF LEFT$(userAnswer$, 6) = "don't know" THEN
+    PRINT "Try at least !"
+    GOTO 5
+END IF
+
+' Convert input to number
+IF userAnswer$ = "0" THEN
+    userAnswer = 0
+    GOTO 10
+ELSE
+    userAnswer = VAL(userAnswer$)
+    IF userAnswer = 0 THEN userAnswer = -1
+END IF
+
+10
+
+' Check if the answer is correct
+IF multiplier1 * multiplier2 = userAnswer THEN
+    correctAnswers = correctAnswers + 1
+    PRINT "Correct !"
+ELSE
+    PRINT "Wrong !"
+    PRINT "Correct answer is ", multiplier1 * multiplier2
+    incorrectAnswers = incorrectAnswers + 1
+END IF
+
+GOTO 4
+
+6
+PRINT "-------------------------"
+COLOR 2
+PRINT "Incorrect answers: ", incorrectAnswers
+
+' Calculate the score
+scorePercentage = correctAnswers / numberOfQuestions * 100
+
+grade = 1
+
+' Determine the grade
+IF scorePercentage >= 25 THEN grade = 2
+IF scorePercentage >= 50 THEN grade = 3
+IF scorePercentage >= 70 THEN grade = 4
+IF scorePercentage >= 90 THEN grade = 5
+
+COLOR 14
+PRINT "Your grade is: "; grade
+END SUB
+
+DEFINT Z
+SUB showGreetingAndSetup
+
+' Clear the screen and set up graphics mode
+CLS
+SCREEN 13
+LOCATE 2, 1
+PRINT "     Math teaching program"
+
+' Draw a simple background pattern
+FOR y = 3 TO 20
+    FOR x = 0 TO 320
+        IF POINT(x, y) > 0 THEN
+            colorIndex = y + 56
+        ELSE
+            colorIndex = 31 - y / 2
+        END IF
+        PSET (x, y), colorIndex
+    NEXT x
+NEXT y
+
+' Get user input for their name
+LOCATE 5, 1
+COLOR 7
+INPUT "Enter your name ", userName$
+LOCATE 5, 1
+COLOR 8
+PRINT "Enter your name " + userName$
+
+' Greet the user
+LOCATE 6, 1
+COLOR 7
+PRINT "Hello " + userName$ + "!"
+
+8
+LOCATE 7, 1
+COLOR 8
+PRINT SPACE$(35)
+COLOR 7
+LOCATE 7, 1
+INPUT "How many questions would you like ? ", numberOfQuestions
+LOCATE 7, 1
+COLOR 8
+PRINT SPACE$(35)
+LOCATE 7, 1
+COLOR 8
+PRINT "How many questions would you like? " + STR$(numberOfQuestions)
+
+' Validate the number of questions
+IF numberOfQuestions < 5 THEN
+    PRINT "That would be too easy !"
+    GOTO 8
+END IF
+
+IF numberOfQuestions > 30 THEN
+    PRINT "That would be too hard !"
+    GOTO 8
+END IF
+
+PRINT "I will ask you some math questions."
+PRINT "Press any button when you are ready..."
+
+' Initialize color palette
+FOR a = 200 TO 230
+    OUT &H3C8, a
+    OUT &H3C9, a - 200
+    OUT &H3C9, 0
+    OUT &H3C9, 0
+NEXT
+
+' Initialize color array
+DIM colorArray(1 TO 32)
+
+currentColorIndex = 4
+colorChangeDirection = 1
+
+2
+FOR a = 0 TO 31
+    ' Draw vertical lines with decreasing brightness
+    LINE (a * 10, 170)-(a * 10 + 10, 190), 200 + colorArray(a + 1), BF
+    colorArray(a + 1) = colorArray(a + 1) - 1
+    IF colorArray(a + 1) < 0 THEN colorArray(a + 1) = 0
+NEXT a
+
+' Change the color index
+currentColorIndex = currentColorIndex + colorChangeDirection
+IF currentColorIndex > 30 OR currentColorIndex < 3 THEN colorChangeDirection = -colorChangeDirection
+colorArray(currentColorIndex) = 30
+SOUND 0, 1
+
+' Check if user is ready
+IF INKEY$ <> "" THEN GOTO 3
+GOTO 2
+
+3
+CLS
+END SUB
+
diff --git a/Math/Multiplication trainer.png b/Math/Multiplication trainer.png
new file mode 100644
index 0000000..7ea027a
Binary files /dev/null and b/Math/Multiplication trainer.png differ
diff --git a/Math/Plotting/2D graph plot.bas b/Math/Plotting/2D graph plot.bas
new file mode 100755
index 0000000..cc6d4ff
--- /dev/null
+++ b/Math/Plotting/2D graph plot.bas	
@@ -0,0 +1,85 @@
+' 2D Graph Plotter.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Created initial version
+' 2024.08, Updated for better readability and maintainability
+
+
+DECLARE SUB InitializeGraphicsEnvironment ()
+DECLARE SUB PlotPoint (x1 AS SINGLE, y1 AS SINGLE, x2 AS SINGLE, y2 AS SINGLE, colorCode AS INTEGER)
+
+' Scaling factor for the graph
+DIM SHARED scaleFactor AS INTEGER
+scaleFactor = 100
+
+' Initialize the graphics environment
+InitializeGraphicsEnvironment
+
+' Set the origin of the graph
+DIM originX AS SINGLE
+DIM originY AS SINGLE
+originX = -320 / scaleFactor
+originY = 0
+
+' Loop to plot each point on the graph based on the formula
+DIM currentX AS SINGLE
+DIM currentY AS SINGLE
+FOR currentX = -320 / scaleFactor TO 320 / scaleFactor STEP 1 / scaleFactor
+    ' Function to calculate y-value based on x-value
+    currentY = 1 - (COS(currentX * 2)) + (SIN(currentX * 2))   ' User-defined formula
+
+    ' Plot the point and update the origin for the next segment
+    PlotPoint currentX, currentY, originX, originY, 14
+    originX = currentX
+    originY = currentY
+NEXT currentX
+
+' Subroutine to initialize the graphics window and grid
+SUB InitializeGraphicsEnvironment
+    SCREEN 12
+
+    ' Draw horizontal grid lines
+    DIM horizontalGridStep AS SINGLE
+    FOR horizontalGridStep = -320 TO 320
+        IF horizontalGridStep / scaleFactor = horizontalGridStep \ scaleFactor THEN
+            LINE (horizontalGridStep + 320, 0)-(horizontalGridStep + 320, 479), 1
+        END IF
+    NEXT horizontalGridStep
+
+    ' Draw vertical grid lines
+    DIM verticalGridStep AS SINGLE
+    FOR verticalGridStep = -240 TO 240
+        IF verticalGridStep / scaleFactor = verticalGridStep \ scaleFactor THEN
+            LINE (0, verticalGridStep + 240)-(639, verticalGridStep + 240), 1
+        END IF
+    NEXT verticalGridStep
+
+    ' Draw the central axis lines
+    LINE (0, 240)-(639, 240), 3
+    LINE (320, 0)-(320, 479), 3
+END SUB
+
+' Subroutine to plot a point on the graph
+SUB PlotPoint (x AS SINGLE, y AS SINGLE, x1 AS SINGLE, y1 AS SINGLE, colorCode AS INTEGER)
+    ' Convert graph coordinates to screen pixel coordinates
+    DIM screenX1 AS INTEGER
+    DIM screenY1 AS INTEGER
+    DIM screenX2 AS INTEGER
+    DIM screenY2 AS INTEGER
+
+    screenX1 = (x * scaleFactor) + 320
+    screenY1 = 240 - (y * scaleFactor)
+    screenX2 = (x1 * scaleFactor) + 320
+    screenY2 = 240 - (y1 * scaleFactor)
+
+    ' Check if the point is within the screen boundaries before plotting
+    IF screenX1 >= 0 AND screenY1 >= 0 AND screenX1 <= 639 AND screenY1 <= 479 AND screenX2 >= 0 AND screenY2 >= 0 AND screenX2 <= 639 AND screenY2 <= 479 THEN
+        LINE (screenX1, screenY1)-(screenX2, screenY2), colorCode
+    END IF
+END SUB
+
diff --git a/Math/Plotting/2D graph plot.png b/Math/Plotting/2D graph plot.png
new file mode 100644
index 0000000..ad022d9
Binary files /dev/null and b/Math/Plotting/2D graph plot.png differ
diff --git a/Math/Plotting/3D graph.bas b/Math/Plotting/3D graph.bas
new file mode 100644
index 0000000..105d4a4
--- /dev/null
+++ b/Math/Plotting/3D graph.bas	
@@ -0,0 +1,427 @@
+DECLARE SUB formula (x!, y!, z!)
+DECLARE SUB graaf ()
+DECLARE SUB mkgr3 (x1!, y1!, z1!)
+DECLARE SUB mkgr2 (x1!, y1!, z1!)
+DECLARE SUB mkgr (x1!, y1!, z1!)
+DECLARE SUB start ()
+DECLARE SUB getcor ()
+DECLARE SUB nait3d ()
+' 3D heightmap explorer. Allows to visualize heightmap for arbitrary function.
+' Inspect and edit function "formula" to visualize alternative mathematical functions.
+
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2002, Initial version
+' 2024.09, Improved program readability
+
+' Keyboard controls:
+' Cursor keys - move around
+' -           - fly up
+' +           - fly down
+' ESC         - exit program
+
+' Type your formula to sub module "formula".
+' X & Y are surface coordinates. Z must be formula
+' result, indicating height. "tm" variable counts
+' frames. Use it in your formula to make graph moving in time.
+
+DIM SHARED vertexX(4000), vertexY(4000), vertexZ(4000)
+DIM SHARED x(4000), y(4000), z(4000)
+
+DIM SHARED xo(4000), yo(4000), zo(4000)
+DIM SHARED linePoint1(4000), linePoint2(4000)
+DIM SHARED lineColor(4000)
+DIM SHARED vertexCount, lineCount
+DIM SHARED tmvertexCount, tmlineCount, tm
+DIM SHARED myx, myy, myz, mye, myk
+
+myx = 520
+myy = -250
+myz = -1000
+tm = 0
+
+ON ERROR GOTO 3
+start
+
+nait3d
+
+3
+PRINT "Kuskil programmis l�ks mingi arv �le lubatud piiride!!!"
+RESUME
+
+' This subroutine initializes the coordinate system and sets up the grid.
+SUB getcor
+    c = 12
+
+    ' Create background 2D grids along every axis in 3D space
+    ' to help viewer perceive scale.
+    mkgr -500, 0, 0
+    mkgr2 0, 0, 500
+    mkgr3 0, -500, 0
+
+    ' Place center-crossing pink lines across every axis (3D cross).
+    ' This is to help viewer to see where zero point on the graph is.
+
+    ' Add vertices for the 3D cross.
+    vertexX(vertexCount + 1) = 0
+    vertexY(vertexCount + 1) = -500
+    vertexZ(vertexCount + 1) = 0
+
+    vertexX(vertexCount + 2) = 0
+    vertexY(vertexCount + 2) = 500
+    vertexZ(vertexCount + 2) = 0
+
+    vertexX(vertexCount + 3) = -500
+    vertexY(vertexCount + 3) = 0
+    vertexZ(vertexCount + 3) = 0
+
+    vertexX(vertexCount + 4) = 500
+    vertexY(vertexCount + 4) = 0
+    vertexZ(vertexCount + 4) = 0
+
+    vertexX(vertexCount + 5) = 0
+    vertexY(vertexCount + 5) = 0
+    vertexZ(vertexCount + 5) = -500
+
+    vertexX(vertexCount + 6) = 0
+    vertexY(vertexCount + 6) = 0
+    vertexZ(vertexCount + 6) = 500
+
+    ' Add lines for the 3D cross.
+    linePoint1(lineCount + 1) = vertexCount + 1
+    linePoint2(lineCount + 1) = vertexCount + 2
+    lineColor(lineCount + 1) = c
+
+    linePoint1(lineCount + 2) = vertexCount + 3
+    linePoint2(lineCount + 2) = vertexCount + 4
+    lineColor(lineCount + 2) = c
+
+    linePoint1(lineCount + 3) = vertexCount + 5
+    linePoint2(lineCount + 3) = vertexCount + 6
+    lineColor(lineCount + 3) = c
+
+    ' Update the vertex and line counts
+    vertexCount = vertexCount + 6
+    lineCount = lineCount + 3
+    tmvertexCount = vertexCount
+    tmlineCount = lineCount
+END SUB
+
+' This subroutine generates a grid of points based on the formula
+SUB graaf
+    c = 14
+
+    d = 0
+    e = 0
+    FOR x = -500 TO 500 STEP 50
+        FOR z = -500 TO 500 STEP 50
+
+            ' Increment the vertex count and add a new vertex
+            d = d + 1
+            vertexX(vertexCount + d) = x
+            formula x / 50, z / 50, y   ' evaluate formula that we want to visualize
+            vertexY(vertexCount + d) = y * 50
+            vertexZ(vertexCount + d) = z
+
+            ' Connect current point on the grid with neighbors
+            IF z > -500 THEN
+                e = e + 1
+                linePoint1(lineCount + e) = vertexCount + d
+                linePoint2(lineCount + e) = vertexCount + d - 1
+                lineColor(lineCount + e) = c
+            END IF
+
+            IF x > -500 THEN
+                e = e + 1
+                linePoint1(lineCount + e) = vertexCount + d
+                linePoint2(lineCount + e) = vertexCount + d - 21
+                lineColor(lineCount + e) = c
+            END IF
+
+        NEXT z
+    NEXT x
+
+    ' Update the vertex and line counts
+    vertexCount = vertexCount + d
+    lineCount = lineCount + e
+END SUB
+
+' This subroutine generates a measuring grid in the ZY plane.
+SUB mkgr (x1, y1, z1)
+    c = 3
+
+    d = 0
+    e = 0
+    FOR z = -500 TO 500 STEP 100
+        FOR y = -500 TO 500 STEP 100
+
+            ' Increment the vertex count and add a new vertex
+            d = d + 1
+            vertexX(vertexCount + d) = x1
+            vertexY(vertexCount + d) = y1 + y
+            vertexZ(vertexCount + d) = z1 + z
+
+            ' Add lines to the line array if necessary
+            IF y > -500 THEN
+                e = e + 1
+                linePoint1(lineCount + e) = vertexCount + d
+                linePoint2(lineCount + e) = vertexCount + d - 1
+                lineColor(lineCount + e) = c
+            END IF
+
+            IF z > -500 THEN
+                e = e + 1
+                linePoint1(lineCount + e) = vertexCount + d
+                linePoint2(lineCount + e) = vertexCount + d - 11
+                lineColor(lineCount + e) = c
+            END IF
+
+        NEXT y
+    NEXT z
+
+    ' Update the vertex and line counts
+    vertexCount = vertexCount + d
+    lineCount = lineCount + e
+END SUB
+
+' This subroutine generates a measuring grid XY plane.
+SUB mkgr2 (x1, y1, z1)
+    c = 3
+
+    d = 0
+    e = 0
+    FOR x = -500 TO 500 STEP 100
+        FOR y = -500 TO 500 STEP 100
+
+            ' Increment the vertex count and add a new vertex
+            d = d + 1
+            vertexX(vertexCount + d) = x1 + x
+            vertexY(vertexCount + d) = y1 + y
+            vertexZ(vertexCount + d) = z1
+
+            ' Add lines to the line array if necessary
+            IF y > -500 THEN
+                e = e + 1
+                linePoint1(lineCount + e) = vertexCount + d
+                linePoint2(lineCount + e) = vertexCount + d - 1
+                lineColor(lineCount + e) = c
+            END IF
+
+            IF x > -500 THEN
+                e = e + 1
+                linePoint1(lineCount + e) = vertexCount + d
+                linePoint2(lineCount + e) = vertexCount + d - 11
+                lineColor(lineCount + e) = c
+            END IF
+
+        NEXT y
+    NEXT x
+
+    ' Update the vertex and line counts
+    vertexCount = vertexCount + d
+    lineCount = lineCount + e
+END SUB
+
+' This subroutine generates a measuring grid in the XZ plane.
+SUB mkgr3 (x1, y1, z1)
+    c = 3
+
+    d = 0
+    e = 0
+    FOR x = -500 TO 500 STEP 100
+        FOR z = -500 TO 500 STEP 100
+
+            ' Increment the vertex count and add a new vertex
+            d = d + 1
+            vertexX(vertexCount + d) = x1 + x
+            vertexY(vertexCount + d) = y1
+            vertexZ(vertexCount + d) = z
+
+            ' Add lines to the line array if necessary
+            IF z > -500 THEN
+                e = e + 1
+                linePoint1(lineCount + e) = vertexCount + d
+                linePoint2(lineCount + e) = vertexCount + d - 1
+                lineColor(lineCount + e) = c
+            END IF
+
+            IF x > -500 THEN
+                e = e + 1
+                linePoint1(lineCount + e) = vertexCount + d
+                linePoint2(lineCount + e) = vertexCount + d - 11
+                lineColor(lineCount + e) = c
+            END IF
+
+        NEXT z
+    NEXT x
+
+    ' Update the vertex and line counts
+    vertexCount = vertexCount + d
+    lineCount = lineCount + e
+END SUB
+
+' This subroutine renders the 3D scene.
+SUB nait3d
+
+1
+vertexCount = tmvertexCount
+lineCount = tmlineCount
+tm = tm + 1
+graaf
+
+myx = myx + SIN(deg1) * mye
+myz = myz + COS(deg1) * mye
+
+myx = myx + COS(deg1) * myk
+myz = myz - SIN(deg1) * myk
+
+myy = myy + myyp
+
+deg1 = deg1 + d1
+Deg2 = Deg2 + d2
+
+C1 = COS(deg1): S1 = SIN(deg1)
+C2 = COS(Deg2): S2 = SIN(Deg2)
+
+' Transform the vertices to 3D space
+FOR a = 1 TO vertexCount
+
+    xo = vertexX(a) - myx
+    yo = -vertexY(a) - myy
+    zo = vertexZ(a) - myz
+
+    ' Apply rotation transformations
+    x1 = (xo * C1 - zo * S1)
+    z1 = (xo * S1 + zo * C1)
+
+    y1 = (yo * C2 - z1 * S2)
+    z2 = (yo * S2 + z1 * C2)
+
+    ' Project the vertices onto the 2D screen
+    xo(a) = x(a)
+    yo(a) = y(a)
+
+    IF z2 < 20 THEN
+        x(a) = -1
+    ELSE
+        x(a) = 320 + (x1 / z2 * 500)
+        y(a) = 240 + (y1 / z2 * 500)
+    END IF
+NEXT
+
+' Draw the lines on the screen
+FOR a = 1 TO lineCount
+    p1 = linePoint1(a)
+    p2 = linePoint2(a)
+
+    ' Skip drawing if either point is off-screen
+    IF xo(p1) = -1 OR xo(p2) = -1 THEN
+        ' Do nothing
+    ELSE
+        ' erase line at previous position
+        LINE (xo(p1), yo(p1))-(xo(p2), yo(p2)), 0
+        ' draw line at new position
+        LINE (x(p1), y(p1))-(x(p2), y(p2)), lineColor(a)
+    END IF
+
+NEXT
+
+' Handle keyboard input
+K$ = INKEY$
+IF K$ <> "" THEN
+
+    SELECT CASE K$
+
+        CASE CHR$(0) + "P"
+            mye = mye - 3
+
+        CASE CHR$(0) + "H"
+            mye = mye + 3
+
+        CASE CHR$(0) + "M"
+            myk = myk + 3
+
+        CASE CHR$(0) + "K"
+            myk = myk - 3
+
+        CASE "+"
+            myyp = myyp + 5
+
+        CASE "-"
+            myyp = myyp - 5
+
+        CASE "6"
+            d1 = d1 + .01
+
+        CASE "4"
+            d1 = d1 - .01
+
+        CASE "8"
+            d2 = d2 - .01
+
+        CASE "2"
+            d2 = d2 + .01
+
+        CASE " "
+            d1 = d1 / 2
+            d2 = d2 / 2
+            d3 = d3 / 2
+            mye = mye / 2
+            myk = myk / 2
+            myyp = myyp / 2
+
+        CASE "q"
+            SYSTEM
+
+        CASE CHR$(27)
+            SYSTEM
+
+    END SELECT
+END IF
+
+GOTO 1
+END SUB
+
+' This subroutine initializes the graphics and sets up the program.
+SUB start
+SCREEN 12
+CLS
+
+FOR a = 1 TO 4000
+    lineColor(a) = 15
+NEXT a
+
+vertexCount = 0
+lineCount = 0
+
+getcor
+
+END SUB
+
+' This subroutine calculates the height of a point based on the formula
+SUB formula (x, y, z)
+z = 0
+v = SQR(x * x + y * y) ' v = distance from center, some formulas need it.
+
+' Apply the formula to calculate the height
+z = z + SIN(x + y) * SIN(tm / 10) ' diagonal lines
+z = z + (SQR((15 + v) * (15 - v)) - 10) ' top of the ball
+
+' As you see, multiple formulas can be enabled simultaneously.
+' Few more example formulas that you can uncomment and enable.
+' z = z + RND * 1                                ' noise
+' z = z + SIN((y + tm) / 2)                      ' forward moving wave
+' z = z + SIN(v / 2) * 2                         ' circular waves
+' z = z - SQR(v * 6)                             ' sharp peak
+' z = z + SIN(y / 1.5) / 1.5 + COS(x / 1.5) / 1.5' custom 1
+' z = z + SIN(y / 1.5) * COS(x / 1.5) / 1.5      ' custom 2
+' z = z + INT(SIN(1.5 * x * SIN(tm / 10))) * 3   ' custom 3
+' z = z - INT(v / 5) * 3 + 3                     ' custom 4
+' z = z + 3 * ((-INT((x - .3) / 20) * INT((23 + x - ABS(y * 1.2)) / 15)) + -INT(-y / 20) * -INT(-x / 20) * INT(-((x - 2) * (x - 2) + (y * 1.2 - 4) * (y * 1.2 - 4)) / 2000 + 1.01) + -INT(y / 20) * -INT(-x / 20) * INT(-((x - 2) * (x - 2) + (y * 1.2 + 4) * (y * 1.2 + 4)) / 2000 + 1.01)) ' heart
+
+END SUB
+
diff --git a/Math/Plotting/3D graph.png b/Math/Plotting/3D graph.png
new file mode 100644
index 0000000..a25dbb6
Binary files /dev/null and b/Math/Plotting/3D graph.png differ
diff --git a/Math/Plotting/Deriviative calculator.bas b/Math/Plotting/Deriviative calculator.bas
new file mode 100755
index 0000000..37b96e6
--- /dev/null
+++ b/Math/Plotting/Deriviative calculator.bas	
@@ -0,0 +1,87 @@
+' Program that computes and plots arbitrary mathematical function on a 2D graph.
+' Also it computes and plots the derivative of the function.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 200?, Initial version
+' 2024.09, Improved program readability
+
+
+DECLARE SUB Initialize ()
+DECLARE SUB PlotPoint (x, y, x1, y1, c!)
+DIM SHARED scaleFactor
+
+scaleFactor = 50        ' Scale factor for the graph
+Initialize
+
+oldX = -320 / scaleFactor
+oldY = 0
+
+FOR x = -320 / scaleFactor TO 320 / scaleFactor STEP 1 / scaleFactor
+
+    ' Calculate the function value (replace with your desired formula)
+    t = x ^ 3 - (3 * x)
+
+    PlotPoint x, t, oldX, prevY, 10
+    y = (t - prevY) * scaleFactor
+    prevY = t
+
+    PlotPoint x, y, oldX, oldY, 14
+    oldX = x
+    oldY = y
+NEXT x
+
+SUB Initialize
+    SCREEN 12
+
+    ' Draw vertical grid lines
+    FOR x = -320 TO 320
+        IF x / scaleFactor = x \ scaleFactor THEN LINE (x + 320, 0)-(x + 320, 479), 1
+    NEXT x
+
+    ' Draw horizontal grid lines
+    FOR y = -240 TO 240
+        IF y / scaleFactor = y \ scaleFactor THEN LINE (0, y + 240)-(639, y + 240), 1
+    NEXT y
+
+    ' Draw thicker vertical grid lines for every 5th unit
+    FOR x = -320 TO 320
+        IF x / (scaleFactor * 5) = x \ (scaleFactor * 5) THEN LINE (x + 320, 0)-(x + 320, 479), 4
+    NEXT x
+
+    ' Draw thicker horizontal grid lines for every 5th unit
+    FOR y = -240 TO 240
+        IF y / (scaleFactor * 5) = y \ (scaleFactor * 5) THEN LINE (0, y + 240)-(639, y + 240), 4
+    NEXT y
+
+    ' Draw x-axis and y-axis
+    LINE (0, 240)-(639, 240), 3
+    LINE (320, 0)-(320, 479), 3
+END SUB
+
+SUB PlotPoint (x, y, x1, y1, c)
+
+    x2 = (x * scaleFactor) + 320
+    y2 = 240 - (y * scaleFactor)
+    x3 = (x1 * scaleFactor) + 320
+    y3 = 240 - (y1 * scaleFactor)
+
+    ' Check if the points are within the screen boundaries
+    IF x2 < 0 THEN GOTO Skip
+    IF y2 < 0 THEN GOTO Skip
+    IF x2 > 639 THEN GOTO Skip
+    IF y2 > 479 THEN GOTO Skip
+    IF x3 < 0 THEN GOTO Skip
+    IF y3 < 0 THEN GOTO Skip
+    IF x3 > 639 THEN GOTO Skip
+    IF y3 > 479 THEN GOTO Skip
+
+    ' Draw a line between the two points with the specified color
+    LINE (x2, y2)-(x3, y3), c
+
+Skip:
+END SUB
diff --git a/Math/Plotting/Deriviative calculator.png b/Math/Plotting/Deriviative calculator.png
new file mode 100644
index 0000000..5c49948
Binary files /dev/null and b/Math/Plotting/Deriviative calculator.png differ
diff --git a/Math/Plotting/Sine and cosine table.bas b/Math/Plotting/Sine and cosine table.bas
new file mode 100755
index 0000000..c4202c7
--- /dev/null
+++ b/Math/Plotting/Sine and cosine table.bas	
@@ -0,0 +1,106 @@
+' SIN & COS table generator
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version.
+' 2024.08, Updated code readability.
+
+
+' Screen dimensions and video mode settings
+screenWidth = 640
+screenHeight = 480
+videoMode = 12 ' Video mode switch (0 for text mode, non-zero for graphics mode)
+stringSize = 0 ' String size for text mode
+
+' Adjust screen dimensions for a more accurate representation
+screenWidth = screenWidth / 11.3
+screenHeight = screenHeight / 11.7
+
+' Determine string size based on video mode
+IF stringSize = 0 THEN
+    SELECT CASE videoMode
+        CASE 12, 11
+            stringSize = 16
+
+        CASE 9, 10
+            stringSize = 14
+
+        CASE 1, 13, 2, 7, 8
+            stringSize = 8
+    END SELECT
+ELSE
+    GOTO InitializeScreen
+END IF
+
+InitializeScreen:
+SCREEN videoMode
+
+' Draw grid and label axes
+FOR gridLine = 1 TO 10
+    ' Draw horizontal grid lines
+    LINE (0, gridLine * screenHeight)-(screenWidth * 10, gridLine * screenHeight), 8
+
+    ' Draw vertical grid lines
+    LINE (gridLine * screenWidth, 0)-(gridLine * screenWidth, screenHeight * 10), 8
+
+    ' Label horizontal axis with numbers
+    textRow = 10 * screenHeight / stringSize + 2
+    textCol = gridLine * screenWidth / 8 + 1
+    LOCATE textRow, textCol
+    PRINT CHR$(gridLine + 48);
+NEXT gridLine
+
+' Label the end of the horizontal axis
+LOCATE 10 * screenHeight / stringSize + 2, screenWidth * 10 / 8
+PRINT "10";
+
+' Label special points on the vertical axis
+LOCATE 1 * screenHeight / stringSize + 1, screenWidth * 10 / 8 + 3
+PRINT "-1";
+LOCATE 5 * screenHeight / stringSize + 1, screenWidth * 10 / 8 + 3
+PRINT "0";
+LOCATE 10 * screenHeight / stringSize, screenWidth * 10 / 8 + 3
+PRINT "1";
+
+' Draw central horizontal and vertical lines
+LINE (0, screenHeight * 5 + 1)-(screenWidth * 10, screenHeight * 5 + 1), 14
+LINE (5 * screenWidth + 1, 0)-(5 * screenWidth + 1, 10 * screenHeight), 14
+
+' Plot SIN function
+FOR angle = 0 TO 10 STEP .05
+    xPosition = angle * screenWidth
+    yPosition = SIN(angle) * screenHeight * 5 + screenHeight * 5
+    IF angle > 0 THEN LINE (xPositionPrev, yPositionPrev)-(xPosition, yPosition), 15
+    xPositionPrev = xPosition
+    yPositionPrev = yPosition
+NEXT angle
+
+' Label the SIN curve
+textRow = yPosition / stringSize + 1
+textCol = screenWidth * 10 / 8
+LOCATE textRow, textCol
+PRINT "sin";
+
+' Plot COS function
+FOR angle = 0 TO 10 STEP .05
+    xPosition = angle * screenWidth
+    yPosition = COS(angle) * screenHeight * 5 + screenHeight * 5
+    IF angle > 0 THEN LINE (xPositionPrev, yPositionPrev)-(xPosition, yPosition), 12
+    xPositionPrev = xPosition
+    yPositionPrev = yPosition
+NEXT angle
+
+' Label the COS curve
+textRow = yPosition / stringSize + 1
+textCol = screenWidth * 10 / 8
+LOCATE textRow, textCol
+PRINT "cos";
+
+' Wait for user input before exiting
+a$ = INPUT$(1)
+SYSTEM
+
diff --git a/Math/Plotting/Sine and cosine table.png b/Math/Plotting/Sine and cosine table.png
new file mode 100644
index 0000000..e717cfa
Binary files /dev/null and b/Math/Plotting/Sine and cosine table.png differ
diff --git a/Math/Simulation/Explosion/Explosion simulator.bas b/Math/Simulation/Explosion/Explosion simulator.bas
new file mode 100755
index 0000000..73fe672
--- /dev/null
+++ b/Math/Simulation/Explosion/Explosion simulator.bas	
@@ -0,0 +1,240 @@
+' Program to simulate shock waves propagation in gas.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003, Initial version
+' 2024 - 2025, Improved program readability
+
+DECLARE SUB SetLocalPressure(xCoord!, yCoord!, pressureValue!)
+DECLARE SUB DrawBoundaryLine(startX!, startY!, endX!, endY!)
+DIM SHARED wallBoundary
+wallBoundary = 9980 ' Special value indicating solid wall boundaries
+
+' Shared arrays for fluid simulation:
+DIM SHARED pressureGrid(1 TO 100, 1 TO 100) ' Stores pressure values at each grid point
+DIM SHARED horizontalVelocity(1 TO 100, 1 TO 100) ' Stores horizontal velocity components
+DIM SHARED verticalVelocity(1 TO 100, 1 TO 100) ' Stores vertical velocity components
+DIM SHARED horizontalPressureChange(1 TO 100, 1 TO 100) ' Stores x-direction pressure change at each grid point
+DIM SHARED verticalPressureChange(1 TO 100, 1 TO 100) ' Stores y-direction pressure change at each grid point
+
+SCREEN 13
+PAINT (1, 1), 1
+SetupInitialConditions
+
+1 ' Main simulation loop
+
+    ' Check if any key is pressed; if so, exit the program
+    IF INKEY$ <> "" THEN SYSTEM
+
+    ' Display pressure values in a grid at the bottom of the screen.
+    FOR gridY = 2 TO 99
+        FOR gridX = 2 TO 99
+            IF pressureGrid(gridX, gridY) = wallBoundary THEN
+                ' Set velocities to zero for wall boundaries
+                horizontalVelocity(gridX - 1, gridY) = 0
+                verticalVelocity(gridX, gridY - 1) = 0
+                horizontalVelocity(gridX, gridY) = 0
+                verticalVelocity(gridX, gridY) = 0
+                GOTO 3 ' Skip further calculations for this grid point if it's a wall
+            END IF
+
+            ' Apply gravitation by subtracting pressure from vertical speed
+            verticalVelocity(gridX, gridY) = verticalVelocity(gridX, gridY) - (pressureGrid(gridX, gridY) / 500)
+
+            IF pressureGrid(gridX + 1, gridY) = wallBoundary THEN
+                horizontalVelocity(gridX, gridY) = 0 ' Set horizontal speed to zero if there's a wall to the right
+                GOTO 2 ' Skip further calculations for this grid point if there's a wall to the right
+            END IF
+
+            ' Calculate x-direction speed based on pressure difference and previous speed
+            horizontalVelocity(gridX, gridY) = (pressureGrid(gridX + 1, gridY) - pressureGrid(gridX, gridY)) / 20 + horizontalVelocity(gridX, gridY)
+
+2 ' Label for skipping further calculations if there's a wall to the right
+            IF pressureGrid(gridX, gridY + 1) = wallBoundary THEN
+                verticalVelocity(gridX, gridY) = 0 ' Set vertical speed to zero if there's a wall below
+                GOTO 3 ' Skip further calculations for this grid point if there's a wall below
+            END IF
+
+            ' Calculate y-direction speed based on pressure difference and previous speed
+            verticalVelocity(gridX, gridY) = (pressureGrid(gridX, gridY + 1) - pressureGrid(gridX, gridY)) / 20 + verticalVelocity(gridX, gridY)
+
+3 ' Label for skipping further calculations if there's a wall below or above
+        NEXT gridX
+    NEXT gridY
+
+4 ' Negative pressure correction loop
+    negativePressureFlag = 0 ' Initialize negative pressure flag to zero
+    FOR gridY = 2 TO 99
+        FOR gridX = 2 TO 99
+            pressureDifference = pressureGrid(gridX, gridY) + horizontalVelocity(gridX, gridY) + verticalVelocity(gridX, gridY) - horizontalVelocity(gridX - 1, gridY) - verticalVelocity(gridX, gridY - 1)
+
+            IF pressureDifference = 0 OR ((pressureDifference < 0) AND (pressureDifference > -.0001)) THEN
+                ' If difference in pressure is zero or slightly negative, set speeds to zero
+                IF horizontalVelocity(gridX, gridY) < 0 THEN
+                    horizontalVelocity(gridX, gridY) = 0
+                END IF
+                IF verticalVelocity(gridX, gridY) < 0 THEN
+                    verticalVelocity(gridX, gridY) = 0
+                END IF
+                IF horizontalVelocity(gridX - 1, gridY) > 0 THEN
+                    horizontalVelocity(gridX - 1, gridY) = 0
+                END IF
+                IF verticalVelocity(gridX, gridY - 1) > 0 THEN
+                    verticalVelocity(gridX, gridY - 1) = 0
+                END IF
+            END IF
+
+            ' If pressure difference is negative
+            IF pressureDifference < 0 THEN
+                IF horizontalVelocity(gridX, gridY) < 0 THEN
+                    horizontalVelocity(gridX, gridY) = horizontalVelocity(gridX, gridY) / 1.5 ' Divide horizontal speed by 1.5 if negative
+                END IF
+                IF verticalVelocity(gridX, gridY) < 0 THEN
+                    verticalVelocity(gridX, gridY) = verticalVelocity(gridX, gridY) / 1.5 ' Divide vertical speed by 1.5 if negative
+                END IF
+                IF horizontalVelocity(gridX - 1, gridY) > 0 THEN
+                    horizontalVelocity(gridX - 1, gridY) = horizontalVelocity(gridX - 1, gridY) / 1.5 ' Divide horizontal speed by 1.5 if positive
+                END IF
+                IF verticalVelocity(gridX, gridY - 1) > 0 THEN
+                    verticalVelocity(gridX, gridY - 1) = verticalVelocity(gridX, gridY - 1) / 1.5 ' Divide vertical speed by 1.5 if positive
+                END IF
+                negativePressureFlag = 1 ' Set negative pressure flag to one
+                ' Display negative pressure value at the bottom of the screen
+                LOCATE 20, 1
+                PRINT pressureDifference
+            END IF
+        NEXT gridX
+    NEXT gridY
+
+    IF negativePressureFlag = 1 THEN GOTO 4 ' If negative pressure was detected, repeat this loop to correct speeds
+
+' Update pressure based on velocity
+FOR gridY = 2 TO 99
+    FOR gridX = 2 TO 99
+        ' Update pressure based on speed in the x-direction
+        IF horizontalVelocity(gridX, gridY) > 0 THEN
+            horizontalPressureChange(gridX - 1, gridY) = ((pressureGrid(gridX, gridY) * horizontalVelocity(gridX - 1, gridY)) + (horizontalVelocity(gridX, gridY) * horizontalVelocity(gridX, gridY))) / (pressureGrid(gridX, gridY) + horizontalVelocity(gridX, gridY)) - horizontalVelocity(gridX - 1, gridY)
+        END IF
+
+        ' Update pressure based on speed in the y-direction
+        IF verticalVelocity(gridX, gridY) > 0 THEN
+            verticalPressureChange(gridX, gridY - 1) = ((pressureGrid(gridX, gridY) * verticalVelocity(gridX, gridY - 1)) + (verticalVelocity(gridX, gridY) * verticalVelocity(gridX, gridY))) / (pressureGrid(gridX, gridY) + verticalVelocity(gridX, gridY)) - verticalVelocity(gridX, gridY - 1)
+        END IF
+
+        ' Handle negative speeds in the x-direction
+        IF horizontalVelocity(gridX - 1, gridY) < 0 THEN
+            horizontalPressureChange(gridX, gridY) = ((pressureGrid(gridX, gridY) * horizontalVelocity(gridX, gridY)) - (horizontalVelocity(gridX - 1, gridY) * horizontalVelocity(gridX - 1, gridY))) / (pressureGrid(gridX, gridY) - horizontalVelocity(gridX - 1, gridY)) - horizontalVelocity(gridX, gridY)
+        END IF
+
+        ' Handle negative speeds in the y-direction
+        IF verticalVelocity(gridX, gridY - 1) < 0 THEN
+            verticalPressureChange(gridX, gridY) = ((pressureGrid(gridX, gridY) * verticalVelocity(gridX, gridY)) - (verticalVelocity(gridX, gridY - 1) * verticalVelocity(gridX, gridY - 1))) / (pressureGrid(gridX, gridY) - verticalVelocity(gridX, gridY - 1)) - verticalVelocity(gridX, gridY)
+        END IF
+    NEXT gridX
+NEXT gridY
+
+' Update pressure grid based on velocities
+FOR gridY = 2 TO 99
+    FOR gridX = 2 TO 99
+        ' Update pressure based on speed in the x-direction
+        pressureGrid(gridX + 1, gridY) = pressureGrid(gridX + 1, gridY) - horizontalVelocity(gridX, gridY)
+
+        ' Update pressure based on speed in the y-direction
+        pressureGrid(gridX, gridY + 1) = pressureGrid(gridX, gridY + 1) - verticalVelocity(gridX, gridY)
+
+        ' Add x and y speeds to pressure
+        pressureGrid(gridX, gridY) = pressureGrid(gridX, gridY) + horizontalVelocity(gridX, gridY)
+        pressureGrid(gridX, gridY) = pressureGrid(gridX, gridY) + verticalVelocity(gridX, gridY)
+    NEXT gridX
+NEXT gridY
+
+' Update velocities based on pressure changes
+FOR gridY = 2 TO 99
+    FOR gridX = 2 TO 99
+        ' Update speed based on previous speed in the x-direction
+        horizontalVelocity(gridX, gridY) = horizontalVelocity(gridX, gridY) + horizontalPressureChange(gridX, gridY)
+
+        ' Reset pressure change to zero for next iteration
+        horizontalPressureChange(gridX, gridY) = 0
+
+        ' Update speed based on previous speed in the y-direction
+        verticalVelocity(gridX, gridY) = verticalVelocity(gridX, gridY) + verticalPressureChange(gridX, gridY)
+
+        ' Reset pressure change to zero for next iteration
+        verticalPressureChange(gridX, gridY) = 0
+    NEXT gridX
+NEXT gridY
+
+' Draw the grid based on pressure values
+FOR gridY = 1 TO 100
+    FOR gridX = 1 TO 100
+        ' Draw pixel based on pressure value
+        PSET (gridX, gridY), pressureGrid(gridX, gridY) + 16
+    NEXT gridX
+NEXT gridY
+
+GOTO 1 ' Repeat the main simulation loop
+
+SUB DrawBoundaryLine (startX!, startY!, endX!, endY!)
+    ' Draws a straight line between two points in the pressure grid
+    ' All points along the line are set to wallBoundary value
+    ' Uses linear interpolation for smooth line drawing
+    maxSteps = ABS(startX - endX)
+    IF ABS(startY - endY) > maxSteps THEN maxSteps = ABS(startY - endY)
+    deltaX = endX - startX
+    deltaY = endY - startY
+    FOR stepCount = 0 TO maxSteps
+        ' Calculate interpolated coordinates
+        interpX = deltaX * stepCount / maxSteps + startX
+        interpY = deltaY * stepCount / maxSteps + startY
+        ' Mark this point as a wall boundary
+        pressureGrid(interpX, interpY) = wallBoundary
+    NEXT stepCount
+END SUB
+
+SUB SetLocalPressure (xCoord!, yCoord!, pressureValue!)
+    ' Sets a 2x2 block of cells to specified pressure value
+    ' Creates localized pressure disturbances in simulation
+    pressureGrid(xCoord, yCoord) = pressureValue
+    pressureGrid(xCoord + 1, yCoord) = pressureValue
+    pressureGrid(xCoord, yCoord + 1) = pressureValue
+    pressureGrid(xCoord + 1, yCoord + 1) = pressureValue
+END SUB
+
+SUB SetupInitialConditions
+    ' Sets up initial conditions for the simulation:
+    ' - Initializes all pressure and velocity arrays
+    ' - Places initial pressure disturbances
+    ' - Creates boundary walls
+    FOR yIndex = 1 TO 100
+        FOR xIndex = 1 TO 100
+            ' Initialize pressure and velocity variables
+            pressureGrid(xIndex, yIndex) = 3
+            horizontalVelocity(xIndex, yIndex) = 0
+            verticalVelocity(xIndex, yIndex) = 0
+            horizontalPressureChange(xIndex, yIndex) = 0
+            verticalPressureChange(xIndex, yIndex) = 0
+        NEXT xIndex
+    NEXT yIndex
+
+    ' Create initial pressure spots
+    FOR yIndex = 30 TO 60
+        FOR xIndex = 10 TO 50
+            SetLocalPressure xIndex, yIndex, 30
+        NEXT xIndex
+    NEXT yIndex
+
+    ' Draw boundary lines
+    DrawBoundaryLine 2, 2, 2, 99
+    DrawBoundaryLine 99, 2, 99, 99
+    DrawBoundaryLine 2, 99, 99, 99
+    DrawBoundaryLine 2, 2, 99, 2
+
+    ' Draw additional lines for testing
+    FOR xIndex = 5 TO 40 STEP 5
+        DrawBoundaryLine xIndex, 80, xIndex + 50, 80 - xIndex
+    NEXT xIndex
+END SUB
diff --git a/Math/Simulation/Explosion/index.html b/Math/Simulation/Explosion/index.html
new file mode 100644
index 0000000..e0410d6
--- /dev/null
+++ b/Math/Simulation/Explosion/index.html
@@ -0,0 +1,17 @@
+<HTML>
+<HEAD><TITLE>explode</TITLE></HEAD>
+
+<BODY>
+
+<CENTER><H1>explode</H1></CENTER>
+<BR>
+<BR>
+<BR>Simulates air flow.
+Air tries to spread equally around space,
+while having is inertial farces, mass and gravitation.
+Simulation animates shock waves propagation on
+flat space after explosion.
+
+<BR><IMG SRC="sshot.png">
+</BODY>
+</HTML>
\ No newline at end of file
diff --git a/Math/Simulation/Explosion/screenshot.png b/Math/Simulation/Explosion/screenshot.png
new file mode 100644
index 0000000..80089b6
Binary files /dev/null and b/Math/Simulation/Explosion/screenshot.png differ
diff --git a/Math/Simulation/Gravity in 2D.bas b/Math/Simulation/Gravity in 2D.bas
new file mode 100755
index 0000000..3bebaeb
--- /dev/null
+++ b/Math/Simulation/Gravity in 2D.bas	
@@ -0,0 +1,59 @@
+' Gravitation Simulation
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' This program simulates the gravitational pull of a central mass
+' on a small object in two-dimensional space. The simulation is
+' visualized on the screen with the central mass as a large circle
+' and the orbiting object as a smaller circle.
+'
+' Changelog:
+' 2001,    Initial version
+' 2024 - 2025, Improved code readability
+
+DEFDBL A-Z  ' Declare all variables as double precision for accuracy
+SCREEN 12    ' Set the graphics mode to 640x480 resolution, 16 colors
+
+' Initialize position and velocity of the orbiting object
+objX = -200    ' X-coordinate of the object
+objY = 0       ' Y-coordinate of the object
+objVelX = -1   ' X-velocity (speed) of the object
+objVelY = 3     ' Y-velocity (speed) of the object
+
+' Draw the central mass as a large circle
+CIRCLE (320, 240), 100, 3
+
+' Main simulation loop
+DO
+
+    ' Check for user input and exit if any key is pressed
+    IF INKEY$ <> "" THEN SYSTEM
+
+    ' Draw a small circle to represent the orbiting object
+    CIRCLE (objX + 320, objY + 240), 2, 14
+
+    ' Update the position of the orbiting object
+    objX = objX + objVelX
+    objY = objY + objVelY
+
+    ' Calculate the distance from the central mass
+    dist = SQR(objX * objX + objY * objY)
+
+    ' Calculate the gravitational acceleration towards the center
+    gravAccel = 20 / dist   ' Gravitational constant for this simulation
+
+    ' Adjust velocities based on gravitational pull and distance
+    objVelX = objVelX + (gravAccel * (-objX) / dist)
+    objVelY = objVelY + (gravAccel * (-objY) / dist)
+
+    ' Draw a line to show the object's trajectory
+    LINE (objX + 320, objY + 240)-(320, 240), 1
+   
+   
+    SOUND 0, .1
+
+LOOP
+
diff --git a/Math/Simulation/Gravity in 2D.png b/Math/Simulation/Gravity in 2D.png
new file mode 100644
index 0000000..51de6bf
Binary files /dev/null and b/Math/Simulation/Gravity in 2D.png differ
diff --git a/Math/Simulation/Gravity in 3D.bas b/Math/Simulation/Gravity in 3D.bas
new file mode 100755
index 0000000..0efdb9d
--- /dev/null
+++ b/Math/Simulation/Gravity in 3D.bas	
@@ -0,0 +1,129 @@
+' Program to simulate gravitational forces between atoms.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024.08, Improved program readability
+
+DECLARE SUB Gravitate ()
+DECLARE SUB AddAtom (x AS SINGLE, y AS SINGLE, z AS SINGLE, size AS SINGLE)
+DECLARE SUB DisplaySystem ()
+
+DIM SHARED atomX(1 TO 100)
+DIM SHARED atomY(1 TO 100)
+DIM SHARED atomZ(1 TO 100)
+DIM SHARED atomXSpeed(1 TO 100)
+DIM SHARED atomYSpeed(1 TO 100)
+DIM SHARED atomZSpeed(1 TO 100)
+DIM SHARED atomSize(1 TO 100)
+DIM SHARED countOfAtoms
+DIM SHARED myX, myY, myZ
+DIM SHARED oldAtomX(1 TO 100)
+DIM SHARED oldAtomY(1 TO 100)
+DIM SHARED oldAtomSize(1 TO 100)
+
+myX = 0
+myY = 0
+myZ = -5
+countOfAtoms = 0
+
+SCREEN 13
+
+' Initialize the system with a random distribution of atoms
+FOR a = 1 TO 30
+    AddAtom RND * 6 - 3, RND * 6 - 3, RND * 4, 50
+NEXT a
+
+' Main loop to display and update the system
+1
+    DisplaySystem
+    Gravitate
+    IF INKEY$ <> "" THEN SYSTEM ' Exit on any key press
+   
+    ' Delay animation
+    SOUND 0, 1
+GOTO 1
+
+SUB AddAtom (x, y, z, size)
+    ' Increment the atom count
+    countOfAtoms = countOfAtoms + 1
+
+    ' Store the new atom's position and size
+    atomX(countOfAtoms) = x
+    atomY(countOfAtoms) = y
+    atomZ(countOfAtoms) = z
+    atomSize(countOfAtoms) = size
+
+    ' Initialize the speed of the new atom to zero
+    atomXSpeed(countOfAtoms) = 0
+    atomYSpeed(countOfAtoms) = 0
+    atomZSpeed(countOfAtoms) = 0
+END SUB
+
+SUB DisplaySystem
+    FOR a = 1 TO countOfAtoms
+        ' Calculate the relative position of each atom
+        x = atomX(a) - myX
+        y = atomY(a) - myY
+        z = atomZ(a) - myZ
+
+        ' Project the 3D positions onto a 2D screen
+        x1 = x / z * 100 + 160
+        y1 = y / z * 100 + 100
+
+        ' Erase the old atom position and draw the new one
+        CIRCLE (oldAtomX(a), oldAtomY(a)), oldAtomSize(a), 0
+        CIRCLE (x1, y1), atomSize(a) / z, 15
+
+        ' Update the old positions for the next frame
+        oldAtomX(a) = x1
+        oldAtomY(a) = y1
+        oldAtomSize(a) = atomSize(a) / z
+    NEXT a
+END SUB
+
+SUB Gravitate
+    DIM pxs, pys, pzs
+
+    FOR a = 1 TO countOfAtoms
+        ' Get the current atom's position
+        x = atomX(a)
+        y = atomY(a)
+        z = atomZ(a)
+
+        ' Initialize gravitational forces to zero
+        pxs = 0
+        pys = 0
+        pzs = 0
+
+        FOR b = 1 TO countOfAtoms
+            IF b = a THEN GOTO 2 ' Skip self-gravitation
+
+            ' Calculate the distance between atoms
+            v = SQR((atomX(b) - x) ^ 2 + (atomY(b) - y) ^ 2 + (atomZ(b) - z) ^ 2)
+            v2 = 1 / (v - 1)
+
+            ' Accumulate gravitational forces from other atoms
+            pxs = pxs + (atomX(b) - x) / v2 / 10000
+            pys = pys + (atomY(b) - y) / v2 / 10000
+            pzs = pzs + (atomZ(b) - z) / v2 / 10000
+
+2          NEXT b
+
+        ' Update the atom's velocity with the accumulated forces
+        atomXSpeed(a) = atomXSpeed(a) / 1.01 + pxs
+        atomYSpeed(a) = atomYSpeed(a) / 1.01 + pys
+        atomZSpeed(a) = atomZSpeed(a) / 1.01 + pzs
+    NEXT a
+
+    ' Update the positions of all atoms based on their velocities
+    FOR a = 1 TO countOfAtoms
+        atomX(a) = atomX(a) + atomXSpeed(a)
+        atomY(a) = atomY(a) + atomYSpeed(a)
+        atomZ(a) = atomZ(a) + atomZSpeed(a)
+    NEXT a
+END SUB
+
diff --git a/Math/Simulation/Gravity in 3D.webm b/Math/Simulation/Gravity in 3D.webm
new file mode 100644
index 0000000..c941ab8
Binary files /dev/null and b/Math/Simulation/Gravity in 3D.webm differ
diff --git a/Math/Simulation/Interference.BAS b/Math/Simulation/Interference.BAS
new file mode 100755
index 0000000..6252cf5
--- /dev/null
+++ b/Math/Simulation/Interference.BAS
@@ -0,0 +1,51 @@
+' Program simulates interference between two slightly different frequencies
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' ?, Initial version
+' 2024-2025, Improved program readability
+
+DECLARE SUB GetFrequency ()
+DECLARE SUB Start ()
+DECLARE FUNCTION GetY! (t!)
+
+SCREEN 12
+1
+
+' Check for user input and exit if any key is pressed
+IF INKEY$ <> "" THEN SYSTEM
+
+frame = frame + 1
+FOR x = 0 TO 639
+
+    oldY1 = y1
+    oldY2 = y2
+    oldY3 = y3
+
+    ' Calculate new Y values for the waves
+    ' First wave: simple sine wave
+    y1 = SIN(frame + x / 4) * 20 + 150
+
+    ' Second wave: same but with additional phase shift that increases with x
+    ' This creates a slight frequency difference
+    y2 = SIN(frame + x / 4 + (x / 50)) * 20 + 150
+
+    ' Third line: sum of both waves to show interference pattern
+    y3 = y1 + y2
+
+    ' Clear the previous frame by drawing black vertical line
+    LINE (x, 0)-(x, 479), 0
+
+    ' Draw new lines for each wave
+    LINE (x - 1, oldY1)-(x, y1), 1   ' Blue wave
+    LINE (x - 1, oldY2)-(x, y2), 2   ' Green wave
+    LINE (x - 1, oldY3)-(x, y3), 15  ' White combined wave
+
+NEXT x
+GOTO 1
+
+
diff --git a/Math/Simulation/Interference.webm b/Math/Simulation/Interference.webm
new file mode 100644
index 0000000..2b2b15d
Binary files /dev/null and b/Math/Simulation/Interference.webm differ
diff --git a/Math/Simulation/Interferogram.BAS b/Math/Simulation/Interferogram.BAS
new file mode 100755
index 0000000..1378bf9
--- /dev/null
+++ b/Math/Simulation/Interferogram.BAS
@@ -0,0 +1,52 @@
+' Program simulates lot of frequencies interfering with itself.
+' As a result, interferogram is produced.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' ?, Initial version
+' 2024 - 2025, Improved program readability
+
+' Set graphics mode (640x480 with 16 colors)
+SCREEN 12
+
+' Start drawing from the leftmost pixel
+PSET (0, 0)
+
+' Loop through all horizontal positions on screen
+FOR currentXPosition = 0 TO 639
+
+    ' Calculate frequency scaling factor based on position
+    ' This creates a gradient effect in the interference pattern
+    frequencyScalingFactor = (currentXPosition - 320) / 5000 + 1
+
+    ' Initialize accumulated signal value
+    totalSignalValue = 0
+
+    ' Sample the signal at multiple time steps to calculate interference
+    FOR currentTimeStep = 1 TO 5000 STEP 5
+        ' Generate two sine waves:
+        ' y1 - base frequency wave
+        ' y2 - frequency scaled wave (based on horizontal position)
+        baseWave = SIN(currentTimeStep)
+        scaledWave = SIN(currentTimeStep * frequencyScalingFactor)
+
+        ' Calculate interference by summing the waves and taking absolute value
+        totalSignalValue = totalSignalValue + ABS(baseWave + scaledWave)
+    NEXT currentTimeStep
+
+    ' Normalize the signal value
+    normalizedSignalValue = totalSignalValue / 5
+
+    ' Limit the value to screen boundaries
+    IF normalizedSignalValue > 470 THEN normalizedSignalValue = 470
+    IF normalizedSignalValue < 0 THEN normalizedSignalValue = 0
+
+    ' Draw a line from previous position to current position
+    LINE -(currentXPosition, 479 - normalizedSignalValue), 15
+
+NEXT currentXPosition
+
diff --git a/Math/Simulation/Interferogram.png b/Math/Simulation/Interferogram.png
new file mode 100644
index 0000000..b433b07
Binary files /dev/null and b/Math/Simulation/Interferogram.png differ
diff --git a/Math/Simulation/Surface tension.bas b/Math/Simulation/Surface tension.bas
new file mode 100755
index 0000000..096acaa
--- /dev/null
+++ b/Math/Simulation/Surface tension.bas	
@@ -0,0 +1,101 @@
+' Program simulates water spill and subsequent surface tension effects
+' that try to round out sharp edges through cellular automata rules.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024 - 2025, Improved program readability
+
+DEFINT A-Z
+WIDTH 80, 50
+VIEW PRINT 1 TO 50
+RANDOMIZE TIMER
+CLS
+
+' Create two grids for double buffering technique
+' This prevents visual artifacts during updates
+DIM SHARED currentGrid(1 TO 80, 1 TO 50)
+DIM SHARED nextGrid(1 TO 80, 1 TO 50)
+
+' Initialize grid with random water (1) and empty space (0)
+FOR row = 1 TO 50
+    FOR column = 1 TO 80
+        currentGrid(column, row) = INT(RND * 2)
+    NEXT column
+NEXT row
+
+'================================================================================
+' MAIN SIMULATION LOOP
+' Continuously calculates next state based on surface tension rules
+' Uses cellular automata approach with Moore neighborhood (8 neighbors)
+'================================================================================
+1
+
+' Check for user input and exit if any key is pressed
+IF INKEY$ <> "" THEN SYSTEM
+
+FOR row = 2 TO 49
+    FOR column = 2 TO 79
+        ' Count live cells around current position (Moore neighborhood)
+        ' This includes all 8 surrounding cells forming a square around it
+        neighborTotal = currentGrid(column - 1, row - 1)
+        neighborTotal = neighborTotal + currentGrid(column, row - 1)
+        neighborTotal = neighborTotal + currentGrid(column + 1, row - 1)
+        neighborTotal = neighborTotal + currentGrid(column - 1, row)
+        neighborTotal = neighborTotal + currentGrid(column + 1, row)
+        neighborTotal = neighborTotal + currentGrid(column - 1, row + 1)
+        neighborTotal = neighborTotal + currentGrid(column, row + 1)
+        neighborTotal = neighborTotal + currentGrid(column + 1, row + 1)
+
+        ' Apply surface tension rules:
+        ' 1. Water cell (value 1) survives only if surrounded by moderate density
+        ' 2. Empty space (value 0) becomes water if surrounded by high density
+        IF currentGrid(column, row) = 1 THEN
+            IF neighborTotal > 3 THEN
+                nextGrid(column, row) = 1
+            ELSE
+                nextGrid(column, row) = 0
+            END IF
+        ELSE
+            IF neighborTotal > 4 THEN
+                nextGrid(column, row) = 1
+            ELSE
+                nextGrid(column, row) = 0
+            END IF
+        END IF
+    NEXT column
+NEXT row
+
+' UPDATE DISPLAY AND SWAP BUFFERS
+' Renders the simulation state to screen using ASCII characters and prepares
+' for next iteration by swapping active/inactive grids
+FOR row = 1 TO 50
+    FOR column = 1 TO 80
+        ' Transfer calculated state from working buffer to display buffer
+        cellState = nextGrid(column, row)
+        currentGrid(column, row) = cellState
+
+        ' Visual representation: # for water, . for empty space
+        LOCATE row, column
+        IF cellState = 0 THEN
+            PRINT ".";
+        ELSE
+            PRINT "#"
+        END IF
+    NEXT column
+NEXT row
+
+'================================================================================
+' FRAME RATE CONTROL
+' Creates approximately 60 frames per second using inaudible sound workaround
+' Actual frequency value of 0 creates short delay without producing sound
+'================================================================================
+SOUND 0, 3
+
+' Return to start of simulation loop
+GOTO 1
+
diff --git a/Math/Simulation/Surface tension.png b/Math/Simulation/Surface tension.png
new file mode 100644
index 0000000..181c764
Binary files /dev/null and b/Math/Simulation/Surface tension.png differ
diff --git a/Math/Simulation/Wave 1.bas b/Math/Simulation/Wave 1.bas
new file mode 100755
index 0000000..4baad40
--- /dev/null
+++ b/Math/Simulation/Wave 1.bas	
@@ -0,0 +1,60 @@
+' Program simulate wave propagation across surface.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024 - 2025, Improved program readability
+
+SCREEN 13
+
+DIM SHARED yHigh(1 TO 300)      ' surface height
+DIM SHARED yVelocity(1 TO 300)  ' surface movement direction and velocity
+
+' Initialize the arrays
+FOR x = 1 TO 300
+    yVelocity(x) = 0
+    yHigh(x) = 100
+NEXT x
+
+' Create an initial wave shape
+FOR x = 140 TO 160
+    yHigh(x) = 150
+NEXT x
+
+' Main simulation loop
+1 :
+    ' Draw the wave
+    FOR x = 1 TO 300
+        LINE (x, 0)-(x, 200 - yHigh(x)), 0
+        LINE (x, 200 - yHigh(x))-(x, 200), 15
+    NEXT x
+
+    ' Calculate the average height of neighboring points
+    FOR x = 10 TO 290
+        avgHeight = (yHigh(x - 1) + yHigh(x + 1) + yHigh(x + 2) + yHigh(x - 2)) / 4
+        ' Update the smooth wave height
+        yVelocity(x) = yVelocity(x) + (avgHeight - yHigh(x)) / 5
+        ' Apply a damping factor
+        yVelocity(x) = yVelocity(x) / 1.01
+    NEXT x
+
+    ' Update the wave height based on the smooth values
+    FOR x = 10 TO 290
+        yHigh(x) = yHigh(x) + yVelocity(x)
+        ' Apply smoothing to neighboring points
+        yHigh(x - 1) = yHigh(x - 1) + yVelocity(x) / 2
+        yHigh(x + 1) = yHigh(x + 1) + yVelocity(x) / 2
+    NEXT x
+
+    ' Play a sound
+    SOUND 0, .5
+
+    ' Check for user input to exit
+    IF INKEY$ <> "" THEN SYSTEM
+
+' Loop back to the start of the simulation loop
+GOTO 1
+
diff --git a/Math/Simulation/Wave 1.png b/Math/Simulation/Wave 1.png
new file mode 100644
index 0000000..44294d2
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diff --git a/Math/Simulation/Wave 2.bas b/Math/Simulation/Wave 2.bas
new file mode 100755
index 0000000..2b4e81f
--- /dev/null
+++ b/Math/Simulation/Wave 2.bas	
@@ -0,0 +1,59 @@
+' Program renders 2D surface of a water. Water surface is disturbed by random rain droplets.
+' Program simulates and visualizes propagating waves on the water surface.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003, Initial version
+' 2024 - 2025, Improved program readability
+
+SCREEN 13
+
+DIM SHARED surfaceHeight(1 TO 300)
+DIM SHARED verticalMovementSpeed(1 TO 300)
+
+FOR x = 1 TO 300
+    verticalMovementSpeed(x) = 0
+    surfaceHeight(x) = 50
+NEXT x
+
+' Main loop
+1
+
+CLS
+FOR x = 1 TO 300
+    ' Draw the current wave height at each point
+    PSET (x, 200 - surfaceHeight(x)), 31
+NEXT x
+
+' Calculate new wave heights based on neighboring points
+FOR x = 10 TO 290
+    averageNeighborHeights = (surfaceHeight(x - 1) + surfaceHeight(x + 1) + surfaceHeight(x + 2) + surfaceHeight(x - 2)) / 4
+    verticalMovementSpeed(x) = verticalMovementSpeed(x) + (averageNeighborHeights - surfaceHeight(x)) / 5
+    ' Smooth the new wave heights
+    verticalMovementSpeed(x) = verticalMovementSpeed(x) / 1.01
+NEXT x
+
+' Update the current wave heights with the newly calculated values
+FOR x = 10 TO 290
+    surfaceHeight(x) = surfaceHeight(x) + verticalMovementSpeed(x)
+NEXT x
+
+' Randomly generate a new wave at the start point
+IF RND * 100 < 2 THEN
+    newWaveIndex = RND * 200
+    waveAmplitude = RND * 10 + 2
+    FOR x = 0 TO 3.14 STEP 3.14 / waveAmplitude
+        surfaceHeight(newWaveIndex) = surfaceHeight(newWaveIndex) + SIN(x) * waveAmplitude * 3
+        newWaveIndex = newWaveIndex + 1
+    NEXT x
+END IF
+
+' Check for user input to exit the program
+IF INKEY$ <> "" THEN SYSTEM
+
+' Go back to the main loop
+GOTO 1
diff --git a/Math/Simulation/Wave 2.png b/Math/Simulation/Wave 2.png
new file mode 100644
index 0000000..abd173f
Binary files /dev/null and b/Math/Simulation/Wave 2.png differ
diff --git a/Math/Sine computation.bas b/Math/Sine computation.bas
new file mode 100755
index 0000000..8a85efc
--- /dev/null
+++ b/Math/Sine computation.bas	
@@ -0,0 +1,52 @@
+' Sine calculator without relying on built-in trigonometry functions.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.12, Initial version
+' 2024 - 2025, Improved program readability.
+'
+' This program calculates the sine of an angle without using the
+' built-in SIN function. Then it plots the calculated sine wave
+' alongside the built-in sine wave for comparison. There is
+' intentional vertical 1 pixel offset between the two waves so that we
+' can see them simultaneously.
+
+SCREEN 12
+
+' Draw a horizontal baseline
+LINE (0, 240)-(640, 240), 15
+
+' Initialize variables for the sine wave calculation
+' r represents the current value of the sine approximation
+' r1 represents the rate of change of the sine approximation
+LET radius = 0
+LET rateOfChange = 1
+
+' Iterate over each horizontal pixel to calculate and plot the sine values
+FOR angleDegrees = 1 TO 639
+    ' Calculate the actual sine value using the built-in SIN function
+    ' for comparison.
+    ' Scale and translate the sine wave to fit within the screen coordinates.
+    LET trueSineY = SIN(angleDegrees / 100) * 100 + 240
+    PSET (angleDegrees, trueSineY), 15
+
+    ' Update the rate of change and the radius (sine approximation)
+    ' This is a simple implementation of the differential equation
+    ' that defines the sine function, effectively integrating over time
+    LET rateOfChange = rateOfChange + ((0 - radius) / 10000)
+    LET radius = radius + rateOfChange
+
+    ' Calculate the approximate sine value using our own method
+    ' Offset the plot by 241 pixels to display below the true sine wave
+    LET approxSineY = radius
+    PSET (angleDegrees, approxSineY + 241), 12
+NEXT angleDegrees
+
+' Wait for a key press before ending the program
+PRINT "Press any key to exit."
+DO UNTIL INKEY$ <> ""
+LOOP
diff --git a/Math/Sine computation.png b/Math/Sine computation.png
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diff --git a/Math/Truth table calculator/img/screenshot, 1.png b/Math/Truth table calculator/img/screenshot, 1.png
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diff --git a/Math/Truth table calculator/img/screenshot, 2.png b/Math/Truth table calculator/img/screenshot, 2.png
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diff --git a/Math/Truth table calculator/img/screenshot, 3.png b/Math/Truth table calculator/img/screenshot, 3.png
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diff --git a/Math/Truth table calculator/index.html b/Math/Truth table calculator/index.html
new file mode 100644
index 0000000..89a2606
--- /dev/null
+++ b/Math/Truth table calculator/index.html	
@@ -0,0 +1,1683 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2025-05-31 la 07:09 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Truth table calculator</title>
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
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+              font-size: medium;
+              font-weight: bold;
+              margin-top:0; }
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+  .done   { font-family: monospace; color: green; }
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+  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
+  .org-left   { margin-left: 0px;  margin-right: auto; text-align: left; }
+  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #e6e6e6;
+    border-radius: 3px;
+    background-color: #f2f2f2;
+    padding: 8pt;
+    font-family: monospace;
+    overflow: auto;
+    margin: 1.2em;
+  }
+  pre.src {
+    position: relative;
+    overflow: auto;
+  }
+  pre.src:before {
+    display: none;
+    position: absolute;
+    top: -8px;
+    right: 12px;
+    padding: 3px;
+    color: #555;
+    background-color: #f2f2f299;
+  }
+  pre.src:hover:before { display: inline; margin-top: 14px;}
+  /* Languages per Org manual */
+  pre.src-asymptote:before { content: 'Asymptote'; }
+  pre.src-awk:before { content: 'Awk'; }
+  pre.src-authinfo::before { content: 'Authinfo'; }
+  pre.src-C:before { content: 'C'; }
+  /* pre.src-C++ doesn't work in CSS */
+  pre.src-clojure:before { content: 'Clojure'; }
+  pre.src-css:before { content: 'CSS'; }
+  pre.src-D:before { content: 'D'; }
+  pre.src-ditaa:before { content: 'ditaa'; }
+  pre.src-dot:before { content: 'Graphviz'; }
+  pre.src-calc:before { content: 'Emacs Calc'; }
+  pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
+  pre.src-fortran:before { content: 'Fortran'; }
+  pre.src-gnuplot:before { content: 'gnuplot'; }
+  pre.src-haskell:before { content: 'Haskell'; }
+  pre.src-hledger:before { content: 'hledger'; }
+  pre.src-java:before { content: 'Java'; }
+  pre.src-js:before { content: 'Javascript'; }
+  pre.src-latex:before { content: 'LaTeX'; }
+  pre.src-ledger:before { content: 'Ledger'; }
+  pre.src-lisp:before { content: 'Lisp'; }
+  pre.src-lilypond:before { content: 'Lilypond'; }
+  pre.src-lua:before { content: 'Lua'; }
+  pre.src-matlab:before { content: 'MATLAB'; }
+  pre.src-mscgen:before { content: 'Mscgen'; }
+  pre.src-ocaml:before { content: 'Objective Caml'; }
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+  pre.src-picolisp:before { content: 'Pico Lisp'; }
+  pre.src-scala:before { content: 'Scala'; }
+  pre.src-shell:before { content: 'Shell Script'; }
+  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
+  /* additional language identifiers per "defun org-babel-execute"
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+  pre.src-cpp:before  { content: 'C++'; }
+  pre.src-abc:before  { content: 'ABC'; }
+  pre.src-coq:before  { content: 'Coq'; }
+  pre.src-groovy:before  { content: 'Groovy'; }
+  /* additional language identifiers from org-babel-shell-names in
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+  pre.src-mksh:before  { content: 'mksh'; }
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+  /* Additional Emacs modes also supported by the LaTeX listings package */
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+  pre.src-caml:before { content: 'Caml'; }
+  pre.src-delphi:before { content: 'Delphi'; }
+  pre.src-html:before { content: 'HTML'; }
+  pre.src-idl:before { content: 'IDL'; }
+  pre.src-mercury:before { content: 'Mercury'; }
+  pre.src-metapost:before { content: 'MetaPost'; }
+  pre.src-modula-2:before { content: 'Modula-2'; }
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+  pre.src-prolog:before { content: 'Prolog'; }
+  pre.src-simula:before { content: 'Simula'; }
+  pre.src-tcl:before { content: 'tcl'; }
+  pre.src-tex:before { content: 'TeX'; }
+  pre.src-plain-tex:before { content: 'Plain TeX'; }
+  pre.src-verilog:before { content: 'Verilog'; }
+  pre.src-vhdl:before { content: 'VHDL'; }
+  pre.src-xml:before { content: 'XML'; }
+  pre.src-nxml:before { content: 'XML'; }
+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
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+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
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+  td.org-center { text-align: center; }
+  dt { font-weight: bold; }
+  .footpara { display: inline; }
+  .footdef  { margin-bottom: 1em; }
+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
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+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
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+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
+<style type="text/css">
+* {    border-color: #657b83;}a {    color: #268bd2 !important;}a:visited {    color: #6c71c4 !important;}body {    background-color: #002b36 !important;    color: #839496 !important;    font-family: Libre Baskerville, serif;}html {    background-color: #002b36 !important;}input,textarea {    background-color: #073642 !important;    color: #839496 !important;}blockquote,code,pre {    background-color: #073642 !important;    border: 1px solid #094352 !important;    border-radius: 2px;    box-shadow: none;    color: #839496 !important;}code {    font-size: 1.2em;}img {    margin: 0.5em;}.buttons {    background-color: #073642 !important;    color: #93a1a1 !important;    font-family: sans-serif;    font-size: 1.5rem;}.hsReviewPanel {    display: none;}.title {    border: 0;}#postamble {    display: none;}#banner {    text-align: center;}#tabs {    background-color: #073642 !important;    float: left;    margin: 0px 0px 20px 0px;    padding: 0;    width: 100%;    font-family: sans-serif;}#tabs ul {    margin: 0;    padding: 0;}#tabs li {    float: left;    list-style-type: none;    margin: 0px 2px 0px 0px;    padding: 0px 0px 0px 0px;    white-space: nowrap;}#tabs li a {    display: block;    font-size: 120%;    font-weight: bold;    margin: 0;    padding: 4px 10px 4px 10px;    text-decoration: none;}#tabs li a:hover {    color: #90c5eb !important;}#tabs li.ui-tabs-active a {    background-color: #094352 !important;    color: #59a9e1 !important;}#content {    clear: both;    width: 80%;}#content > p {    margin: 1em;}#content > div > h2 {    margin: 0.25rem;}#postamble {    text-align: right;}blockquote {    background-color: #073642 !important;    padding-left: 0.75em;    padding-right: 0.75em;    padding-top: 0.01em;    padding-bottom: 0.01em;    overflow: hidden;    margin-left: 0;}.outline-text-2,.outline-text-3,.outline-text-4,.outline-text-5,.outline-text-6 {    padding-left: 4%;}.outline-3 {    padding-left: 4%;}.outline-4 {    padding-left: 4%;}.outline-5 {    padding-left: 4%;}.outline-6 {    padding-left: 4%;}h1,h2,h3,h4,h5,h6 {    font-family: sans-serif;    border-bottom: 2px solid;    border-color: #094352 !important;}a:hover {    text-decoration: underline;}#search {    display: block;    float: right;}.tag {    background-color: #002b36 !important;    color: #93a1a1 !important;    border: 0px;}.tag span {    background-color: #094352 !important;    margin: 0.25em;    padding: 0.25em;}#table-of-contents {    display: table;    float: right;}#table-of-contents h2 {    display: none;}#table-of-contents li {    list-style-type: none;}#table-of-contents a:hover {    text-decoration: underline;}#minitoc {    background-color: #073642 !important;    position: fixed;    top: 0px;    right: -5px;    padding: 0.5em;    z-index: 200;    width: 18%;    word-wrap: normal;    overflow: hidden;}#minitoc ul {    margin: 0.5em;    padding-left: 1em;}#minitoc h2 {    margin-top: 0;    margin-bottom: 0;    font-size: 110%;}#minitoc a {    display: block;    font-family: sans-serif;    text-decoration: none;}#minitoc a:hover {    text-decoration: underline;}/* #minitoc a { *//*   display: none; *//* } */#minitoc:hover a {    display: block;}#toTop {    top: -100px;    position: fixed;    text-align: center;    z-index: 999;    display: none;}#toTop:hover {    text-decoration: underline;}#left-panel-wrapper {    display: none;    position: fixed;    z-index: 200;}#left-panel-contents {    display: none;    position: fixed;    text-align: left;    top: 0;    z-index: 200;}#left-panel-button {    transform: rotate(90deg);    left: -23px;    position: fixed;    top: 50%;    z-index: 200;}#right-panel-wrapper {    position: fixed;    z-index: 200;}#right-panel-contents {    display: none;    z-index: 200;    position: fixed;    text-align: left;    top: 0;}.snippet-copy-to-clipboard {    display: none;    position: absolute;    left: 50px;    top: 50px;}.org-ol > li,.org-dl > dt {    margin-top: 0.5em;}.org-ul {    margin-top: 1em;    margin-bottom: 1em;}.org-ul li {    margin-top: 0.5em;}.org-ul > li > a {    font-family: sans-serif;}
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e._mouseDown(t)}).bind("click."+this.widgetName,function(i){return!0===t.data(i.target,e.widgetName+".preventClickEvent")?(t.removeData(i.target,e.widgetName+".preventClickEvent"),i.stopImmediatePropagation(),!1):undefined}),this.started=!1},_mouseDestroy:function(){this.element.unbind("."+this.widgetName),this._mouseMoveDelegate&&t(document).unbind("mousemove."+this.widgetName,this._mouseMoveDelegate).unbind("mouseup."+this.widgetName,this._mouseUpDelegate)},_mouseDown:function(i){if(!e){this._mouseStarted&&this._mouseUp(i),this._mouseDownEvent=i;var s=this,n=1===i.which,o="string"==typeof this.options.cancel&&i.target.nodeName?t(i.target).closest(this.options.cancel).length:!1;return n&&!o&&this._mouseCapture(i)?(this.mouseDelayMet=!this.options.delay,this.mouseDelayMet||(this._mouseDelayTimer=setTimeout(function(){s.mouseDelayMet=!0},this.options.delay)),this._mouseDistanceMet(i)&&this._mouseDelayMet(i)&&(this._mouseStarted=this._mouseStart(i)!==!1,!this._mouseStarted)?(i.preventDefault(),!0):(!0===t.data(i.target,this.widgetName+".preventClickEvent")&&t.removeData(i.target,this.widgetName+".preventClickEvent"),this._mouseMoveDelegate=function(t){return s._mouseMove(t)},this._mouseUpDelegate=function(t){return s._mouseUp(t)},t(document).bind("mousemove."+this.widgetName,this._mouseMoveDelegate).bind("mouseup."+this.widgetName,this._mouseUpDelegate),i.preventDefault(),e=!0,!0)):!0}},_mouseMove:function(e){return t.ui.ie&&(!document.documentMode||9>document.documentMode)&&!e.button?this._mouseUp(e):this._mouseStarted?(this._mouseDrag(e),e.preventDefault()):(this._mouseDistanceMet(e)&&this._mouseDelayMet(e)&&(this._mouseStarted=this._mouseStart(this._mouseDownEvent,e)!==!1,this._mouseStarted?this._mouseDrag(e):this._mouseUp(e)),!this._mouseStarted)},_mouseUp:function(e){return t(document).unbind("mousemove."+this.widgetName,this._mouseMoveDelegate).unbind("mouseup."+this.widgetName,this._mouseUpDelegate),this._mouseStarted&&(this._mouseStarted=!1,e.target===this._mouseDownEvent.target&&t.data(e.target,this.widgetName+".preventClickEvent",!0),this._mouseStop(e)),!1},_mouseDistanceMet:function(t){return Math.max(Math.abs(this._mouseDownEvent.pageX-t.pageX),Math.abs(this._mouseDownEvent.pageY-t.pageY))>=this.options.distance},_mouseDelayMet:function(){return this.mouseDelayMet},_mouseStart:function(){},_mouseDrag:function(){},_mouseStop:function(){},_mouseCapture:function(){return!0}})}(jQuery),function(t){t.widget("ui.draggable",t.ui.mouse,{version:"1.10.2",widgetEventPrefix:"drag",options:{addClasses:!0,appendTo:"parent",axis:!1,connectToSortable:!1,containment:!1,cursor:"auto",cursorAt:!1,grid:!1,handle:!1,helper:"original",iframeFix:!1,opacity:!1,refreshPositions:!1,revert:!1,revertDuration:500,scope:"default",scroll:!0,scrollSensitivity:20,scrollSpeed:20,snap:!1,snapMode:"both",snapTolerance:20,stack:!1,zIndex:!1,drag:null,start:null,stop:null},_create:function(){"original"!==this.options.helper||/^(?:r|a|f)/.test(this.element.css("position"))||(this.element[0].style.position="relative"),this.options.addClasses&&this.element.addClass("ui-draggable"),this.options.disabled&&this.element.addClass("ui-draggable-disabled"),this._mouseInit()},_destroy:function(){this.element.removeClass("ui-draggable ui-draggable-dragging ui-draggable-disabled"),this._mouseDestroy()},_mouseCapture:function(e){var i=this.options;return this.helper||i.disabled||t(e.target).closest(".ui-resizable-handle").length>0?!1:(this.handle=this._getHandle(e),this.handle?(t(i.iframeFix===!0?"iframe":i.iframeFix).each(function(){t("<div class='ui-draggable-iframeFix' style='background: #fff;'></div>").css({width:this.offsetWidth+"px",height:this.offsetHeight+"px",position:"absolute",opacity:"0.001",zIndex:1e3}).css(t(this).offset()).appendTo("body")}),!0):!1)},_mouseStart:function(e){var i=this.options;return this.helper=this._createHelper(e),this.helper.addClass("ui-draggable-dragging"),this._cacheHelperProportions(),t.ui.ddmanager&&(t.ui.ddmanager.current=this),this._cacheMargins(),this.cssPosition=this.helper.css("position"),this.scrollParent=this.helper.scrollParent(),this.offset=this.positionAbs=this.element.offset(),this.offset={top:this.offset.top-this.margins.top,left:this.offset.left-this.margins.left},t.extend(this.offset,{click:{left:e.pageX-this.offset.left,top:e.pageY-this.offset.top},parent:this._getParentOffset(),relative:this._getRelativeOffset()}),this.originalPosition=this.position=this._generatePosition(e),this.originalPageX=e.pageX,this.originalPageY=e.pageY,i.cursorAt&&this._adjustOffsetFromHelper(i.cursorAt),i.containment&&this._setContainment(),this._trigger("start",e)===!1?(this._clear(),!1):(this._cacheHelperProportions(),t.ui.ddmanager&&!i.dropBehaviour&&t.ui.ddmanager.prepareOffsets(this,e),this._mouseDrag(e,!0),t.ui.ddmanager&&t.ui.ddmanager.dragStart(this,e),!0)},_mouseDrag:function(e,i){if(this.position=this._generatePosition(e),this.positionAbs=this._convertPositionTo("absolute"),!i){var s=this._uiHash();if(this._trigger("drag",e,s)===!1)return this._mouseUp({}),!1;this.position=s.position}return this.options.axis&&"y"===this.options.axis||(this.helper[0].style.left=this.position.left+"px"),this.options.axis&&"x"===this.options.axis||(this.helper[0].style.top=this.position.top+"px"),t.ui.ddmanager&&t.ui.ddmanager.drag(this,e),!1},_mouseStop:function(e){var i,s=this,n=!1,o=!1;for(t.ui.ddmanager&&!this.options.dropBehaviour&&(o=t.ui.ddmanager.drop(this,e)),this.dropped&&(o=this.dropped,this.dropped=!1),i=this.element[0];i&&(i=i.parentNode);)i===document&&(n=!0);return n||"original"!==this.options.helper?("invalid"===this.options.revert&&!o||"valid"===this.options.revert&&o||this.options.revert===!0||t.isFunction(this.options.revert)&&this.options.revert.call(this.element,o)?t(this.helper).animate(this.originalPosition,parseInt(this.options.revertDuration,10),function(){s._trigger("stop",e)!==!1&&s._clear()}):this._trigger("stop",e)!==!1&&this._clear(),!1):!1},_mouseUp:function(e){return t("div.ui-draggable-iframeFix").each(function(){this.parentNode.removeChild(this)}),t.ui.ddmanager&&t.ui.ddmanager.dragStop(this,e),t.ui.mouse.prototype._mouseUp.call(this,e)},cancel:function(){return this.helper.is(".ui-draggable-dragging")?this._mouseUp({}):this._clear(),this},_getHandle:function(e){return this.options.handle?!!t(e.target).closest(this.element.find(this.options.handle)).length:!0},_createHelper:function(e){var i=this.options,s=t.isFunction(i.helper)?t(i.helper.apply(this.element[0],[e])):"clone"===i.helper?this.element.clone().removeAttr("id"):this.element;return s.parents("body").length||s.appendTo("parent"===i.appendTo?this.element[0].parentNode:i.appendTo),s[0]===this.element[0]||/(fixed|absolute)/.test(s.css("position"))||s.css("position","absolute"),s},_adjustOffsetFromHelper:function(e){"string"==typeof e&&(e=e.split(" ")),t.isArray(e)&&(e={left:+e[0],top:+e[1]||0}),"left"in e&&(this.offset.click.left=e.left+this.margins.left),"right"in e&&(this.offset.click.left=this.helperProportions.width-e.right+this.margins.left),"top"in e&&(this.offset.click.top=e.top+this.margins.top),"bottom"in e&&(this.offset.click.top=this.helperProportions.height-e.bottom+this.margins.top)},_getParentOffset:function(){this.offsetParent=this.helper.offsetParent();var e=this.offsetParent.offset();return"absolute"===this.cssPosition&&this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])&&(e.left+=this.scrollParent.scrollLeft(),e.top+=this.scrollParent.scrollTop()),(this.offsetParent[0]===document.body||this.offsetParent[0].tagName&&"html"===this.offsetParent[0].tagName.toLowerCase()&&t.ui.ie)&&(e={top:0,left:0}),{top:e.top+(parseInt(this.offsetParent.css("borderTopWidth"),10)||0),left:e.left+(parseInt(this.offsetParent.css("borderLeftWidth"),10)||0)}},_getRelativeOffset:function(){if("relative"===this.cssPosition){var t=this.element.position();return{top:t.top-(parseInt(this.helper.css("top"),10)||0)+this.scrollParent.scrollTop(),left:t.left-(parseInt(this.helper.css("left"),10)||0)+this.scrollParent.scrollLeft()}}return{top:0,left:0}},_cacheMargins:function(){this.margins={left:parseInt(this.element.css("marginLeft"),10)||0,top:parseInt(this.element.css("marginTop"),10)||0,right:parseInt(this.element.css("marginRight"),10)||0,bottom:parseInt(this.element.css("marginBottom"),10)||0}},_cacheHelperProportions:function(){this.helperProportions={width:this.helper.outerWidth(),height:this.helper.outerHeight()}},_setContainment:function(){var e,i,s,n=this.options;if("parent"===n.containment&&(n.containment=this.helper[0].parentNode),("document"===n.containment||"window"===n.containment)&&(this.containment=["document"===n.containment?0:t(window).scrollLeft()-this.offset.relative.left-this.offset.parent.left,"document"===n.containment?0:t(window).scrollTop()-this.offset.relative.top-this.offset.parent.top,("document"===n.containment?0:t(window).scrollLeft())+t("document"===n.containment?document:window).width()-this.helperProportions.width-this.margins.left,("document"===n.containment?0:t(window).scrollTop())+(t("document"===n.containment?document:window).height()||document.body.parentNode.scrollHeight)-this.helperProportions.height-this.margins.top]),/^(document|window|parent)$/.test(n.containment)||n.containment.constructor===Array)n.containment.constructor===Array&&(this.containment=n.containment);else{if(i=t(n.containment),s=i[0],!s)return;e="hidden"!==t(s).css("overflow"),this.containment=[(parseInt(t(s).css("borderLeftWidth"),10)||0)+(parseInt(t(s).css("paddingLeft"),10)||0),(parseInt(t(s).css("borderTopWidth"),10)||0)+(parseInt(t(s).css("paddingTop"),10)||0),(e?Math.max(s.scrollWidth,s.offsetWidth):s.offsetWidth)-(parseInt(t(s).css("borderRightWidth"),10)||0)-(parseInt(t(s).css("paddingRight"),10)||0)-this.helperProportions.width-this.margins.left-this.margins.right,(e?Math.max(s.scrollHeight,s.offsetHeight):s.offsetHeight)-(parseInt(t(s).css("borderBottomWidth"),10)||0)-(parseInt(t(s).css("paddingBottom"),10)||0)-this.helperProportions.height-this.margins.top-this.margins.bottom],this.relative_container=i}},_convertPositionTo:function(e,i){i||(i=this.position);var s="absolute"===e?1:-1,n="absolute"!==this.cssPosition||this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])?this.scrollParent:this.offsetParent,o=/(html|body)/i.test(n[0].tagName);return{top:i.top+this.offset.relative.top*s+this.offset.parent.top*s-("fixed"===this.cssPosition?-this.scrollParent.scrollTop():o?0:n.scrollTop())*s,left:i.left+this.offset.relative.left*s+this.offset.parent.left*s-("fixed"===this.cssPosition?-this.scrollParent.scrollLeft():o?0:n.scrollLeft())*s}},_generatePosition:function(e){var i,s,n,o,a=this.options,r="absolute"!==this.cssPosition||this.scrollParent[0]!==document&&t.contains(this.scrollParent[0],this.offsetParent[0])?this.scrollParent:this.offsetParent,h=/(html|body)/i.test(r[0].tagName),l=e.pageX,c=e.pageY;return this.originalPosition&&(this.containment&&(this.relative_container?(s=this.relative_container.offset(),i=[this.containment[0]+s.left,this.containment[1]+s.top,this.containment[2]+s.left,this.containment[3]+s.top]):i=this.containment,e.pageX-this.offset.click.left<i[0]&&(l=i[0]+this.offset.click.left),e.pageY-this.offset.click.top<i[1]&&(c=i[1]+this.offset.click.top),e.pageX-this.offset.click.left>i[2]&&(l=i[2]+this.offset.click.left),e.pageY-this.offset.click.top>i[3]&&(c=i[3]+this.offset.click.top)),a.grid&&(n=a.grid[1]?this.originalPageY+Math.round((c-this.originalPageY)/a.grid[1])*a.grid[1]:this.originalPageY,c=i?n-this.offset.click.top>=i[1]||n-this.offset.click.top>i[3]?n:n-this.offset.click.top>=i[1]?n-a.grid[1]:n+a.grid[1]:n,o=a.grid[0]?this.originalPageX+Math.round((l-this.originalPageX)/a.grid[0])*a.grid[0]:this.originalPageX,l=i?o-this.offset.click.left>=i[0]||o-this.offset.click.left>i[2]?o:o-this.offset.click.left>=i[0]?o-a.grid[0]:o+a.grid[0]:o)),{top:c-this.offset.click.top-this.offset.relative.top-this.offset.parent.top+("fixed"===this.cssPosition?-this.scrollParent.scrollTop():h?0:r.scrollTop()),left:l-this.offset.click.left-this.offset.relative.left-this.offset.parent.left+("fixed"===this.cssPosition?-this.scrollParent.scrollLeft():h?0:r.scrollLeft())}},_clear:function(){this.helper.removeClass("ui-draggable-dragging"),this.helper[0]===this.element[0]||this.cancelHelperRemoval||this.helper.remove(),this.helper=null,this.cancelHelperRemoval=!1},_trigger:function(e,i,s){return s=s||this._uiHash(),t.ui.plugin.call(this,e,[i,s]),"drag"===e&&(this.positionAbs=this._convertPositionTo("absolute")),t.Widget.prototype._trigger.call(this,e,i,s)},plugins:{},_uiHash:function(){return{helper:this.helper,position:this.position,originalPosition:this.originalPosition,offset:this.positionAbs}}}),t.ui.plugin.add("draggable","connectToSortable",{start:function(e,i){var s=t(this).data("ui-draggable"),n=s.options,o=t.extend({},i,{item:s.element});s.sortables=[],t(n.connectToSortable).each(function(){var i=t.data(this,"ui-sortable");i&&!i.options.disabled&&(s.sortables.push({instance:i,shouldRevert:i.options.revert}),i.refreshPositions(),i._trigger("activate",e,o))})},stop:function(e,i){var s=t(this).data("ui-draggable"),n=t.extend({},i,{item:s.element});t.each(s.sortables,function(){this.instance.isOver?(this.instance.isOver=0,s.cancelHelperRemoval=!0,this.instance.cancelHelperRemoval=!1,this.shouldRevert&&(this.instance.options.revert=this.shouldRevert),this.instance._mouseStop(e),this.instance.options.helper=this.instance.options._helper,"original"===s.options.helper&&this.instance.currentItem.css({top:"auto",left:"auto"})):(this.instance.cancelHelperRemoval=!1,this.instance._trigger("deactivate",e,n))})},drag:function(e,i){var s=t(this).data("ui-draggable"),n=this;t.each(s.sortables,function(){var o=!1,a=this;this.instance.positionAbs=s.positionAbs,this.instance.helperProportions=s.helperProportions,this.instance.offset.click=s.offset.click,this.instance._intersectsWith(this.instance.containerCache)&&(o=!0,t.each(s.sortables,function(){return this.instance.positionAbs=s.positionAbs,this.instance.helperProportions=s.helperProportions,this.instance.offset.click=s.offset.click,this!==a&&this.instance._intersectsWith(this.instance.containerCache)&&t.contains(a.instance.element[0],this.instance.element[0])&&(o=!1),o})),o?(this.instance.isOver||(this.instance.isOver=1,this.instance.currentItem=t(n).clone().removeAttr("id").appendTo(this.instance.element).data("ui-sortable-item",!0),this.instance.options._helper=this.instance.options.helper,this.instance.options.helper=function(){return i.helper[0]},e.target=this.instance.currentItem[0],this.instance._mouseCapture(e,!0),this.instance._mouseStart(e,!0,!0),this.instance.offset.click.top=s.offset.click.top,this.instance.offset.click.left=s.offset.click.left,this.instance.offset.parent.left-=s.offset.parent.left-this.instance.offset.parent.left,this.instance.offset.parent.top-=s.offset.parent.top-this.instance.offset.parent.top,s._trigger("toSortable",e),s.dropped=this.instance.element,s.currentItem=s.element,this.instance.fromOutside=s),this.instance.currentItem&&this.instance._mouseDrag(e)):this.instance.isOver&&(this.instance.isOver=0,this.instance.cancelHelperRemoval=!0,this.instance.options.revert=!1,this.instance._trigger("out",e,this.instance._uiHash(this.instance)),this.instance._mouseStop(e,!0),this.instance.options.helper=this.instance.options._helper,this.instance.currentItem.remove(),this.instance.placeholder&&this.instance.placeholder.remove(),s._trigger("fromSortable",e),s.dropped=!1)})}}),t.ui.plugin.add("draggable","cursor",{start:function(){var e=t("body"),i=t(this).data("ui-draggable").options;e.css("cursor")&&(i._cursor=e.css("cursor")),e.css("cursor",i.cursor)},stop:function(){var e=t(this).data("ui-draggable").options;e._cursor&&t("body").css("cursor",e._cursor)}}),t.ui.plugin.add("draggable","opacity",{start:function(e,i){var s=t(i.helper),n=t(this).data("ui-draggable").options;s.css("opacity")&&(n._opacity=s.css("opacity")),s.css("opacity",n.opacity)},stop:function(e,i){var s=t(this).data("ui-draggable").options;s._opacity&&t(i.helper).css("opacity",s._opacity)}}),t.ui.plugin.add("draggable","scroll",{start:function(){var e=t(this).data("ui-draggable");e.scrollParent[0]!==document&&"HTML"!==e.scrollParent[0].tagName&&(e.overflowOffset=e.scrollParent.offset())},drag:function(e){var i=t(this).data("ui-draggable"),s=i.options,n=!1;i.scrollParent[0]!==document&&"HTML"!==i.scrollParent[0].tagName?(s.axis&&"x"===s.axis||(i.overflowOffset.top+i.scrollParent[0].offsetHeight-e.pageY<s.scrollSensitivity?i.scrollParent[0].scrollTop=n=i.scrollParent[0].scrollTop+s.scrollSpeed:e.pageY-i.overflowOffset.top<s.scrollSensitivity&&(i.scrollParent[0].scrollTop=n=i.scrollParent[0].scrollTop-s.scrollSpeed)),s.axis&&"y"===s.axis||(i.overflowOffset.left+i.scrollParent[0].offsetWidth-e.pageX<s.scrollSensitivity?i.scrollParent[0].scrollLeft=n=i.scrollParent[0].scrollLeft+s.scrollSpeed:e.pageX-i.overflowOffset.left<s.scrollSensitivity&&(i.scrollParent[0].scrollLeft=n=i.scrollParent[0].scrollLeft-s.scrollSpeed))):(s.axis&&"x"===s.axis||(e.pageY-t(document).scrollTop()<s.scrollSensitivity?n=t(document).scrollTop(t(document).scrollTop()-s.scrollSpeed):t(window).height()-(e.pageY-t(document).scrollTop())<s.scrollSensitivity&&(n=t(document).scrollTop(t(document).scrollTop()+s.scrollSpeed))),s.axis&&"y"===s.axis||(e.pageX-t(document).scrollLeft()<s.scrollSensitivity?n=t(document).scrollLeft(t(document).scrollLeft()-s.scrollSpeed):t(window).width()-(e.pageX-t(document).scrollLeft())<s.scrollSensitivity&&(n=t(document).scrollLeft(t(document).scrollLeft()+s.scrollSpeed)))),n!==!1&&t.ui.ddmanager&&!s.dropBehaviour&&t.ui.ddmanager.prepareOffsets(i,e)}}),t.ui.plugin.add("draggable","snap",{start:function(){var e=t(this).data("ui-draggable"),i=e.options;e.snapElements=[],t(i.snap.constructor!==String?i.snap.items||":data(ui-draggable)":i.snap).each(function(){var i=t(this),s=i.offset();this!==e.element[0]&&e.snapElements.push({item:this,width:i.outerWidth(),height:i.outerHeight(),top:s.top,left:s.left})})},drag:function(e,i){var s,n,o,a,r,h,l,c,u,d,p=t(this).data("ui-draggable"),f=p.options,g=f.snapTolerance,m=i.offset.left,v=m+p.helperProportions.width,_=i.offset.top,b=_+p.helperProportions.height;for(u=p.snapElements.length-1;u>=0;u--)r=p.snapElements[u].left,h=r+p.snapElements[u].width,l=p.snapElements[u].top,c=l+p.snapElements[u].height,m>r-g&&h+g>m&&_>l-g&&c+g>_||m>r-g&&h+g>m&&b>l-g&&c+g>b||v>r-g&&h+g>v&&_>l-g&&c+g>_||v>r-g&&h+g>v&&b>l-g&&c+g>b?("inner"!==f.snapMode&&(s=g>=Math.abs(l-b),n=g>=Math.abs(c-_),o=g>=Math.abs(r-v),a=g>=Math.abs(h-m),s&&(i.position.top=p._convertPositionTo("relative",{top:l-p.helperProportions.height,left:0}).top-p.margins.top),n&&(i.position.top=p._convertPositionTo("relative",{top:c,left:0}).top-p.margins.top),o&&(i.position.left=p._convertPositionTo("relative",{top:0,left:r-p.helperProportions.width}).left-p.margins.left),a&&(i.position.left=p._convertPositionTo("relative",{top:0,left:h}).left-p.margins.left)),d=s||n||o||a,"outer"!==f.snapMode&&(s=g>=Math.abs(l-_),n=g>=Math.abs(c-b),o=g>=Math.abs(r-m),a=g>=Math.abs(h-v),s&&(i.position.top=p._convertPositionTo("relative",{top:l,left:0}).top-p.margins.top),n&&(i.position.top=p._convertPositionTo("relative",{top:c-p.helperProportions.height,left:0}).top-p.margins.top),o&&(i.position.left=p._convertPositionTo("relative",{top:0,left:r}).left-p.margins.left),a&&(i.position.left=p._convertPositionTo("relative",{top:0,left:h-p.helperProportions.width}).left-p.margins.left)),!p.snapElements[u].snapping&&(s||n||o||a||d)&&p.options.snap.snap&&p.options.snap.snap.call(p.element,e,t.extend(p._uiHash(),{snapItem:p.snapElements[u].item})),p.snapElements[u].snapping=s||n||o||a||d):(p.snapElements[u].snapping&&p.options.snap.release&&p.options.snap.release.call(p.element,e,t.extend(p._uiHash(),{snapItem:p.snapElements[u].item})),p.snapElements[u].snapping=!1)}}),t.ui.plugin.add("draggable","stack",{start:function(){var e,i=this.data("ui-draggable").options,s=t.makeArray(t(i.stack)).sort(function(e,i){return(parseInt(t(e).css("zIndex"),10)||0)-(parseInt(t(i).css("zIndex"),10)||0)});s.length&&(e=parseInt(t(s[0]).css("zIndex"),10)||0,t(s).each(function(i){t(this).css("zIndex",e+i)}),this.css("zIndex",e+s.length))}}),t.ui.plugin.add("draggable","zIndex",{start:function(e,i){var s=t(i.helper),n=t(this).data("ui-draggable").options;s.css("zIndex")&&(n._zIndex=s.css("zIndex")),s.css("zIndex",n.zIndex)},stop:function(e,i){var s=t(this).data("ui-draggable").options;s._zIndex&&t(i.helper).css("zIndex",s._zIndex)}})}(jQuery),function(t){function e(t,e,i){return t>e&&e+i>t}t.widget("ui.droppable",{version:"1.10.2",widgetEventPrefix:"drop",options:{accept:"*",activeClass:!1,addClasses:!0,greedy:!1,hoverClass:!1,scope:"default",tolerance:"intersect",activate:null,deactivate:null,drop:null,out:null,over:null},_create:function(){var e=this.options,i=e.accept;this.isover=!1,this.isout=!0,this.accept=t.isFunction(i)?i:function(t){return t.is(i)},this.proportions={width:this.element[0].offsetWidth,height:this.element[0].offsetHeight},t.ui.ddmanager.droppables[e.scope]=t.ui.ddmanager.droppables[e.scope]||[],t.ui.ddmanager.droppables[e.scope].push(this),e.addClasses&&this.element.addClass("ui-droppable")},_destroy:function(){for(var e=0,i=t.ui.ddmanager.droppables[this.options.scope];i.length>e;e++)i[e]===this&&i.splice(e,1);this.element.removeClass("ui-droppable ui-droppable-disabled")},_setOption:function(e,i){"accept"===e&&(this.accept=t.isFunction(i)?i:function(t){return t.is(i)}),t.Widget.prototype._setOption.apply(this,arguments)},_activate:function(e){var i=t.ui.ddmanager.current;this.options.activeClass&&this.element.addClass(this.options.activeClass),i&&this._trigger("activate",e,this.ui(i))},_deactivate:function(e){var i=t.ui.ddmanager.current;this.options.activeClass&&this.element.removeClass(this.options.activeClass),i&&this._trigger("deactivate",e,this.ui(i))},_over:function(e){var i=t.ui.ddmanager.current;i&&(i.currentItem||i.element)[0]!==this.element[0]&&this.accept.call(this.element[0],i.currentItem||i.element)&&(this.options.hoverClass&&this.element.addClass(this.options.hoverClass),this._trigger("over",e,this.ui(i)))},_out:function(e){var i=t.ui.ddmanager.current;i&&(i.currentItem||i.element)[0]!==this.element[0]&&this.accept.call(this.element[0],i.currentItem||i.element)&&(this.options.hoverClass&&this.element.removeClass(this.options.hoverClass),this._trigger("out",e,this.ui(i)))},_drop:function(e,i){var s=i||t.ui.ddmanager.current,n=!1;return s&&(s.currentItem||s.element)[0]!==this.element[0]?(this.element.find(":data(ui-droppable)").not(".ui-draggable-dragging").each(function(){var e=t.data(this,"ui-droppable");return e.options.greedy&&!e.options.disabled&&e.options.scope===s.options.scope&&e.accept.call(e.element[0],s.currentItem||s.element)&&t.ui.intersect(s,t.extend(e,{offset:e.element.offset()}),e.options.tolerance)?(n=!0,!1):undefined}),n?!1:this.accept.call(this.element[0],s.currentItem||s.element)?(this.options.activeClass&&this.element.removeClass(this.options.activeClass),this.options.hoverClass&&this.element.removeClass(this.options.hoverClass),this._trigger("drop",e,this.ui(s)),this.element):!1):!1},ui:function(t){return{draggable:t.currentItem||t.element,helper:t.helper,position:t.position,offset:t.positionAbs}}}),t.ui.intersect=function(t,i,s){if(!i.offset)return!1;var n,o,a=(t.positionAbs||t.position.absolute).left,r=a+t.helperProportions.width,h=(t.positionAbs||t.position.absolute).top,l=h+t.helperProportions.height,c=i.offset.left,u=c+i.proportions.width,d=i.offset.top,p=d+i.proportions.height;switch(s){case"fit":return a>=c&&u>=r&&h>=d&&p>=l;case"intersect":return a+t.helperProportions.width/2>c&&u>r-t.helperProportions.width/2&&h+t.helperProportions.height/2>d&&p>l-t.helperProportions.height/2;case"pointer":return n=(t.positionAbs||t.position.absolute).left+(t.clickOffset||t.offset.click).left,o=(t.positionAbs||t.position.absolute).top+(t.clickOffset||t.offset.click).top,e(o,d,i.proportions.height)&&e(n,c,i.proportions.width);case"touch":return(h>=d&&p>=h||l>=d&&p>=l||d>h&&l>p)&&(a>=c&&u>=a||r>=c&&u>=r||c>a&&r>u);default:return!1}},t.ui.ddmanager={current:null,droppables:{"default":[]},prepareOffsets:function(e,i){var s,n,o=t.ui.ddmanager.droppables[e.options.scope]||[],a=i?i.type:null,r=(e.currentItem||e.element).find(":data(ui-droppable)").addBack();t:for(s=0;o.length>s;s++)if(!(o[s].options.disabled||e&&!o[s].accept.call(o[s].element[0],e.currentItem||e.element))){for(n=0;r.length>n;n++)if(r[n]===o[s].element[0]){o[s].proportions.height=0;continue t}o[s].visible="none"!==o[s].element.css("display"),o[s].visible&&("mousedown"===a&&o[s]._activate.call(o[s],i),o[s].offset=o[s].element.offset(),o[s].proportions={width:o[s].element[0].offsetWidth,height:o[s].element[0].offsetHeight})}},drop:function(e,i){var s=!1;return t.each((t.ui.ddmanager.droppables[e.options.scope]||[]).slice(),function(){this.options&&(!this.options.disabled&&this.visible&&t.ui.intersect(e,this,this.options.tolerance)&&(s=this._drop.call(this,i)||s),!this.options.disabled&&this.visible&&this.accept.call(this.element[0],e.currentItem||e.element)&&(this.isout=!0,this.isover=!1,this._deactivate.call(this,i)))}),s},dragStart:function(e,i){e.element.parentsUntil("body").bind("scroll.droppable",function(){e.options.refreshPositions||t.ui.ddmanager.prepareOffsets(e,i)})},drag:function(e,i){e.options.refreshPositions&&t.ui.ddmanager.prepareOffsets(e,i),t.each(t.ui.ddmanager.droppables[e.options.scope]||[],function(){if(!this.options.disabled&&!this.greedyChild&&this.visible){var s,n,o,a=t.ui.intersect(e,this,this.options.tolerance),r=!a&&this.isover?"isout":a&&!this.isover?"isover":null;r&&(this.options.greedy&&(n=this.options.scope,o=this.element.parents(":data(ui-droppable)").filter(function(){return t.data(this,"ui-droppable").options.scope===n}),o.length&&(s=t.data(o[0],"ui-droppable"),s.greedyChild="isover"===r)),s&&"isover"===r&&(s.isover=!1,s.isout=!0,s._out.call(s,i)),this[r]=!0,this["isout"===r?"isover":"isout"]=!1,this["isover"===r?"_over":"_out"].call(this,i),s&&"isout"===r&&(s.isout=!1,s.isover=!0,s._over.call(s,i)))}})},dragStop:function(e,i){e.element.parentsUntil("body").unbind("scroll.droppable"),e.options.refreshPositions||t.ui.ddmanager.prepareOffsets(e,i)}}}(jQuery),function(t){function e(t){return parseInt(t,10)||0}function i(t){return!isNaN(parseInt(t,10))}t.widget("ui.resizable",t.ui.mouse,{version:"1.10.2",widgetEventPrefix:"resize",options:{alsoResize:!1,animate:!1,animateDuration:"slow",animateEasing:"swing",aspectRatio:!1,autoHide:!1,containment:!1,ghost:!1,grid:!1,handles:"e,s,se",helper:!1,maxHeight:null,maxWidth:null,minHeight:10,minWidth:10,zIndex:90,resize:null,start:null,stop:null},_create:function(){var e,i,s,n,o,a=this,r=this.options;if(this.element.addClass("ui-resizable"),t.extend(this,{_aspectRatio:!!r.aspectRatio,aspectRatio:r.aspectRatio,originalElement:this.element,_proportionallyResizeElements:[],_helper:r.helper||r.ghost||r.animate?r.helper||"ui-resizable-helper":null}),this.element[0].nodeName.match(/canvas|textarea|input|select|button|img/i)&&(this.element.wrap(t("<div class='ui-wrapper' style='overflow: hidden;'></div>").css({position:this.element.css("position"),width:this.element.outerWidth(),height:this.element.outerHeight(),top:this.element.css("top"),left:this.element.css("left")})),this.element=this.element.parent().data("ui-resizable",this.element.data("ui-resizable")),this.elementIsWrapper=!0,this.element.css({marginLeft:this.originalElement.css("marginLeft"),marginTop:this.originalElement.css("marginTop"),marginRight:this.originalElement.css("marginRight"),marginBottom:this.originalElement.css("marginBottom")}),this.originalElement.css({marginLeft:0,marginTop:0,marginRight:0,marginBottom:0}),this.originalResizeStyle=this.originalElement.css("resize"),this.originalElement.css("resize","none"),this._proportionallyResizeElements.push(this.originalElement.css({position:"static",zoom:1,display:"block"})),this.originalElement.css({margin:this.originalElement.css("margin")}),this._proportionallyResize()),this.handles=r.handles||(t(".ui-resizable-handle",this.element).length?{n:".ui-resizable-n",e:".ui-resizable-e",s:".ui-resizable-s",w:".ui-resizable-w",se:".ui-resizable-se",sw:".ui-resizable-sw",ne:".ui-resizable-ne",nw:".ui-resizable-nw"}:"e,s,se"),this.handles.constructor===String)for("all"===this.handles&&(this.handles="n,e,s,w,se,sw,ne,nw"),e=this.handles.split(","),this.handles={},i=0;e.length>i;i++)s=t.trim(e[i]),o="ui-resizable-"+s,n=t("<div class='ui-resizable-handle "+o+"'></div>"),n.css({zIndex:r.zIndex}),"se"===s&&n.addClass("ui-icon ui-icon-gripsmall-diagonal-se"),this.handles[s]=".ui-resizable-"+s,this.element.append(n);this._renderAxis=function(e){var i,s,n,o;e=e||this.element;for(i in this.handles)this.handles[i].constructor===String&&(this.handles[i]=t(this.handles[i],this.element).show()),this.elementIsWrapper&&this.originalElement[0].nodeName.match(/textarea|input|select|button/i)&&(s=t(this.handles[i],this.element),o=/sw|ne|nw|se|n|s/.test(i)?s.outerHeight():s.outerWidth(),n=["padding",/ne|nw|n/.test(i)?"Top":/se|sw|s/.test(i)?"Bottom":/^e$/.test(i)?"Right":"Left"].join(""),e.css(n,o),this._proportionallyResize()),t(this.handles[i]).length},this._renderAxis(this.element),this._handles=t(".ui-resizable-handle",this.element).disableSelection(),this._handles.mouseover(function(){a.resizing||(this.className&&(n=this.className.match(/ui-resizable-(se|sw|ne|nw|n|e|s|w)/i)),a.axis=n&&n[1]?n[1]:"se")}),r.autoHide&&(this._handles.hide(),t(this.element).addClass("ui-resizable-autohide").mouseenter(function(){r.disabled||(t(this).removeClass("ui-resizable-autohide"),a._handles.show())}).mouseleave(function(){r.disabled||a.resizing||(t(this).addClass("ui-resizable-autohide"),a._handles.hide())})),this._mouseInit()},_destroy:function(){this._mouseDestroy();var e,i=function(e){t(e).removeClass("ui-resizable ui-resizable-disabled ui-resizable-resizing").removeData("resizable").removeData("ui-resizable").unbind(".resizable").find(".ui-resizable-handle").remove()};return this.elementIsWrapper&&(i(this.element),e=this.element,this.originalElement.css({position:e.css("position"),width:e.outerWidth(),height:e.outerHeight(),top:e.css("top"),left:e.css("left")}).insertAfter(e),e.remove()),this.originalElement.css("resize",this.originalResizeStyle),i(this.originalElement),this},_mouseCapture:function(e){var i,s,n=!1;for(i in this.handles)s=t(this.handles[i])[0],(s===e.target||t.contains(s,e.target))&&(n=!0);return!this.options.disabled&&n},_mouseStart:function(i){var s,n,o,a=this.options,r=this.element.position(),h=this.element;return this.resizing=!0,/absolute/.test(h.css("position"))?h.css({position:"absolute",top:h.css("top"),left:h.css("left")}):h.is(".ui-draggable")&&h.css({position:"absolute",top:r.top,left:r.left}),this._renderProxy(),s=e(this.helper.css("left")),n=e(this.helper.css("top")),a.containment&&(s+=t(a.containment).scrollLeft()||0,n+=t(a.containment).scrollTop()||0),this.offset=this.helper.offset(),this.position={left:s,top:n},this.size=this._helper?{width:h.outerWidth(),height:h.outerHeight()}:{width:h.width(),height:h.height()},this.originalSize=this._helper?{width:h.outerWidth(),height:h.outerHeight()}:{width:h.width(),height:h.height()},this.originalPosition={left:s,top:n},this.sizeDiff={width:h.outerWidth()-h.width(),height:h.outerHeight()-h.height()},this.originalMousePosition={left:i.pageX,top:i.pageY},this.aspectRatio="number"==typeof a.aspectRatio?a.aspectRatio:this.originalSize.width/this.originalSize.height||1,o=t(".ui-resizable-"+this.axis).css("cursor"),t("body").css("cursor","auto"===o?this.axis+"-resize":o),h.addClass("ui-resizable-resizing"),this._propagate("start",i),!0},_mouseDrag:function(e){var i,s=this.helper,n={},o=this.originalMousePosition,a=this.axis,r=this.position.top,h=this.position.left,l=this.size.width,c=this.size.height,u=e.pageX-o.left||0,d=e.pageY-o.top||0,p=this._change[a];return p?(i=p.apply(this,[e,u,d]),this._updateVirtualBoundaries(e.shiftKey),(this._aspectRatio||e.shiftKey)&&(i=this._updateRatio(i,e)),i=this._respectSize(i,e),this._updateCache(i),this._propagate("resize",e),this.position.top!==r&&(n.top=this.position.top+"px"),this.position.left!==h&&(n.left=this.position.left+"px"),this.size.width!==l&&(n.width=this.size.width+"px"),this.size.height!==c&&(n.height=this.size.height+"px"),s.css(n),!this._helper&&this._proportionallyResizeElements.length&&this._proportionallyResize(),t.isEmptyObject(n)||this._trigger("resize",e,this.ui()),!1):!1},_mouseStop:function(e){this.resizing=!1;var i,s,n,o,a,r,h,l=this.options,c=this;return this._helper&&(i=this._proportionallyResizeElements,s=i.length&&/textarea/i.test(i[0].nodeName),n=s&&t.ui.hasScroll(i[0],"left")?0:c.sizeDiff.height,o=s?0:c.sizeDiff.width,a={width:c.helper.width()-o,height:c.helper.height()-n},r=parseInt(c.element.css("left"),10)+(c.position.left-c.originalPosition.left)||null,h=parseInt(c.element.css("top"),10)+(c.position.top-c.originalPosition.top)||null,l.animate||this.element.css(t.extend(a,{top:h,left:r})),c.helper.height(c.size.height),c.helper.width(c.size.width),this._helper&&!l.animate&&this._proportionallyResize()),t("body").css("cursor","auto"),this.element.removeClass("ui-resizable-resizing"),this._propagate("stop",e),this._helper&&this.helper.remove(),!1},_updateVirtualBoundaries:function(t){var e,s,n,o,a,r=this.options;a={minWidth:i(r.minWidth)?r.minWidth:0,maxWidth:i(r.maxWidth)?r.maxWidth:1/0,minHeight:i(r.minHeight)?r.minHeight:0,maxHeight:i(r.maxHeight)?r.maxHeight:1/0},(this._aspectRatio||t)&&(e=a.minHeight*this.aspectRatio,n=a.minWidth/this.aspectRatio,s=a.maxHeight*this.aspectRatio,o=a.maxWidth/this.aspectRatio,e>a.minWidth&&(a.minWidth=e),n>a.minHeight&&(a.minHeight=n),a.maxWidth>s&&(a.maxWidth=s),a.maxHeight>o&&(a.maxHeight=o)),this._vBoundaries=a},_updateCache:function(t){this.offset=this.helper.offset(),i(t.left)&&(this.position.left=t.left),i(t.top)&&(this.position.top=t.top),i(t.height)&&(this.size.height=t.height),i(t.width)&&(this.size.width=t.width)},_updateRatio:function(t){var e=this.position,s=this.size,n=this.axis;return i(t.height)?t.width=t.height*this.aspectRatio:i(t.width)&&(t.height=t.width/this.aspectRatio),"sw"===n&&(t.left=e.left+(s.width-t.width),t.top=null),"nw"===n&&(t.top=e.top+(s.height-t.height),t.left=e.left+(s.width-t.width)),t},_respectSize:function(t){var e=this._vBoundaries,s=this.axis,n=i(t.width)&&e.maxWidth&&e.maxWidth<t.width,o=i(t.height)&&e.maxHeight&&e.maxHeight<t.height,a=i(t.width)&&e.minWidth&&e.minWidth>t.width,r=i(t.height)&&e.minHeight&&e.minHeight>t.height,h=this.originalPosition.left+this.originalSize.width,l=this.position.top+this.size.height,c=/sw|nw|w/.test(s),u=/nw|ne|n/.test(s);return a&&(t.width=e.minWidth),r&&(t.height=e.minHeight),n&&(t.width=e.maxWidth),o&&(t.height=e.maxHeight),a&&c&&(t.left=h-e.minWidth),n&&c&&(t.left=h-e.maxWidth),r&&u&&(t.top=l-e.minHeight),o&&u&&(t.top=l-e.maxHeight),t.width||t.height||t.left||!t.top?t.width||t.height||t.top||!t.left||(t.left=null):t.top=null,t},_proportionallyResize:function(){if(this._proportionallyResizeElements.length){var t,e,i,s,n,o=this.helper||this.element;for(t=0;this._proportionallyResizeElements.length>t;t++){if(n=this._proportionallyResizeElements[t],!this.borderDif)for(this.borderDif=[],i=[n.css("borderTopWidth"),n.css("borderRightWidth"),n.css("borderBottomWidth"),n.css("borderLeftWidth")],s=[n.css("paddingTop"),n.css("paddingRight"),n.css("paddingBottom"),n.css("paddingLeft")],e=0;i.length>e;e++)this.borderDif[e]=(parseInt(i[e],10)||0)+(parseInt(s[e],10)||0);n.css({height:o.height()-this.borderDif[0]-this.borderDif[2]||0,width:o.width()-this.borderDif[1]-this.borderDif[3]||0})}}},_renderProxy:function(){var e=this.element,i=this.options;this.elementOffset=e.offset(),this._helper?(this.helper=this.helper||t("<div style='overflow:hidden;'></div>"),this.helper.addClass(this._helper).css({width:this.element.outerWidth()-1,height:this.element.outerHeight()-1,position:"absolute",left:this.elementOffset.left+"px",top:this.elementOffset.top+"px",zIndex:++i.zIndex}),this.helper.appendTo("body").disableSelection()):this.helper=this.element},_change:{e:function(t,e){return{width:this.originalSize.width+e}},w:function(t,e){var i=this.originalSize,s=this.originalPosition;return{left:s.left+e,width:i.width-e}},n:function(t,e,i){var s=this.originalSize,n=this.originalPosition;return{top:n.top+i,height:s.height-i}},s:function(t,e,i){return{height:this.originalSize.height+i}},se:function(e,i,s){return t.extend(this._change.s.apply(this,arguments),this._change.e.apply(this,[e,i,s]))},sw:function(e,i,s){return t.extend(this._change.s.apply(this,arguments),this._change.w.apply(this,[e,i,s]))},ne:function(e,i,s){return t.extend(this._change.n.apply(this,arguments),this._change.e.apply(this,[e,i,s]))},nw:function(e,i,s){return t.extend(this._change.n.apply(this,arguments),this._change.w.apply(this,[e,i,s]))}},_propagate:function(e,i){t.ui.plugin.call(this,e,[i,this.ui()]),"resize"!==e&&this._trigger(e,i,this.ui())},plugins:{},ui:function(){return{originalElement:this.originalElement,element:this.element,helper:this.helper,position:this.position,size:this.size,originalSize:this.originalSize,originalPosition:this.originalPosition}}}),t.ui.plugin.add("resizable","animate",{stop:function(e){var i=t(this).data("ui-resizable"),s=i.options,n=i._proportionallyResizeElements,o=n.length&&/textarea/i.test(n[0].nodeName),a=o&&t.ui.hasScroll(n[0],"left")?0:i.sizeDiff.height,r=o?0:i.sizeDiff.width,h={width:i.size.width-r,height:i.size.height-a},l=parseInt(i.element.css("left"),10)+(i.position.left-i.originalPosition.left)||null,c=parseInt(i.element.css("top"),10)+(i.position.top-i.originalPosition.top)||null;i.element.animate(t.extend(h,c&&l?{top:c,left:l}:{}),{duration:s.animateDuration,easing:s.animateEasing,step:function(){var s={width:parseInt(i.element.css("width"),10),height:parseInt(i.element.css("height"),10),top:parseInt(i.element.css("top"),10),left:parseInt(i.element.css("left"),10)};n&&n.length&&t(n[0]).css({width:s.width,height:s.height}),i._updateCache(s),i._propagate("resize",e)}})}}),t.ui.plugin.add("resizable","containment",{start:function(){var i,s,n,o,a,r,h,l=t(this).data("ui-resizable"),c=l.options,u=l.element,d=c.containment,p=d instanceof t?d.get(0):/parent/.test(d)?u.parent().get(0):d;p&&(l.containerElement=t(p),/document/.test(d)||d===document?(l.containerOffset={left:0,top:0},l.containerPosition={left:0,top:0},l.parentData={element:t(document),left:0,top:0,width:t(document).width(),height:t(document).height()||document.body.parentNode.scrollHeight}):(i=t(p),s=[],t(["Top","Right","Left","Bottom"]).each(function(t,n){s[t]=e(i.css("padding"+n))}),l.containerOffset=i.offset(),l.containerPosition=i.position(),l.containerSize={height:i.innerHeight()-s[3],width:i.innerWidth()-s[1]},n=l.containerOffset,o=l.containerSize.height,a=l.containerSize.width,r=t.ui.hasScroll(p,"left")?p.scrollWidth:a,h=t.ui.hasScroll(p)?p.scrollHeight:o,l.parentData={element:p,left:n.left,top:n.top,width:r,height:h}))},resize:function(e){var 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s=t(this).data("ui-resizable"),n=s.options,o=s.originalSize,a=s.originalPosition,r={height:s.size.height-o.height||0,width:s.size.width-o.width||0,top:s.position.top-a.top||0,left:s.position.left-a.left||0},h=function(e,s){t(e).each(function(){var e=t(this),n=t(this).data("ui-resizable-alsoresize"),o={},a=s&&s.length?s:e.parents(i.originalElement[0]).length?["width","height"]:["width","height","top","left"];t.each(a,function(t,e){var i=(n[e]||0)+(r[e]||0);i&&i>=0&&(o[e]=i||null)}),e.css(o)})};"object"!=typeof n.alsoResize||n.alsoResize.nodeType?h(n.alsoResize):t.each(n.alsoResize,function(t,e){h(t,e)})},stop:function(){t(this).removeData("resizable-alsoresize")}}),t.ui.plugin.add("resizable","ghost",{start:function(){var e=t(this).data("ui-resizable"),i=e.options,s=e.size;e.ghost=e.originalElement.clone(),e.ghost.css({opacity:.25,display:"block",position:"relative",height:s.height,width:s.width,margin:0,left:0,top:0}).addClass("ui-resizable-ghost").addClass("string"==typeof i.ghost?i.ghost:""),e.ghost.appendTo(e.helper)},resize:function(){var e=t(this).data("ui-resizable");e.ghost&&e.ghost.css({position:"relative",height:e.size.height,width:e.size.width})},stop:function(){var e=t(this).data("ui-resizable");e.ghost&&e.helper&&e.helper.get(0).removeChild(e.ghost.get(0))}}),t.ui.plugin.add("resizable","grid",{resize:function(){var e=t(this).data("ui-resizable"),i=e.options,s=e.size,n=e.originalSize,o=e.originalPosition,a=e.axis,r="number"==typeof i.grid?[i.grid,i.grid]:i.grid,h=r[0]||1,l=r[1]||1,c=Math.round((s.width-n.width)/h)*h,u=Math.round((s.height-n.height)/l)*l,d=n.width+c,p=n.height+u,f=i.maxWidth&&d>i.maxWidth,g=i.maxHeight&&p>i.maxHeight,m=i.minWidth&&i.minWidth>d,v=i.minHeight&&i.minHeight>p;i.grid=r,m&&(d+=h),v&&(p+=l),f&&(d-=h),g&&(p-=l),/^(se|s|e)$/.test(a)?(e.size.width=d,e.size.height=p):/^(ne)$/.test(a)?(e.size.width=d,e.size.height=p,e.position.top=o.top-u):/^(sw)$/.test(a)?(e.size.width=d,e.size.height=p,e.position.left=o.left-c):(e.size.width=d,e.size.height=p,e.position.top=o.top-u,e.position.left=o.left-c)}})}(jQuery),function(t){t.widget("ui.selectable",t.ui.mouse,{version:"1.10.2",options:{appendTo:"body",autoRefresh:!0,distance:0,filter:"*",tolerance:"touch",selected:null,selecting:null,start:null,stop:null,unselected:null,unselecting:null},_create:function(){var e,i=this;this.element.addClass("ui-selectable"),this.dragged=!1,this.refresh=function(){e=t(i.options.filter,i.element[0]),e.addClass("ui-selectee"),e.each(function(){var e=t(this),i=e.offset();t.data(this,"selectable-item",{element:this,$element:e,left:i.left,top:i.top,right:i.left+e.outerWidth(),bottom:i.top+e.outerHeight(),startselected:!1,selected:e.hasClass("ui-selected"),selecting:e.hasClass("ui-selecting"),unselecting:e.hasClass("ui-unselecting")})})},this.refresh(),this.selectees=e.addClass("ui-selectee"),this._mouseInit(),this.helper=t("<div class='ui-selectable-helper'></div>")},_destroy:function(){this.selectees.removeClass("ui-selectee").removeData("selectable-item"),this.element.removeClass("ui-selectable ui-selectable-disabled"),this._mouseDestroy()},_mouseStart:function(e){var i=this,s=this.options;this.opos=[e.pageX,e.pageY],this.options.disabled||(this.selectees=t(s.filter,this.element[0]),this._trigger("start",e),t(s.appendTo).append(this.helper),this.helper.css({left:e.pageX,top:e.pageY,width:0,height:0}),s.autoRefresh&&this.refresh(),this.selectees.filter(".ui-selected").each(function(){var s=t.data(this,"selectable-item");s.startselected=!0,e.metaKey||e.ctrlKey||(s.$element.removeClass("ui-selected"),s.selected=!1,s.$element.addClass("ui-unselecting"),s.unselecting=!0,i._trigger("unselecting",e,{unselecting:s.element}))}),t(e.target).parents().addBack().each(function(){var s,n=t.data(this,"selectable-item");return n?(s=!e.metaKey&&!e.ctrlKey||!n.$element.hasClass("ui-selected"),n.$element.removeClass(s?"ui-unselecting":"ui-selected").addClass(s?"ui-selecting":"ui-unselecting"),n.unselecting=!s,n.selecting=s,n.selected=s,s?i._trigger("selecting",e,{selecting:n.element}):i._trigger("unselecting",e,{unselecting:n.element}),!1):undefined}))},_mouseDrag:function(e){if(this.dragged=!0,!this.options.disabled){var i,s=this,n=this.options,o=this.opos[0],a=this.opos[1],r=e.pageX,h=e.pageY;return o>r&&(i=r,r=o,o=i),a>h&&(i=h,h=a,a=i),this.helper.css({left:o,top:a,width:r-o,height:h-a}),this.selectees.each(function(){var i=t.data(this,"selectable-item"),l=!1;i&&i.element!==s.element[0]&&("touch"===n.tolerance?l=!(i.left>r||o>i.right||i.top>h||a>i.bottom):"fit"===n.tolerance&&(l=i.left>o&&r>i.right&&i.top>a&&h>i.bottom),l?(i.selected&&(i.$element.removeClass("ui-selected"),i.selected=!1),i.unselecting&&(i.$element.removeClass("ui-unselecting"),i.unselecting=!1),i.selecting||(i.$element.addClass("ui-selecting"),i.selecting=!0,s._trigger("selecting",e,{selecting:i.element}))):(i.selecting&&((e.metaKey||e.ctrlKey)&&i.startselected?(i.$element.removeClass("ui-selecting"),i.selecting=!1,i.$element.addClass("ui-selected"),i.selected=!0):(i.$element.removeClass("ui-selecting"),i.selecting=!1,i.startselected&&(i.$element.addClass("ui-unselecting"),i.unselecting=!0),s._trigger("unselecting",e,{unselecting:i.element}))),i.selected&&(e.metaKey||e.ctrlKey||i.startselected||(i.$element.removeClass("ui-selected"),i.selected=!1,i.$element.addClass("ui-unselecting"),i.unselecting=!0,s._trigger("unselecting",e,{unselecting:i.element})))))}),!1}},_mouseStop:function(e){var 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this.reverting?!1:this.options.disabled||"static"===this.options.type?!1:(this._refreshItems(e),t(e.target).parents().each(function(){return t.data(this,o.widgetName+"-item")===o?(s=t(this),!1):undefined}),t.data(e.target,o.widgetName+"-item")===o&&(s=t(e.target)),s?!this.options.handle||i||(t(this.options.handle,s).find("*").addBack().each(function(){this===e.target&&(n=!0)}),n)?(this.currentItem=s,this._removeCurrentsFromItems(),!0):!1:!1)},_mouseStart:function(e,i,s){var n,o,a=this.options;if(this.currentContainer=this,this.refreshPositions(),this.helper=this._createHelper(e),this._cacheHelperProportions(),this._cacheMargins(),this.scrollParent=this.helper.scrollParent(),this.offset=this.currentItem.offset(),this.offset={top:this.offset.top-this.margins.top,left:this.offset.left-this.margins.left},t.extend(this.offset,{click:{left:e.pageX-this.offset.left,top:e.pageY-this.offset.top},parent:this._getParentOffset(),relative:this._getRelativeOffset()}),this.helper.css("position","absolute"),this.cssPosition=this.helper.css("position"),this.originalPosition=this._generatePosition(e),this.originalPageX=e.pageX,this.originalPageY=e.pageY,a.cursorAt&&this._adjustOffsetFromHelper(a.cursorAt),this.domPosition={prev:this.currentItem.prev()[0],parent:this.currentItem.parent()[0]},this.helper[0]!==this.currentItem[0]&&this.currentItem.hide(),this._createPlaceholder(),a.containment&&this._setContainment(),a.cursor&&"auto"!==a.cursor&&(o=this.document.find("body"),this.storedCursor=o.css("cursor"),o.css("cursor",a.cursor),this.storedStylesheet=t("<style>*{ 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i,s,n,o,a=this.options,r=!1;for(this.position=this._generatePosition(e),this.positionAbs=this._convertPositionTo("absolute"),this.lastPositionAbs||(this.lastPositionAbs=this.positionAbs),this.options.scroll&&(this.scrollParent[0]!==document&&"HTML"!==this.scrollParent[0].tagName?(this.overflowOffset.top+this.scrollParent[0].offsetHeight-e.pageY<a.scrollSensitivity?this.scrollParent[0].scrollTop=r=this.scrollParent[0].scrollTop+a.scrollSpeed:e.pageY-this.overflowOffset.top<a.scrollSensitivity&&(this.scrollParent[0].scrollTop=r=this.scrollParent[0].scrollTop-a.scrollSpeed),this.overflowOffset.left+this.scrollParent[0].offsetWidth-e.pageX<a.scrollSensitivity?this.scrollParent[0].scrollLeft=r=this.scrollParent[0].scrollLeft+a.scrollSpeed:e.pageX-this.overflowOffset.left<a.scrollSensitivity&&(this.scrollParent[0].scrollLeft=r=this.scrollParent[0].scrollLeft-a.scrollSpeed)):(e.pageY-t(document).scrollTop()<a.scrollSensitivity?r=t(document).scrollTop(t(document).scrollTop()-a.scrollSpeed):t(window).height()-(e.pageY-t(document).scrollTop())<a.scrollSensitivity&&(r=t(document).scrollTop(t(document).scrollTop()+a.scrollSpeed)),e.pageX-t(document).scrollLeft()<a.scrollSensitivity?r=t(document).scrollLeft(t(document).scrollLeft()-a.scrollSpeed):t(window).width()-(e.pageX-t(document).scrollLeft())<a.scrollSensitivity&&(r=t(document).scrollLeft(t(document).scrollLeft()+a.scrollSpeed))),r!==!1&&t.ui.ddmanager&&!a.dropBehaviour&&t.ui.ddmanager.prepareOffsets(this,e)),this.positionAbs=this._convertPositionTo("absolute"),this.options.axis&&"y"===this.options.axis||(this.helper[0].style.left=this.position.left+"px"),this.options.axis&&"x"===this.options.axis||(this.helper[0].style.top=this.position.top+"px"),i=this.items.length-1;i>=0;i--)if(s=this.items[i],n=s.item[0],o=this._intersectsWithPointer(s),o&&s.instance===this.currentContainer&&n!==this.currentItem[0]&&this.placeholder[1===o?"next":"prev"]()[0]!==n&&!t.contains(this.placeholder[0],n)&&("semi-dynamic"===this.options.type?!t.contains(this.element[0],n):!0)){if(this.direction=1===o?"down":"up","pointer"!==this.options.tolerance&&!this._intersectsWithSides(s))break;this._rearrange(e,s),this._trigger("change",e,this._uiHash());break}return this._contactContainers(e),t.ui.ddmanager&&t.ui.ddmanager.drag(this,e),this._trigger("sort",e,this._uiHash()),this.lastPositionAbs=this.positionAbs,!1},_mouseStop:function(e,i){if(e){if(t.ui.ddmanager&&!this.options.dropBehaviour&&t.ui.ddmanager.drop(this,e),this.options.revert){var s=this,n=this.placeholder.offset(),o=this.options.axis,a={};o&&"x"!==o||(a.left=n.left-this.offset.parent.left-this.margins.left+(this.offsetParent[0]===document.body?0:this.offsetParent[0].scrollLeft)),o&&"y"!==o||(a.top=n.top-this.offset.parent.top-this.margins.top+(this.offsetParent[0]===document.body?0:this.offsetParent[0].scrollTop)),this.reverting=!0,t(this.helper).animate(a,parseInt(this.options.revert,10)||500,function(){s._clear(e)})}else this._clear(e,i);return!1}},cancel:function(){if(this.dragging){this._mouseUp({target:null}),"original"===this.options.helper?this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper"):this.currentItem.show();for(var e=this.containers.length-1;e>=0;e--)this.containers[e]._trigger("deactivate",null,this._uiHash(this)),this.containers[e].containerCache.over&&(this.containers[e]._trigger("out",null,this._uiHash(this)),this.containers[e].containerCache.over=0)}return this.placeholder&&(this.placeholder[0].parentNode&&this.placeholder[0].parentNode.removeChild(this.placeholder[0]),"original"!==this.options.helper&&this.helper&&this.helper[0].parentNode&&this.helper.remove(),t.extend(this,{helper:null,dragging:!1,reverting:!1,_noFinalSort:null}),this.domPosition.prev?t(this.domPosition.prev).after(this.currentItem):t(this.domPosition.parent).prepend(this.currentItem)),this},serialize:function(e){var i=this._getItemsAsjQuery(e&&e.connected),s=[];return e=e||{},t(i).each(function(){var i=(t(e.item||this).attr(e.attribute||"id")||"").match(e.expression||/(.+)[\-=_](.+)/);i&&s.push((e.key||i[1]+"[]")+"="+(e.key&&e.expression?i[1]:i[2]))}),!s.length&&e.key&&s.push(e.key+"="),s.join("&")},toArray:function(e){var i=this._getItemsAsjQuery(e&&e.connected),s=[];return e=e||{},i.each(function(){s.push(t(e.item||this).attr(e.attribute||"id")||"")}),s},_intersectsWith:function(t){var e=this.positionAbs.left,i=e+this.helperProportions.width,s=this.positionAbs.top,n=s+this.helperProportions.height,o=t.left,a=o+t.width,r=t.top,h=r+t.height,l=this.offset.click.top,c=this.offset.click.left,u=s+l>r&&h>s+l&&e+c>o&&a>e+c;return"pointer"===this.options.tolerance||this.options.forcePointerForContainers||"pointer"!==this.options.tolerance&&this.helperProportions[this.floating?"width":"height"]>t[this.floating?"width":"height"]?u:e+this.helperProportions.width/2>o&&a>i-this.helperProportions.width/2&&s+this.helperProportions.height/2>r&&h>n-this.helperProportions.height/2},_intersectsWithPointer:function(t){var i="x"===this.options.axis||e(this.positionAbs.top+this.offset.click.top,t.top,t.height),s="y"===this.options.axis||e(this.positionAbs.left+this.offset.click.left,t.left,t.width),n=i&&s,o=this._getDragVerticalDirection(),a=this._getDragHorizontalDirection();return n?this.floating?a&&"right"===a||"down"===o?2:1:o&&("down"===o?2:1):!1},_intersectsWithSides:function(t){var 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a=this,r=this.options,c="checkbox"===this.type||"radio"===this.type,u=c?"":"ui-state-active",d="ui-state-focus";null===r.label&&(r.label="input"===this.type?this.buttonElement.val():this.buttonElement.html()),this._hoverable(this.buttonElement),this.buttonElement.addClass(o).attr("role","button").bind("mouseenter"+this.eventNamespace,function(){r.disabled||this===e&&t(this).addClass("ui-state-active")}).bind("mouseleave"+this.eventNamespace,function(){r.disabled||t(this).removeClass(u)}).bind("click"+this.eventNamespace,function(t){r.disabled&&(t.preventDefault(),t.stopImmediatePropagation())}),this.element.bind("focus"+this.eventNamespace,function(){a.buttonElement.addClass(d)}).bind("blur"+this.eventNamespace,function(){a.buttonElement.removeClass(d)}),c&&(this.element.bind("change"+this.eventNamespace,function(){n||a.refresh()}),this.buttonElement.bind("mousedown"+this.eventNamespace,function(t){r.disabled||(n=!1,i=t.pageX,s=t.pageY)}).bind("mouseup"+this.eventNamespace,function(t){r.disabled||(i!==t.pageX||s!==t.pageY)&&(n=!0)})),"checkbox"===this.type?this.buttonElement.bind("click"+this.eventNamespace,function(){return 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:data(ui-button)"},_create:function(){this.element.addClass("ui-buttonset")},_init:function(){this.refresh()},_setOption:function(t,e){"disabled"===t&&this.buttons.button("option",t,e),this._super(t,e)},refresh:function(){var e="rtl"===this.element.css("direction");this.buttons=this.element.find(this.options.items).filter(":ui-button").button("refresh").end().not(":ui-button").button().end().map(function(){return t(this).button("widget")[0]}).removeClass("ui-corner-all ui-corner-left ui-corner-right").filter(":first").addClass(e?"ui-corner-right":"ui-corner-left").end().filter(":last").addClass(e?"ui-corner-left":"ui-corner-right").end().end()},_destroy:function(){this.element.removeClass("ui-buttonset"),this.buttons.map(function(){return t(this).button("widget")[0]}).removeClass("ui-corner-left ui-corner-right").end().button("destroy")}})}(jQuery),function(t,e){function i(){this._curInst=null,this._keyEvent=!1,this._disabledInputs=[],this._datepickerShowing=!1,this._inDialog=!1,this._mainDivId="ui-datepicker-div",this._inlineClass="ui-datepicker-inline",this._appendClass="ui-datepicker-append",this._triggerClass="ui-datepicker-trigger",this._dialogClass="ui-datepicker-dialog",this._disableClass="ui-datepicker-disabled",this._unselectableClass="ui-datepicker-unselectable",this._currentClass="ui-datepicker-current-day",this._dayOverClass="ui-datepicker-days-cell-over",this.regional=[],this.regional[""]={closeText:"Done",prevText:"Prev",nextText:"Next",currentText:"Today",monthNames:["January","February","March","April","May","June","July","August","September","October","November","December"],monthNamesShort:["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],dayNames:["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"],dayNamesShort:["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],dayNamesMin:["Su","Mo","Tu","We","Th","Fr","Sa"],weekHeader:"Wk",dateFormat:"mm/dd/yy",firstDay:0,isRTL:!1,showMonthAfterYear:!1,yearSuffix:""},this._defaults={showOn:"focus",showAnim:"fadeIn",showOptions:{},defaultDate:null,appendText:"",buttonText:"...",buttonImage:"",buttonImageOnly:!1,hideIfNoPrevNext:!1,navigationAsDateFormat:!1,gotoCurrent:!1,changeMonth:!1,changeYear:!1,yearRange:"c-10:c+10",showOtherMonths:!1,selectOtherMonths:!1,showWeek:!1,calculateWeek:this.iso8601Week,shortYearCutoff:"+10",minDate:null,maxDate:null,duration:"fast",beforeShowDay:null,beforeShow:null,onSelect:null,onChangeMonthYear:null,onClose:null,numberOfMonths:1,showCurrentAtPos:0,stepMonths:1,stepBigMonths:12,altField:"",altFormat:"",constrainInput:!0,showButtonPanel:!1,autoSize:!1,disabled:!1},t.extend(this._defaults,this.regional[""]),this.dpDiv=s(t("<div id='"+this._mainDivId+"' class='ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all'></div>"))}function s(e){var i="button, .ui-datepicker-prev, .ui-datepicker-next, .ui-datepicker-calendar td a";return e.delegate(i,"mouseout",function(){t(this).removeClass("ui-state-hover"),-1!==this.className.indexOf("ui-datepicker-prev")&&t(this).removeClass("ui-datepicker-prev-hover"),-1!==this.className.indexOf("ui-datepicker-next")&&t(this).removeClass("ui-datepicker-next-hover")}).delegate(i,"mouseover",function(){t.datepicker._isDisabledDatepicker(o.inline?e.parent()[0]:o.input[0])||(t(this).parents(".ui-datepicker-calendar").find("a").removeClass("ui-state-hover"),t(this).addClass("ui-state-hover"),-1!==this.className.indexOf("ui-datepicker-prev")&&t(this).addClass("ui-datepicker-prev-hover"),-1!==this.className.indexOf("ui-datepicker-next")&&t(this).addClass("ui-datepicker-next-hover"))})}function n(e,i){t.extend(e,i);for(var s in i)null==i[s]&&(e[s]=i[s]);return e}t.extend(t.ui,{datepicker:{version:"1.10.2"}});var o,a="datepicker",r=(new Date).getTime();t.extend(i.prototype,{markerClassName:"hasDatepicker",maxRows:4,_widgetDatepicker:function(){return this.dpDiv},setDefaults:function(t){return n(this._defaults,t||{}),this},_attachDatepicker:function(e,i){var s,n,o;s=e.nodeName.toLowerCase(),n="div"===s||"span"===s,e.id||(this.uuid+=1,e.id="dp"+this.uuid),o=this._newInst(t(e),n),o.settings=t.extend({},i||{}),"input"===s?this._connectDatepicker(e,o):n&&this._inlineDatepicker(e,o)},_newInst:function(e,i){var n=e[0].id.replace(/([^A-Za-z0-9_\-])/g,"\\\\$1");return{id:n,input:e,selectedDay:0,selectedMonth:0,selectedYear:0,drawMonth:0,drawYear:0,inline:i,dpDiv:i?s(t("<div class='"+this._inlineClass+" ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all'></div>")):this.dpDiv}},_connectDatepicker:function(e,i){var s=t(e);i.append=t([]),i.trigger=t([]),s.hasClass(this.markerClassName)||(this._attachments(s,i),s.addClass(this.markerClassName).keydown(this._doKeyDown).keypress(this._doKeyPress).keyup(this._doKeyUp),this._autoSize(i),t.data(e,a,i),i.settings.disabled&&this._disableDatepicker(e))},_attachments:function(e,i){var s,n,o,a=this._get(i,"appendText"),r=this._get(i,"isRTL");i.append&&i.append.remove(),a&&(i.append=t("<span class='"+this._appendClass+"'>"+a+"</span>"),e[r?"before":"after"](i.append)),e.unbind("focus",this._showDatepicker),i.trigger&&i.trigger.remove(),s=this._get(i,"showOn"),("focus"===s||"both"===s)&&e.focus(this._showDatepicker),("button"===s||"both"===s)&&(n=this._get(i,"buttonText"),o=this._get(i,"buttonImage"),i.trigger=t(this._get(i,"buttonImageOnly")?t("<img/>").addClass(this._triggerClass).attr({src:o,alt:n,title:n}):t("<button type='button'></button>").addClass(this._triggerClass).html(o?t("<img/>").attr({src:o,alt:n,title:n}):n)),e[r?"before":"after"](i.trigger),i.trigger.click(function(){return t.datepicker._datepickerShowing&&t.datepicker._lastInput===e[0]?t.datepicker._hideDatepicker():t.datepicker._datepickerShowing&&t.datepicker._lastInput!==e[0]?(t.datepicker._hideDatepicker(),t.datepicker._showDatepicker(e[0])):t.datepicker._showDatepicker(e[0]),!1}))},_autoSize:function(t){if(this._get(t,"autoSize")&&!t.inline){var e,i,s,n,o=new Date(2009,11,20),a=this._get(t,"dateFormat");a.match(/[DM]/)&&(e=function(t){for(i=0,s=0,n=0;t.length>n;n++)t[n].length>i&&(i=t[n].length,s=n);return s},o.setMonth(e(this._get(t,a.match(/MM/)?"monthNames":"monthNamesShort"))),o.setDate(e(this._get(t,a.match(/DD/)?"dayNames":"dayNamesShort"))+20-o.getDay())),t.input.attr("size",this._formatDate(t,o).length)}},_inlineDatepicker:function(e,i){var s=t(e);s.hasClass(this.markerClassName)||(s.addClass(this.markerClassName).append(i.dpDiv),t.data(e,a,i),this._setDate(i,this._getDefaultDate(i),!0),this._updateDatepicker(i),this._updateAlternate(i),i.settings.disabled&&this._disableDatepicker(e),i.dpDiv.css("display","block"))},_dialogDatepicker:function(e,i,s,o,r){var h,l,c,u,d,p=this._dialogInst;return p||(this.uuid+=1,h="dp"+this.uuid,this._dialogInput=t("<input type='text' id='"+h+"' style='position: absolute; top: -100px; width: 0px;'/>"),this._dialogInput.keydown(this._doKeyDown),t("body").append(this._dialogInput),p=this._dialogInst=this._newInst(this._dialogInput,!1),p.settings={},t.data(this._dialogInput[0],a,p)),n(p.settings,o||{}),i=i&&i.constructor===Date?this._formatDate(p,i):i,this._dialogInput.val(i),this._pos=r?r.length?r:[r.pageX,r.pageY]:null,this._pos||(l=document.documentElement.clientWidth,c=document.documentElement.clientHeight,u=document.documentElement.scrollLeft||document.body.scrollLeft,d=document.documentElement.scrollTop||document.body.scrollTop,this._pos=[l/2-100+u,c/2-150+d]),this._dialogInput.css("left",this._pos[0]+20+"px").css("top",this._pos[1]+"px"),p.settings.onSelect=s,this._inDialog=!0,this.dpDiv.addClass(this._dialogClass),this._showDatepicker(this._dialogInput[0]),t.blockUI&&t.blockUI(this.dpDiv),t.data(this._dialogInput[0],a,p),this},_destroyDatepicker:function(e){var i,s=t(e),n=t.data(e,a);s.hasClass(this.markerClassName)&&(i=e.nodeName.toLowerCase(),t.removeData(e,a),"input"===i?(n.append.remove(),n.trigger.remove(),s.removeClass(this.markerClassName).unbind("focus",this._showDatepicker).unbind("keydown",this._doKeyDown).unbind("keypress",this._doKeyPress).unbind("keyup",this._doKeyUp)):("div"===i||"span"===i)&&s.removeClass(this.markerClassName).empty())},_enableDatepicker:function(e){var i,s,n=t(e),o=t.data(e,a);n.hasClass(this.markerClassName)&&(i=e.nodeName.toLowerCase(),"input"===i?(e.disabled=!1,o.trigger.filter("button").each(function(){this.disabled=!1}).end().filter("img").css({opacity:"1.0",cursor:""})):("div"===i||"span"===i)&&(s=n.children("."+this._inlineClass),s.children().removeClass("ui-state-disabled"),s.find("select.ui-datepicker-month, select.ui-datepicker-year").prop("disabled",!1)),this._disabledInputs=t.map(this._disabledInputs,function(t){return t===e?null:t}))},_disableDatepicker:function(e){var i,s,n=t(e),o=t.data(e,a);n.hasClass(this.markerClassName)&&(i=e.nodeName.toLowerCase(),"input"===i?(e.disabled=!0,o.trigger.filter("button").each(function(){this.disabled=!0}).end().filter("img").css({opacity:"0.5",cursor:"default"})):("div"===i||"span"===i)&&(s=n.children("."+this._inlineClass),s.children().addClass("ui-state-disabled"),s.find("select.ui-datepicker-month, select.ui-datepicker-year").prop("disabled",!0)),this._disabledInputs=t.map(this._disabledInputs,function(t){return t===e?null:t}),this._disabledInputs[this._disabledInputs.length]=e)},_isDisabledDatepicker:function(t){if(!t)return!1;for(var e=0;this._disabledInputs.length>e;e++)if(this._disabledInputs[e]===t)return!0;return!1},_getInst:function(e){try{return t.data(e,a)}catch(i){throw"Missing instance data for this datepicker"}},_optionDatepicker:function(i,s,o){var a,r,h,l,c=this._getInst(i);return 2===arguments.length&&"string"==typeof s?"defaults"===s?t.extend({},t.datepicker._defaults):c?"all"===s?t.extend({},c.settings):this._get(c,s):null:(a=s||{},"string"==typeof s&&(a={},a[s]=o),c&&(this._curInst===c&&this._hideDatepicker(),r=this._getDateDatepicker(i,!0),h=this._getMinMaxDate(c,"min"),l=this._getMinMaxDate(c,"max"),n(c.settings,a),null!==h&&a.dateFormat!==e&&a.minDate===e&&(c.settings.minDate=this._formatDate(c,h)),null!==l&&a.dateFormat!==e&&a.maxDate===e&&(c.settings.maxDate=this._formatDate(c,l)),"disabled"in a&&(a.disabled?this._disableDatepicker(i):this._enableDatepicker(i)),this._attachments(t(i),c),this._autoSize(c),this._setDate(c,r),this._updateAlternate(c),this._updateDatepicker(c)),e)},_changeDatepicker:function(t,e,i){this._optionDatepicker(t,e,i)},_refreshDatepicker:function(t){var e=this._getInst(t);e&&this._updateDatepicker(e)},_setDateDatepicker:function(t,e){var i=this._getInst(t);i&&(this._setDate(i,e),this._updateDatepicker(i),this._updateAlternate(i))},_getDateDatepicker:function(t,e){var i=this._getInst(t);return i&&!i.inline&&this._setDateFromField(i,e),i?this._getDate(i):null},_doKeyDown:function(e){var i,s,n,o=t.datepicker._getInst(e.target),a=!0,r=o.dpDiv.is(".ui-datepicker-rtl");if(o._keyEvent=!0,t.datepicker._datepickerShowing)switch(e.keyCode){case 9:t.datepicker._hideDatepicker(),a=!1;break;case 13:return n=t("td."+t.datepicker._dayOverClass+":not(."+t.datepicker._currentClass+")",o.dpDiv),n[0]&&t.datepicker._selectDay(e.target,o.selectedMonth,o.selectedYear,n[0]),i=t.datepicker._get(o,"onSelect"),i?(s=t.datepicker._formatDate(o),i.apply(o.input?o.input[0]:null,[s,o])):t.datepicker._hideDatepicker(),!1;case 27:t.datepicker._hideDatepicker();break;case 33:t.datepicker._adjustDate(e.target,e.ctrlKey?-t.datepicker._get(o,"stepBigMonths"):-t.datepicker._get(o,"stepMonths"),"M");break;case 34:t.datepicker._adjustDate(e.target,e.ctrlKey?+t.datepicker._get(o,"stepBigMonths"):+t.datepicker._get(o,"stepMonths"),"M");break;case 35:(e.ctrlKey||e.metaKey)&&t.datepicker._clearDate(e.target),a=e.ctrlKey||e.metaKey;break;case 36:(e.ctrlKey||e.metaKey)&&t.datepicker._gotoToday(e.target),a=e.ctrlKey||e.metaKey;break;case 37:(e.ctrlKey||e.metaKey)&&t.datepicker._adjustDate(e.target,r?1:-1,"D"),a=e.ctrlKey||e.metaKey,e.originalEvent.altKey&&t.datepicker._adjustDate(e.target,e.ctrlKey?-t.datepicker._get(o,"stepBigMonths"):-t.datepicker._get(o,"stepMonths"),"M");break;case 38:(e.ctrlKey||e.metaKey)&&t.datepicker._adjustDate(e.target,-7,"D"),a=e.ctrlKey||e.metaKey;break;case 39:(e.ctrlKey||e.metaKey)&&t.datepicker._adjustDate(e.target,r?-1:1,"D"),a=e.ctrlKey||e.metaKey,e.originalEvent.altKey&&t.datepicker._adjustDate(e.target,e.ctrlKey?+t.datepicker._get(o,"stepBigMonths"):+t.datepicker._get(o,"stepMonths"),"M");break;case 40:(e.ctrlKey||e.metaKey)&&t.datepicker._adjustDate(e.target,7,"D"),a=e.ctrlKey||e.metaKey;break;default:a=!1}else 36===e.keyCode&&e.ctrlKey?t.datepicker._showDatepicker(this):a=!1;a&&(e.preventDefault(),e.stopPropagation())},_doKeyPress:function(i){var s,n,o=t.datepicker._getInst(i.target);return t.datepicker._get(o,"constrainInput")?(s=t.datepicker._possibleChars(t.datepicker._get(o,"dateFormat")),n=String.fromCharCode(null==i.charCode?i.keyCode:i.charCode),i.ctrlKey||i.metaKey||" ">n||!s||s.indexOf(n)>-1):e},_doKeyUp:function(e){var i,s=t.datepicker._getInst(e.target);if(s.input.val()!==s.lastVal)try{i=t.datepicker.parseDate(t.datepicker._get(s,"dateFormat"),s.input?s.input.val():null,t.datepicker._getFormatConfig(s)),i&&(t.datepicker._setDateFromField(s),t.datepicker._updateAlternate(s),t.datepicker._updateDatepicker(s))}catch(n){}return!0},_showDatepicker:function(e){if(e=e.target||e,"input"!==e.nodeName.toLowerCase()&&(e=t("input",e.parentNode)[0]),!t.datepicker._isDisabledDatepicker(e)&&t.datepicker._lastInput!==e){var i,s,o,a,r,h,l;i=t.datepicker._getInst(e),t.datepicker._curInst&&t.datepicker._curInst!==i&&(t.datepicker._curInst.dpDiv.stop(!0,!0),i&&t.datepicker._datepickerShowing&&t.datepicker._hideDatepicker(t.datepicker._curInst.input[0])),s=t.datepicker._get(i,"beforeShow"),o=s?s.apply(e,[e,i]):{},o!==!1&&(n(i.settings,o),i.lastVal=null,t.datepicker._lastInput=e,t.datepicker._setDateFromField(i),t.datepicker._inDialog&&(e.value=""),t.datepicker._pos||(t.datepicker._pos=t.datepicker._findPos(e),t.datepicker._pos[1]+=e.offsetHeight),a=!1,t(e).parents().each(function(){return a|="fixed"===t(this).css("position"),!a}),r={left:t.datepicker._pos[0],top:t.datepicker._pos[1]},t.datepicker._pos=null,i.dpDiv.empty(),i.dpDiv.css({position:"absolute",display:"block",top:"-1000px"}),t.datepicker._updateDatepicker(i),r=t.datepicker._checkOffset(i,r,a),i.dpDiv.css({position:t.datepicker._inDialog&&t.blockUI?"static":a?"fixed":"absolute",display:"none",left:r.left+"px",top:r.top+"px"}),i.inline||(h=t.datepicker._get(i,"showAnim"),l=t.datepicker._get(i,"duration"),i.dpDiv.zIndex(t(e).zIndex()+1),t.datepicker._datepickerShowing=!0,t.effects&&t.effects.effect[h]?i.dpDiv.show(h,t.datepicker._get(i,"showOptions"),l):i.dpDiv[h||"show"](h?l:null),i.input.is(":visible")&&!i.input.is(":disabled")&&i.input.focus(),t.datepicker._curInst=i))}},_updateDatepicker:function(e){this.maxRows=4,o=e,e.dpDiv.empty().append(this._generateHTML(e)),this._attachHandlers(e),e.dpDiv.find("."+this._dayOverClass+" a").mouseover();var i,s=this._getNumberOfMonths(e),n=s[1],a=17;e.dpDiv.removeClass("ui-datepicker-multi-2 ui-datepicker-multi-3 ui-datepicker-multi-4").width(""),n>1&&e.dpDiv.addClass("ui-datepicker-multi-"+n).css("width",a*n+"em"),e.dpDiv[(1!==s[0]||1!==s[1]?"add":"remove")+"Class"]("ui-datepicker-multi"),e.dpDiv[(this._get(e,"isRTL")?"add":"remove")+"Class"]("ui-datepicker-rtl"),e===t.datepicker._curInst&&t.datepicker._datepickerShowing&&e.input&&e.input.is(":visible")&&!e.input.is(":disabled")&&e.input[0]!==document.activeElement&&e.input.focus(),e.yearshtml&&(i=e.yearshtml,setTimeout(function(){i===e.yearshtml&&e.yearshtml&&e.dpDiv.find("select.ui-datepicker-year:first").replaceWith(e.yearshtml),i=e.yearshtml=null},0))},_getBorders:function(t){var e=function(t){return{thin:1,medium:2,thick:3}[t]||t};return[parseFloat(e(t.css("border-left-width"))),parseFloat(e(t.css("border-top-width")))]},_checkOffset:function(e,i,s){var n=e.dpDiv.outerWidth(),o=e.dpDiv.outerHeight(),a=e.input?e.input.outerWidth():0,r=e.input?e.input.outerHeight():0,h=document.documentElement.clientWidth+(s?0:t(document).scrollLeft()),l=document.documentElement.clientHeight+(s?0:t(document).scrollTop());return i.left-=this._get(e,"isRTL")?n-a:0,i.left-=s&&i.left===e.input.offset().left?t(document).scrollLeft():0,i.top-=s&&i.top===e.input.offset().top+r?t(document).scrollTop():0,i.left-=Math.min(i.left,i.left+n>h&&h>n?Math.abs(i.left+n-h):0),i.top-=Math.min(i.top,i.top+o>l&&l>o?Math.abs(o+r):0),i},_findPos:function(e){for(var i,s=this._getInst(e),n=this._get(s,"isRTL");e&&("hidden"===e.type||1!==e.nodeType||t.expr.filters.hidden(e));)e=e[n?"previousSibling":"nextSibling"];return i=t(e).offset(),[i.left,i.top]},_hideDatepicker:function(e){var i,s,n,o,r=this._curInst;!r||e&&r!==t.data(e,a)||this._datepickerShowing&&(i=this._get(r,"showAnim"),s=this._get(r,"duration"),n=function(){t.datepicker._tidyDialog(r)},t.effects&&(t.effects.effect[i]||t.effects[i])?r.dpDiv.hide(i,t.datepicker._get(r,"showOptions"),s,n):r.dpDiv["slideDown"===i?"slideUp":"fadeIn"===i?"fadeOut":"hide"](i?s:null,n),i||n(),this._datepickerShowing=!1,o=this._get(r,"onClose"),o&&o.apply(r.input?r.input[0]:null,[r.input?r.input.val():"",r]),this._lastInput=null,this._inDialog&&(this._dialogInput.css({position:"absolute",left:"0",top:"-100px"}),t.blockUI&&(t.unblockUI(),t("body").append(this.dpDiv))),this._inDialog=!1)},_tidyDialog:function(t){t.dpDiv.removeClass(this._dialogClass).unbind(".ui-datepicker-calendar")},_checkExternalClick:function(e){if(t.datepicker._curInst){var i=t(e.target),s=t.datepicker._getInst(i[0]);(i[0].id!==t.datepicker._mainDivId&&0===i.parents("#"+t.datepicker._mainDivId).length&&!i.hasClass(t.datepicker.markerClassName)&&!i.closest("."+t.datepicker._triggerClass).length&&t.datepicker._datepickerShowing&&(!t.datepicker._inDialog||!t.blockUI)||i.hasClass(t.datepicker.markerClassName)&&t.datepicker._curInst!==s)&&t.datepicker._hideDatepicker()}},_adjustDate:function(e,i,s){var n=t(e),o=this._getInst(n[0]);this._isDisabledDatepicker(n[0])||(this._adjustInstDate(o,i+("M"===s?this._get(o,"showCurrentAtPos"):0),s),this._updateDatepicker(o))},_gotoToday:function(e){var i,s=t(e),n=this._getInst(s[0]);this._get(n,"gotoCurrent")&&n.currentDay?(n.selectedDay=n.currentDay,n.drawMonth=n.selectedMonth=n.currentMonth,n.drawYear=n.selectedYear=n.currentYear):(i=new Date,n.selectedDay=i.getDate(),n.drawMonth=n.selectedMonth=i.getMonth(),n.drawYear=n.selectedYear=i.getFullYear()),this._notifyChange(n),this._adjustDate(s)},_selectMonthYear:function(e,i,s){var n=t(e),o=this._getInst(n[0]);o["selected"+("M"===s?"Month":"Year")]=o["draw"+("M"===s?"Month":"Year")]=parseInt(i.options[i.selectedIndex].value,10),this._notifyChange(o),this._adjustDate(n)},_selectDay:function(e,i,s,n){var o,a=t(e);t(n).hasClass(this._unselectableClass)||this._isDisabledDatepicker(a[0])||(o=this._getInst(a[0]),o.selectedDay=o.currentDay=t("a",n).html(),o.selectedMonth=o.currentMonth=i,o.selectedYear=o.currentYear=s,this._selectDate(e,this._formatDate(o,o.currentDay,o.currentMonth,o.currentYear)))},_clearDate:function(e){var i=t(e);this._selectDate(i,"")},_selectDate:function(e,i){var s,n=t(e),o=this._getInst(n[0]);i=null!=i?i:this._formatDate(o),o.input&&o.input.val(i),this._updateAlternate(o),s=this._get(o,"onSelect"),s?s.apply(o.input?o.input[0]:null,[i,o]):o.input&&o.input.trigger("change"),o.inline?this._updateDatepicker(o):(this._hideDatepicker(),this._lastInput=o.input[0],"object"!=typeof o.input[0]&&o.input.focus(),this._lastInput=null)},_updateAlternate:function(e){var i,s,n,o=this._get(e,"altField");o&&(i=this._get(e,"altFormat")||this._get(e,"dateFormat"),s=this._getDate(e),n=this.formatDate(i,s,this._getFormatConfig(e)),t(o).each(function(){t(this).val(n)}))},noWeekends:function(t){var e=t.getDay();return[e>0&&6>e,""]},iso8601Week:function(t){var e,i=new Date(t.getTime());return i.setDate(i.getDate()+4-(i.getDay()||7)),e=i.getTime(),i.setMonth(0),i.setDate(1),Math.floor(Math.round((e-i)/864e5)/7)+1},parseDate:function(i,s,n){if(null==i||null==s)throw"Invalid arguments";if(s="object"==typeof s?""+s:s+"",""===s)return null;var o,a,r,h,l=0,c=(n?n.shortYearCutoff:null)||this._defaults.shortYearCutoff,u="string"!=typeof c?c:(new Date).getFullYear()%100+parseInt(c,10),d=(n?n.dayNamesShort:null)||this._defaults.dayNamesShort,p=(n?n.dayNames:null)||this._defaults.dayNames,f=(n?n.monthNamesShort:null)||this._defaults.monthNamesShort,g=(n?n.monthNames:null)||this._defaults.monthNames,m=-1,v=-1,_=-1,b=-1,y=!1,w=function(t){var e=i.length>o+1&&i.charAt(o+1)===t;return e&&o++,e},k=function(t){var e=w(t),i="@"===t?14:"!"===t?20:"y"===t&&e?4:"o"===t?3:2,n=RegExp("^\\d{1,"+i+"}"),o=s.substring(l).match(n);if(!o)throw"Missing number at position "+l;return l+=o[0].length,parseInt(o[0],10)},x=function(i,n,o){var a=-1,r=t.map(w(i)?o:n,function(t,e){return[[e,t]]}).sort(function(t,e){return-(t[1].length-e[1].length)});if(t.each(r,function(t,i){var n=i[1];return s.substr(l,n.length).toLowerCase()===n.toLowerCase()?(a=i[0],l+=n.length,!1):e}),-1!==a)return a+1;throw"Unknown name at position "+l},D=function(){if(s.charAt(l)!==i.charAt(o))throw"Unexpected literal at position "+l;l++};for(o=0;i.length>o;o++)if(y)"'"!==i.charAt(o)||w("'")?D():y=!1;else switch(i.charAt(o)){case"d":_=k("d");break;case"D":x("D",d,p);break;case"o":b=k("o");break;case"m":v=k("m");break;case"M":v=x("M",f,g);break;case"y":m=k("y");break;case"@":h=new Date(k("@")),m=h.getFullYear(),v=h.getMonth()+1,_=h.getDate();break;case"!":h=new Date((k("!")-this._ticksTo1970)/1e4),m=h.getFullYear(),v=h.getMonth()+1,_=h.getDate();break;case"'":w("'")?D():y=!0;break;default:D()}if(s.length>l&&(r=s.substr(l),!/^\s+/.test(r)))throw"Extra/unparsed characters found in date: "+r;if(-1===m?m=(new Date).getFullYear():100>m&&(m+=(new Date).getFullYear()-(new Date).getFullYear()%100+(u>=m?0:-100)),b>-1)for(v=1,_=b;;){if(a=this._getDaysInMonth(m,v-1),a>=_)break;v++,_-=a}if(h=this._daylightSavingAdjust(new Date(m,v-1,_)),h.getFullYear()!==m||h.getMonth()+1!==v||h.getDate()!==_)throw"Invalid date";return h},ATOM:"yy-mm-dd",COOKIE:"D, dd M yy",ISO_8601:"yy-mm-dd",RFC_822:"D, d M y",RFC_850:"DD, dd-M-y",RFC_1036:"D, d M y",RFC_1123:"D, d M yy",RFC_2822:"D, d M yy",RSS:"D, d M y",TICKS:"!",TIMESTAMP:"@",W3C:"yy-mm-dd",_ticksTo1970:1e7*60*60*24*(718685+Math.floor(492.5)-Math.floor(19.7)+Math.floor(4.925)),formatDate:function(t,e,i){if(!e)return"";var s,n=(i?i.dayNamesShort:null)||this._defaults.dayNamesShort,o=(i?i.dayNames:null)||this._defaults.dayNames,a=(i?i.monthNamesShort:null)||this._defaults.monthNamesShort,r=(i?i.monthNames:null)||this._defaults.monthNames,h=function(e){var i=t.length>s+1&&t.charAt(s+1)===e;return i&&s++,i},l=function(t,e,i){var s=""+e;if(h(t))for(;i>s.length;)s="0"+s;return s},c=function(t,e,i,s){return h(t)?s[e]:i[e]},u="",d=!1;if(e)for(s=0;t.length>s;s++)if(d)"'"!==t.charAt(s)||h("'")?u+=t.charAt(s):d=!1;else switch(t.charAt(s)){case"d":u+=l("d",e.getDate(),2);break;case"D":u+=c("D",e.getDay(),n,o);break;case"o":u+=l("o",Math.round((new Date(e.getFullYear(),e.getMonth(),e.getDate()).getTime()-new Date(e.getFullYear(),0,0).getTime())/864e5),3);break;case"m":u+=l("m",e.getMonth()+1,2);break;case"M":u+=c("M",e.getMonth(),a,r);break;case"y":u+=h("y")?e.getFullYear():(10>e.getYear()%100?"0":"")+e.getYear()%100;break;case"@":u+=e.getTime();break;case"!":u+=1e4*e.getTime()+this._ticksTo1970;break;case"'":h("'")?u+="'":d=!0;break;default:u+=t.charAt(s)}return u},_possibleChars:function(t){var e,i="",s=!1,n=function(i){var s=t.length>e+1&&t.charAt(e+1)===i;return s&&e++,s};for(e=0;t.length>e;e++)if(s)"'"!==t.charAt(e)||n("'")?i+=t.charAt(e):s=!1;else switch(t.charAt(e)){case"d":case"m":case"y":case"@":i+="0123456789";break;case"D":case"M":return null;case"'":n("'")?i+="'":s=!0;break;default:i+=t.charAt(e)}return i},_get:function(t,i){return t.settings[i]!==e?t.settings[i]:this._defaults[i]},_setDateFromField:function(t,e){if(t.input.val()!==t.lastVal){var i=this._get(t,"dateFormat"),s=t.lastVal=t.input?t.input.val():null,n=this._getDefaultDate(t),o=n,a=this._getFormatConfig(t);try{o=this.parseDate(i,s,a)||n}catch(r){s=e?"":s}t.selectedDay=o.getDate(),t.drawMonth=t.selectedMonth=o.getMonth(),t.drawYear=t.selectedYear=o.getFullYear(),t.currentDay=s?o.getDate():0,t.currentMonth=s?o.getMonth():0,t.currentYear=s?o.getFullYear():0,this._adjustInstDate(t)}},_getDefaultDate:function(t){return this._restrictMinMax(t,this._determineDate(t,this._get(t,"defaultDate"),new Date))},_determineDate:function(e,i,s){var n=function(t){var e=new Date;return e.setDate(e.getDate()+t),e},o=function(i){try{return t.datepicker.parseDate(t.datepicker._get(e,"dateFormat"),i,t.datepicker._getFormatConfig(e))}catch(s){}for(var n=(i.toLowerCase().match(/^c/)?t.datepicker._getDate(e):null)||new 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class='ui-datepicker-next ui-corner-all' data-handler='next' data-event='click' title='"+n+"'><span class='ui-icon ui-icon-circle-triangle-"+(Y?"w":"e")+"'>"+n+"</span></a>":V?"":"<a class='ui-datepicker-next ui-corner-all ui-state-disabled' title='"+n+"'><span class='ui-icon ui-icon-circle-triangle-"+(Y?"w":"e")+"'>"+n+"</span></a>",a=this._get(t,"currentText"),r=this._get(t,"gotoCurrent")&&t.currentDay?$:L,a=K?this.formatDate(a,r,this._getFormatConfig(t)):a,h=t.inline?"":"<button type='button' class='ui-datepicker-close ui-state-default ui-priority-primary ui-corner-all' data-handler='hide' data-event='click'>"+this._get(t,"closeText")+"</button>",l=B?"<div class='ui-datepicker-buttonpane ui-widget-content'>"+(Y?h:"")+(this._isInRange(t,r)?"<button type='button' class='ui-datepicker-current ui-state-default ui-priority-secondary ui-corner-all' data-handler='today' 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ui-helper-clearfix"+I+"'>"+(/all|left/.test(I)&&0===k?Y?o:s:"")+(/all|right/.test(I)&&0===k?Y?s:o:"")+this._generateMonthYearHeader(t,Z,te,G,J,k>0||D>0,f,g)+"</div><table class='ui-datepicker-calendar'><thead>"+"<tr>",T=u?"<th class='ui-datepicker-week-col'>"+this._get(t,"weekHeader")+"</th>":"",w=0;7>w;w++)M=(w+c)%7,T+="<th"+((w+c+6)%7>=5?" class='ui-datepicker-week-end'":"")+">"+"<span title='"+d[M]+"'>"+p[M]+"</span></th>";for(P+=T+"</tr></thead><tbody>",S=this._getDaysInMonth(te,Z),te===t.selectedYear&&Z===t.selectedMonth&&(t.selectedDay=Math.min(t.selectedDay,S)),z=(this._getFirstDayOfMonth(te,Z)-c+7)%7,A=Math.ceil((z+S)/7),H=X?this.maxRows>A?this.maxRows:A:A,this.maxRows=H,N=this._daylightSavingAdjust(new Date(te,Z,1-z)),E=0;H>E;E++){for(P+="<tr>",W=u?"<td class='ui-datepicker-week-col'>"+this._get(t,"calculateWeek")(N)+"</td>":"",w=0;7>w;w++)O=m?m.apply(t.input?t.input[0]:null,[N]):[!0,""],F=N.getMonth()!==Z,R=F&&!_||!O[0]||G&&G>N||J&&N>J,W+="<td class='"+((w+c+6)%7>=5?" ui-datepicker-week-end":"")+(F?" ui-datepicker-other-month":"")+(N.getTime()===C.getTime()&&Z===t.selectedMonth&&t._keyEvent||b.getTime()===N.getTime()&&b.getTime()===C.getTime()?" 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class='ui-datepicker-title'>",y="";if(o||!m)y+="<span class='ui-datepicker-month'>"+a[e]+"</span>";else{for(h=s&&s.getFullYear()===i,l=n&&n.getFullYear()===i,y+="<select class='ui-datepicker-month' data-handler='selectMonth' data-event='change'>",c=0;12>c;c++)(!h||c>=s.getMonth())&&(!l||n.getMonth()>=c)&&(y+="<option value='"+c+"'"+(c===e?" selected='selected'":"")+">"+r[c]+"</option>");y+="</select>"}if(_||(b+=y+(!o&&m&&v?"":"&#xa0;")),!t.yearshtml)if(t.yearshtml="",o||!v)b+="<span class='ui-datepicker-year'>"+i+"</span>";else{for(u=this._get(t,"yearRange").split(":"),d=(new Date).getFullYear(),p=function(t){var e=t.match(/c[+\-].*/)?i+parseInt(t.substring(1),10):t.match(/[+\-].*/)?d+parseInt(t,10):parseInt(t,10);return isNaN(e)?d:e},f=p(u[0]),g=Math.max(f,p(u[1]||"")),f=s?Math.max(f,s.getFullYear()):f,g=n?Math.min(g,n.getFullYear()):g,t.yearshtml+="<select class='ui-datepicker-year' data-handler='selectYear' data-event='change'>";g>=f;f++)t.yearshtml+="<option value='"+f+"'"+(f===i?" selected='selected'":"")+">"+f+"</option>";t.yearshtml+="</select>",b+=t.yearshtml,t.yearshtml=null}return b+=this._get(t,"yearSuffix"),_&&(b+=(!o&&m&&v?"":"&#xa0;")+y),b+="</div>"},_adjustInstDate:function(t,e,i){var s=t.drawYear+("Y"===i?e:0),n=t.drawMonth+("M"===i?e:0),o=Math.min(t.selectedDay,this._getDaysInMonth(s,n))+("D"===i?e:0),a=this._restrictMinMax(t,this._daylightSavingAdjust(new Date(s,n,o)));t.selectedDay=a.getDate(),t.drawMonth=t.selectedMonth=a.getMonth(),t.drawYear=t.selectedYear=a.getFullYear(),("M"===i||"Y"===i)&&this._notifyChange(t)},_restrictMinMax:function(t,e){var i=this._getMinMaxDate(t,"min"),s=this._getMinMaxDate(t,"max"),n=i&&i>e?i:e;return s&&n>s?s:n},_notifyChange:function(t){var e=this._get(t,"onChangeMonthYear");e&&e.apply(t.input?t.input[0]:null,[t.selectedYear,t.selectedMonth+1,t])},_getNumberOfMonths:function(t){var e=this._get(t,"numberOfMonths");return null==e?[1,1]:"number"==typeof e?[1,e]:e},_getMinMaxDate:function(t,e){return this._determineDate(t,this._get(t,e+"Date"),null)},_getDaysInMonth:function(t,e){return 32-this._daylightSavingAdjust(new Date(t,e,32)).getDate()},_getFirstDayOfMonth:function(t,e){return new Date(t,e,1).getDay()},_canAdjustMonth:function(t,e,i,s){var n=this._getNumberOfMonths(t),o=this._daylightSavingAdjust(new Date(i,s+(0>e?e:n[0]*n[1]),1));return 0>e&&o.setDate(this._getDaysInMonth(o.getFullYear(),o.getMonth())),this._isInRange(t,o)},_isInRange:function(t,e){var i,s,n=this._getMinMaxDate(t,"min"),o=this._getMinMaxDate(t,"max"),a=null,r=null,h=this._get(t,"yearRange");return h&&(i=h.split(":"),s=(new Date).getFullYear(),a=parseInt(i[0],10),r=parseInt(i[1],10),i[0].match(/[+\-].*/)&&(a+=s),i[1].match(/[+\-].*/)&&(r+=s)),(!n||e.getTime()>=n.getTime())&&(!o||e.getTime()<=o.getTime())&&(!a||e.getFullYear()>=a)&&(!r||r>=e.getFullYear())},_getFormatConfig:function(t){var e=this._get(t,"shortYearCutoff");return e="string"!=typeof e?e:(new Date).getFullYear()%100+parseInt(e,10),{shortYearCutoff:e,dayNamesShort:this._get(t,"dayNamesShort"),dayNames:this._get(t,"dayNames"),monthNamesShort:this._get(t,"monthNamesShort"),monthNames:this._get(t,"monthNames")}},_formatDate:function(t,e,i,s){e||(t.currentDay=t.selectedDay,t.currentMonth=t.selectedMonth,t.currentYear=t.selectedYear);var n=e?"object"==typeof e?e:this._daylightSavingAdjust(new Date(s,i,e)):this._daylightSavingAdjust(new Date(t.currentYear,t.currentMonth,t.currentDay));return this.formatDate(this._get(t,"dateFormat"),n,this._getFormatConfig(t))}}),t.fn.datepicker=function(e){if(!this.length)return this;t.datepicker.initialized||(t(document).mousedown(t.datepicker._checkExternalClick),t.datepicker.initialized=!0),0===t("#"+t.datepicker._mainDivId).length&&t("body").append(t.datepicker.dpDiv);var i=Array.prototype.slice.call(arguments,1);return"string"!=typeof e||"isDisabled"!==e&&"getDate"!==e&&"widget"!==e?"option"===e&&2===arguments.length&&"string"==typeof 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t=this.handles.add(this.range).filter("a");this._off(t),this._on(t,this._handleEvents),this._hoverable(t),this._focusable(t)},_destroy:function(){this.handles.remove(),this.range.remove(),this.element.removeClass("ui-slider ui-slider-horizontal ui-slider-vertical ui-widget ui-widget-content ui-corner-all"),this._mouseDestroy()},_mouseCapture:function(e){var i,s,n,o,a,r,h,l,c=this,u=this.options;return u.disabled?!1:(this.elementSize={width:this.element.outerWidth(),height:this.element.outerHeight()},this.elementOffset=this.element.offset(),i={x:e.pageX,y:e.pageY},s=this._normValueFromMouse(i),n=this._valueMax()-this._valueMin()+1,this.handles.each(function(e){var i=Math.abs(s-c.values(e));(n>i||n===i&&(e===c._lastChangedValue||c.values(e)===u.min))&&(n=i,o=t(this),a=e)}),r=this._start(e,a),r===!1?!1:(this._mouseSliding=!0,this._handleIndex=a,o.addClass("ui-state-active").focus(),h=o.offset(),l=!t(e.target).parents().addBack().is(".ui-slider-handle"),this._clickOffset=l?{left:0,top:0}:{left:e.pageX-h.left-o.width()/2,top:e.pageY-h.top-o.height()/2-(parseInt(o.css("borderTopWidth"),10)||0)-(parseInt(o.css("borderBottomWidth"),10)||0)+(parseInt(o.css("marginTop"),10)||0)},this.handles.hasClass("ui-state-hover")||this._slide(e,a,s),this._animateOff=!0,!0))},_mouseStart:function(){return!0},_mouseDrag:function(t){var e={x:t.pageX,y:t.pageY},i=this._normValueFromMouse(e);return this._slide(t,this._handleIndex,i),!1},_mouseStop:function(t){return this.handles.removeClass("ui-state-active"),this._mouseSliding=!1,this._stop(t,this._handleIndex),this._change(t,this._handleIndex),this._handleIndex=null,this._clickOffset=null,this._animateOff=!1,!1},_detectOrientation:function(){this.orientation="vertical"===this.options.orientation?"vertical":"horizontal"},_normValueFromMouse:function(t){var e,i,s,n,o;return"horizontal"===this.orientation?(e=this.elementSize.width,i=t.x-this.elementOffset.left-(this._clickOffset?this._clickOffset.left:0)):(e=this.elementSize.height,i=t.y-this.elementOffset.top-(this._clickOffset?this._clickOffset.top:0)),s=i/e,s>1&&(s=1),0>s&&(s=0),"vertical"===this.orientation&&(s=1-s),n=this._valueMax()-this._valueMin(),o=this._valueMin()+s*n,this._trimAlignValue(o)},_start:function(t,e){var i={handle:this.handles[e],value:this.value()};return this.options.values&&this.options.values.length&&(i.value=this.values(e),i.values=this.values()),this._trigger("start",t,i)},_slide:function(t,e,i){var s,n,o;this.options.values&&this.options.values.length?(s=this.values(e?0:1),2===this.options.values.length&&this.options.range===!0&&(0===e&&i>s||1===e&&s>i)&&(i=s),i!==this.values(e)&&(n=this.values(),n[e]=i,o=this._trigger("slide",t,{handle:this.handles[e],value:i,values:n}),s=this.values(e?0:1),o!==!1&&this.values(e,i,!0))):i!==this.value()&&(o=this._trigger("slide",t,{handle:this.handles[e],value:i}),o!==!1&&this.value(i))},_stop:function(t,e){var i={handle:this.handles[e],value:this.value()};this.options.values&&this.options.values.length&&(i.value=this.values(e),i.values=this.values()),this._trigger("stop",t,i)},_change:function(t,e){if(!this._keySliding&&!this._mouseSliding){var i={handle:this.handles[e],value:this.value()};this.options.values&&this.options.values.length&&(i.value=this.values(e),i.values=this.values()),this._lastChangedValue=e,this._trigger("change",t,i)}},value:function(t){return arguments.length?(this.options.value=this._trimAlignValue(t),this._refreshValue(),this._change(null,0),undefined):this._value()},values:function(e,i){var s,n,o;if(arguments.length>1)return this.options.values[e]=this._trimAlignValue(i),this._refreshValue(),this._change(null,e),undefined;if(!arguments.length)return this._values();if(!t.isArray(arguments[0]))return this.options.values&&this.options.values.length?this._values(e):this.value();for(s=this.options.values,n=arguments[0],o=0;s.length>o;o+=1)s[o]=this._trimAlignValue(n[o]),this._change(null,o);this._refreshValue()},_setOption:function(e,i){var s,n=0;switch("range"===e&&this.options.range===!0&&("min"===i?(this.options.value=this._values(0),this.options.values=null):"max"===i&&(this.options.value=this._values(this.options.values.length-1),this.options.values=null)),t.isArray(this.options.values)&&(n=this.options.values.length),t.Widget.prototype._setOption.apply(this,arguments),e){case"orientation":this._detectOrientation(),this.element.removeClass("ui-slider-horizontal ui-slider-vertical").addClass("ui-slider-"+this.orientation),this._refreshValue();break;case"value":this._animateOff=!0,this._refreshValue(),this._change(null,0),this._animateOff=!1;break;case"values":for(this._animateOff=!0,this._refreshValue(),s=0;n>s;s+=1)this._change(null,s);this._animateOff=!1;break;case"min":case"max":this._animateOff=!0,this._refreshValue(),this._animateOff=!1;break;case"range":this._animateOff=!0,this._refresh(),this._animateOff=!1}},_value:function(){var t=this.options.value;return t=this._trimAlignValue(t)},_values:function(t){var e,i,s;if(arguments.length)return e=this.options.values[t],e=this._trimAlignValue(e);if(this.options.values&&this.options.values.length){for(i=this.options.values.slice(),s=0;i.length>s;s+=1)i[s]=this._trimAlignValue(i[s]);return i}return[]},_trimAlignValue:function(t){if(this._valueMin()>=t)return this._valueMin();if(t>=this._valueMax())return this._valueMax();var e=this.options.step>0?this.options.step:1,i=(t-this._valueMin())%e,s=t-i;return 2*Math.abs(i)>=e&&(s+=i>0?e:-e),parseFloat(s.toFixed(5))},_valueMin:function(){return this.options.min},_valueMax:function(){return this.options.max},_refreshValue:function(){var e,i,s,n,o,a=this.options.range,r=this.options,h=this,l=this._animateOff?!1:r.animate,c={};this.options.values&&this.options.values.length?this.handles.each(function(s){i=100*((h.values(s)-h._valueMin())/(h._valueMax()-h._valueMin())),c["horizontal"===h.orientation?"left":"bottom"]=i+"%",t(this).stop(1,1)[l?"animate":"css"](c,r.animate),h.options.range===!0&&("horizontal"===h.orientation?(0===s&&h.range.stop(1,1)[l?"animate":"css"]({left:i+"%"},r.animate),1===s&&h.range[l?"animate":"css"]({width:i-e+"%"},{queue:!1,duration:r.animate})):(0===s&&h.range.stop(1,1)[l?"animate":"css"]({bottom:i+"%"},r.animate),1===s&&h.range[l?"animate":"css"]({height:i-e+"%"},{queue:!1,duration:r.animate}))),e=i}):(s=this.value(),n=this._valueMin(),o=this._valueMax(),i=o!==n?100*((s-n)/(o-n)):0,c["horizontal"===this.orientation?"left":"bottom"]=i+"%",this.handle.stop(1,1)[l?"animate":"css"](c,r.animate),"min"===a&&"horizontal"===this.orientation&&this.range.stop(1,1)[l?"animate":"css"]({width:i+"%"},r.animate),"max"===a&&"horizontal"===this.orientation&&this.range[l?"animate":"css"]({width:100-i+"%"},{queue:!1,duration:r.animate}),"min"===a&&"vertical"===this.orientation&&this.range.stop(1,1)[l?"animate":"css"]({height:i+"%"},r.animate),"max"===a&&"vertical"===this.orientation&&this.range[l?"animate":"css"]({height:100-i+"%"},{queue:!1,duration:r.animate}))},_handleEvents:{keydown:function(i){var s,n,o,a,r=t(i.target).data("ui-slider-handle-index");switch(i.keyCode){case t.ui.keyCode.HOME:case t.ui.keyCode.END:case t.ui.keyCode.PAGE_UP:case t.ui.keyCode.PAGE_DOWN:case t.ui.keyCode.UP:case t.ui.keyCode.RIGHT:case t.ui.keyCode.DOWN:case t.ui.keyCode.LEFT:if(i.preventDefault(),!this._keySliding&&(this._keySliding=!0,t(i.target).addClass("ui-state-active"),s=this._start(i,r),s===!1))return}switch(a=this.options.step,n=o=this.options.values&&this.options.values.length?this.values(r):this.value(),i.keyCode){case t.ui.keyCode.HOME:o=this._valueMin();break;case t.ui.keyCode.END:o=this._valueMax();break;case t.ui.keyCode.PAGE_UP:o=this._trimAlignValue(n+(this._valueMax()-this._valueMin())/e);break;case t.ui.keyCode.PAGE_DOWN:o=this._trimAlignValue(n-(this._valueMax()-this._valueMin())/e);break;case t.ui.keyCode.UP:case t.ui.keyCode.RIGHT:if(n===this._valueMax())return;o=this._trimAlignValue(n+a);break;case t.ui.keyCode.DOWN:case t.ui.keyCode.LEFT:if(n===this._valueMin())return;o=this._trimAlignValue(n-a)}this._slide(i,r,o)},click:function(t){t.preventDefault()},keyup:function(e){var i=t(e.target).data("ui-slider-handle-index");this._keySliding&&(this._keySliding=!1,this._stop(e,i),this._change(e,i),t(e.target).removeClass("ui-state-active"))}}})}(jQuery),function(t){function e(t){return function(){var e=this.element.val();t.apply(this,arguments),this._refresh(),e!==this.element.val()&&this._trigger("change")}}t.widget("ui.spinner",{version:"1.10.2",defaultElement:"<input>",widgetEventPrefix:"spin",options:{culture:null,icons:{down:"ui-icon-triangle-1-s",up:"ui-icon-triangle-1-n"},incremental:!0,max:null,min:null,numberFormat:null,page:10,step:1,change:null,spin:null,start:null,stop:null},_create:function(){this._setOption("max",this.options.max),this._setOption("min",this.options.min),this._setOption("step",this.options.step),this._value(this.element.val(),!0),this._draw(),this._on(this._events),this._refresh(),this._on(this.window,{beforeunload:function(){this.element.removeAttr("autocomplete")}})},_getCreateOptions:function(){var e={},i=this.element;return t.each(["min","max","step"],function(t,s){var n=i.attr(s);void 0!==n&&n.length&&(e[s]=n)}),e},_events:{keydown:function(t){this._start(t)&&this._keydown(t)&&t.preventDefault()},keyup:"_stop",focus:function(){this.previous=this.element.val()},blur:function(t){return this.cancelBlur?(delete this.cancelBlur,void 0):(this._stop(),this._refresh(),this.previous!==this.element.val()&&this._trigger("change",t),void 0)},mousewheel:function(t,e){if(e){if(!this.spinning&&!this._start(t))return!1;this._spin((e>0?1:-1)*this.options.step,t),clearTimeout(this.mousewheelTimer),this.mousewheelTimer=this._delay(function(){this.spinning&&this._stop(t)},100),t.preventDefault()}},"mousedown .ui-spinner-button":function(e){function i(){var t=this.element[0]===this.document[0].activeElement;t||(this.element.focus(),this.previous=s,this._delay(function(){this.previous=s}))}var s;s=this.element[0]===this.document[0].activeElement?this.previous:this.element.val(),e.preventDefault(),i.call(this),this.cancelBlur=!0,this._delay(function(){delete this.cancelBlur,i.call(this)}),this._start(e)!==!1&&this._repeat(null,t(e.currentTarget).hasClass("ui-spinner-up")?1:-1,e)},"mouseup .ui-spinner-button":"_stop","mouseenter .ui-spinner-button":function(e){return t(e.currentTarget).hasClass("ui-state-active")?this._start(e)===!1?!1:(this._repeat(null,t(e.currentTarget).hasClass("ui-spinner-up")?1:-1,e),void 0):void 0},"mouseleave .ui-spinner-button":"_stop"},_draw:function(){var t=this.uiSpinner=this.element.addClass("ui-spinner-input").attr("autocomplete","off").wrap(this._uiSpinnerHtml()).parent().append(this._buttonHtml());this.element.attr("role","spinbutton"),this.buttons=t.find(".ui-spinner-button").attr("tabIndex",-1).button().removeClass("ui-corner-all"),this.buttons.height()>Math.ceil(.5*t.height())&&t.height()>0&&t.height(t.height()),this.options.disabled&&this.disable()},_keydown:function(e){var i=this.options,s=t.ui.keyCode;switch(e.keyCode){case s.UP:return this._repeat(null,1,e),!0;case s.DOWN:return this._repeat(null,-1,e),!0;case s.PAGE_UP:return this._repeat(null,i.page,e),!0;case s.PAGE_DOWN:return this._repeat(null,-i.page,e),!0}return!1},_uiSpinnerHtml:function(){return"<span class='ui-spinner ui-widget ui-widget-content ui-corner-all'></span>"},_buttonHtml:function(){return"<a class='ui-spinner-button ui-spinner-up ui-corner-tr'><span class='ui-icon "+this.options.icons.up+"'>&#9650;</span>"+"</a>"+"<a class='ui-spinner-button ui-spinner-down ui-corner-br'>"+"<span class='ui-icon "+this.options.icons.down+"'>&#9660;</span>"+"</a>"},_start:function(t){return this.spinning||this._trigger("start",t)!==!1?(this.counter||(this.counter=1),this.spinning=!0,!0):!1},_repeat:function(t,e,i){t=t||500,clearTimeout(this.timer),this.timer=this._delay(function(){this._repeat(40,e,i)},t),this._spin(e*this.options.step,i)},_spin:function(t,e){var i=this.value()||0;this.counter||(this.counter=1),i=this._adjustValue(i+t*this._increment(this.counter)),this.spinning&&this._trigger("spin",e,{value:i})===!1||(this._value(i),this.counter++)},_increment:function(e){var i=this.options.incremental;return i?t.isFunction(i)?i(e):Math.floor(e*e*e/5e4-e*e/500+17*e/200+1):1},_precision:function(){var t=this._precisionOf(this.options.step);return null!==this.options.min&&(t=Math.max(t,this._precisionOf(this.options.min))),t},_precisionOf:function(t){var e=""+t,i=e.indexOf(".");return-1===i?0:e.length-i-1},_adjustValue:function(t){var e,i,s=this.options;return e=null!==s.min?s.min:0,i=t-e,i=Math.round(i/s.step)*s.step,t=e+i,t=parseFloat(t.toFixed(this._precision())),null!==s.max&&t>s.max?s.max:null!==s.min&&s.min>t?s.min:t},_stop:function(t){this.spinning&&(clearTimeout(this.timer),clearTimeout(this.mousewheelTimer),this.counter=0,this.spinning=!1,this._trigger("stop",t))},_setOption:function(t,e){if("culture"===t||"numberFormat"===t){var i=this._parse(this.element.val());return this.options[t]=e,this.element.val(this._format(i)),void 0}("max"===t||"min"===t||"step"===t)&&"string"==typeof e&&(e=this._parse(e)),"icons"===t&&(this.buttons.first().find(".ui-icon").removeClass(this.options.icons.up).addClass(e.up),this.buttons.last().find(".ui-icon").removeClass(this.options.icons.down).addClass(e.down)),this._super(t,e),"disabled"===t&&(e?(this.element.prop("disabled",!0),this.buttons.button("disable")):(this.element.prop("disabled",!1),this.buttons.button("enable")))},_setOptions:e(function(t){this._super(t),this._value(this.element.val())}),_parse:function(t){return"string"==typeof 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e.tabs.index(t)}))).sort()),this.active=this.options.active!==!1&&this.anchors.length?this._findActive(i.active):t(),this._refresh(),this.active.length&&this.load(i.active)},_initialActive:function(){var i=this.options.active,s=this.options.collapsible,n=location.hash.substring(1);return null===i&&(n&&this.tabs.each(function(s,o){return t(o).attr("aria-controls")===n?(i=s,!1):e}),null===i&&(i=this.tabs.index(this.tabs.filter(".ui-tabs-active"))),(null===i||-1===i)&&(i=this.tabs.length?0:!1)),i!==!1&&(i=this.tabs.index(this.tabs.eq(i)),-1===i&&(i=s?!1:0)),!s&&i===!1&&this.anchors.length&&(i=0),i},_getCreateEventData:function(){return{tab:this.active,panel:this.active.length?this._getPanelForTab(this.active):t()}},_tabKeydown:function(i){var s=t(this.document[0].activeElement).closest("li"),n=this.tabs.index(s),o=!0;if(!this._handlePageNav(i)){switch(i.keyCode){case t.ui.keyCode.RIGHT:case t.ui.keyCode.DOWN:n++;break;case t.ui.keyCode.UP:case t.ui.keyCode.LEFT:o=!1,n--;break;case t.ui.keyCode.END:n=this.anchors.length-1;break;case t.ui.keyCode.HOME:n=0;break;case t.ui.keyCode.SPACE:return i.preventDefault(),clearTimeout(this.activating),this._activate(n),e;case t.ui.keyCode.ENTER:return i.preventDefault(),clearTimeout(this.activating),this._activate(n===this.options.active?!1:n),e;default:return}i.preventDefault(),clearTimeout(this.activating),n=this._focusNextTab(n,o),i.ctrlKey||(s.attr("aria-selected","false"),this.tabs.eq(n).attr("aria-selected","true"),this.activating=this._delay(function(){this.option("active",n)},this.delay))}},_panelKeydown:function(e){this._handlePageNav(e)||e.ctrlKey&&e.keyCode===t.ui.keyCode.UP&&(e.preventDefault(),this.active.focus())},_handlePageNav:function(i){return i.altKey&&i.keyCode===t.ui.keyCode.PAGE_UP?(this._activate(this._focusNextTab(this.options.active-1,!1)),!0):i.altKey&&i.keyCode===t.ui.keyCode.PAGE_DOWN?(this._activate(this._focusNextTab(this.options.active+1,!0)),!0):e},_findNextTab:function(e,i){function s(){return 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+</script>
+<script type="text/javascript">
+// darksun.js --- darksun JS file
+//
+// Copyright (C) 2011-2016 All Right Reserved, Fabrice Niessen
+//
+// This file is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// This file is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// Author: Fabrice Niessen <(concat "fniessen" at-sign "pirilampo.org")>
+// URL: https://github.com/fniessen/org-html-themes/
+// Version: 20140515.1841
+
+$(function() {
+$('p').
+html(function(index, old) {
+return old.replace('FIXME',
+'<span class="fixme">FIXME</span>');
+});
+$('p').
+html(function(index, old) {
+return old.replace('XXX',
+'<span class="fixme">XXX</span>');
+});
+});
+
+// Remove leading section number
+$(function() {
+$('.section-number-2').text("");
+for (var i = 3; i <= 5; i++) {
+$('.section-number-' + i).each(function() {
+$(this).text($(this).text().replace(/^[0-9]+\./g, ""));
+});
+}
+});
+
+$(function() {
+$('<div id="minitoc" class="dontprint"></div>').prependTo('body');
+});
+
+// generate contents of minitoc
+function generateMiniToc(divId) {
+$('#minitoc-content').empty().append('<h2>In this section</h2><ul></ul>');
+$('#' + divId).find('h3').each(function(i) {
+// [2018-09-03 Mon 03:48] Get text up to non-breaking space,
+// to omit the tags.  If there are no tags, there will be no
+// &nbsp;, so get all the text.  (This fixes a bug in the
+// original code.)
+let text = null;
+let pos = $(this).text().search(/ | ►/);
+if (pos > 0) {
+text = $(this).text().substring(0, pos);
+}
+else {
+text = $(this).text();
+}
+$("#minitoc-content>ul").append("<li><a href='#" + $(this).attr("id") + "'>"
++ text + "</a></li>");
+});
+// Ensure that the target is expanded (hideShow)
+$('#minitoc-content a[href^="#"]').click(function() {
+var href = $(this).attr('href');
+hsExpandAnchor(href);
+});
+}
+
+// display tabs
+function tabifySections() {
+
+// hide TOC (if present)
+$('#table-of-contents').hide();
+
+// grab the list of `h2' from the page
+var allSections = [];
+$('h2')
+.each(function() {
+// Remove TODO keywords and tags (contained in spans)
+var tabText = $(this).clone().find('span').remove().end()
+.text().trim();
+var tabId = $(this).parent().attr('id');
+if (tabText) {
+// - remove heading number (all leading digits)
+// - remove progress logging (between square brackets)
+// - remove leading and trailing spaces
+tabText = tabText.replace(/^\d+\s+/, '').replace(/\[[\d/%]+\]/, '').trim();
+
+allSections.push({
+text: tabText,
+id: tabId
+});
+}
+});
+
+// create the tab links
+var tabs = $('<ul id="tabs"></ul>');
+for (i = 0; i < allSections.length; i++) {
+var item = allSections[i];
+html = $('<li><a href="#' + item.id + '">' + item.text + '</a></li>');
+tabs.append(html);
+}
+
+// insert tabs menu after title (`h1'), or at the beginning of the content
+if($('.title').length !== 0) {
+$('.title').after(tabs);
+}
+else {
+$('#content').prepend(tabs);
+}
+}
+
+function selectTabAndScroll(href) {
+// At this point we assume that href is local (starts with #)
+// alert(href);
+
+// Find the tab to activate
+var targetTab = $(href).closest('.ui-tabs-panel');
+var targetTabId = targetTab.attr('id');
+var targetTabAriaLabel = targetTab.attr('aria-labelledby');
+
+var targetTabIndex = $("#content ul li")
+.index($('[aria-labelledby="' + targetTabAriaLabel + '"]'));
+
+// Activate target tab
+$('#content').tabs('option', 'active', targetTabIndex);
+
+// Rebuild minitoc
+generateMiniToc(targetTabId);
+
+// Set the location hash
+// document.location.hash = href;
+
+// Scroll to top if href was a tab
+if (href == '#' + targetTabId) {
+// alert(targetTabId);
+$.scrollTo(0);
+}
+// Scroll to href if href was not a tab
+else {
+$.scrollTo(href);
+}
+}
+
+$(document).ready(function() {
+$('#preamble').remove();
+$('#table-of-contents').remove();
+
+// Initialize hideShow
+hsInit();
+
+// Prepare for tabs
+tabifySections();
+
+// Build the tabs from the #content div
+$('#content').tabs();
+
+// Set default animation
+$('#content').tabs('option', 'show', true);
+
+// Rebuild minitoc when a tab is activated
+$('#content').tabs({
+activate: function(event, ui) {
+var divId = ui.newTab.attr('aria-controls');
+generateMiniToc(divId);
+}
+});
+
+// Required to get the link of the tab in URL
+$('#content ul').localScroll({
+target: '#content',
+duration: 0,
+hash: true
+});
+
+// Handle hash in URL
+if ($('#content') && document.location.hash) {
+hsExpandAnchor(document.location.hash);
+selectTabAndScroll(document.location.hash);
+}
+// If no hash, build the minitoc anyway for selected tab
+else {
+var divId = $('#content div[aria-expanded=true]').attr('id');
+generateMiniToc(divId);
+}
+
+// Handle click on internal links
+$('.ui-tabs-panel a[href^="#"]').click(function(e) {
+var href = $(this).attr('href');
+hsExpandAnchor(href);
+selectTabAndScroll(href);
+e.preventDefault();
+});
+
+// add sticky headers to tables
+$('table').stickyTableHeaders();
+});
+
+function copyToClipboard(text)
+{
+if (window.clipboardData && window.clipboardData.setData) { // Internet Explorer
+window.clipboardData.setData("Text", text);
+}
+else { // Fallback solution
+window.prompt("Copy to clipboard: Ctrl+C, Enter", text);
+}
+}
+
+$(document).ready(function() {
+// Assuming that the ZeroClipboard swf file is in the same folder than darksun,
+// get the path to it (it will be relative to the current page location).
+var bbScriptPath = $('script[src$="darksun.js"]').attr('src');  // the js file path
+var bbPathToZeroClipboardSwf = bbScriptPath.replace('darksun.js', 'ZeroClipboard.swf');
+
+// Add copy to clipboard snippets
+$('.org-src-container').prepend('<div class="snippet-copy-to-clipboard"><span class="copy-to-clipboard-button">[copy]</span></div>');
+
+// Display/hide snippets on source block mouseenter/mouseleave
+$(document).on('mouseenter', '.org-src-container', function () {
+$(this).find('.snippet-copy-to-clipboard').show();
+
+// Need to call zclip here, once the button is visible.
+// Beacause when the button is not visible, zclip does nothing.
+if ((window.location.protocol != 'file:') && ($(this).find('.zclip').length == 0)) {
+$(this).find('.copy-to-clipboard-button').zclip({
+//path: 'http://www.steamdev.com/zclip/js/ZeroClipboard.swf',
+//path: 'styles/darksun/js/ZeroClipboard.swf',
+path: bbPathToZeroClipboardSwf,
+copy: function() {
+return $(this).parent().parent().find('.src').text();
+}
+});
+}
+}).on('mouseleave', '.org-src-container', function () {
+$(this).find('.snippet-copy-to-clipboard').hide();
+});
+
+// Handle copy to clipboard (here, for a local file only 'file://...'
+if (window.location.protocol == 'file:') { // if local file use browser-specific code
+$('.copy-to-clipboard-button').click(function() {
+// Get the text to be copied
+var text = $(this).parent().parent().find('.src').text();
+text = text.replace(/\n/g, "\r\n");
+// alert(text);
+copyToClipboard(text);
+});
+}
+});
+
+$(function() {
+$('li > code :contains("[X]")')
+.parent()
+.addClass('checked')
+.end()
+.remove();
+$('li > code :contains("[-]")')
+.parent()
+.addClass('halfchecked')
+.end()
+.remove();
+$('li > code :contains("[ ]")')
+.parent()
+.addClass('unchecked')
+.end()
+.remove();
+});
+
+$(function() {
+$('i :contains("[#A]")')
+.replaceWith('<i><span style="color: #F67777;">[#A]</span></i>');
+$('i :contains("[#B]")')
+.replaceWith('<i><span style="color: #B6E864;">[#B]</span></i>');
+$('i :contains("[#C]")')
+.replaceWith('<i><span style="color: #C3DCFF;">[#C]</span></i>');
+});
+
+function togglePanel(e) {
+e.preventDefault();
+
+$("#left-panel-contents").toggleClass('active').toggle(200);
+$("#right-panel-contents").toggleClass('active').toggle(200);
+
+var slidePos =
+$("#left-panel-button").css("left") == "-23px"? '182px': '-23px';
+
+$("#left-panel-button").
+animate({"left": slidePos, "opacity": 0.9}, {duration: "200" });
+
+// if ($("#left-panel-contents").hasClass('active')) {
+//     hsHideTodoKeyword('done');
+// } else {
+//     hsShowTodoKeyword('done');
+// }
+
+// return false;
+}
+
+$(function() {
+$('<div id="left-panel-wrapper" class="dontprint"><div id="left-panel-contents" style="opacity: 0.9"></div><div id="left-panel-button" class="dontprint"><a href="#">Dashboard</a></div></div>')
+.appendTo('body');
+
+$('<div id="right-panel-wrapper" class="dontprint"><div id="right-panel-contents" style="opacity: 0.9"></div></div>')
+.appendTo('body');
+
+$('#left-panel-button').click(togglePanel);
+});
+
+$(function() {
+var ul = $('<ul id="listOfTodo"></ul>').appendTo('#left-panel-contents');
+var countOfTodo = {}, listOfTodo = [], totalOfTodo = 0;
+
+// assign the counts (avoid double-counting elements from the ToC)
+$('span.todo').not($('#table-of-contents span.todo')).each(function() {
+var $thisTodo = $(this).text().trim();
+
+if ($.inArray($thisTodo, listOfTodo) == -1) {
+countOfTodo[$thisTodo] = 1;
+listOfTodo.push($thisTodo);
+}
+else
+countOfTodo[$thisTodo] += 1;
+totalOfTodo += 1;
+});
+
+function scoreTodo(t) {
+switch (t) {
+case 'NEW': return 1;
+case 'TODO': return 2;
+case 'STRT': return 3;
+case 'WAIT': return 4;
+case 'DLGT': return 5;
+case 'SDAY': return 6;
+case 'DFRD': return 7;
+case 'DONE': return 8;
+case 'CANX': return 9;
+default: return 0;
+}
+}
+
+function compareTodo(a, b) {
+if (scoreTodo(a) < scoreTodo(b)) return -1;
+if (scoreTodo(a) > scoreTodo(b)) return 1;
+return 0;
+}
+
+listOfTodo.sort(compareTodo);
+
+// display
+for (i = 0; i < listOfTodo.length; i++) {
+var $thisTodo = listOfTodo[i];
+$(ul).append('<li><span class="todo ' + $thisTodo + '">'+ $thisTodo + '</span>'
++ ' <small>(' + countOfTodo[$thisTodo] + ')</small></li>');
+}
+
+$('#listOfTodo')
+.before('<b>Next Actions</b> <small>(' + totalOfTodo + ')</small>:<br>');
+});
+
+$(function() {
+var ul = $('<ul id="listOfDone"></ul>').appendTo('#left-panel-contents');
+var countOfDone = {}, listOfDone = [], totalOfDone = 0;
+
+// assign the counts (avoid double-counting elements from the ToC)
+$('span.done').not($('#table-of-contents span.done')).each(function() {
+var $thisDone = $(this).text().trim();
+
+if ($.inArray($thisDone, listOfDone) == -1) {
+countOfDone[$thisDone] = 1;
+listOfDone.push($thisDone);
+}
+else
+countOfDone[$thisDone] += 1;
+totalOfDone += 1;
+});
+
+// display
+for (i = 0; i < listOfDone.length; i++) {
+var $thisDone = listOfDone[i];
+$(ul).append('<li><span class="done ' + $thisDone + '">'+ $thisDone + '</span>'
++ ' <small>(' + countOfDone[$thisDone] + ')</small></li>');
+}
+
+$('#listOfDone')
+.before('<b>Done Actions</b> <small>(' + totalOfDone + '):</small><br>');
+});
+
+$(function() {
+var ul = $('<ul id="listOfTags"></ul>').appendTo('#right-panel-contents');
+var countOfTags = {}, listOfTags = [], totalOfTags = 0;
+
+// assign the counts (avoid double-counting elements from the ToC)
+$('span.tag').not($('#table-of-contents span.tag')).each(function() {
+var $thisTagGroup = $(this).text().trim().split(/\s/);
+// \s matches spaces, tabs, new lines, etc.
+
+for (tag in $thisTagGroup) {
+if ($.inArray($thisTagGroup[tag], listOfTags) == -1) {
+countOfTags[$thisTagGroup[tag]] = 1;
+listOfTags.push($thisTagGroup[tag]);
+}
+else
+countOfTags[$thisTagGroup[tag]] += 1;
+totalOfTags += 1;
+}
+});
+
+listOfTags.sort();
+
+// display
+for (i = 0; i < listOfTags.length; i++) {
+var $thisTag = listOfTags[i];
+// $(ul).append('<li><span class="tag ' + $thisTag + '">'+
+//                   $thisTag + '</span> <small>(' + countOfTags[$thisTag] + ')</small></li>');
+$(ul).append('<li><span class="tag"><span class="' + $thisTag + '">' + $thisTag
++ '</span></span>'
++ ' <small>(' + countOfTags[$thisTag] + ')</small></li>');
+}
+
+$('#listOfTags')
+.before('<b>Contexts</b> <small>(' + totalOfTags + '):</small><br>');
+});
+
+$(function() {
+$('.done').parent(':header').parent().find(':header').addClass('DONEheader');
+$('.done').parent(':header').parent().css({color: '#999999'});
+});
+
+$(function() {
+$('span.todo').click(function(e) {
+var orgKeyword = $(this).text().trim();
+$('.' + orgKeyword).toggleClass('selected');
+$('#content .' + orgKeyword).parent().parent()
+.toggleClass('match' + orgKeyword);
+$('#left-panel-wrapper .' + orgKeyword).parent()
+.toggleClass('match' + orgKeyword);
+e.preventDefault();
+})
+});
+
+$(function() {
+$('.tag span').click(function(e) {
+var orgTag = $(this).text().trim();
+$('.' + orgTag).toggleClass('selected');
+$('#content .' + orgTag).parent().parent().parent()
+.toggleClass('matchtag');
+$('#right-panel-wrapper .' + orgTag).parent().parent()
+.toggleClass('matchtag');
+e.preventDefault();
+})
+});
+
+function clickPreviousTab() {
+var active = $('#content').tabs('option', 'active');
+// Avoid going back to last tab
+if (active == 0) return;
+
+$('#content').tabs('option', 'active', active - 1);
+
+// Set the location href
+var href = $('#content div[aria-expanded=true]').attr('id');
+document.location.hash = href;
+$.scrollTo(0);
+}
+
+function clickNextTab() {
+var active = $('#content').tabs('option', 'active');
+$('#content').tabs('option', 'active', active + 1);
+
+// Set the location href
+var href = $('#content div[aria-expanded=true]').attr('id');
+document.location.hash = href;
+$.scrollTo(0);
+}
+
+function orgDefkey(e) {
+if (!e)
+var e = window.event;
+var keycode = (e.keyCode) ? e.keyCode : e.which;
+var actualkey = String.fromCharCode(keycode);
+switch (actualkey) {
+case "?": // help (dashboard)
+case "h":
+togglePanel(e);
+break;
+case "n": // next
+clickNextTab();
+break;
+case "p": // previous
+clickPreviousTab();
+break;
+// case "b": // scroll down - should be mapped to Shift-SPC
+//     $(window).scrollTop($(window).scrollTop()-$(window).height());
+//     break;
+case "<": // scroll to top
+$(window).scrollTop(0);
+break;
+case ">": // scroll to bottom
+$(window).scrollTop($(document).height());
+break;
+case "-": // collapse all
+hsCollapseAll();
+break;
+case "+": // expand all
+hsExpandAll();
+break;
+case "r": // go to next task
+hsReviewTaskNext();
+break;
+case "R": // go to previous task
+hsReviewTaskPrev();
+break;
+case "q": // quit reviewing
+hsReviewTaskQuit();
+break;
+case "g": // refresh the page (from the server, rather than the cache)
+location.reload(true);
+break;
+}
+}
+
+document.onkeypress = orgDefkey;
+</script>
+<script type="text/javascript">
+// hideshow.js --- HideShow JS file
+//
+// Copyright (C) 2014 All Right Reserved, Fabrice Niessen
+//
+// This file is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// This file is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// Author: Fabrice Niessen <(concat "fniessen" at-sign "pirilampo.org")>
+// URL: https://github.com/fniessen/hide-show/
+// Version: 20140912.1722
+
+// var HS_COLLAPSIBLE_HEADERS = $('h3, h4, h5'); // collapsible headers
+
+if (typeof HS_STARTUP_FOLDED === 'undefined') {
+var HS_STARTUP_FOLDED = false;      // Show just the overview, or show all.
+}
+
+if (typeof HS_SHOW_ALL_TEXT === 'undefined') {
+var HS_SHOW_ALL_TEXT = 'Expand';
+}
+if (typeof HS_HIDE_ALL_TEXT === 'undefined') {
+var HS_HIDE_ALL_TEXT = 'Collapse';
+}
+
+if (typeof HS_ALWAYS_DISPLAY_ICON === 'undefined') {
+var HS_ALWAYS_DISPLAY_ICON = false; // Display an icon for all states, or
+// just when closed.
+}
+
+if (typeof HS_ICON_CLOSED === 'undefined') {
+var HS_ICON_CLOSED = '&#x25BA;';    // black right-pointing pointer
+}
+if (typeof HS_ICON_OPEN === 'undefined') {
+var HS_ICON_OPEN = '&#x25BC;';      // black down-pointing triangle
+}
+if (typeof HS_ICON_EMPTY === 'undefined') {
+var HS_ICON_EMPTY = '&#x25A0;';     // black square
+}
+
+if (typeof HS_SHOW_ALL_OPEN_DONE_TREES === 'undefined') {
+var HS_SHOW_ALL_OPEN_DONE_TREES = false; // Expand all will open DONE trees.
+}
+
+if (typeof HS_CLASS === 'undefined') {
+var HS_CLASS = 'hsCollapsible';
+}
+
+// Expand a header
+function hsExpand(header) {
+hsExpand2(header, true);
+}
+
+// Expand a header
+function hsExpand2(header, expandDoneHeader) {
+// Ignore non collapsible entries
+if (!header.parent().hasClass(HS_CLASS)) return;
+
+// Do not expand DONE node if not required
+if (hsIsDoneHeader(header) && !expandDoneHeader) return;
+
+header.children('span[class="ellipsis"]').remove();
+if (HS_ALWAYS_DISPLAY_ICON == true) {
+header.append('<span class="ellipsis"> ' + HS_ICON_OPEN + '</span>');
+}
+header.parent().removeClass('hsCollapsed').addClass('hsExpanded');
+header.nextAll().show();
+}
+
+// Expand a header and all its parents
+function hsExpandParents(header) {
+hsExpand(header);
+header.parents('.hsCollapsed').each(function() {
+hsExpand($(this).children(':header'));
+});
+}
+
+// Collapse a header and all its parents
+function hsCollapseParents(header) {
+hsCollapse(header);
+header.parents('.hsExpanded').each(function() {
+hsCollapse($(this).children(':header'));
+});
+}
+
+// Collapse a header
+function hsCollapse(header) {
+// Ignore non collapsible entries
+if (!header.parent().hasClass(HS_CLASS)) return;
+
+header.children('span[class="ellipsis"]').remove();
+header.append('<span class="ellipsis"> ' + HS_ICON_CLOSED + '</span>');
+header.parent().removeClass('hsExpanded').addClass('hsCollapsed');
+// header.nextAll().hide('fast');
+header.nextAll().hide();
+}
+
+// Toggle a header
+function hsToggleCollapsing(header) {
+if (header.parent().hasClass('hsCollapsed'))
+hsExpand(header);
+else if (header.parent().hasClass('hsExpanded'))
+hsCollapse(header);
+}
+
+// Expand all headers
+function hsExpandAll() {
+$('#content .hsCollapsed').each(function() {
+hsExpand2($(this).children(':header'), HS_SHOW_ALL_OPEN_DONE_TREES);
+});
+}
+
+// Collapse all headers
+function hsCollapseAll() {
+$('#content .hsExpanded').each(function() {
+hsCollapse($(this).children(':header'));
+});
+}
+
+// Collapse all visible headers
+function hsCollapseAllVisible() {
+$('#content .hsExpanded:visible').each(function() {
+hsCollapse($(this).children(':header'));
+});
+}
+
+// Add click events to H3/H4/H5 headers which have contents.
+function hsInit() {
+for (var i = 3; i <= 5; i++) {
+$('#content .outline-' + i).each(function() {
+var header = $(this).children(':header');
+if (header.siblings().length > 0) {
+$(this).addClass(HS_CLASS);
+header.css({cursor: 'pointer'});
+header.click(function() {
+hsToggleCollapsing($(this)); });
+
+// Allow to override global Collapse/Expand default on an entry
+// basis (see property `:HTML_CONTAINER_CLASS:')
+if (header.parent().hasClass('hsCollapsed')) {
+hsCollapse(header);
+} else if (header.parent().hasClass('hsExpanded')) {
+hsExpand(header);
+} else {
+hsSetDefaultVisibility(header);
+}
+}
+else {
+if (HS_ALWAYS_DISPLAY_ICON == true) {
+header.append('<span class="ellipsis"> ' + HS_ICON_EMPTY
++ '</span>');
+}
+$(this).addClass('hsEmpty');
+}
+});
+}
+
+// Add div to hold minitoc content (so it can be cleared without deleting the buttons)
+$('#minitoc').append($('<div id="minitoc-content"></div>'));
+
+// Add buttons
+$('#minitoc').append($('<div class="buttons dontprint"></div>'));
+$('.buttons').append($('<span>' + HS_SHOW_ALL_TEXT + '</span>')
+.addClass('hsButton')
+.click(hsExpandAll));
+$('.buttons').append($('<span>' + HS_HIDE_ALL_TEXT + '</span>')
+.addClass('hsButton')
+.click(hsCollapseAll));
+}
+
+// Returns true if a header is a DONE header
+function hsIsDoneHeader(header) {
+return $('span.done', header).length;
+}
+
+// Sets the default visibility state to a header
+function hsSetDefaultVisibility(header) {
+if (HS_STARTUP_FOLDED) {
+hsCollapse(header);
+}
+else {
+if (!hsIsDoneHeader(header) | HS_SHOW_ALL_OPEN_DONE_TREES) {
+hsExpand(header);
+}
+else {
+hsCollapse(header);
+}
+}
+}
+
+// Expands an anchor, i.e. expand all parent headers
+function hsExpandAnchor(id) {
+// alert(id);
+if (id) {
+// alert($(id + '.hsNode').length);
+$(id).parents('.hsCollapsed').each(function() {
+hsExpand2($(this).children(':header'), true);
+});
+}
+}
+
+// Search for next task to review, starting from beginning of current tab.
+// If BACKWARD is true, search in the reverse direction.
+function hsReviewTaskNext(backward) {
+// If no tasks to review at all, do nothing.
+if ($('.outline-2 span.todo').length == 0) return;
+
+if ($('.hsReviewing').length == 0) { // reviewing is starting
+$('body').addClass('hsReviewing');
+$('.hsReviewPanel').addClass('hsReviewing');
+$('body').prepend('<div id="hsOverlay"></div>');
+hsAddReviewingPanels();
+
+hsCollapseAll();
+// Get first task to review on each tab and expand it
+$('.outline-2').each(function(){
+var firstTodo = $(this).find('span.todo:first').parent().parent();
+firstTodo.addClass('hsReview');
+hsExpandParents($(firstTodo).children(':header'));
+});
+}
+else {
+// Get all todos
+var todosElements = $('.outline-2:visible span.todo').parent().parent();
+// alert(todosElements.length);
+var todos = jQuery.makeArray(todosElements);
+if (backward) {
+todos = todos.reverse();
+}
+
+// Find current review item and review the next one
+var foundReview = false;
+var index;
+for (index = 0; index < todos.length; ++index) {
+var todo = todos[index];
+if (foundReview) {
+$(todo).addClass('hsReview');
+hsExpandParents($(todo).children(':header'));
+break;
+}
+if ($(todo).hasClass('hsReview')) {
+foundReview = true;
+if (index < todos.length - 1) {
+$(todo).removeClass('hsReview');
+hsCollapseParents($(todo).children(':header'));
+}
+}
+}
+
+// Update reviewing panel
+if (index < todos.length) {
+var reviewItem = index + 1;
+if (backward) {
+reviewItem = todos.length - index;
+}
+
+$('.outline-2:visible .hsReviewingPanel .hsReviewItem').text(reviewItem);
+}
+}
+
+// Scroll to the current review item
+$('html, body').animate({
+scrollTop: $(".hsReview:visible").offset().top
+}, 200);
+}
+
+// go to previous task to review
+function hsReviewTaskPrev() {
+hsReviewTaskNext(true);
+}
+
+// stop reviewing tasks
+function hsReviewTaskQuit() {
+$('body').removeClass('hsReviewing');
+$('.hsReviewPanel').removeClass('hsReviewing');
+$('.hsReview').removeClass('hsReview');
+$('#hsOverlay').remove();
+$('.hsReviewingPanel').remove();
+}
+
+function hsHideTodoKeyword(kw) {
+$('span.' + kw).addClass('hsHidden').parent().parent().hide();
+}
+
+function hsShowTodoKeyword(kw) {
+$('span.' + kw).removeClass('hsHidden').parent().parent().show();
+// XXX Show if parent is not collapsed!
+}
+
+function hsAddReviewPanels() {
+$('.outline-2').each(function(e) {
+var nbItems = $(this).find('span.todo').length;
+if (nbItems > 0) {
+$(this).prepend('<div class="hsReviewPanel hsUnselectable" onclick="hsReviewTaskNext()">'
++ 'Press r or click here<br>'
++ 'to review ' + nbItems + ' tasks<br>'
++ '(out of ' +  nbReviewTotalTasks + ' tasks)</div>');
+}
+});
+}
+
+function hsAddReviewingPanels() {
+$('.outline-2').each(function(e) {
+var nbItems = $(this).find('span.todo').length;
+if (nbItems > 0) {
+$(this).prepend('<div class="hsReviewingPanel hsUnselectable">Reviewing task <span class="hsReviewItem">1</span> / ' + nbItems + '<br>'
++ '(out of ' +  nbReviewTotalTasks + ' tasks)<br>'
++ 'Shortcuts: '
++ '<span class="hsReviewButton" onclick="hsReviewTaskNext()">r (next)</span> - '
++ '<span class="hsReviewButton" onclick="hsReviewTaskPrev()">R (previous)</span>'
++ '</div>');
+}
+else {
+$(this).prepend('<div class="hsReviewingPanel hsUnselectable">No task to review<br>'
++ '(out of ' +  nbReviewTotalTasks + ' tasks)<br>'
++ 'Shortcuts: '
++ '<span class="hsReviewButton" onclick="hsReviewTaskNext()">r (next)</span> - '
++ '<span class="hsReviewButton" onclick="hsReviewTaskPrev()">R (previous)</span>'
++ '</div>');
+}
+});
+}
+
+var nbReviewTotalTasks;
+
+$(document).ready(function() {
+nbReviewTotalTasks = $('.outline-2 span.todo').length;
+hsAddReviewPanels();
+});
+</script>
+<style type="text/css">
+               body {
+                 max-width: 35cm !important;
+               }
+               #content {
+                 max-width: 80em !important;
+                 width: 90%;
+               }
+               </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">Truth table calculator</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#org553b118">1. Implemented logical operations</a>
+<ul>
+<li><a href="#org9c9ba62">1.1. Equivalent ( ⇔ , 1 )</a></li>
+<li><a href="#org2c565cf">1.2. Implies ( ⇒ , 2 )</a></li>
+<li><a href="#org8fd4c7b">1.3. OR ( ∨ , 3 )</a></li>
+<li><a href="#org422252e">1.4. AND ( ∧ , 4 )</a></li>
+<li><a href="#orga0458d5">1.5. NOT ( ¬ , 5 )</a></li>
+</ul>
+</li>
+<li><a href="#org375fe5b">2. Examples</a>
+<ul>
+<li><a href="#org2167e31">2.1. Example: (A ∧ B) ∨ ¬C</a></li>
+<li><a href="#org0a783a3">2.2. Example: A ⇒ (B ∨ ¬C)</a></li>
+<li><a href="#org20994f3">2.3. Example: (A ⇔ B) ∧ C</a></li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<ul class="org-ul">
+<li>See also: <a href="https://en.wikipedia.org/wiki/Truth_table">https://en.wikipedia.org/wiki/Truth_table</a></li>
+</ul>
+
+<p>
+A truth table is a mathematical table used to determine the output of a logic function
+based on all possible combinations of inputs. Each row represents a possible state of
+the input variables, with the corresponding output value. Truth tables are crucial in
+designing and understanding digital circuits, Boolean algebra, and logical expressions.
+</p>
+
+<div id="outline-container-org553b118" class="outline-2">
+<h2 id="org553b118"><span class="section-number-2">1.</span> Implemented logical operations</h2>
+<div class="outline-text-2" id="text-1">
+</div>
+<div id="outline-container-org9c9ba62" class="outline-3">
+<h3 id="org9c9ba62"><span class="section-number-3">1.1.</span> Equivalent ( ⇔ , 1 )</h3>
+<div class="outline-text-3" id="text-1-1">
+<p>
+The equivalent operation, also known as logical biconditional, is true if and only if
+both inputs are the same. In other words, it asserts that both propositions are
+either both true or both false. It is often represented by the symbol <b>⇔</b>.
+</p>
+
+<p>
+Truth Table:
+</p>
+
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">A</th>
+<th scope="col" class="org-left">B</th>
+<th scope="col" class="org-left">A ⇔ B</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-org2c565cf" class="outline-3">
+<h3 id="org2c565cf"><span class="section-number-3">1.2.</span> Implies ( ⇒ , 2 )</h3>
+<div class="outline-text-3" id="text-1-2">
+<p>
+An implication asserts that if the first proposition is true, the
+second must be true as well. If the first is false, the implication
+holds regardless of the second proposition's value.
+</p>
+
+<p>
+Truth table:
+</p>
+
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">A</th>
+<th scope="col" class="org-left">B</th>
+<th scope="col" class="org-left">A ⇒ B</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-org8fd4c7b" class="outline-3">
+<h3 id="org8fd4c7b"><span class="section-number-3">1.3.</span> OR ( ∨ , 3 )</h3>
+<div class="outline-text-3" id="text-1-3">
+<p>
+The OR operation, also known as logical disjunction, is true if at
+least one of the inputs is true. It asserts that if either proposition
+is true, the entire expression is true.
+</p>
+
+<p>
+Truth table:
+</p>
+
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">A</th>
+<th scope="col" class="org-left">B</th>
+<th scope="col" class="org-left">A ∨ B</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-org422252e" class="outline-3">
+<h3 id="org422252e"><span class="section-number-3">1.4.</span> AND ( ∧ , 4 )</h3>
+<div class="outline-text-3" id="text-1-4">
+<p>
+The AND operation, also known as logical conjunction, is true if and
+only if both inputs are true.
+</p>
+
+<p>
+Truth table:
+</p>
+
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">A</th>
+<th scope="col" class="org-left">B</th>
+<th scope="col" class="org-left">A ∧ B</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-orga0458d5" class="outline-3">
+<h3 id="orga0458d5"><span class="section-number-3">1.5.</span> NOT ( ¬ , 5 )</h3>
+<div class="outline-text-3" id="text-1-5">
+<p>
+The NOT operation, also known as logical negation, inverts the value
+of the input. If the input is true, the output is false, and vice
+versa.
+</p>
+
+<p>
+Truth Table:
+</p>
+
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">A</th>
+<th scope="col" class="org-left">¬A</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+</div>
+<div id="outline-container-org375fe5b" class="outline-2">
+<h2 id="org375fe5b"><span class="section-number-2">2.</span> Examples</h2>
+<div class="outline-text-2" id="text-2">
+</div>
+<div id="outline-container-org2167e31" class="outline-3">
+<h3 id="org2167e31"><span class="section-number-3">2.1.</span> Example: (A ∧ B) ∨ ¬C</h3>
+<div class="outline-text-3" id="text-2-1">
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">A</th>
+<th scope="col" class="org-left">B</th>
+<th scope="col" class="org-left">C</th>
+<th scope="col" class="org-left">(A ∧ B) ∨ ¬C</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-org0a783a3" class="outline-3">
+<h3 id="org0a783a3"><span class="section-number-3">2.2.</span> Example: A ⇒ (B ∨ ¬C)</h3>
+<div class="outline-text-3" id="text-2-2">
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">A</th>
+<th scope="col" class="org-left">B</th>
+<th scope="col" class="org-left">C</th>
+<th scope="col" class="org-left">A ⇒ (B ∨ ¬C)</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-org20994f3" class="outline-3">
+<h3 id="org20994f3"><span class="section-number-3">2.3.</span> Example: (A ⇔ B) ∧ C</h3>
+<div class="outline-text-3" id="text-2-3">
+<p>
+Truth Table:
+</p>
+
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">A</th>
+<th scope="col" class="org-left">B</th>
+<th scope="col" class="org-left">C</th>
+<th scope="col" class="org-left">(A ⇔ B) ∧ C</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">T</td>
+<td class="org-left">T</td>
+</tr>
+
+<tr>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+<td class="org-left">F</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2025-05-31 la 07:09</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/Math/Truth table calculator/index.org b/Math/Truth table calculator/index.org
new file mode 100644
index 0000000..cd58c50
--- /dev/null
+++ b/Math/Truth table calculator/index.org	
@@ -0,0 +1,131 @@
+#+SETUPFILE: ~/.emacs.d/org-styles/html/darksun.theme
+#+TITLE: Truth table calculator
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+- See also: https://en.wikipedia.org/wiki/Truth_table
+
+A truth table is a mathematical table used to determine the output of a logic function
+based on all possible combinations of inputs. Each row represents a possible state of
+the input variables, with the corresponding output value. Truth tables are crucial in
+designing and understanding digital circuits, Boolean algebra, and logical expressions.
+
+* Implemented logical operations
+** Equivalent ( ⇔ , 1 )
+
+The equivalent operation, also known as logical biconditional, is true if and only if
+both inputs are the same. In other words, it asserts that both propositions are
+either both true or both false. It is often represented by the symbol *⇔*.
+
+Truth Table:
+
+| A | B | A ⇔ B |
+|---+---+-------|
+| T | T | T     |
+| T | F | F     |
+| F | T | F     |
+| F | F | T     |
+
+** Implies ( ⇒ , 2 )
+
+An implication asserts that if the first proposition is true, the
+second must be true as well. If the first is false, the implication
+holds regardless of the second proposition's value.
+
+Truth table:
+
+| A | B | A ⇒ B |
+|---+---+-------|
+| T | T | T     |
+| T | F | F     |
+| F | T | T     |
+| F | F | T     |
+
+** OR ( ∨ , 3 )
+
+The OR operation, also known as logical disjunction, is true if at
+least one of the inputs is true. It asserts that if either proposition
+is true, the entire expression is true.
+
+Truth table:
+
+| A | B | A ∨ B |
+|---+---+-------|
+| T | T | T     |
+| T | F | T     |
+| F | T | T     |
+| F | F | F     |
+
+** AND ( ∧ , 4 )
+
+The AND operation, also known as logical conjunction, is true if and
+only if both inputs are true.
+
+Truth table:
+
+| A | B | A ∧ B |
+|---+---+-------|
+| T | T | T     |
+| T | F | F     |
+| F | T | F     |
+| F | F | F     |
+
+** NOT ( ¬ , 5 )
+
+The NOT operation, also known as logical negation, inverts the value
+of the input. If the input is true, the output is false, and vice
+versa.
+
+Truth Table:
+
+| A | ¬A |
+|---+----|
+| T | F  |
+| F | T  |
+* Examples
+
+** Example: (A ∧ B) ∨ ¬C
+
+| A | B | C | (A ∧ B) ∨ ¬C |
+|---+---+---+--------------|
+| T | T | T | T            |
+| T | T | F | T            |
+| T | F | T | F            |
+| T | F | F | T            |
+| F | T | T | F            |
+| F | T | F | T            |
+| F | F | T | F            |
+| F | F | F | T            |
+
+** Example: A ⇒ (B ∨ ¬C)
+
+| A | B | C | A ⇒ (B ∨ ¬C) |
+|---+---+---+--------------|
+| T | T | T | T            |
+| T | T | F | T            |
+| T | F | T | F            |
+| T | F | F | T            |
+| F | T | T | T            |
+| F | T | F | T            |
+| F | F | T | T            |
+| F | F | F | T            |
+
+** Example: (A ⇔ B) ∧ C
+
+Truth Table:
+
+| A | B | C | (A ⇔ B) ∧ C |
+|---+---+---+-------------|
+| T | T | T | T           |
+| T | T | F | F           |
+| T | F | T | F           |
+| T | F | F | F           |
+| F | T | T | F           |
+| F | T | F | F           |
+| F | F | T | T           |
+| F | F | F | F           |
diff --git a/Math/Truth table calculator/truth.bas b/Math/Truth table calculator/truth.bas
new file mode 100755
index 0000000..ee39e82
--- /dev/null
+++ b/Math/Truth table calculator/truth.bas	
@@ -0,0 +1,597 @@
+'                         TRUTH TABLE CALCULATOR
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2024 - 2025, Improved program readability
+'
+'
+' A truth table is a mathematical table used to determine the output of a
+' logic function based on all possible combinations of inputs. Each row
+' represents a possible state of the input variables, with the
+' corresponding output value. Truth tables are crucial in designing and
+' understanding digital circuits, Boolean algebra, and logical
+' expressions.
+'
+' Implemented operations:
+'   Equivalent ( Keyboard shortcut: 1 )
+'   Implies ( Keyboard shortcut: 2 )
+'   OR ( Keyboard shortcut: 3 )
+'   AND ( Keyboard shortcut: 4 )
+'   NOT ( Keyboard shortcut: 5 )
+
+DECLARE SUB removeRedundancies (startIndex!, endIndex!, removalCount!)
+DECLARE SUB getOperatorPriority (a!, b!)
+DECLARE SUB movM (x1!, n!)
+DECLARE SUB clearScreenBuffer ()
+DECLARE SUB lendm (x1!, m!)
+DECLARE SUB mov (x1!, n!)
+DECLARE SUB lendp (x1!, m!)
+DECLARE SUB teeslg (x1!, x2!, l!)
+DECLARE SUB prepare ()
+DECLARE SUB tee (x1!, x2!)
+DECLARE SUB lahend (x1, x2)
+DECLARE SUB printText (x!, y!, c!, c1!, a$)
+DECLARE SUB sist ()
+DECLARE SUB start ()
+DIM SHARED font(0 TO 7, 0 TO 7, 0 TO 122)
+
+' Logical expression storage and processing arrays
+DIM SHARED logicalExpression(0 TO 79) ' Stores ASCII values of logical expression
+DIM SHARED variableValues(1 TO 8, 1 TO 100) ' Stores variable values for each combination
+DIM SHARED variableNames(1 TO 8) ' Stores ASCII values of variable names
+DIM SHARED resultValues(1 TO 100) ' Stores computed result values
+DIM SHARED expressionPosition(0 TO 79) ' Stores screen positions of expression characters
+DIM SHARED xlahn
+DIM SHARED tehl
+DIM SHARED nm
+DIM SHARED prnp
+
+start
+
+13
+sist
+prepare
+GOTO 13
+
+SUB clearScreenBuffer
+' Waits for user input to clear the screen buffer
+FOR a = 1 TO 50
+    a$ = INKEY$
+NEXT a
+END SUB
+
+SUB getOperatorPriority (operator, priority)
+' Determines the priority of logical operators
+SELECT CASE operator
+    CASE 5   ' NOT
+        priority = 1
+    CASE 3, 4  ' OR, AND
+        priority = 2
+    CASE 2   ' Implies
+        priority = 3
+    CASE 1   ' Equivalent
+        priority = 4
+    CASE 40, 41  ' Parentheses
+        priority = 100
+END SELECT
+END SUB
+
+
+SUB lahend (x1, x2)
+' Analyzes and prepares the logical equation for solving
+DIM muu(65 TO 122)
+FOR a = 65 TO 122
+    muu(a) = 0
+NEXT a
+
+muu(116) = 1 ' t
+muu(118) = 1 ' v
+
+nm = 0
+FOR a = x1 TO x2
+    b = logicalExpression(a)
+    IF ((b >= 65) AND (b <= 90)) OR ((b >= 97) AND (b <= 122)) THEN
+        IF muu(b) = 0 THEN
+            nm = nm + 1
+            variableNames(nm) = b
+            muu(b) = 1
+        END IF
+    END IF
+NEXT a
+
+variableNames(nm + 1) = 116 ' t
+variableNames(nm + 2) = 118 ' v
+
+f = 2 ^ nm
+tehl = f
+FOR a = 1 TO nm
+    d = 1
+    e = 1
+    f = f / 2
+    FOR b = 1 TO 2 ^ nm
+        IF e > f THEN d = -d: e = 1
+        IF d = 1 THEN c = ASC("t") ELSE c = ASC("v")
+        variableValues(a, b) = c
+        e = e + 1
+    NEXT b
+NEXT a
+
+FOR a = 1 TO tehl
+    variableValues(nm + 1, a) = 116 ' t
+    variableValues(nm + 2, a) = 118 ' v
+NEXT a
+
+nm = nm + 2
+
+DIM bck(0 TO 79)
+FOR a = 0 TO 79
+    bck(a) = logicalExpression(a)
+    expressionPosition(a) = a
+NEXT a
+
+LOCATE 5, 1
+teeslg x1, x2, a
+
+tee x1, x2 + a
+
+FOR a = 0 TO 79
+    logicalExpression(a) = bck(a)
+NEXT a
+
+FOR a = 1 TO tehl
+    printText x2 + 1, a, 14, 0, CHR$(resultValues(a))
+NEXT a
+
+END SUB
+
+SUB lendm (x1, m)
+' Measures the length of a logical expression enclosed in parentheses
+IF logicalExpression(x1) <> 41 THEN m = 1: GOTO 19
+c = x1
+d = 1
+20
+c = c - 1
+IF logicalExpression(c) = 40 THEN d = d - 1
+IF logicalExpression(c) = 41 THEN d = d + 1
+IF d > 0 THEN GOTO 20
+m = x1 - c
+19
+END SUB
+
+SUB lendp (x1, m)
+' Measures the length of a logical expression enclosed in parentheses
+IF logicalExpression(x1) <> 40 THEN m = 1: GOTO 17
+c = x1
+d = 1
+18
+c = c + 1
+IF logicalExpression(c) = 40 THEN d = d + 1
+IF logicalExpression(c) = 41 THEN d = d - 1
+IF d > 0 THEN GOTO 18
+m = c - x1 + 1
+17
+END SUB
+
+SUB mov (x1, n)
+' Moves a portion of the logical expression to the right
+FOR a = 79 - n TO x1 STEP -1
+    logicalExpression(a + n) = logicalExpression(a)
+    expressionPosition(a + n) = expressionPosition(a)
+NEXT a
+END SUB
+
+SUB movM (x1, n)
+' Moves a portion of the logical expression to the left
+FOR a = x1 TO 79 - n
+    logicalExpression(a) = logicalExpression(a + n)
+    expressionPosition(a) = expressionPosition(a + n)
+NEXT a
+END SUB
+
+SUB prepare
+' Prepares the logical equation for processing
+CLS
+
+ln = 79
+FOR a = 0 TO 79
+5
+    IF logicalExpression(a) = 32 OR logicalExpression(a) = 0 THEN
+        FOR b = a TO 78
+            logicalExpression(b) = logicalExpression(b + 1)
+        NEXT b
+        ln = ln - 1
+        IF ln <= a - 1 THEN GOTO 6
+        GOTO 5
+    END IF
+NEXT a
+6
+
+CLS
+
+FOR a = 0 TO ln
+    printText a, 0, 13, 1, CHR$(logicalExpression(a))
+NEXT a
+
+printText 0, 1, 7, 0, SPACE$(79)
+
+lahend 0, ln
+
+a$ = INPUT$(1)
+
+END SUB
+
+SUB printText (x, y, c, c1, a$)
+    ' Prints characters to the screen at location (x,y) with color c, background c1
+    x1 = x * 8
+    y1 = (y + prnp) * 8
+
+    FOR b = 1 TO LEN(a$)
+        LINE (x1, y1)-(x1 + 7, y1 + 7), c1, BF
+        d = ASC(RIGHT$(LEFT$(a$, b), 1))
+        IF d > 122 THEN GOTO 22
+        FOR y2 = 0 TO 7
+            FOR x2 = 0 TO 7
+                c2 = font(x2, y2, d)
+                IF c2 > 0 THEN PSET (x1 + x2, y1 + y2), c
+            NEXT x2
+        NEXT y2
+22      x1 = x1 + 8
+    NEXT b
+
+END SUB
+
+SUB removeRedundancies (startIndex, endIndex, removalCount)
+    ' This procedure scans for parentheses that can be safely removed
+    ' without changing the logic of the expression, then removes them.
+
+    DIM currentEnd, parenthesesCount
+    currentEnd = endIndex
+    parenthesesCount = 0
+
+    a = startIndex
+26  IF logicalExpression(a) = 40 THEN
+        ' We found an opening parenthesis. Now let's see if it can be removed.
+        IF a = startIndex THEN p1 = 100 ELSE getOperatorPriority logicalExpression(a - 1), p1
+
+        c = a
+        d = 1
+        p2 = 0
+
+25      c = c + 1
+        IF logicalExpression(c) = 40 THEN d = d + 1
+        IF logicalExpression(c) = 41 THEN d = d - 1
+
+        ' Once d returns to 1, we are back to one level of parentheses,
+        ' meaning we can check operator priority inside.
+        IF d = 1 THEN
+            IF (logicalExpression(c) > 0) AND (logicalExpression(c) <= 5) THEN
+                getOperatorPriority logicalExpression(c), b
+                IF b > p2 THEN p2 = b
+            END IF
+        END IF
+
+        IF d > 0 THEN GOTO 25
+
+        IF c + 1 > currentEnd THEN p3 = 100 ELSE getOperatorPriority logicalExpression(c + 1), p3
+
+        ' If the operator outside is higher priority than what's inside,
+        ' we can safely remove the parentheses.
+        IF (p1 > p2) AND (p3 >= p2) THEN
+            movM c, 1
+            movM a, 1
+            parenthesesCount = parenthesesCount + 2
+            currentEnd = currentEnd - 2
+            a = a - 1
+        END IF
+    END IF
+
+    a = a + 1
+    IF a <= currentEnd THEN GOTO 26
+
+    removalCount = parenthesesCount
+END SUB
+
+SUB sist
+' Interacts with the user to input a logical equation
+CLS
+printText 0, 0, 3, 0, "Enter equation (ESC to quit) keys: 1 - " + CHR$(1) + "   2 - " + CHR$(2) + "   3 - " + CHR$(3) + "   4 - " + CHR$(4) + "   5 - " + CHR$(5)
+printText 0, 1, 3, 0, "Example: a" + CHR$(1) + "b" + CHR$(2) + "(g" + CHR$(3) + "b)"
+
+FOR a = 0 TO 79
+    logicalExpression(a) = 0
+NEXT a
+
+x = 0
+1
+FOR a = 0 TO 79
+    IF a = x THEN printText a, 2, 14, 1, CHR$(logicalExpression(a)) ELSE printText a, 2, 3, 0, CHR$(logicalExpression(a))
+NEXT a
+2
+a$ = INKEY$
+IF a$ = "" THEN GOTO 2
+
+IF a$ = CHR$(27) THEN SYSTEM
+IF a$ = CHR$(0) + "M" THEN x = x + 1
+IF a$ = CHR$(0) + "K" THEN x = x - 1
+IF x < 0 THEN x = 0
+IF x > 79 THEN x = 79
+
+IF LEN(a$) = 1 THEN
+    SELECT CASE ASC(a$)
+        CASE 32, 40, 41, 65 TO 90, 97 TO 122
+3
+            FOR a = 78 TO x STEP -1
+                logicalExpression(a + 1) = logicalExpression(a)
+            NEXT a
+            logicalExpression(x) = ASC(a$)
+            x = x + 1
+        CASE 8
+            IF x > 0 THEN
+                FOR a = x - 1 TO 78
+                    logicalExpression(a) = logicalExpression(a + 1)
+                NEXT a
+                x = x - 1
+            END IF
+        CASE 49 TO 53
+            a$ = CHR$(ASC(a$) - 48)
+            GOTO 3
+        CASE 13
+            GOTO 4
+    END SELECT
+END IF
+
+GOTO 1
+4
+
+END SUB
+
+SUB start
+' Initializes the screen and font
+prnp = 0
+
+SCREEN 7
+
+FOR a = 0 TO 122
+    LOCATE 1, 1
+    SELECT CASE a
+        CASE 7
+        CASE 1
+            LINE (0, 0)-(7, 7), 0, BF
+            LINE (2, 1)-(0, 3), 15
+            LINE (1, 4)-(2, 5), 15
+            LINE (5, 1)-(7, 3), 15
+            LINE (6, 4)-(5, 5), 15
+            LINE (1, 2)-(5, 2), 15
+            LINE (1, 4)-(5, 4), 15
+
+        CASE 2
+            LINE (0, 0)-(7, 7), 0, BF
+            LINE (5, 1)-(7, 3), 15
+            LINE (6, 4)-(5, 5), 15
+            LINE (1, 2)-(5, 2), 15
+            LINE (1, 4)-(5, 4), 15
+
+        CASE 3
+            LINE (0, 0)-(7, 7), 0, BF
+            LINE (0, 0)-(3, 7), 15
+            LINE (6, 0)-(3, 7), 15
+
+        CASE 4
+            LINE (0, 0)-(7, 7), 0, BF
+            LINE (0, 7)-(3, 0), 15
+            LINE (6, 7)-(3, 0), 15
+
+        CASE 5
+            LINE (0, 0)-(7, 7), 0, BF
+            LINE (0, 0)-(4, 0), 15
+            LINE (4, 1)-(4, 7), 15
+
+        CASE ELSE
+            PRINT CHR$(a)
+    END SELECT
+
+    FOR y = 0 TO 7
+        FOR x = 0 TO 7
+            font(x, y, a) = POINT(x, y)
+        NEXT x
+    NEXT y
+NEXT a
+
+SCREEN 12
+
+END SUB
+
+SUB tee (x1, x2)
+' Processes the logical equation and applies logical operations
+DIM opr(1 TO 2, 1 TO tehl)
+ng = 0
+ngx = 0
+oprm = 1
+oe = 0
+oex = 0
+
+FOR a = x1 TO x2
+    b = logicalExpression(a)
+    SELECT CASE b
+        CASE 40
+            c = a
+            d = 1
+10
+            c = c + 1
+            IF logicalExpression(c) = ASC("(") THEN d = d + 1
+            IF logicalExpression(c) = ASC(")") THEN d = d - 1
+            IF d = 0 THEN GOTO 11
+            GOTO 10
+11
+            tee a + 1, c - 1
+            a = c
+            FOR c = 1 TO tehl
+                opr(oprm, c) = resultValues(c)
+            NEXT c
+            GOTO 12
+        CASE 5
+            ng = 1
+            ngx = a
+        CASE 1 TO 4
+            oe = b
+            oex = a
+        CASE 65 TO 90, 97 TO 122
+            FOR c = 1 TO nm
+                IF variableNames(c) = b THEN d = c: GOTO 8
+            NEXT c
+8
+            FOR c = 1 TO tehl
+                opr(oprm, c) = variableValues(d, c)
+                printText expressionPosition(a), c, 3, 0, CHR$(variableValues(d, c))
+            NEXT c
+12
+            IF ng = 1 THEN GOSUB mkneg
+            IF oprm = 2 THEN
+                SELECT CASE oe
+                    CASE 1
+                        FOR c = 1 TO tehl
+                            d = opr(1, c)
+                            e = opr(2, c)
+                            IF d = e THEN f = ASC("t") ELSE f = ASC("v")
+                            opr(1, c) = f
+                            printText expressionPosition(oex), c, 12, 0, CHR$(f)
+                        NEXT c
+                    CASE 2
+                        FOR c = 1 TO tehl
+                            d = opr(1, c)
+                            e = opr(2, c)
+                            f = ASC("t")
+                            IF (d = ASC("t")) AND (e = ASC("v")) THEN f = ASC("v")
+                            opr(1, c) = f
+                            printText expressionPosition(oex), c, 12, 0, CHR$(f)
+                        NEXT c
+                    CASE 3
+                        FOR c = 1 TO tehl
+                            d = opr(1, c)
+                            e = opr(2, c)
+                            f = ASC("t")
+                            IF (d = ASC("v")) AND (e = ASC("v")) THEN f = ASC("v")
+                            opr(1, c) = f
+                            printText expressionPosition(oex), c, 12, 0, CHR$(f)
+                        NEXT c
+                    CASE 4
+                        FOR c = 1 TO tehl
+                            d = opr(1, c)
+                            e = opr(2, c)
+                            f = ASC("v")
+                            IF (d = ASC("t")) AND (e = ASC("t")) THEN f = ASC("t")
+                            opr(1, c) = f
+                            printText expressionPosition(oex), c, 12, 0, CHR$(f)
+                        NEXT c
+                END SELECT
+            ELSE
+                oprm = oprm + 1
+            END IF
+    END SELECT
+NEXT a
+
+GOTO 9
+
+mkneg:
+    ' NOT operation (negation) is applied to the current operand
+    FOR c = 1 TO tehl
+        d = opr(oprm, c)
+        IF d = ASC("t") THEN d = ASC("v") ELSE d = ASC("t")
+        printText expressionPosition(ngx), c, 4, 0, CHR$(d)
+        opr(oprm, c) = d
+    NEXT c
+    ng = 0
+RETURN
+9
+
+FOR c = 1 TO tehl
+    resultValues(c) = opr(1, c)
+NEXT c
+END SUB
+
+SUB teeslg (x1, x4, l)
+' Prepares the logical equation for solving by simplifying expressions within parentheses
+x2 = x4
+h = 0
+FOR e = 1 TO 4
+    g = 1
+    a = x1
+21
+    b = logicalExpression(a)
+    IF b = 40 THEN
+        c = a
+        d = 1
+14
+        c = c + 1
+        IF logicalExpression(c) = ASC("(") THEN d = d + 1
+        IF logicalExpression(c) = ASC(")") THEN d = d - 1
+        IF d = 0 THEN GOTO 15
+        GOTO 14
+15
+        IF e = 1 THEN teeslg a + 1, c - 1, l ELSE l = 0
+        a = c + l
+        x2 = x2 + l
+        h = h + l
+        GOTO 16
+    END IF
+
+    IF (b = 5) AND (e = 1) AND (g > 1) THEN
+        mov a, 1
+        logicalExpression(a) = 40
+        lendp a + 2, f
+        mov a + 2 + f, 1
+        logicalExpression(a + 2 + f) = 41
+        h = h + 2
+        x2 = x2 + 2
+        a = a + 2 + f
+        GOTO 16
+    END IF
+
+    IF (b = 3 OR b = 4) AND (e = 2) AND (g > 2) THEN
+        lendm a - 1, f
+        mov a - f, 1
+        logicalExpression(a - f) = 40
+        lendp a + 2, f
+        mov a + 2 + f, 1
+        logicalExpression(a + 2 + f) = 41
+        h = h + 2
+        x2 = x2 + 2
+        a = a + 2 + f
+        GOTO 16
+    END IF
+
+    IF (b = 2) AND (e = 3) AND (g > 3) THEN
+        lendm a - 1, f
+        mov a - f, 1
+        logicalExpression(a - f) = 40
+        lendp a + 2, f
+        mov a + 2 + f, 1
+        logicalExpression(a + 2 + f) = 41
+        h = h + 2
+        x2 = x2 + 2
+        a = a + 2 + f
+        GOTO 16
+    END IF
+
+    SELECT CASE b
+        CASE 5
+            g = 1
+        CASE 3, 4
+            g = 2
+        CASE 2
+            g = 3
+        CASE 1
+            g = 4
+    END SELECT
+16
+    a = a + 1
+    IF a <= x2 THEN GOTO 21
+NEXT e
+l = h
+END SUB
+
diff --git a/Miscellaneous/4D engine/index.html b/Miscellaneous/4D engine/index.html
new file mode 100644
index 0000000..67998b4
--- /dev/null
+++ b/Miscellaneous/4D engine/index.html	
@@ -0,0 +1,22 @@
+<HTML>
+<HEAD><TITLE>4D engine</TITLE></HEAD>
+
+<BODY>
+
+<CENTER><H1>4D engine</H1></CENTER>
+<BR>
+<BR>
+Implementation of 4 dimensional (4D) engine.
+It's like 3D but with additional extra dimension.
+
+It's possible to define objects from 4D polygons.
+In 4D world minimum amount of points to define 4D
+shape is 5. Each point will be defined by 4 coordinates (X, Y, Z, Q).
+
+You can rotate object around any axis
+(4D world has 6 rotation axes!)
+Program allows you to move along any dimension.
+
+<BR><IMG SRC="sshot.png">
+</BODY>
+</HTML>
\ No newline at end of file
diff --git a/Miscellaneous/4D engine/qeng.bas b/Miscellaneous/4D engine/qeng.bas
new file mode 100755
index 0000000..1f87299
--- /dev/null
+++ b/Miscellaneous/4D engine/qeng.bas	
@@ -0,0 +1,350 @@
+' 4D engine. It renders a 5-cell (aka. pentachoron) as a series
+' of 3D tetrahedrons with varying brightness. Brightness is used
+' to indicate shift in the fourth dimension.
+'
+' In essence, you can look at a 3D object as a series of 2D
+' cross-sections along the third dimension. Here we look at
+' a 4D object as a series of 3D cross-sections with varying
+' brightness (to distinguish between them).
+'
+' 4 dimensions also make it possible to rotate the object along
+' 6 different axes. Interestingly, the shape of the object changes
+' in 3D space when it is rotated along any of the axes that
+' involve the fourth dimension.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003.08, Initial version
+' 2024 - 2025, Improved program readability
+
+' Declare subroutines and functions that will be used in the program
+DECLARE SUB CalculateInterpolatedLine (originalX1!, originalY1!, originalZ1!, originalQ1!, originalX2!, originalY2!, originalZ2!, originalQ2!)
+DECLARE SUB RotatePoint (x1!, y1!, z1!, q1!, x4!, y4!, z4!, q4!)
+DECLARE SUB SetupPalette ()
+DECLARE SUB GetPointAtDistance (x1!, y1!, z1!, q1!, x2!, y2!, z2!, q2!, distanceFactor!, rx!, ry!, rz!, rq!)
+DECLARE SUB RenderPentachoron (ox1!, oy1!, oz1!, oq1!, ox2!, oy2!, oz2!, oq2!, ox3!, oy3!, oz3!, oq3!, ox4!, oy4!, oz4!, oq4!, ox5!, oy5!, oz5!, oq5!)
+DECLARE FUNCTION CalculateDistance (x1!, y1!, z1!, q1!, x2!, y2!, z2!, q2!)
+
+' Shared variables that can be accessed from any subroutine
+DIM SHARED screenSize
+DIM SHARED angleXZ, angleYZ, angleXY, angleQX, angleQY, angleQZ
+DIM SHARED cameraX, cameraY, cameraZ, cameraQ
+DIM SHARED pi
+DIM SHARED sineXZ, sineYZ, sineXY, sineQX, sineQY, sineQZ
+DIM SHARED cosineXZ, cosineYZ, cosineXY, cosineQX, cosineQY, cosineQZ
+
+' Arrays to store projected points and other drawing information
+DIM SHARED projectedX(1 TO 10)
+DIM SHARED projectedY(1 TO 10)
+DIM SHARED pointCount
+DIM SHARED frame
+
+' Display control instructions to the user
+PRINT ""
+PRINT " Use keys:"
+PRINT "       Rotate:"
+PRINT "               qw - XZ"
+PRINT "               as - YZ"
+PRINT "               zx - XY"
+PRINT "               er - QX"
+PRINT "               df - QY"
+PRINT "               cv - QZ"
+PRINT "       Move:"
+PRINT "               46 - x"
+PRINT "               82 - y"
+PRINT "               71 - z"
+PRINT "               -+ - q"
+PRINT
+PRINT "       ESC - to quit program"
+PRINT
+PRINT " Press any key to continue..."
+in$ = INPUT$(1)
+
+' Initialize pi value for rotation calculations
+pi = 3.1415
+
+' Initialize rotation angles for each axis
+angleXZ = pi * .5
+angleYZ = angleXZ
+angleXY = angleXZ
+angleQX = angleXZ
+angleQY = angleXZ
+angleQZ = angleXZ
+
+' Set initial camera position in 4D space
+cameraX = 0
+cameraY = 0
+cameraZ = 0
+cameraQ = .5
+
+' Set graphics mode to 640x480 with 16 colors
+SCREEN 12
+' Setup the color palette for rendering
+SetupPalette
+
+MainLoop:
+' Clear screen for new frame
+CLS
+
+' Calculate sine and cosine values for each rotation angle
+sineXZ = SIN(angleXZ): cosineXZ = COS(angleXZ)
+sineYZ = SIN(angleYZ): cosineYZ = COS(angleYZ)
+sineXY = SIN(angleXY): cosineXY = COS(angleXY)
+sineQX = SIN(angleQX): cosineQX = COS(angleQX)
+sineQY = SIN(angleQY): cosineQY = COS(angleQY)
+sineQZ = SIN(angleQZ): cosineQZ = COS(angleQZ)
+
+' Render multiple frames of the pentachoron with varying depth
+FOR frame = 1 TO 15 STEP 3
+  ' Render a pentachoron (5-cell) with the current camera position and rotation
+  RenderPentachoron -10, -10, -10, 0, 10, -10, -10, 0, 0, -10, 10, 0, 0, 10, 0, 0, 0, 0, 0, 10
+NEXT frame
+
+' Get user input for camera control
+in$ = INPUT$(1)
+
+' Handle user input for rotation and movement
+SELECT CASE in$
+CASE CHR$(27)
+  ' ESC key pressed - exit program
+  SYSTEM
+CASE "q"
+  ' Increase rotation angle along XZ axis
+  angleXZ = angleXZ + .1
+CASE "w"
+  ' Decrease rotation angle along XZ axis
+  angleXZ = angleXZ - .1
+CASE "a"
+  ' Increase rotation angle along YZ axis
+  angleYZ = angleYZ + .1
+CASE "s"
+  ' Decrease rotation angle along YZ axis
+  angleYZ = angleYZ - .1
+CASE "z"
+  ' Increase rotation angle along XY axis
+  angleXY = angleXY + .1
+CASE "x"
+  ' Decrease rotation angle along XY axis
+  angleXY = angleXY - .1
+CASE "e"
+  ' Increase rotation angle along QX axis
+  angleQX = angleQX + .1
+CASE "r"
+  ' Decrease rotation angle along QX axis
+  angleQX = angleQX - .1
+CASE "d"
+  ' Increase rotation angle along QY axis
+  angleQY = angleQY + .1
+CASE "f"
+  ' Decrease rotation angle along QY axis
+  angleQY = angleQY - .1
+CASE "c"
+  ' Increase rotation angle along QZ axis
+  angleQZ = angleQZ + .1
+CASE "v"
+  ' Decrease rotation angle along QZ axis
+  angleQZ = angleQZ - .1
+
+' Handle user input for movement in the 4D space
+CASE "4"
+  ' Move camera left along X axis
+  cameraX = cameraX - 3
+CASE "6"
+  ' Move camera right along X axis
+  cameraX = cameraX + 3
+CASE "8"
+  ' Move camera forward along Z axis
+  cameraZ = cameraZ + 3
+CASE "2"
+  ' Move camera backward along Z axis
+  cameraZ = cameraZ - 3
+CASE "7"
+  ' Move camera up along Y axis
+  cameraY = cameraY + 3
+CASE "1"
+  ' Move camera down along Y axis
+  cameraY = cameraY - 3
+CASE "+"
+  ' Move camera forward along Q axis (4th dimension)
+  cameraQ = cameraQ + .3
+CASE "-"
+  ' Move camera backward along Q axis (4th dimension)
+  cameraQ = cameraQ - .3
+
+END SELECT
+
+' Loop back to render next frame
+GOTO MainLoop
+
+' Function to calculate the distance between two points in 4D space
+FUNCTION CalculateDistance (x1, y1, z1, q1, x2, y2, z2, q2)
+  ' Calculate Euclidean distance in 4D space
+  CalculateDistance = SQR((x1 - x2) ^ 2 + (y1 - y2) ^ 2 + (z1 - z2) ^ 2 + (q1 - q2) ^ 2)
+END FUNCTION
+
+' Subroutine to calculate the linear interpolation between two points
+SUB CalculateInterpolatedLine (originalX1, originalY1, originalZ1, originalQ1, originalX2, originalY2, originalZ2, originalQ2)
+  ' Local variables to store coordinates of the two points
+  x1 = originalX1: y1 = originalY1: z1 = originalZ1: q1 = originalQ1
+  x2 = originalX2: y2 = originalY2: z2 = originalZ2: q2 = originalQ2
+
+  ' If the first point is in front of the camera and the second is behind,
+  ' swap them to ensure proper rendering order
+  IF (q1 > cameraQ) AND (q2 < cameraQ) THEN
+    SWAP x1, x2
+    SWAP y1, y2
+    SWAP z1, z2
+    SWAP q1, q2
+  END IF
+
+  ' If the first point is in front of the camera and the second is behind,
+  ' calculate the intersection point where the line segment crosses the camera plane
+  IF (q1 < cameraQ) AND (q2 > cameraQ) THEN
+    ' Calculate the difference in Q coordinates
+    qDifference = q2 - q1
+    ' Calculate how far along the line segment we need to go to reach the camera plane
+    qToCamera = cameraQ - q1
+    ' Calculate the interpolation factor
+    interpolationFactor = qToCamera / qDifference
+    ' Increment point counter
+    pointCount = pointCount + 1
+    ' Calculate interpolated coordinates
+    interpolatedX = (x2 - x1) * interpolationFactor + x1
+    interpolatedY = (y2 - y1) * interpolationFactor + y1
+    interpolatedZ = (z2 - z1) * interpolationFactor + z1 + 50
+    ' Project 3D coordinates to 2D screen coordinates and store them
+    projectedX(pointCount) = interpolatedX / interpolatedZ * 700 + 320
+    projectedY(pointCount) = interpolatedY / interpolatedZ * 700 + 240
+  END IF
+END SUB
+
+' Subroutine to get a point at a specific distance along the line segment
+SUB GetPointAtDistance (x1, y1, z1, q1, x2, y2, z2, q2, distanceFactor, rx, ry, rz, rq)
+  ' Calculate the vector between the two points
+  xVector = x2 - x1
+  yVector = y2 - y1
+  zVector = z2 - z1
+  qVector = q2 - q1
+
+  ' Calculate the coordinates of the point at the specified distance along the line segment
+  rx = x1 + (xVector * distanceFactor)
+  ry = y1 + (yVector * distanceFactor)
+  rz = z1 + (zVector * distanceFactor)
+  rq = q1 + (qVector * distanceFactor)
+END SUB
+
+' Subroutine to render a 3D tetrahedron with varying brightness
+SUB RenderPentachoron (originalX1, originalY1, originalZ1, originalQ1, originalX2, originalY2, originalZ2, originalQ2, originalX3, originalY3, originalZ3, originalQ3, originalX4, originalY4, originalZ4, originalQ4, originalX5, originalY5, originalZ5 _
+, originalQ5)
+
+  ' Adjust coordinates based on camera position and frame depth
+  originalX1 = originalX1 - cameraX
+  originalY1 = originalY1 - cameraY
+  originalZ1 = originalZ1 - cameraZ
+  originalQ1 = originalQ1 - cameraQ - frame
+
+  originalX2 = originalX2 - cameraX
+  originalY2 = originalY2 - cameraY
+  originalZ2 = originalZ2 - cameraZ
+  originalQ2 = originalQ2 - cameraQ - frame
+
+  originalX3 = originalX3 - cameraX
+  originalY3 = originalY3 - cameraY
+  originalZ3 = originalZ3 - cameraZ
+  originalQ3 = originalQ3 - cameraQ - frame
+
+  originalX4 = originalX4 - cameraX
+  originalY4 = originalY4 - cameraY
+  originalZ4 = originalZ4 - cameraZ
+  originalQ4 = originalQ4 - cameraQ - frame
+
+  originalX5 = originalX5 - cameraX
+  originalY5 = originalY5 - cameraY
+  originalZ5 = originalZ5 - cameraZ
+  originalQ5 = originalQ5 - cameraQ - frame
+
+  ' Rotate all points based on current rotation angles
+  RotatePoint originalX1, originalY1, originalZ1, originalQ1, x1, y1, z1, q1
+  RotatePoint originalX2, originalY2, originalZ2, originalQ2, x2, y2, z2, q2
+  RotatePoint originalX3, originalY3, originalZ3, originalQ3, x3, y3, z3, q3
+  RotatePoint originalX4, originalY4, originalZ4, originalQ4, x4, y4, z4, q4
+  RotatePoint originalX5, originalY5, originalZ5, originalQ5, x5, y5, z5, q5
+
+  ' Initialize point counter
+  pointCount = 0
+
+  ' Calculate interpolated points for all edges of the pentachoron
+  CalculateInterpolatedLine x1, y1, z1, q1, x2, y2, z2, q2
+  CalculateInterpolatedLine x1, y1, z1, q1, x3, y3, z3, q3
+  CalculateInterpolatedLine x1, y1, z1, q1, x4, y4, z4, q4
+  CalculateInterpolatedLine x1, y1, z1, q1, x5, y5, z5, q5
+
+  CalculateInterpolatedLine x2, y2, z2, q2, x3, y3, z3, q3
+  CalculateInterpolatedLine x2, y2, z2, q2, x4, y4, z4, q4
+  CalculateInterpolatedLine x2, y2, z2, q2, x5, y5, z5, q5
+
+  CalculateInterpolatedLine x3, y3, z3, q3, x4, y4, z4, q4
+  CalculateInterpolatedLine x3, y3, z3, q3, x5, y5, z5, q5
+
+  CalculateInterpolatedLine x4, y4, z4, q4, x5, y5, z5, q5
+
+  ' Draw lines between each pair of interpolated points
+  FOR pointA = 1 TO pointCount
+    FOR pointB = pointA + 1 TO pointCount
+      ' Draw line with color based on frame depth (for varying brightness)
+      LINE (projectedX(pointA), projectedY(pointA))-(projectedX(pointB), projectedY(pointB)), 15 - frame
+    NEXT pointB
+  NEXT pointA
+
+END SUB
+
+' Subroutine to rotate a point along the specified axes
+SUB RotatePoint (x1, y1, z1, q1, x4, y4, z4, q4)
+
+  ' Rotate the point along the QX axis
+  q2 = q1 * sineQX - x1 * cosineQX
+  x2 = q1 * cosineQX + x1 * sineQX
+
+  ' Rotate the point along the QY axis
+  q3 = q2 * sineQY - y1 * cosineQY
+  y2 = q2 * cosineQY + y1 * sineQY
+
+  ' Rotate the point along the QZ axis
+  q4 = q3 * sineQZ - z1 * cosineQZ
+  z2 = q3 * cosineQZ + z1 * sineQZ
+
+  ' Rotate the point along the XZ axis
+  x3 = x2 * sineXZ - z2 * cosineXZ
+  z3 = x2 * cosineXZ + z2 * sineXZ
+
+  ' Rotate the point along the YZ axis
+  y3 = y2 * sineYZ - z3 * cosineYZ
+  z4 = y2 * cosineYZ + z3 * sineYZ
+
+  ' Rotate the point along the XY axis
+  y4 = y3 * sineXY - x3 * cosineXY
+  x4 = y3 * cosineXY + x3 * sineXY
+
+END SUB
+
+' Subroutine to set up the color palette
+SUB SetupPalette
+
+  ' Set up a grayscale color palette
+  FOR colorIndex = 0 TO 15
+    ' Set palette register
+    OUT &H3C8, colorIndex
+    ' Set RGB values (all equal for grayscale)
+    OUT &H3C9, colorIndex * 4
+    OUT &H3C9, colorIndex * 4
+    OUT &H3C9, colorIndex * 4
+    ' Draw a vertical line with this color to visualize the palette
+    LINE (colorIndex, 0)-(colorIndex, 400), colorIndex
+  NEXT colorIndex
+
+END SUB
+
diff --git a/Miscellaneous/4D engine/sshot.png b/Miscellaneous/4D engine/sshot.png
new file mode 100644
index 0000000..03e6e3e
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diff --git a/Miscellaneous/Alien font.bas b/Miscellaneous/Alien font.bas
new file mode 100644
index 0000000..cdbc6fc
--- /dev/null
+++ b/Miscellaneous/Alien font.bas	
@@ -0,0 +1,112 @@
+' Program attempts to render imaginary alien text.
+' Text is composed by subdividing square into 4 triangles.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001,    Initial version.
+' 2024.08, Improved code readability.
+
+DEFINT A-Z
+
+' Declare the subroutine which will draw a character at a given position with a given size and color
+DECLARE SUB DrawCharacter (characterX, characterY, characterColor, CharacterSize)
+
+' Define shared array for colors
+DIM SHARED characterColors(1 TO 4) AS INTEGER
+
+' Initialize the color palette
+characterColors(1) = 7 ' LightGray
+characterColors(2) = 7 ' LightGray
+characterColors(3) = 0 ' Black
+characterColors(4) = 0 ' Black
+
+' Set the screen mode and seed the random number generator
+SCREEN 12
+RANDOMIZE TIMER
+
+' Clear the screen with black color
+PAINT (1, 1), 0
+
+' Define the size of each character
+CONST CharacterSize = 4
+
+' Initialize counters for drawing characters
+DIM tmp AS INTEGER
+tmp = 0
+
+' Outer loop for vertical positioning of characters
+FOR characterY = 1 TO 480 - CharacterSize - 2 STEP CharacterSize + (CharacterSize \ 2)
+    DIM tmp1 AS INTEGER
+    tmp1 = 0
+
+    ' Inner loop for horizontal positioning of characters
+    FOR characterX = 1 TO 640 - CharacterSize - 2 STEP CharacterSize + (CharacterSize \ 2)
+        ' Draw a character with random color and specified size at the current position
+        CALL DrawCharacter(characterX, characterY, INT(RND * 16), CharacterSize)
+
+        ' Increment the inner loop counter
+        tmp1 = tmp1 + 1
+
+        ' Add spaces to emulate visual character clusters
+        IF tmp1 > 20 THEN
+            tmp1 = 0
+            characterX = characterX + (CharacterSize)
+        END IF
+    NEXT characterX
+
+    ' Increment the outer loop counter
+    tmp = tmp + 1
+
+    ' Add space to group caracters visually into clusters
+    IF tmp > 5 THEN
+        tmp = 0
+        characterY = characterY + (CharacterSize)
+    END IF
+NEXT characterY
+
+' Subroutine to draw a character at a given position with a given size and color
+SUB DrawCharacter (characterX AS INTEGER, characterY AS INTEGER, characterColor AS INTEGER, CharacterSize AS INTEGER)
+    ' Calculate half the size of the character for drawing diagonals
+    DIM halfSize AS INTEGER
+    halfSize = CharacterSize \ 2
+
+    ' Randomly select a color from the palette
+    DIM randomColor AS INTEGER
+    randomColor = characterColors(INT(RND * 3) + 1)
+
+    ' Draw the top horizontal line and diagonals of the character
+    LINE (characterX, characterY)-(characterX + CharacterSize, characterY), randomColor
+    LINE (characterX, characterY)-(characterX + halfSize, characterY + halfSize), randomColor
+    LINE (characterX + CharacterSize, characterY)-(characterX + halfSize, characterY + halfSize), randomColor
+    ' Fill the top right corner of the character
+    PAINT (characterX + 2, characterY + 1), randomColor
+
+    ' Draw the left vertical line and diagonals of the character
+    randomColor = characterColors(INT(RND * 3) + 1)
+    LINE (characterX, characterY)-(characterX, characterY + CharacterSize), randomColor
+    LINE (characterX, characterY)-(characterX + halfSize, characterY + halfSize), randomColor
+    LINE (characterX, characterY + CharacterSize)-(characterX + halfSize, characterY + halfSize), randomColor
+    ' Fill the middle left of the character
+    PAINT (characterX + 1, characterY + 2), randomColor
+
+    ' Draw the right vertical line and diagonals of the character
+    randomColor = characterColors(INT(RND * 3) + 1)
+    LINE (characterX + CharacterSize, characterY)-(characterX + CharacterSize, characterY + CharacterSize), randomColor
+    LINE (characterX + CharacterSize, characterY)-(characterX + halfSize, characterY + halfSize), randomColor
+    LINE (characterX + CharacterSize, characterY + CharacterSize)-(characterX + halfSize, characterY + halfSize), randomColor
+    ' Fill the middle right of the character
+    PAINT (characterX + CharacterSize - 1, characterY + 2), randomColor
+
+    ' Draw the bottom horizontal line and diagonals of the character
+    randomColor = characterColors(INT(RND * 3) + 1)
+    LINE (characterX, characterY + CharacterSize)-(characterX + CharacterSize, characterY + CharacterSize), randomColor
+    LINE (characterX, characterY + CharacterSize)-(characterX + halfSize, characterY + halfSize), randomColor
+    LINE (characterX + CharacterSize, characterY + CharacterSize)-(characterX + halfSize, characterY + halfSize), randomColor
+    ' Fill the bottom left corner of the character
+    PAINT (characterX + 2, characterY + CharacterSize - 1), randomColor
+END SUB
+
diff --git a/Miscellaneous/Alien font.png b/Miscellaneous/Alien font.png
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diff --git a/Miscellaneous/Automated school clock/v1/Electronics/3 key keyboard.png b/Miscellaneous/Automated school clock/v1/Electronics/3 key keyboard.png
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diff --git a/Miscellaneous/Automated school clock/v1/Electronics/4.png b/Miscellaneous/Automated school clock/v1/Electronics/4.png
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diff --git a/Miscellaneous/Automated school clock/v1/Electronics/skeem.png b/Miscellaneous/Automated school clock/v1/Electronics/skeem.png
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diff --git a/Miscellaneous/Automated school clock/v1/README.html b/Miscellaneous/Automated school clock/v1/README.html
new file mode 100644
index 0000000..d7dc1d0
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/README.html	
@@ -0,0 +1,473 @@
+<!doctype html>
+<html lang="en">
+<head>
+<title>juhend</title>
+<!-- 2018-04-20 Fri 11:08 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+
+<link  href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+/* org mode styles on top of twbs */
+
+html {
+    position: relative;
+    min-height: 100%;
+}
+
+body {
+    font-size: 18px;
+    margin-bottom: 105px;
+}
+
+footer {
+    position: absolute;
+    bottom: 0;
+    width: 100%;
+    height: 101px;
+    background-color: #f5f5f5;
+}
+
+footer > div {
+    padding: 10px;
+}
+
+footer p {
+    margin: 0 0 5px;
+    text-align: center;
+    font-size: 16px;
+}
+
+#table-of-contents {
+    margin-top: 20px;
+    margin-bottom: 20px;
+}
+
+blockquote p {
+    font-size: 18px;
+}
+
+pre {
+    font-size: 16px;
+}
+
+.footpara {
+    display: inline-block;
+}
+
+figcaption {
+  font-size: 16px;
+  color: #666;
+  font-style: italic;
+  padding-bottom: 15px;
+}
+
+/* from twbs docs */
+
+.bs-docs-sidebar.affix {
+    position: static;
+}
+@media (min-width: 768px) {
+    .bs-docs-sidebar {
+        padding-left: 20px;
+    }
+}
+
+/* All levels of nav */
+.bs-docs-sidebar .nav > li > a {
+    display: block;
+    padding: 4px 20px;
+    font-size: 14px;
+    font-weight: 500;
+    color: #999;
+}
+.bs-docs-sidebar .nav > li > a:hover,
+.bs-docs-sidebar .nav > li > a:focus {
+    padding-left: 19px;
+    color: #A1283B;
+    text-decoration: none;
+    background-color: transparent;
+    border-left: 1px solid #A1283B;
+}
+.bs-docs-sidebar .nav > .active > a,
+.bs-docs-sidebar .nav > .active:hover > a,
+.bs-docs-sidebar .nav > .active:focus > a {
+    padding-left: 18px;
+    font-weight: bold;
+    color: #A1283B;
+    background-color: transparent;
+    border-left: 2px solid #A1283B;
+}
+
+/* Nav: second level (shown on .active) */
+.bs-docs-sidebar .nav .nav {
+    display: none; /* Hide by default, but at >768px, show it */
+    padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav > li > a {
+    padding-top: 1px;
+    padding-bottom: 1px;
+    padding-left: 30px;
+    font-size: 12px;
+    font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav > li > a:focus {
+    padding-left: 29px;
+}
+.bs-docs-sidebar .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav > .active:focus > a {
+    padding-left: 28px;
+    font-weight: 500;
+}
+
+/* Nav: third level (shown on .active) */
+.bs-docs-sidebar .nav .nav .nav {
+    padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a {
+    padding-top: 1px;
+    padding-bottom: 1px;
+    padding-left: 40px;
+    font-size: 12px;
+    font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav .nav > li > a:focus {
+    padding-left: 39px;
+}
+.bs-docs-sidebar .nav .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
+    padding-left: 38px;
+    font-weight: 500;
+}
+
+/* Show and affix the side nav when space allows it */
+@media (min-width: 992px) {
+    .bs-docs-sidebar .nav > .active > ul {
+        display: block;
+    }
+    /* Widen the fixed sidebar */
+    .bs-docs-sidebar.affix,
+    .bs-docs-sidebar.affix-bottom {
+        width: 213px;
+    }
+    .bs-docs-sidebar.affix {
+        position: fixed; /* Undo the static from mobile first approach */
+        top: 20px;
+    }
+    .bs-docs-sidebar.affix-bottom {
+        position: absolute; /* Undo the static from mobile first approach */
+    }
+    .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
+        margin-top: 0;
+        margin-bottom: 0
+    }
+}
+@media (min-width: 1200px) {
+    /* Widen the fixed sidebar again */
+    .bs-docs-sidebar.affix-bottom,
+    .bs-docs-sidebar.affix {
+        width: 263px;
+    }
+}
+</style>
+<script type="text/javascript">
+$(function() {
+    'use strict';
+
+    $('.bs-docs-sidebar li').first().addClass('active');
+
+    $(document.body).scrollspy({target: '.bs-docs-sidebar'});
+
+    $('.bs-docs-sidebar').affix();
+});
+</script>
+</head>
+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">juhend</h1>
+<p>
+Kooli Kell programmi kasutusjuhend
+</p>
+
+<ul class="org-ul">
+<li>2002.10
+</li>
+<li>Svjatoslav Agejenko
+</li>
+</ul>
+
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> Kasutajaliides</h2>
+<div class="outline-text-2" id="text-1">
+<p>
+Programm Kooli Kell on mõldud kella laskmiseks koolis, tundi sisse ja
+välja.  Samuti juhib programm arvuti küljes olevat liidest,
+kahekohaliste numbrite näitamiseks (minutid / tunnid), 3 klahvilist
+klaviatuuri ja releed.  Tundi sisse minev kell on 1 pikk ning 1 l”em
+helin. Väljaminev kell on 1 tavaline pikk helin. Programm loeb aega
+arvuti süsteemsest kellast.  Kella laskmis ajad on organiseeritud
+failidesse *.PP .  Aasta või päevaplaani muutmiseks tuleb redakteerida
+vastavaid faile. Programm valib sobiva päevaplaani lähtudes
+aastaplaanist, mis asub failis "aasta.ap" . Programmi saab kasutada
+arvutil millele on printeri pesasse (LPT1) ”endatud spetsiaalne
+liides, liidese skeem on failis "skeem.bmp". Liides omab kolme
+nummerdatud nuppu paigutusega:
+</p>
+
+<p class="verse">
+&lt;1&gt;   &lt;2&gt;<br >
+&#xa0;&#xa0;&#xa0;&lt;3&gt;<br >
+</p>
+
+<p>
+Programm on ettenähtud iseseisvalt töötama, kuid on ka võimalus
+erandkorras kгitsi kella lasta, aega muuta jne.. Programm eristab
+tavalisi nupuvajutusi ja topeltklõpse. Eesmärgiga suurendada
+funktsionaalsust väheste nuppudega.
+</p>
+</div>
+
+<div id="outline-container-sec-1-1" class="outline-3">
+<h3 id="sec-1-1"><span class="section-number-3">1.1</span> Nuppude funktsioonid peamenüüs:</h3>
+<div class="outline-text-3" id="text-1-1">
+<dl class="org-dl">
+<dt> &lt;1&gt; klõps </dt><dd>laseb kella tundi sisse
+</dd>
+<dt> &lt;1&gt; topeltklõps </dt><dd>laseb kella tunnist välja
+</dd>
+
+<dt> &lt;2&gt; klõps </dt><dd>läheb aja muutmis menüüsse
+</dd>
+<dt> &lt;3&gt; topeltklõps </dt><dd>hakkab tööle uuendatud graafikuga, vajalik pвast
+sisendfailide redigeerimist.
+</dd>
+
+<dt> &lt;3&gt; klõps </dt><dd>ümardab süsteemse aja täistunnini, vajalik aja
+sünkroniseerimiseks.
+</dd>
+<dt> &lt;3&gt; topeltklõps </dt><dd>laeb süsteemse: aasta, kuu, päeva, tunnid,
+minutid failist "sync.txt"
+</dd>
+</dl>
+</div>
+</div>
+
+<div id="outline-container-sec-1-2" class="outline-3">
+<h3 id="sec-1-2"><span class="section-number-3">1.2</span> Nuppude funktsioonid aja muutmis menüüs:</h3>
+<div class="outline-text-3" id="text-1-2">
+<dl class="org-dl">
+<dt> &lt;1&gt; klõps </dt><dd>vähendab süsteemsed tunnid/minutid 1. võrra
+</dd>
+
+<dt> &lt;2&gt; klõps </dt><dd>suurendab süsteemsed tunnid/minutid 1. võrra
+</dd>
+
+<dt> &lt;3&gt; klõps </dt><dd>valib näitamiseks ja redigeerimiseks tunnid või minutid.
+</dd>
+<dt> &lt;3&gt; topeltklõps </dt><dd>läheb tagasi peamenüüsse.
+</dd>
+</dl>
+
+<p>
+Aja muutmis menüüd tunneb ära selle järgi et indikaator tunnid või
+minutid vilgub, mitte ei põle nagu peamenüüs.
+</p>
+</div>
+</div>
+</div>
+
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Faili AASTA.AP formaat: (aastaplaan)</h2>
+<div class="outline-text-2" id="text-2">
+<pre class="example">
+v       &lt;kuu&gt;-&lt;päev&gt;     &lt;kuu&gt;-&lt;päev&gt;     &lt;päevaplaan&gt;
+</pre>
+
+<p>
+Sõnast aja vahemik. Paneb paika päevaplaani antud
+ajavahemikus. Esimene daatum peab kindlasti olema väiksem kui
+teine. St. kui on tõesti vaja:
+</p>
+
+<pre class="example">
+v       10-4    2-1     eri
+</pre>
+
+<p>
+tuleb kirjutada:
+</p>
+
+<pre class="example">
+v       10-4    12-31   eri
+v       1-1     2-1     eri
+</pre>
+
+<p>
+Päevaplaan kehtib vahemiku esimesest päevast kuni vahemiku viimase
+päevani.
+</p>
+
+
+<pre class="example">
+n       &lt;kuu&gt;-&lt;päev&gt;     &lt;kuu&gt;-&lt;päev&gt;     &lt;nädalapäev&gt;      &lt;päevaplaan&gt;
+</pre>
+
+<p>
+Sõnast nädalapäv. sama mis "v" kuid: paneb paika päevaplaani antud
+ajavahemikus, antud nädalapäeval. Nädalapäeva kirjeldatakse numbriga.
+nädala esimene päev on esmaspäev, talle vastab number 1.
+</p>
+
+
+<pre class="example">
+e       &lt;kuu&gt;-&lt;päev&gt; &lt;päevaplaan&gt;
+</pre>
+
+<p>
+Sõnast eriline. Paneb paika antud kuupävale antud pävaplaani. Sobib
+hästi erakorraliste lüendatud või muul moel muudetud päevaplaanide
+kehtestamiseks. Näiteks riigipühad, spordipäev jne.
+</p>
+
+<p>
+Kui teatud päeva kohta ei käinud ühtegi kirjet siis toimib vaikimisi
+"tuhi" päevaplaan. Kui teatud päeva kohta käis mitu kirjet siis jääb
+peale viimane.
+</p>
+</div>
+</div>
+
+
+
+<div id="outline-container-sec-3" class="outline-2">
+<h2 id="sec-3"><span class="section-number-2">3</span> Failide *.PP formaat: (päevaplaanid)</h2>
+<div class="outline-text-2" id="text-3">
+<pre class="example">
+# &lt;tund&gt;:&lt;minut&gt;  &lt;kell&gt;
+</pre>
+
+<p>
+Laseb antud ajal antud kella. Võimalikud kella helinad on:
+</p>
+
+<table class="table table-striped table-bordered table-hover table-condensed">
+
+
+<colgroup>
+<col  class="left">
+
+<col  class="left">
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="text-left">kella kood</th>
+<th scope="col" class="text-left">vastav helin</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="text-left">sis</td>
+<td class="text-left">kell tundi sisse</td>
+</tr>
+
+<tr>
+<td class="text-left">val</td>
+<td class="text-left">kell tunnist välja</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-sec-4" class="outline-2">
+<h2 id="sec-4"><span class="section-number-2">4</span> Faili SYNC.TXT formaat:</h2>
+<div class="outline-text-2" id="text-4">
+<p>
+faili esimesel kahel real peab olema järgnev:
+</p>
+
+<pre class="example">
+KK-PP-AAAA
+TT:MM
+</pre>
+
+<p>
+kus:
+</p>
+<table class="table table-striped table-bordered table-hover table-condensed">
+
+
+<colgroup>
+<col  class="left">
+
+<col  class="left">
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="text-left">kood</th>
+<th scope="col" class="text-left">tähendus</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="text-left">KK</td>
+<td class="text-left">kuu</td>
+</tr>
+
+<tr>
+<td class="text-left">PP</td>
+<td class="text-left">päev</td>
+</tr>
+
+<tr>
+<td class="text-left">AAAA</td>
+<td class="text-left">aasta</td>
+</tr>
+
+<tr>
+<td class="text-left">TT</td>
+<td class="text-left">tunnid</td>
+</tr>
+
+<tr>
+<td class="text-left">MM</td>
+<td class="text-left">minutid</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. Kasutajaliides</a>
+<ul class="nav">
+<li><a href="#sec-1-1">1.1. Nuppude funktsioonid peamenüüs:</a></li>
+<li><a href="#sec-1-2">1.2. Nuppude funktsioonid aja muutmis menüüs:</a></li>
+</ul>
+</li>
+<li><a href="#sec-2">2. Faili AASTA.AP formaat: (aastaplaan)</a></li>
+<li><a href="#sec-3">3. Failide *.PP formaat: (päevaplaanid)</a></li>
+<li><a href="#sec-4">4. Faili SYNC.TXT formaat:</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2018-04-20 Fri 11:08</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 25.1.1 (<a href="http://orgmode.org">Org-mode</a> 8.2.10)</p>
+</div>
+</footer>
+</body>
+</html>
diff --git a/Miscellaneous/Automated school clock/v1/README.org b/Miscellaneous/Automated school clock/v1/README.org
new file mode 100644
index 0000000..b153ade
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/README.org	
@@ -0,0 +1,115 @@
+Kooli Kell programmi kasutusjuhend
+
+- 2002.10
+- Svjatoslav Agejenko
+
+
+* Kasutajaliides
+Programm Kooli Kell on mõldud kella laskmiseks koolis, tundi sisse ja
+välja.  Samuti juhib programm arvuti küljes olevat liidest,
+kahekohaliste numbrite näitamiseks (minutid / tunnid), 3 klahvilist
+klaviatuuri ja releed.  Tundi sisse minev kell on 1 pikk ning 1 l”em
+helin. Väljaminev kell on 1 tavaline pikk helin. Programm loeb aega
+arvuti süsteemsest kellast.  Kella laskmis ajad on organiseeritud
+failidesse *.PP .  Aasta või päevaplaani muutmiseks tuleb redakteerida
+vastavaid faile. Programm valib sobiva päevaplaani lähtudes
+aastaplaanist, mis asub failis "aasta.ap" . Programmi saab kasutada
+arvutil millele on printeri pesasse (LPT1) ”endatud spetsiaalne
+liides, liidese skeem on failis "skeem.bmp". Liides omab kolme
+nummerdatud nuppu paigutusega:
+
+#+BEGIN_VERSE
+        <1>   <2>
+           <3>
+#+END_VERSE
+
+Programm on ettenähtud iseseisvalt töötama, kuid on ka võimalus
+erandkorras kгitsi kella lasta, aega muuta jne.. Programm eristab
+tavalisi nupuvajutusi ja topeltklõpse. Eesmärgiga suurendada
+funktsionaalsust väheste nuppudega.
+
+** Nuppude funktsioonid peamenüüs:
+
++ <1> klõps :: laseb kella tundi sisse
++ <1> topeltklõps :: laseb kella tunnist välja
+
++ <2> klõps :: läheb aja muutmis menüüsse
++ <3> topeltklõps :: hakkab tööle uuendatud graafikuga, vajalik pвast
+     sisendfailide redigeerimist.
+
++ <3> klõps :: ümardab süsteemse aja täistunnini, vajalik aja
+               sünkroniseerimiseks.
++ <3> topeltklõps :: laeb süsteemse: aasta, kuu, päeva, tunnid,
+     minutid failist "sync.txt"
+
+** Nuppude funktsioonid aja muutmis menüüs:
+
++ <1> klõps :: vähendab süsteemsed tunnid/minutid 1. võrra
+
++ <2> klõps :: suurendab süsteemsed tunnid/minutid 1. võrra
+
++ <3> klõps :: valib näitamiseks ja redigeerimiseks tunnid või minutid.
++ <3> topeltklõps :: läheb tagasi peamenüüsse.
+
+Aja muutmis menüüd tunneb ära selle järgi et indikaator tunnid või
+minutid vilgub, mitte ei põle nagu peamenüüs.
+
+* Faili AASTA.AP formaat: (aastaplaan)
+: v       <kuu>-<päev>     <kuu>-<päev>     <päevaplaan>
+
+Sõnast aja vahemik. Paneb paika päevaplaani antud
+ajavahemikus. Esimene daatum peab kindlasti olema väiksem kui
+teine. St. kui on tõesti vaja:
+
+: v       10-4    2-1     eri
+
+tuleb kirjutada:
+
+: v       10-4    12-31   eri
+: v       1-1     2-1     eri
+
+Päevaplaan kehtib vahemiku esimesest päevast kuni vahemiku viimase
+päevani.
+
+
+: n       <kuu>-<päev>     <kuu>-<päev>     <nädalapäev>      <päevaplaan>
+
+Sõnast nädalapäv. sama mis "v" kuid: paneb paika päevaplaani antud
+ajavahemikus, antud nädalapäeval. Nädalapäeva kirjeldatakse numbriga.
+nädala esimene päev on esmaspäev, talle vastab number 1.
+
+
+: e       <kuu>-<päev> <päevaplaan>
+
+Sõnast eriline. Paneb paika antud kuupävale antud pävaplaani. Sobib
+hästi erakorraliste lüendatud või muul moel muudetud päevaplaanide
+kehtestamiseks. Näiteks riigipühad, spordipäev jne.
+
+Kui teatud päeva kohta ei käinud ühtegi kirjet siis toimib vaikimisi
+"tuhi" päevaplaan. Kui teatud päeva kohta käis mitu kirjet siis jääb
+peale viimane.
+
+* Failide *.PP formaat: (päevaplaanid)
+: # <tund>:<minut>  <kell>
+
+Laseb antud ajal antud kella. Võimalikud kella helinad on:
+
+| kella kood | vastav helin       |
+|------------+--------------------|
+| sis        | kell tundi sisse   |
+| val        | kell tunnist välja |
+
+* Faili SYNC.TXT formaat:
+faili esimesel kahel real peab olema järgnev:
+
+: KK-PP-AAAA
+: TT:MM
+
+kus:
+| kood | tähendus |
+|------+----------|
+| KK   | kuu      |
+| PP   | päev     |
+| AAAA | aasta    |
+| TT   | tunnid   |
+| MM   | minutid  |
diff --git a/Miscellaneous/Automated school clock/v1/aasta.ap b/Miscellaneous/Automated school clock/v1/aasta.ap
new file mode 100644
index 0000000..ef1b084
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/aasta.ap	
@@ -0,0 +1,7 @@
+v	01-01 	12-31	tava
+n	01-01	12-31	5	reede
+e	10-04	opetajap
+e	10-31	rebased
+n	01-01	12-31	6	tuhi
+n	01-01	12-31	7	tuhi
+
diff --git a/Miscellaneous/Automated school clock/v1/autoexec.bat b/Miscellaneous/Automated school clock/v1/autoexec.bat
new file mode 100755
index 0000000..cd7ae3c
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/autoexec.bat	
@@ -0,0 +1,2 @@
+coff
+qb /run kk.bas
\ No newline at end of file
diff --git a/Miscellaneous/Automated school clock/v1/coff.asm b/Miscellaneous/Automated school clock/v1/coff.asm
new file mode 100644
index 0000000..0466c15
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/coff.asm	
@@ -0,0 +1,4 @@
+mov	dx, 37Ah
+mov	al, 0
+out	dx, al
+ret
\ No newline at end of file
diff --git a/Miscellaneous/Automated school clock/v1/coff.com b/Miscellaneous/Automated school clock/v1/coff.com
new file mode 100755
index 0000000..2537f6d
Binary files /dev/null and b/Miscellaneous/Automated school clock/v1/coff.com differ
diff --git a/Miscellaneous/Automated school clock/v1/ekr.bas b/Miscellaneous/Automated school clock/v1/ekr.bas
new file mode 100755
index 0000000..67ac754
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/ekr.bas	
@@ -0,0 +1,70 @@
+DECLARE SUB jooks ()
+DECLARE SUB suva ()
+DECLARE SUB display ()
+DECLARE SUB clearBits ()
+DEFINT A-Z
+DIM SHARED bit(0 TO 16)
+
+suva
+jooks
+
+clearBits
+bit(10) = 0
+bit(14) = 0
+bit(6) = 0
+bit(2) = 0
+4
+GOTO 4
+
+SUB clearBits
+' This subroutine initializes all bits in the bit array to 1
+FOR a = 1 TO 16
+    bit(a) = 1
+NEXT a
+
+END SUB
+
+SUB display
+' This subroutine displays the current state of the bit array using LPT attached display
+prt = &H378
+d = 0
+FOR a = 0 TO 3
+    c = 2 ^ a
+    FOR b = 4 TO 7
+        d = d + 1
+        c = c + (bit(d) * 2 ^ b)
+    NEXT b
+
+    OUT prt, c
+NEXT a
+END SUB
+
+SUB jooks
+' This subroutine demonstrates a simple counting
+2
+clearBits
+FOR a = 1 TO 16
+    bit(16) = 1 ' Set the most significant bit to 1
+    bit(a - 1) = 1 ' Set the previous bit to 1
+    bit(a) = 0 ' Clear the current bit
+    PRINT a
+    FOR b = 1 TO 1000
+        display
+    NEXT b
+NEXT a
+GOTO 2
+END SUB
+
+SUB suva
+' This subroutine demonstrates a simple random bit setting algorithm
+3
+clearBits
+FOR b = 1 TO 16
+    IF RND * 100 > 50 THEN bit(b) = 0 ' Randomly set bits to 0
+NEXT b
+FOR b = 1 TO 100
+    display
+NEXT b
+GOTO 3
+END SUB
+
diff --git a/Miscellaneous/Automated school clock/v1/kk.bas b/Miscellaneous/Automated school clock/v1/kk.bas
new file mode 100755
index 0000000..14883f8
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/kk.bas	
@@ -0,0 +1,699 @@
+' Program allows scheduling school clock ringing.
+' Timetables are stored in separate files.
+' Also it drives numerical 2 digit led display through parallel LPT printer port.
+' Program is driven by special 3 button keyboard that is also attached to LPT port.
+
+DECLARE SUB num (a%)
+DECLARE SUB mntime ()
+DECLARE SUB showit ()
+DECLARE SUB ekrf (a%)
+DECLARE SUB ekr ()
+DECLARE SUB rese ()
+DECLARE SUB start ()
+DECLARE SUB boot ()
+DECLARE SUB getnad (g%, n%, d%, k%)
+DECLARE SUB initp (b$)
+DECLARE SUB getmd (a$, m, d)
+DECLARE SUB son (a$)
+DEFINT A-Z
+
+DECLARE SUB inita ()
+DECLARE SUB chm ()
+DECLARE SUB chd ()
+DECLARE SUB kell (a%)
+DECLARE SUB sync2 ()
+DECLARE SUB sync ()
+DECLARE SUB mnmain ()
+DECLARE SUB main ()
+DECLARE SUB getkey (kla%)
+DECLARE SUB klnait (k%)
+DECLARE SUB heli (a%)
+DECLARE SUB keys ()
+DECLARE SUB disp ()
+DIM SHARED bit(0 TO 7)
+DIM SHARED kl
+DIM SHARED hist(1 TO 3)
+DIM SHARED ap$(1 TO 500)
+DIM SHARED apl
+DIM SHARED pp$(1 TO 500)
+DIM SHARED ppl
+DIM SHARED prt, prt2
+DIM SHARED timo$
+DIM SHARED dato$
+DIM SHARED sona$(1 TO 50)
+DIM SHARED mitus
+DIM SHARED lp$
+DIM SHARED ndlp
+DIM SHARED pn$(1 TO 7)
+DIM SHARED bitt(1 TO 16)
+DIM SHARED modee, vilgu
+DIM SHARED tul(1 TO 2)
+
+start
+heli 4
+
+disp
+mnmain
+
+SUB chd
+b$ = "tuhi"
+IF apl = 0 THEN inita
+
+a$ = DATE$
+n1 = VAL(RIGHT$(a$, 4))
+n2 = VAL(LEFT$(a$, 2))
+a$ = LEFT$(a$, 5)
+n3 = VAL(RIGHT$(a$, 2))
+getnad n1, n2, n3, ndlp
+LOCATE 10, 1
+PRINT "Week plan:", pn$(ndlp)
+FOR a = 1 TO apl
+son ap$(a)
+SELECT CASE sona$(1)
+CASE "v"
+getmd sona$(2), m1, d1
+getmd sona$(3), m2, d2
+getmd DATE$, m3, d3
+IF m3 < m1 THEN GOTO 9
+IF m3 > m2 THEN GOTO 9
+IF m3 = m1 THEN IF d3 < d1 THEN GOTO 9
+IF m3 = m2 THEN IF d3 > d2 THEN GOTO 9
+b$ = sona$(4)
+CASE "n"
+getmd sona$(2), m1, d1
+getmd sona$(3), m2, d2
+getmd DATE$, m3, d3
+IF m3 < m1 THEN GOTO 9
+IF m3 > m2 THEN GOTO 9
+IF m3 = m1 THEN IF d3 < d1 THEN GOTO 9
+IF m3 = m2 THEN IF d3 > d2 THEN GOTO 9
+IF ndlp <> VAL(sona$(4)) THEN GOTO 9
+b$ = sona$(5)
+CASE "e"
+getmd sona$(2), m1, d1
+getmd DATE$, m2, d2
+IF (m1 = m2) AND (d1 = d2) THEN b$ = sona$(3)
+END SELECT
+9
+NEXT a
+
+IF b$ <> lp$ THEN initp b$
+lp$ = b$
+LOCATE 9, 1
+PRINT "Day plan:", lp$
+END SUB
+
+SUB chm
+showit
+a$ = DATE$
+IF a$ <> dato$ THEN chd
+dato$ = a$
+b = 0
+FOR a = 1 TO ppl
+son pp$(a)
+SELECT CASE sona$(1)
+CASE "#"
+getmd sona$(2), h1, m1
+getmd TIME$, h2, m2
+' PRINT h1, m1, h2, m2
+IF (h2 = h1) AND (m2 = m1) THEN
+IF sona$(3) = "sis" THEN b = 1
+IF sona$(3) = "val" THEN b = 2
+END IF
+END SELECT
+NEXT a
+
+IF b > 0 THEN kell b
+
+END SUB
+
+SUB disp
+CLS
+PRINT "Kooli Kell  v 1.2  2002.10.10"
+PRINT "Programmi autor Svjatoslav Agejenko"
+
+END SUB
+
+SUB ekr
+FOR e = 1 TO 10
+c = 1
+c = c + 16 * bitt(1)
+c = c + 32 * bitt(2)
+c = c + 64 * bitt(3)
+c = c + 128 * bitt(4)
+OUT prt2, c
+
+c = 2
+c = c + 16 * bitt(5)
+c = c + 32 * bitt(6)
+c = c + 64 * bitt(7)
+c = c + 128 * bitt(8)
+OUT prt2, c
+
+c = 4
+c = c + 16 * bitt(9)
+c = c + 32 * bitt(10)
+c = c + 64 * bitt(11)
+c = c + 128 * bitt(12)
+OUT prt2, c
+
+c = 8
+c = c + 16 * bitt(13)
+c = c + 32 * bitt(14)
+c = c + 64 * bitt(15)
+c = c + 128 * bitt(16)
+OUT prt2, c
+
+NEXT e
+END SUB
+
+SUB ekrf (a)
+SELECT CASE (a)
+CASE 0
+bitt(1) = 0
+bitt(2) = 0
+bitt(3) = 0
+bitt(7) = 0
+bitt(5) = 0
+bitt(6) = 0
+bitt(8) = 1
+CASE 1
+bitt(2) = 0
+bitt(7) = 0
+CASE 2
+bitt(1) = 0
+bitt(3) = 0
+bitt(5) = 0
+bitt(7) = 0
+bitt(8) = 0
+CASE 3
+bitt(1) = 0
+bitt(2) = 0
+bitt(5) = 0
+bitt(8) = 0
+bitt(7) = 0
+CASE 4
+bitt(2) = 0
+bitt(6) = 0
+bitt(7) = 0
+bitt(8) = 0
+CASE 5
+bitt(1) = 0
+bitt(2) = 0
+bitt(5) = 0
+bitt(6) = 0
+bitt(8) = 0
+CASE 6
+bitt(1) = 0
+bitt(2) = 0
+bitt(3) = 0
+bitt(5) = 0
+bitt(6) = 0
+bitt(8) = 0
+CASE 7
+bitt(2) = 0
+bitt(7) = 0
+bitt(5) = 0
+CASE 8
+bitt(1) = 0
+bitt(2) = 0
+bitt(3) = 0
+bitt(7) = 0
+bitt(5) = 0
+bitt(6) = 0
+bitt(8) = 0
+CASE 9
+bitt(1) = 0
+bitt(2) = 0
+bitt(7) = 0
+bitt(5) = 0
+bitt(6) = 0
+bitt(8) = 0
+CASE 10
+bitt(15) = 0
+bitt(16) = 0
+bitt(12) = 0
+bitt(10) = 0
+bitt(9) = 0
+bitt(4) = 0
+CASE 11
+bitt(15) = 0
+bitt(4) = 0
+CASE 12
+bitt(15) = 0
+bitt(16) = 0
+bitt(9) = 0
+bitt(10) = 0
+bitt(11) = 0
+CASE 13
+bitt(15) = 0
+bitt(4) = 0
+bitt(16) = 0
+bitt(11) = 0
+bitt(9) = 0
+CASE 14
+bitt(15) = 0
+bitt(4) = 0
+bitt(12) = 0
+bitt(11) = 0
+CASE 15
+bitt(9) = 0
+bitt(4) = 0
+bitt(11) = 0
+bitt(12) = 0
+bitt(16) = 0
+CASE 16
+bitt(9) = 0
+bitt(4) = 0
+bitt(11) = 0
+bitt(12) = 0
+bitt(16) = 0
+bitt(10) = 0
+CASE 17
+bitt(4) = 0
+bitt(15) = 0
+bitt(16) = 0
+CASE 18
+bitt(4) = 0
+bitt(15) = 0
+bitt(16) = 0
+bitt(12) = 0
+bitt(11) = 0
+bitt(10) = 0
+bitt(9) = 0
+CASE 19
+bitt(4) = 0
+bitt(15) = 0
+bitt(16) = 0
+bitt(12) = 0
+bitt(11) = 0
+bitt(9) = 0
+END SELECT
+
+END SUB
+
+SUB getkey (kla)
+
+' Read the state of the buttons on the keyboard
+1
+IF vilgu = 1 THEN
+tmr = tmr + 1
+IF tmr > 5 THEN bitt(13) = tul(1): bitt(14) = tul(2) ELSE bitt(13) = 1: bitt(14) = 1
+IF tmr > 10 THEN
+tmr = 0
+END IF
+ELSE
+bitt(13) = tul(1)
+bitt(14) = tul(2)
+END IF
+
+' Get the current time
+b$ = LEFT$(TIME$, 5)
+IF b$ <> timo$ THEN chm
+timo$ = b$
+hist(1) = hist(1) + 1
+IF hist(1) > 20000 THEN hist(1) = 15000
+hist(2) = hist(2) + 1
+IF hist(2) > 20000 THEN hist(2) = 15000
+hist(3) = hist(3) + 1
+IF hist(3) > 20000 THEN hist(3) = 15000
+
+' Read the state of the buttons on the keyboard
+keys
+IF kl > 0 THEN
+  IF hist(kl) > 1 AND hist(kl) < 9 THEN
+    klnait kl + 3
+    kla = kl + 3
+    GOTO 4
+  ELSE
+    hist(kl) = 0
+  END IF
+END IF
+IF hist(1) = 10 THEN klnait 1: kla = 1: GOTO 4
+IF hist(2) = 10 THEN klnait 2: kla = 2: GOTO 4
+IF hist(3) = 10 THEN klnait 3: kla = 3: GOTO 4
+
+IF hist(1) > 11 AND hist(2) > 11 AND hist(3) > 11 THEN klnait 0
+
+' Display current time and date
+LOCATE 7, 1
+PRINT TIME$
+LOCATE 8, 1
+PRINT DATE$
+GOTO 1
+4
+
+' Reset the button press count
+hist(1) = 10000
+hist(2) = 10000
+hist(3) = 10000
+
+' Play a sound to indicate button press
+FOR b = 1 TO 100
+SOUND 0, .1
+NEXT b
+IF kla > 3 THEN SOUND 4000, .1 ELSE SOUND 3000, .1
+
+END SUB
+
+SUB getmd (a$, m, d)
+b$ = LEFT$(a$, 5)
+m = VAL(LEFT$(b$, 2))
+d = VAL(RIGHT$(b$, 2))
+
+END SUB
+
+SUB getnad (g, n, d, k)
+LOCATE 11, 1
+PRINT g, n, d
+p = g
+m = n - 2
+IF n > 2 GOTO 120
+p = p - 1: m = m + 12
+120
+c = INT(p / 100)
+y = p - c * 100
+w = d + INT((13 * m - 1) / 5) + y + INT(y / 4) + INT(c / 4) - 2 * c
+k = w - 7 * INT(w / 7)
+IF k = 0 THEN k = 7
+END SUB
+
+SUB heli (a)
+'GOTO 10
+SELECT CASE a
+CASE 1
+FOR c = 1 TO 5
+SOUND 3000, 1
+SOUND 0, 1
+NEXT c
+
+CASE 2
+FOR c = 1 TO 5
+SOUND 2500, 1
+SOUND 0, 2
+NEXT c
+SOUND 2500, 10
+
+CASE 3
+FOR a = 1 TO 10
+SOUND 500, .5
+SOUND 1500, .5
+SOUND 2000, .5
+SOUND 1520, .5
+NEXT a
+
+CASE 4
+FOR a = 800 TO 1000 STEP 10
+SOUND a, .1
+SOUND a * 3, .1
+SOUND 0, 1
+NEXT a
+10
+
+END SELECT
+
+END SUB
+
+SUB inita
+apl = 0
+OPEN "aasta.ap" FOR INPUT AS #1
+5
+IF EOF(1) <> 0 THEN GOTO 3
+LINE INPUT #1, a$
+apl = apl + 1
+ap$(apl) = a$
+GOTO 5
+3
+CLOSE #1
+END SUB
+
+SUB initp (b$)
+ppl = 0
+OPEN b$ + ".pp" FOR INPUT AS #1
+6
+IF EOF(1) <> 0 THEN GOTO 7
+LINE INPUT #1, a$
+ppl = ppl + 1
+pp$(ppl) = a$
+GOTO 6
+7
+CLOSE #1
+END SUB
+
+SUB kell (a)
+heli 3
+
+SELECT CASE a
+CASE 1
+OUT prt, 255
+FOR b = 1 TO 80
+SOUND 0, 1
+NEXT b
+OUT prt, 0
+FOR b = 1 TO 15
+SOUND 0, 1
+NEXT b
+OUT prt, 255
+FOR b = 1 TO 15
+SOUND 0, 1
+NEXT b
+OUT prt, 0
+
+CASE 2
+OUT prt, 255
+FOR b = 1 TO 80
+SOUND 0, 1
+NEXT b
+OUT prt, 0
+
+END SELECT
+END SUB
+
+SUB keys
+kl = 0
+OUT prt, 0
+8
+a = INP(prt)
+b = INP(prt)
+IF a <> b THEN GOTO 8
+
+b = 128
+FOR c = 0 TO 7
+d = INT(a / b)
+bit(c) = d
+a = a - (b * d)
+b = b / 2
+NEXT c
+
+IF bit(4) = 1 AND bit(6) = 1 THEN bit(4) = 0: bit(6) = 0: kl = 3
+IF bit(6) = 1 THEN kl = 2
+IF bit(4) = 1 THEN kl = 1
+
+a$ = INKEY$
+IF a$ = CHR$(0) + "K" THEN kl = 1
+IF a$ = CHR$(0) + "M" THEN kl = 2
+IF a$ = CHR$(0) + "P" THEN kl = 3
+ekr
+END SUB
+
+SUB klnait (k)
+
+' Highlight the pressed button on the display
+IF k = 3 THEN c = 3 ELSE c = 1
+IF k = 6 THEN c = 14
+LOCATE 5, 6
+COLOR 7, c
+PRINT "<kesk>"
+COLOR 7, 0
+
+' Highlight the pressed button on the display
+IF k = 1 THEN c = 3 ELSE c = 1
+IF k = 4 THEN c = 14
+LOCATE 4, 1
+COLOR 7, c
+PRINT "<vasak>"
+COLOR 7, 0
+
+IF k = 2 THEN c = 3 ELSE c = 1
+IF k = 5 THEN c = 14
+LOCATE 4, 10
+COLOR 7, c
+PRINT "<parem>"
+COLOR 7, 0
+
+END SUB
+
+SUB mnmain
+2
+getkey a
+IF a = 6 THEN sync
+IF a = 3 THEN sync2
+
+IF a = 1 THEN kell 1
+IF a = 4 THEN kell 2
+
+IF a = 2 THEN mntime
+IF a = 5 THEN rese
+GOTO 2
+
+END SUB
+
+SUB mntime
+vilgu = 1
+11
+showit
+getkey a
+
+IF modee = 1 THEN
+  b = VAL(LEFT$(TIME$, 2))
+  c = 0
+  IF a = 1 THEN c = 1: b = b - 1
+  IF a = 2 THEN c = 1: b = b + 1
+  IF b < 0 THEN b = 0
+  IF b > 23 THEN b = 23
+  d$ = STR$(b)
+  IF LEFT$(d$, 1) = " " THEN d$ = RIGHT$(d$, LEN(d$) - 1)
+  IF LEN(d$) < 2 THEN d$ = "0" + d$
+  e$ = d$ + RIGHT$(TIME$, 6)
+  IF c = 1 THEN TIME$ = e$
+ELSE
+  b = VAL(RIGHT$(LEFT$(TIME$, 5), 2))
+  c = 0
+  IF a = 1 THEN c = 1: b = b - 1
+  IF a = 2 THEN c = 1: b = b + 1
+  IF b < 0 THEN b = 0
+  IF b > 59 THEN b = 59
+  d$ = STR$(b)
+  IF LEFT$(d$, 1) = " " THEN d$ = RIGHT$(d$, LEN(d$) - 1)
+  IF LEN(d$) < 2 THEN d$ = "0" + d$
+  e$ = LEFT$(TIME$, 3) + d$ + RIGHT$(TIME$, 3)
+  IF c = 1 THEN TIME$ = e$
+END IF
+
+IF a = 3 THEN
+IF modee = 1 THEN modee = 2 ELSE modee = 1
+END IF
+
+IF a = 6 THEN GOTO 12
+GOTO 11
+12
+vilgu = 0
+modee = 2
+END SUB
+
+SUB num (a)
+
+FOR b = 1 TO 12
+bitt(b) = 1
+NEXT b
+bitt(15) = 1
+bitt(16) = 1
+
+b = INT(a / 10)
+c = a - (10 * b)
+ekrf b
+ekrf c + 10
+END SUB
+
+SUB rese
+heli 4
+timo$ = ""
+dato$ = ""
+apl = 0
+END SUB
+
+SUB showit
+a$ = LEFT$(TIME$, 5)
+IF modee = 1 THEN
+b = VAL(LEFT$(a$, 2))
+tul(1) = 1
+tul(2) = 0
+ELSE
+b = VAL(RIGHT$(a$, 2))
+tul(1) = 0
+tul(2) = 1
+END IF
+LOCATE 15, 1
+PRINT b
+num b
+
+
+END SUB
+
+SUB son (a$)
+
+FOR b = 1 TO 50
+sona$(b) = ""
+NEXT b
+mitus = 0
+
+b = 1
+FOR c = 1 TO LEN(a$)
+d$ = RIGHT$(LEFT$(a$, c), 1)
+IF d$ = " " OR d$ = CHR$(9) THEN
+b = 1
+ELSE
+IF b = 1 THEN b = 0: mitus = mitus + 1
+sona$(mitus) = sona$(mitus) + d$
+END IF
+NEXT c
+
+
+END SUB
+
+SUB start
+pn$(1) = "Monday"
+pn$(2) = "Tuesday"
+pn$(3) = "Wednesday"
+pn$(4) = "Thursday"
+pn$(5) = "Friday"
+pn$(6) = "Saturday"
+pn$(7) = "Sunday"
+
+prt = &H37A
+prt2 = &H378
+hist(1) = 10000
+hist(2) = 10000
+hist(3) = 10000
+
+FOR a = 1 TO 16
+bitt(a) = 1
+NEXT a
+modee = 2
+vilgu = 0
+tul(1) = 1
+tul(2) = 1
+END SUB
+
+SUB sync
+OPEN "sync.txt" FOR INPUT AS #1
+LINE INPUT #1, a$
+DATE$ = a$
+LINE INPUT #1, a$
+TIME$ = a$
+CLOSE #1
+
+heli 2
+END SUB
+
+SUB sync2
+a$ = TIME$
+a$ = LEFT$(a$, 5)
+b = VAL(RIGHT$(a$, 2))
+c = VAL(LEFT$(a$, 2))
+IF b >= 30 THEN c = c + 1
+b = 0
+IF c > 23 THEN c = c - 24
+a$ = RIGHT$(STR$(c), LEN(STR$(c)) - 1)
+b$ = RIGHT$(STR$(b), LEN(STR$(b)) - 1)
+IF LEN(a$) < 2 THEN a$ = "0" + a$
+IF LEN(b$) < 2 THEN b$ = "0" + b$
+a$ = a$ + ":" + b$
+
+'LOCATE 10, 1
+'PRINT a$
+
+TIME$ = a$
+
+heli 1
+END SUB
diff --git a/Miscellaneous/Automated school clock/v1/opetajap.pp b/Miscellaneous/Automated school clock/v1/opetajap.pp
new file mode 100644
index 0000000..0708469
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/opetajap.pp	
@@ -0,0 +1,19 @@
+# 08:30 sis
+# 09:15 val
+
+# 09:25 sis
+# 10:10 val
+
+# 10:20 sis
+# 10:45 val
+
+# 10:55 sis
+# 11:20 val
+
+# 11:40 sis
+# 12:05 val
+
+# 12:15 sis
+# 12:40 val
+
+
diff --git a/Miscellaneous/Automated school clock/v1/rebased.pp b/Miscellaneous/Automated school clock/v1/rebased.pp
new file mode 100644
index 0000000..97dc6a5
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/rebased.pp	
@@ -0,0 +1,23 @@
+# 08:30 sis
+# 09:10 val
+
+# 09:20 sis
+# 10:00 val
+
+# 10:10 sis
+# 10:50 val
+
+# 11:30 sis
+# 12:10 val
+
+# 12:20 sis
+# 13:00 val
+
+# 13:10 sis
+# 13:50 val
+
+# 14:00 sis
+# 14:40 val
+
+# 14:45 sis
+# 15:30 val
diff --git a/Miscellaneous/Automated school clock/v1/reede.pp b/Miscellaneous/Automated school clock/v1/reede.pp
new file mode 100644
index 0000000..b4c0e82
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/reede.pp	
@@ -0,0 +1,23 @@
+# 08:30 sis
+# 09:15 val
+
+# 09:25 sis
+# 10:10 val
+
+# 10:20 sis
+# 11:05 val
+
+# 11:35 sis
+# 12:20 val
+
+# 12:30 sis
+# 13:15 val
+
+# 13:20 sis
+# 14:05 val
+
+# 14:10 sis
+# 14:55 val
+
+# 15:00 sis
+# 15:45 val
diff --git a/Miscellaneous/Automated school clock/v1/sync.txt b/Miscellaneous/Automated school clock/v1/sync.txt
new file mode 100644
index 0000000..f6ff243
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/sync.txt	
@@ -0,0 +1,5 @@
+09-06-2002
+15:38
+
+kuu-paev-aasta
+tunnid-minutid
\ No newline at end of file
diff --git a/Miscellaneous/Automated school clock/v1/tava.pp b/Miscellaneous/Automated school clock/v1/tava.pp
new file mode 100644
index 0000000..ce22071
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v1/tava.pp	
@@ -0,0 +1,36 @@
+# 08:30 sis
+# 09:15 val
+
+# 09:25 sis
+# 10:10 val
+
+# 10:20 sis
+# 11:05 val
+
+# 11:35 sis
+# 12:20 val
+
+# 12:30 sis
+# 13:15 val
+
+# 13:25 sis
+# 14:10 val
+
+# 14:20 sis
+# 15:05 val
+
+# 15:10 sis
+# 15:55 val
+
+# 16:00 sis
+# 16:45 val
+
+# 16:50 sis
+# 17:45 val
+
+# 17:50 sis
+# 18:25 val
+
+# 18:30 sis
+# 19:15 val
+
diff --git a/Miscellaneous/Automated school clock/v1/tuhi.pp b/Miscellaneous/Automated school clock/v1/tuhi.pp
new file mode 100644
index 0000000..e69de29
diff --git a/Miscellaneous/Automated school clock/v2/aasta.ap b/Miscellaneous/Automated school clock/v2/aasta.ap
new file mode 100644
index 0000000..82777d6
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v2/aasta.ap	
@@ -0,0 +1,14 @@
+v	01-01 	12-31	tava
+n	01-01	12-31	5	reede
+e	10-04	opetajap
+e	10-31	rebased
+e	04-17	luhend
+e	04-18	tuhi
+e	04-30	luhend
+e	05-01	tuhi
+e	06-23	tuhi
+e	06-24	tuhi
+n	01-01	12-31	6	tuhi
+n	01-01	12-31	7	tuhi
+v	07-01	08-31	tuhi
+
diff --git a/Miscellaneous/Automated school clock/v2/kkmini.bas b/Miscellaneous/Automated school clock/v2/kkmini.bas
new file mode 100755
index 0000000..4564dc8
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v2/kkmini.bas	
@@ -0,0 +1,485 @@
+DECLARE SUB dispt ()
+' Svjatoslav Agejenko
+' E-mail: svjatoslav@svjatoslav.eu
+' Homepage: www.hot.ee/n0/
+
+DECLARE SUB dispp ()
+DECLARE SUB displukk ()
+DECLARE SUB kola (a%)
+DECLARE SUB rese ()
+DECLARE SUB start ()
+DECLARE SUB getnad (g%, n%, d%, k%)
+DECLARE SUB initp (b$)
+DECLARE SUB getmd (a$, m%, d%)
+DECLARE SUB son (a$)
+DECLARE SUB inita ()
+DECLARE SUB chm ()
+DECLARE SUB chd ()
+DECLARE SUB kell (a%)
+DECLARE SUB sync2 ()
+DECLARE SUB sync ()
+DECLARE SUB mnmain ()
+DECLARE SUB heli (a%)
+DECLARE SUB disp ()
+DEFINT A-Z
+
+DIM SHARED ap$(1 TO 500)
+DIM SHARED apl
+DIM SHARED pp$(1 TO 500)
+DIM SHARED ppl
+DIM SHARED prt, prt2
+DIM SHARED timo$
+DIM SHARED dato$
+DIM SHARED sona$(1 TO 50)
+DIM SHARED mitus
+DIM SHARED lp$
+DIM SHARED ndlp
+DIM SHARED pn$(1 TO 7)
+DIM SHARED lk$
+DIM SHARED ssave
+DIM SHARED ssavel
+DIM SHARED timero AS LONG
+DIM SHARED kblukk
+DIM SHARED tunnidara
+
+start
+
+
+disp
+mnmain
+
+SUB chd
+b$ = "tuhi"
+IF apl = 0 THEN inita
+
+a$ = DATE$
+n1 = VAL(RIGHT$(a$, 4))
+n2 = VAL(LEFT$(a$, 2))
+a$ = LEFT$(a$, 5)
+n3 = VAL(RIGHT$(a$, 2))
+getnad n1, n2, n3, ndlp
+FOR a = 1 TO apl
+son ap$(a)
+SELECT CASE sona$(1)
+CASE "v"
+getmd sona$(2), m1, d1
+getmd sona$(3), m2, d2
+getmd DATE$, m3, d3
+IF m3 < m1 THEN GOTO 9
+IF m3 > m2 THEN GOTO 9
+IF m3 = m1 THEN IF d3 < d1 THEN GOTO 9
+IF m3 = m2 THEN IF d3 > d2 THEN GOTO 9
+b$ = sona$(4)
+CASE "n"
+getmd sona$(2), m1, d1
+getmd sona$(3), m2, d2
+getmd DATE$, m3, d3
+IF m3 < m1 THEN GOTO 9
+IF m3 > m2 THEN GOTO 9
+IF m3 = m1 THEN IF d3 < d1 THEN GOTO 9
+IF m3 = m2 THEN IF d3 > d2 THEN GOTO 9
+IF ndlp <> VAL(sona$(4)) THEN GOTO 9
+b$ = sona$(5)
+CASE "e"
+getmd sona$(2), m1, d1
+getmd DATE$, m2, d2
+IF (m1 = m2) AND (d1 = d2) THEN b$ = sona$(3)
+END SELECT
+9
+NEXT a
+
+IF b$ <> lp$ THEN initp b$
+lp$ = b$
+tunnidara = 0
+dispp
+disp
+END SUB
+
+SUB chm
+a$ = DATE$
+IF a$ <> dato$ THEN chd
+dato$ = a$
+b = 0
+FOR a = 1 TO ppl
+son pp$(a)
+SELECT CASE sona$(1)
+CASE "#"
+getmd sona$(2), h1, m1
+getmd TIME$, h2, m2
+' PRINT h1, m1, h2, m2
+IF (h2 = h1) AND (m2 = m1) THEN
+IF sona$(3) = "sis" THEN b = 1
+IF sona$(3) = "val" THEN b = 2
+END IF
+END SELECT
+NEXT a
+
+IF (tunnidara = 0) AND (b > 0) THEN kell b
+ssave = ssave + 1
+END SUB
+
+SUB disp
+CLS
+PRINT "Kooli Kell (mini) v 1.1  2003.3"
+PRINT "Programmi autor Svjatoslav Agejenko   E-mail: n0@hot.ee"
+PRINT ""
+PRINT "s - kell tundi sisse             v - kell tunnist v�lja"
+PRINT "a - sisesta uus aeg              d - sisesta uus daatum"
+PRINT "u - �mardab aja t�istunnini      l - laeb aja failist SYNC.TXT"
+PRINT "7 - 1 minut tagasi               8 - 1 minut edasi"
+PRINT "4 - 1 tund tagasi                5 - 1 tund edasi"
+PRINT "r - programmi restart            q - programmist v�lja"
+PRINT "                                 j - j�tab k�ik tunnid t�na �ra"
+
+dispp
+
+LOCATE 12, 15
+PRINT "Kuu-P�ev-Aasta (USA standard)"
+
+
+LOCATE 17
+
+FOR a = 1 TO ppl
+IF pp$(a) <> SPACE$(LEN(pp$(a))) THEN
+  PRINT pp$(a);
+  PRINT SPACE$(15 - LEN(pp$(a)));
+END IF
+NEXT a
+
+displukk
+dispt
+END SUB
+
+SUB displukk
+LOCATE 1, 40
+IF kblukk = 1 THEN
+  COLOR 0, 7
+  PRINT "Klaviatuur lukus! Vajuta CTRL+L"
+  COLOR 7, 0
+ELSE
+  PRINT "                               "
+END IF
+END SUB
+
+SUB dispp
+IF ndlp = 0 THEN GOTO 14
+LOCATE 14, 1
+PRINT "n�dalap�ev:", pn$(ndlp)
+LOCATE 15, 1
+PRINT "p�evaplaan:", lp$
+14
+END SUB
+
+SUB dispt
+LOCATE 16, 20
+COLOR 12 + 15, 0
+IF tunnidara = 1 THEN
+  PRINT "T�na on k�ik tunnid �ra j�etud"
+ELSE
+  PRINT "                              "
+END IF
+COLOR 7, 0
+END SUB
+
+SUB getmd (a$, m, d)
+b$ = LEFT$(a$, 5)
+m = VAL(LEFT$(b$, 2))
+d = VAL(RIGHT$(b$, 2))
+
+END SUB
+
+SUB getnad (g, n, d, k)
+'LOCATE 11, 1
+'PRINT g, n, d
+p = g
+m = n - 2
+IF n > 2 GOTO 120
+p = p - 1: m = m + 12
+120
+c = INT(p / 100)
+y = p - c * 100
+w = d + INT((13 * m - 1) / 5) + y + INT(y / 4) + INT(c / 4) - 2 * c
+k = w - 7 * INT(w / 7)
+IF k = 0 THEN k = 7
+END SUB
+
+SUB heli (a)
+'GOTO 10
+SELECT CASE a
+CASE 1
+FOR c = 1 TO 5
+SOUND 3000, 1
+SOUND 0, 1
+NEXT c
+
+CASE 2
+FOR c = 1 TO 5
+SOUND 2500, 1
+SOUND 0, 2
+NEXT c
+SOUND 2500, 10
+
+CASE 3
+FOR a = 1 TO 10
+SOUND 500, .5
+SOUND 1500, .5
+SOUND 2000, .5
+SOUND 1520, .5
+NEXT a
+
+
+CASE 4
+FOR a = 800 TO 1000 STEP 10
+SOUND a, .1
+SOUND a * 3, .1
+SOUND 0, 1
+NEXT a
+10
+
+END SELECT
+
+
+END SUB
+
+SUB inita
+apl = 0
+OPEN "aasta.ap" FOR INPUT AS #1
+5
+IF EOF(1) <> 0 THEN GOTO 3
+LINE INPUT #1, a$
+apl = apl + 1
+ap$(apl) = a$
+GOTO 5
+3
+CLOSE #1
+END SUB
+
+SUB initp (b$)
+ppl = 0
+OPEN b$ + ".pp" FOR INPUT AS #1
+6
+IF EOF(1) <> 0 THEN GOTO 7
+LINE INPUT #1, a$
+ppl = ppl + 1
+pp$(ppl) = a$
+GOTO 6
+7
+CLOSE #1
+END SUB
+
+SUB kell (a)
+b$ = TIME$ + DATE$
+IF b$ <> lk$ THEN lk$ = b$ ELSE GOTO 2
+
+heli 3
+
+SELECT CASE a
+CASE 1
+kola 4
+FOR b = 1 TO 15
+SOUND 0, 1
+NEXT b
+kola 1
+CASE 2
+kola 5
+END SELECT
+2
+END SUB
+
+SUB kola (a)
+timero = TIMER
+11
+FOR b = 1 TO 100
+OUT prt, 0
+OUT prt, 255
+NEXT b
+IF ABS(timero - TIMER) < a THEN GOTO 11
+END SUB
+
+SUB mnmain
+1
+b$ = LEFT$(TIME$, 5)
+IF b$ <> timo$ THEN chm
+timo$ = b$
+
+a$ = INKEY$
+
+IF a$ <> "" THEN
+IF ssave > ssavel THEN disp
+ssave = 0
+END IF
+
+IF a$ = CHR$(12) THEN
+  IF kblukk = 1 THEN kblukk = 0 ELSE kblukk = 1
+  displukk
+END IF
+IF kblukk = 1 THEN a$ = ""
+
+IF a$ = "s" THEN kell 1
+IF a$ = "v" THEN kell 2
+
+IF a$ = "a" THEN
+CLS
+PRINT "                  vana aeg: " + TIME$
+INPUT "sisesta uus aeg (TT:MM:SS): ", b$
+IF LEN(b$) <> 8 THEN GOTO 12
+TIME$ = b$
+timo$ = ""
+12
+disp
+END IF
+
+IF a$ = "d" THEN
+CLS
+PRINT "                    vana daatum: " + DATE$
+INPUT "sisesta uus daatum (KK-PP-AAAA): ", b$
+IF LEN(b$) <> 10 THEN GOTO 13
+DATE$ = b$
+timo$ = ""
+13
+disp
+END IF
+
+IF a$ = "7" OR a$ = "8" THEN
+  b = VAL(RIGHT$(LEFT$(TIME$, 5), 2))
+  IF a$ = "7" THEN b = b - 1
+  IF a$ = "8" THEN b = b + 1
+  IF b < 0 THEN b = 0
+  IF b > 59 THEN b = 59
+  d$ = STR$(b)
+  IF LEFT$(d$, 1) = " " THEN d$ = RIGHT$(d$, LEN(d$) - 1)
+  IF LEN(d$) < 2 THEN d$ = "0" + d$
+  e$ = LEFT$(TIME$, 3) + d$ + RIGHT$(TIME$, 3)
+  TIME$ = e$
+END IF
+
+IF a$ = "4" OR a$ = "5" THEN
+  b = VAL(LEFT$(TIME$, 2))
+  IF a$ = "4" THEN b = b - 1
+  IF a$ = "5" THEN b = b + 1
+  IF b < 0 THEN b = 0
+  IF b > 23 THEN b = 23
+  d$ = STR$(b)
+  IF LEFT$(d$, 1) = " " THEN d$ = RIGHT$(d$, LEN(d$) - 1)
+  IF LEN(d$) < 2 THEN d$ = "0" + d$
+  e$ = d$ + RIGHT$(TIME$, 6)
+  TIME$ = e$
+END IF
+
+IF a$ = "u" THEN sync2
+IF a$ = "l" THEN sync
+
+IF a$ = "r" THEN rese
+IF a$ = "q" THEN SYSTEM
+
+IF a$ = "j" THEN
+IF tunnidara = 0 THEN tunnidara = 1 ELSE tunnidara = 0
+dispt
+END IF
+
+IF ssave <= ssavel THEN
+  LOCATE 11, 1
+  PRINT TIME$
+  LOCATE 12, 1
+  PRINT DATE$
+ELSE
+  IF ABS(TIMER - timero) > 10 THEN
+  CLS
+  kblukk = 1
+  FOR b = 1 TO 20
+    LOCATE RND * 22 + 1, RND * 79 + 1
+    IF RND * 100 < 50 THEN PRINT "*" ELSE PRINT "."
+  NEXT b
+  LOCATE RND * 22 + 1, RND * 50 + 1
+  COLOR 0, 7
+  PRINT "< " + LEFT$(TIME$, 2);
+  COLOR 16, 7
+  PRINT ":";
+  COLOR 0, 7
+  PRINT RIGHT$(LEFT$(TIME$, 5), 2) + " >"
+  COLOR 7, 0
+  timero = TIMER
+  END IF
+END IF
+GOTO 1
+
+
+END SUB
+
+SUB rese
+heli 4
+timo$ = ""
+dato$ = ""
+apl = 0
+END SUB
+
+SUB son (a$)
+
+FOR b = 1 TO 50
+sona$(b) = ""
+NEXT b
+mitus = 0
+
+b = 1
+FOR c = 1 TO LEN(a$)
+d$ = RIGHT$(LEFT$(a$, c), 1)
+IF d$ = " " OR d$ = CHR$(9) THEN
+b = 1
+ELSE
+IF b = 1 THEN b = 0: mitus = mitus + 1
+sona$(mitus) = sona$(mitus) + d$
+END IF
+NEXT c
+
+
+END SUB
+
+SUB start
+pn$(1) = "esmasp�ev"
+pn$(2) = "teisip�ev"
+pn$(3) = "kolmap�ev"
+pn$(4) = "neljap�ev"
+pn$(5) = "reede"
+pn$(6) = "laup�ev"
+pn$(7) = "p�hap�ev"
+
+prt = &H378
+
+ssavel = 2
+kblukk = 1
+tunnidara = 0
+END SUB
+
+SUB sync
+OPEN "sync.txt" FOR INPUT AS #1
+LINE INPUT #1, a$
+DATE$ = a$
+LINE INPUT #1, a$
+TIME$ = a$
+CLOSE #1
+
+heli 2
+END SUB
+
+SUB sync2
+a$ = TIME$
+a$ = LEFT$(a$, 5)
+b = VAL(RIGHT$(a$, 2))
+c = VAL(LEFT$(a$, 2))
+IF b >= 30 THEN c = c + 1
+b = 0
+IF c > 23 THEN c = c - 24
+a$ = RIGHT$(STR$(c), LEN(STR$(c)) - 1)
+b$ = RIGHT$(STR$(b), LEN(STR$(b)) - 1)
+IF LEN(a$) < 2 THEN a$ = "0" + a$
+IF LEN(b$) < 2 THEN b$ = "0" + b$
+a$ = a$ + ":" + b$
+
+'LOCATE 10, 1
+'PRINT a$
+
+TIME$ = a$
+
+heli 1
+END SUB
+
diff --git a/Miscellaneous/Automated school clock/v2/luhend.pp b/Miscellaneous/Automated school clock/v2/luhend.pp
new file mode 100644
index 0000000..8c36fd4
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v2/luhend.pp	
@@ -0,0 +1,27 @@
+# 08:30 sis
+# 09:00 val
+
+# 09:10 sis
+# 09:40 val
+
+# 09:50 sis
+# 10:20 val
+
+# 10:30 sis
+# 11:00 val
+
+# 11:30 sis
+# 12:00 val
+
+# 12:10 sis
+# 12:40 val
+
+# 12:50 sis
+# 13:20 val
+
+# 13:30 sis
+# 14:00 val
+
+# 14:05 sis
+# 14:35 val
+
diff --git a/Miscellaneous/Automated school clock/v2/opetajap.pp b/Miscellaneous/Automated school clock/v2/opetajap.pp
new file mode 100644
index 0000000..0708469
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v2/opetajap.pp	
@@ -0,0 +1,19 @@
+# 08:30 sis
+# 09:15 val
+
+# 09:25 sis
+# 10:10 val
+
+# 10:20 sis
+# 10:45 val
+
+# 10:55 sis
+# 11:20 val
+
+# 11:40 sis
+# 12:05 val
+
+# 12:15 sis
+# 12:40 val
+
+
diff --git a/Miscellaneous/Automated school clock/v2/rebased.pp b/Miscellaneous/Automated school clock/v2/rebased.pp
new file mode 100644
index 0000000..97dc6a5
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v2/rebased.pp	
@@ -0,0 +1,23 @@
+# 08:30 sis
+# 09:10 val
+
+# 09:20 sis
+# 10:00 val
+
+# 10:10 sis
+# 10:50 val
+
+# 11:30 sis
+# 12:10 val
+
+# 12:20 sis
+# 13:00 val
+
+# 13:10 sis
+# 13:50 val
+
+# 14:00 sis
+# 14:40 val
+
+# 14:45 sis
+# 15:30 val
diff --git a/Miscellaneous/Automated school clock/v2/reede.pp b/Miscellaneous/Automated school clock/v2/reede.pp
new file mode 100644
index 0000000..b4c0e82
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v2/reede.pp	
@@ -0,0 +1,23 @@
+# 08:30 sis
+# 09:15 val
+
+# 09:25 sis
+# 10:10 val
+
+# 10:20 sis
+# 11:05 val
+
+# 11:35 sis
+# 12:20 val
+
+# 12:30 sis
+# 13:15 val
+
+# 13:20 sis
+# 14:05 val
+
+# 14:10 sis
+# 14:55 val
+
+# 15:00 sis
+# 15:45 val
diff --git a/Miscellaneous/Automated school clock/v2/sync.txt b/Miscellaneous/Automated school clock/v2/sync.txt
new file mode 100644
index 0000000..dbbc645
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v2/sync.txt	
@@ -0,0 +1,5 @@
+02-03-2003
+11:32
+
+kuu-paev-aasta
+tunnid-minutid
\ No newline at end of file
diff --git a/Miscellaneous/Automated school clock/v2/tava.pp b/Miscellaneous/Automated school clock/v2/tava.pp
new file mode 100644
index 0000000..e83ded7
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v2/tava.pp	
@@ -0,0 +1,29 @@
+# 08:30 sis
+# 09:15 val
+
+# 09:25 sis
+# 10:10 val
+
+# 10:20 sis
+# 11:05 val
+
+# 11:35 sis
+# 12:20 val
+
+# 12:30 sis
+# 13:15 val
+
+# 13:25 sis
+# 14:10 val
+
+# 14:20 sis
+# 15:05 val
+
+# 15:10 sis
+# 15:55 val
+
+# 16:00 sis
+# 16:45 val
+
+# 16:50 sis
+# 17:35 val
\ No newline at end of file
diff --git a/Miscellaneous/Automated school clock/v2/tuhi.pp b/Miscellaneous/Automated school clock/v2/tuhi.pp
new file mode 100644
index 0000000..e69de29
diff --git a/Miscellaneous/Automated school clock/v3/aasta.ap b/Miscellaneous/Automated school clock/v3/aasta.ap
new file mode 100644
index 0000000..8640065
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v3/aasta.ap	
@@ -0,0 +1,12 @@
+v	01-01 	12-31	tava
+n	01-01	12-31	5	reede
+e	04-17	luhend
+e	04-18	tuhi
+e	04-30	luhend
+e	05-01	tuhi
+e	06-23	tuhi
+e	06-24	tuhi
+n	01-01	12-31	6	tuhi
+n	01-01	12-31	7	tuhi
+v	07-01	08-31	tuhi
+
diff --git a/Miscellaneous/Automated school clock/v3/kell3.bas b/Miscellaneous/Automated school clock/v3/kell3.bas
new file mode 100755
index 0000000..459e85a
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v3/kell3.bas	
@@ -0,0 +1,623 @@
+' Program allows scheduling school clock ringing.
+' Timetables are stored in separate files.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' ?, Initial version
+' 2024, Improved program readability
+
+
+DECLARE FUNCTION getName$ (a%)
+DECLARE FUNCTION getSym$ (a$, b%)
+DECLARE SUB editor ()
+DECLARE SUB leiaconf ()
+DECLARE SUB clrerr ()
+DECLARE SUB dispt ()
+
+DECLARE SUB dispp ()
+DECLARE SUB displukk ()
+DECLARE SUB kola (a%)
+DECLARE SUB rese ()
+DECLARE SUB start ()
+DECLARE SUB getNad (g%, n%, d%, k%)
+DECLARE SUB initp (b$)
+DECLARE SUB getMd (a$, m%, d%)
+DECLARE SUB son (a$)
+DECLARE SUB inita ()
+DECLARE SUB chm ()
+DECLARE SUB chd ()
+DECLARE SUB kell (a%)
+DECLARE SUB sync2 ()
+DECLARE SUB sync ()
+DECLARE SUB mnmain ()
+DECLARE SUB heli (a%)
+DECLARE SUB disp ()
+DEFINT A-Z
+
+DIM SHARED ap$(1 TO 500)
+DIM SHARED apl
+DIM SHARED pp$(1 TO 500)
+DIM SHARED ppl
+DIM SHARED prt, prt2
+DIM SHARED timo$
+DIM SHARED dato$
+DIM SHARED sona$(1 TO 50)
+DIM SHARED mitus
+DIM SHARED lp$
+DIM SHARED ndlp
+DIM SHARED pn$(1 TO 7)
+DIM SHARED lk$
+DIM SHARED ssave
+DIM SHARED ssavel
+DIM SHARED timero AS LONG
+DIM SHARED kblukk
+DIM SHARED tunnidara
+DIM SHARED errmsg$
+DIM SHARED cnflist$(1 TO 200)
+
+'ON ERROR GOTO 20
+
+start
+disp
+mnmain
+
+20
+LOCATE 20, 1
+COLOR 0, 15
+PRINT "Programmi t88s ilmus j2rgnev t6rge:"
+PRINT errmsg$
+PRINT "Programmi t2itmine katkestatud!  Abi saamiseks lugege juhendit."
+SYSTEM
+
+SUB chd
+b$ = "tuhi"
+IF apl = 0 THEN inita
+
+a$ = DATE$
+n1 = VAL(RIGHT$(a$, 4))
+n2 = VAL(LEFT$(a$, 2))
+a$ = LEFT$(a$, 5)
+n3 = VAL(RIGHT$(a$, 2))
+getNad n1, n2, n3, ndlp
+FOR a = 1 TO apl
+    son ap$(a)
+    SELECT CASE sona$(1)
+        CASE "v"
+            getMd sona$(2), m1, d1
+            getMd sona$(3), m2, d2
+            getMd DATE$, m3, d3
+            IF m3 < m1 THEN GOTO 9
+            IF m3 > m2 THEN GOTO 9
+            IF m3 = m1 THEN IF d3 < d1 THEN GOTO 9
+            IF m3 = m2 THEN IF d3 > d2 THEN GOTO 9
+            b$ = sona$(4)
+        CASE "n"
+            getMd sona$(2), m1, d1
+            getMd sona$(3), m2, d2
+            getMd DATE$, m3, d3
+            IF m3 < m1 THEN GOTO 9
+            IF m3 > m2 THEN GOTO 9
+            IF m3 = m1 THEN IF d3 < d1 THEN GOTO 9
+            IF m3 = m2 THEN IF d3 > d2 THEN GOTO 9
+            IF ndlp <> VAL(sona$(4)) THEN GOTO 9
+            b$ = sona$(5)
+        CASE "e"
+            getMd sona$(2), m1, d1
+            getMd DATE$, m2, d2
+            IF (m1 = m2) AND (d1 = d2) THEN b$ = sona$(3)
+    END SELECT
+9
+NEXT a
+
+IF b$ <> lp$ THEN initp b$
+lp$ = b$
+tunnidara = 0
+dispp
+disp
+END SUB
+
+SUB chm
+a$ = DATE$
+IF a$ <> dato$ THEN chd
+dato$ = a$
+b = 0
+FOR a = 1 TO ppl
+    son pp$(a)
+    SELECT CASE sona$(1)
+        CASE "#"
+            getMd sona$(2), h1, m1
+            getMd TIME$, h2, m2
+            ' PRINT h1, m1, h2, m2
+            IF (h2 = h1) AND (m2 = m1) THEN
+                IF sona$(3) = "sis" THEN b = 1
+                IF sona$(3) = "val" THEN b = 2
+            END IF
+        END SELECT
+    NEXT a
+
+IF (tunnidara = 0) AND (b > 0) THEN kell b
+ssave = ssave + 1
+END SUB
+
+SUB clrerr
+errmsg$ = "tundmatu viga. V6ibolla on v2he RAM m2lu?"
+END SUB
+
+SUB disp
+CLS
+PRINT "Kooli Kell 3     2003.09"
+PRINT "autor: Svjatoslav Agejenko  "
+PRINT ""
+PRINT "s - kell tundi sisse             v - kell tunnist v�lja"
+PRINT "a - sisesta uus aeg              d - sisesta uus daatum"
+PRINT "p - n2itab dokumentatsiooni      j - j�tab k�ik tunnid t�na �ra"
+PRINT "7 - 1 minut tagasi               8 - 1 minut edasi"
+PRINT "4 - 1 tund tagasi                5 - 1 tund edasi"
+PRINT "r - programmi restart            q - programmist v�lja"
+PRINT "k - konfiguratsiooni redaktor    CTRL+L - klaviatuuri lukk (sees/v2ljas)"
+
+dispp
+
+LOCATE 12, 15
+PRINT "Kuu-P�ev-Aasta (USA standard)"
+
+LOCATE 17
+
+FOR a = 1 TO ppl
+    IF pp$(a) <> SPACE$(LEN(pp$(a))) THEN
+        PRINT pp$(a);
+        PRINT SPACE$(15 - LEN(pp$(a)));
+    END IF
+NEXT a
+
+displukk
+dispt
+END SUB
+
+SUB displukk
+LOCATE 1, 40
+IF kblukk = 1 THEN
+    COLOR 0, 7
+    PRINT "Klaviatuur lukus! Vajuta CTRL+L"
+    COLOR 15, 0
+ELSE
+    PRINT "                               "
+END IF
+END SUB
+
+SUB dispp
+IF ndlp = 0 THEN GOTO 14
+LOCATE 14, 1
+PRINT "n�dalap�ev:", pn$(ndlp)
+LOCATE 15, 1
+PRINT "p�evaplaan:", lp$
+14
+END SUB
+
+SUB dispt
+LOCATE 16, 20
+COLOR 12 + 15, 0
+IF tunnidara = 1 THEN
+    PRINT "T2na on k6ik tunnid 2ra j2etud"
+ELSE
+    PRINT "                              "
+END IF
+COLOR 15, 0
+END SUB
+
+SUB editor
+23
+leiaconf
+CLS
+COLOR 0, 15
+LOCATE 1, 1
+PRINT SPACE$(80);
+LOCATE 1, 1
+PRINT "Konfiguratsiooni redaktor. Valige v�lja p�eva v6i aasta plaani."
+LOCATE 2, 1
+PRINT SPACE$(80)
+LOCATE 2, 1
+PRINT "  nr   nimi     laiend     suurus loomisdaatum"
+
+LOCATE 22, 1
+PRINT SPACE$(80)
+LOCATE 22, 1
+PRINT "K - valitud faili kustutamine   U - uus fail   ESC - redaktorist v�lja"
+p = 0
+v = 1
+17
+FOR a = 3 TO 21
+    IF a - 2 + p = v THEN
+        COLOR 0, 7
+        LOCATE a, 1
+        PRINT cnflist$(a - 2 + p) + SPACE$(55 - LEN(cnflist$(a - 2 + p)))
+        LOCATE a, 56
+        COLOR 31, 0
+        PRINT "<=="
+        IF cnflist$(a - 2 + p) <> SPACE$(LEN(cnflist$(a - 2 + p))) THEN
+            COLOR 15, 0
+            PRINT " valitud: " + getName$(v)
+        END IF
+        COLOR 15, 0
+    ELSE
+        COLOR 15, 0
+        LOCATE a, 1
+        PRINT cnflist$(a - 2 + p) + SPACE$(80 - LEN(cnflist$(a - 2 + p)))
+    END IF
+NEXT a
+
+a$ = INKEY$
+LOCATE 1, 1
+'IF a$ <> "" THEN PRINT ASC(RIGHT$(a$, 1)); ASC(LEFT$(a$, 1))
+IF a$ = CHR$(27) THEN GOTO 18
+IF a$ = "u" OR a$ = "U" THEN SHELL "EDIT": GOTO 23
+IF a$ = CHR$(0) + "P" THEN v = v + 1
+IF a$ = CHR$(0) + "H" THEN v = v - 1
+IF a$ = CHR$(0) + CHR$(73) THEN v = v - 17
+IF a$ = CHR$(0) + CHR$(81) THEN v = v + 17
+IF a$ = "K" OR a$ = "k" THEN
+    IF LEN(getName$(v)) > 2 THEN
+        IF getName$(v) = "AASTA.AP" THEN
+            SOUND 3000, .1
+        ELSE
+            KILL getName$(v)
+            GOTO 23
+        END IF
+    ELSE
+        SOUND 3000, .1
+    END IF
+END IF
+IF a$ = CHR$(13) THEN
+    IF getName$(v) = "." THEN
+        SOUND 3000, .1
+    ELSE
+        SHELL "EDIT " + getName$(v)
+        GOTO 23
+    END IF
+END IF
+
+IF v < 1 THEN v = 1: SOUND 3000, .2
+IF v > 200 THEN v = 200: : SOUND 3000, .2
+
+21
+IF v - p > 19 THEN p = p + 1: GOTO 21
+22
+IF v - p < 1 THEN p = p - 1: GOTO 22
+
+GOTO 17
+18
+COLOR 15, 0
+disp
+END SUB
+
+SUB getMd (a$, m, d)
+b$ = LEFT$(a$, 5)
+m = VAL(LEFT$(b$, 2))
+d = VAL(RIGHT$(b$, 2))
+
+END SUB
+
+SUB getNad (g, n, d, k)
+'LOCATE 11, 1
+'PRINT g, n, d
+p = g
+m = n - 2
+IF n > 2 GOTO 120
+p = p - 1: m = m + 12
+120
+c = INT(p / 100)
+y = p - c * 100
+w = d + INT((13 * m - 1) / 5) + y + INT(y / 4) + INT(c / 4) - 2 * c
+k = w - 7 * INT(w / 7)
+IF k = 0 THEN k = 7
+END SUB
+
+FUNCTION getName$ (a)
+c$ = ""
+FOR b = 8 TO 40
+    d$ = getSym(cnflist$(a), b)
+    IF d$ = " " THEN GOTO 19
+    c$ = c$ + d$
+NEXT b
+19
+getName$ = c$ + "." + getSym(cnflist$(a), 17) + getSym(cnflist$(a), 18)
+END FUNCTION
+
+FUNCTION getSym$ (a$, b)
+getSym$ = RIGHT$(LEFT$(a$, b), 1)
+END FUNCTION
+
+SUB heli (a)
+'GOTO 10
+SELECT CASE a
+    CASE 1
+        FOR c = 1 TO 5
+            SOUND 3000, 1
+            SOUND 0, 1
+        NEXT c
+
+    CASE 2
+        FOR c = 1 TO 5
+            SOUND 2500, 1
+            SOUND 0, 2
+        NEXT c
+        SOUND 2500, 10
+
+    CASE 3
+        FOR a = 1 TO 10
+            SOUND 500, .5
+            SOUND 1500, .5
+            SOUND 2000, .5
+            SOUND 1520, .5
+        NEXT a
+
+    CASE 4
+        FOR a = 800 TO 1000 STEP 10
+            SOUND a, .1
+            SOUND a * 3, .1
+            SOUND 0, 1
+        NEXT a
+    10
+END SELECT
+
+END SUB
+
+SUB inita
+apl = 0
+errmsg$ = "Ei leia aastaplaani faili! 'aasta.ap'"
+OPEN "aasta.ap" FOR INPUT AS #1
+clrerr
+5
+IF EOF(1) <> 0 THEN GOTO 3
+LINE INPUT #1, a$
+apl = apl + 1
+ap$(apl) = a$
+GOTO 5
+3
+CLOSE #1
+END SUB
+
+SUB initp (b$)
+ppl = 0
+errmsg$ = "Ei leia aastaplaanis mainitud '" + b$ + ".pp' p�evaplaani!"
+OPEN b$ + ".pp" FOR INPUT AS #1
+clrerr
+6
+IF EOF(1) <> 0 THEN GOTO 7
+LINE INPUT #1, a$
+ppl = ppl + 1
+pp$(ppl) = a$
+GOTO 6
+7
+CLOSE #1
+END SUB
+
+SUB kell (a)
+b$ = TIME$ + DATE$
+IF b$ <> lk$ THEN lk$ = b$ ELSE GOTO 2
+
+heli 3
+
+SELECT CASE a
+    CASE 1
+        kola 4
+        FOR b = 1 TO 15
+            SOUND 0, 1
+        NEXT b
+        kola 1
+
+    CASE 2
+        kola 5
+END SELECT
+2
+
+END SUB
+
+SUB kola (a)
+COLOR 15, 7
+s$ = ""
+FOR b = 1 TO 80
+    s$ = s$ + CHR$(219)
+NEXT b
+FOR b = 1 TO 30
+    PRINT s$;
+NEXT b
+
+timero = TIMER
+11
+OUT prt, 255
+IF ABS(timero - TIMER) < a THEN GOTO 11
+OUT prt, 0
+COLOR 15, 0
+disp
+END SUB
+
+SUB leiaconf
+FOR a = 1 TO 200
+    cnflist$(a) = ""
+NEXT a
+c = 1
+
+SHELL "dir >dir.tmp"
+OPEN "dir.tmp" FOR INPUT AS #1
+15
+IF EOF(1) <> 0 THEN GOTO 16
+LINE INPUT #1, a$
+IF LEN(a$) < 30 THEN GOTO 15
+IF LEFT$(a$, 1) = " " THEN GOTO 15
+IF LEFT$(a$, 1) = "." THEN GOTO 15
+b$ = RIGHT$(LEFT$(a$, 12), 3)
+IF b$ = "PP " OR b$ = "AP " THEN ELSE GOTO 15
+d$ = "    " + STR$(c)
+a$ = RIGHT$(d$, 4) + "   " + a$
+IF LEN(a$) > 50 THEN a$ = LEFT$(a$, 50)
+cnflist$(c) = a$
+c = c + 1
+GOTO 15
+16
+CLOSE #1
+KILL "dir.tmp"
+END SUB
+
+SUB mnmain
+1
+b$ = LEFT$(TIME$, 5)
+IF b$ <> timo$ THEN chm
+timo$ = b$
+
+a$ = INKEY$
+
+IF a$ <> "" THEN
+    IF ssave > ssavel THEN disp
+    ssave = 0
+END IF
+
+IF a$ = CHR$(12) THEN
+    IF kblukk = 1 THEN kblukk = 0 ELSE kblukk = 1
+    displukk
+END IF
+IF kblukk = 1 THEN
+    IF a$ <> "" THEN SOUND 3000, 1
+    a$ = ""
+END IF
+IF a$ = "k" OR a$ = "K" THEN editor
+
+IF a$ = "s" OR a$ = "S" THEN kell 1
+IF a$ = "v" OR a$ = "V" THEN kell 2
+
+IF a$ = "a" THEN
+    CLS
+    PRINT "                  vana aeg: " + TIME$
+    INPUT "sisesta uus aeg (TT:MM:SS): ", b$
+    IF LEN(b$) <> 8 THEN GOTO 12
+    TIME$ = b$
+    timo$ = ""
+    12
+    disp
+END IF
+
+IF a$ = "d" OR a$ = "D" THEN
+    CLS
+    PRINT "                    vana daatum: " + DATE$
+    INPUT "sisesta uus daatum (KK-PP-AAAA): ", b$
+    IF LEN(b$) <> 10 THEN GOTO 13
+    DATE$ = b$
+    timo$ = ""
+    13
+    disp
+END IF
+
+IF a$ = "7" OR a$ = "8" THEN
+    b = VAL(RIGHT$(LEFT$(TIME$, 5), 2))
+    IF a$ = "7" THEN b = b - 1
+    IF a$ = "8" THEN b = b + 1
+    IF b < 0 THEN b = 0
+    IF b > 59 THEN b = 59
+    d$ = STR$(b)
+    IF LEFT$(d$, 1) = " " THEN d$ = RIGHT$(d$, LEN(d$) - 1)
+    IF LEN(d$) < 2 THEN d$ = "0" + d$
+    e$ = LEFT$(TIME$, 3) + d$ + RIGHT$(TIME$, 3)
+    TIME$ = e$
+END IF
+
+IF a$ = "4" OR a$ = "5" THEN
+    b = VAL(LEFT$(TIME$, 2))
+    IF a$ = "4" THEN b = b - 1
+    IF a$ = "5" THEN b = b + 1
+    IF b < 0 THEN b = 0
+    IF b > 23 THEN b = 23
+    d$ = STR$(b)
+    IF LEFT$(d$, 1) = " " THEN d$ = RIGHT$(d$, LEN(d$) - 1)
+    IF LEN(d$) < 2 THEN d$ = "0" + d$
+    e$ = d$ + RIGHT$(TIME$, 6)
+    TIME$ = e$
+END IF
+
+IF a$ = "p" OR a$ = "P" THEN SHELL "EDIT juhend.txt": disp
+
+IF a$ = "r" OR a$ = "R" THEN rese
+IF a$ = "q" OR a$ = "Q" THEN SYSTEM
+
+IF a$ = "j" OR a$ = "J" THEN
+    IF tunnidara = 0 THEN tunnidara = 1 ELSE tunnidara = 0
+    dispt
+END IF
+
+IF ssave <= ssavel THEN
+    LOCATE 11, 1
+    PRINT TIME$
+    LOCATE 12, 1
+    PRINT DATE$
+ELSE
+    IF ABS(TIMER - timero) > 10 THEN
+        CLS
+        kblukk = 1
+        FOR b = 1 TO 20
+            LOCATE RND * 22 + 1, RND * 79 + 1
+            IF RND * 100 < 50 THEN PRINT "*" ELSE PRINT "."
+        NEXT b
+        LOCATE RND * 22 + 1, RND * 50 + 1
+        COLOR 0, 7
+        PRINT "< " + LEFT$(TIME$, 2);
+        COLOR 16, 7
+        PRINT ":";
+        COLOR 0, 7
+        PRINT RIGHT$(LEFT$(TIME$, 5), 2) + " >"
+        COLOR 15, 0
+        timero = TIMER
+    END IF
+END IF
+GOTO 1
+
+END SUB
+
+SUB rese
+heli 4
+timo$ = ""
+dato$ = ""
+apl = 0
+END SUB
+
+SUB son (a$)
+
+FOR b = 1 TO 50
+    sona$(b) = ""
+NEXT b
+mitus = 0
+
+b = 1
+FOR c = 1 TO LEN(a$)
+    d$ = RIGHT$(LEFT$(a$, c), 1)
+    IF d$ = " " OR d$ = CHR$(9) THEN
+        b = 1
+    ELSE
+        IF b = 1 THEN b = 0: mitus = mitus + 1
+        sona$(mitus) = sona$(mitus) + d$
+    END IF
+NEXT c
+
+END SUB
+
+SUB start
+CLS
+COLOR 15
+pn$(1) = "esmasp�ev"
+pn$(2) = "teisip�ev"
+pn$(3) = "kolmap�ev"
+pn$(4) = "neljap�ev"
+pn$(5) = "reede"
+pn$(6) = "laup�ev"
+pn$(7) = "p�hap�ev"
+
+prt = &H378
+
+ssavel = 2
+kblukk = 1
+tunnidara = 0
+
+OUT prt, 0
+END SUB
diff --git a/Miscellaneous/Automated school clock/v3/luhend.pp b/Miscellaneous/Automated school clock/v3/luhend.pp
new file mode 100644
index 0000000..8c36fd4
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v3/luhend.pp	
@@ -0,0 +1,27 @@
+# 08:30 sis
+# 09:00 val
+
+# 09:10 sis
+# 09:40 val
+
+# 09:50 sis
+# 10:20 val
+
+# 10:30 sis
+# 11:00 val
+
+# 11:30 sis
+# 12:00 val
+
+# 12:10 sis
+# 12:40 val
+
+# 12:50 sis
+# 13:20 val
+
+# 13:30 sis
+# 14:00 val
+
+# 14:05 sis
+# 14:35 val
+
diff --git a/Miscellaneous/Automated school clock/v3/reede.pp b/Miscellaneous/Automated school clock/v3/reede.pp
new file mode 100644
index 0000000..b4c0e82
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v3/reede.pp	
@@ -0,0 +1,23 @@
+# 08:30 sis
+# 09:15 val
+
+# 09:25 sis
+# 10:10 val
+
+# 10:20 sis
+# 11:05 val
+
+# 11:35 sis
+# 12:20 val
+
+# 12:30 sis
+# 13:15 val
+
+# 13:20 sis
+# 14:05 val
+
+# 14:10 sis
+# 14:55 val
+
+# 15:00 sis
+# 15:45 val
diff --git a/Miscellaneous/Automated school clock/v3/skeem.png b/Miscellaneous/Automated school clock/v3/skeem.png
new file mode 100644
index 0000000..9c3e95b
Binary files /dev/null and b/Miscellaneous/Automated school clock/v3/skeem.png differ
diff --git a/Miscellaneous/Automated school clock/v3/tava.pp b/Miscellaneous/Automated school clock/v3/tava.pp
new file mode 100644
index 0000000..e83ded7
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v3/tava.pp	
@@ -0,0 +1,29 @@
+# 08:30 sis
+# 09:15 val
+
+# 09:25 sis
+# 10:10 val
+
+# 10:20 sis
+# 11:05 val
+
+# 11:35 sis
+# 12:20 val
+
+# 12:30 sis
+# 13:15 val
+
+# 13:25 sis
+# 14:10 val
+
+# 14:20 sis
+# 15:05 val
+
+# 15:10 sis
+# 15:55 val
+
+# 16:00 sis
+# 16:45 val
+
+# 16:50 sis
+# 17:35 val
\ No newline at end of file
diff --git a/Miscellaneous/Automated school clock/v3/tuhi.pp b/Miscellaneous/Automated school clock/v3/tuhi.pp
new file mode 100644
index 0000000..d3f5a12
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v3/tuhi.pp	
@@ -0,0 +1 @@
+
diff --git a/Miscellaneous/Automated school clock/v3/tutorial.org b/Miscellaneous/Automated school clock/v3/tutorial.org
new file mode 100644
index 0000000..19dd2dc
--- /dev/null
+++ b/Miscellaneous/Automated school clock/v3/tutorial.org	
@@ -0,0 +1,113 @@
+* Kooli Kell 3 programmi kasutusjuhend
+- 2003.09 :: Esimene versioon.
+- 2025 :: Parendatud juhendi sõnastus.
+
+- Programmi, juhendi ja skeemi autor :: Svjatoslav Agejenko
+- E-post :: svjatoslav@svjatoslav.eu
+- kodulehekülg :: https://www.svjatoslav.eu
+
+Ettevaatust: Siin tekstis olev info võib olla vananenud, vigane v6i
+ebatäielik. Autor ei võta endale vastutust antud süsteemi kasutamisest
+tekkinud otsese või kaudse kahju puhul!
+
+* Üldinfo
+
+Programm Kooli Kell on mõeldud kella laskmiseks koolis, tundi sisse ja
+välja.
+
+- Tundi sisse minev kell on 1 pikk ning 1 lühem helin.
+- Väljaminev kell on 1 tavaline pikk helin.
+
+Programm loeb aega arvuti süsteemsest kellast.  Fail 'AASTA.AP' hoiab
+aasta graafikut, kus saab määrata teatud päeva kohta käiva
+päevaplaani. Päevaplaanid asuvad failides '*.PP'.
+
+Aasta või päevaplaani muutmiseks tuleb redigeerida vastavaid faile.
+Failides on info esitatud programmile 'Kooli Kell' arusaadavate
+käskudena. Kus ühel real on üks käsk, või tühi rida. Rea esimene sõna
+peab olema käsk, ning järgnevad sõnad on selle käsu parameetrid. Sõnad
+võivad olla eraldatud suvalise 0 suuremate tabulaatorite ja/või
+tühikute arvuga. Programmi saab kasutada arvutil millele on ühendatud
+spetsiaalne liides, või millel on see liides sisse
+monteeritud. Liideses olev relee toimib lülitina, mis kella laskmise
+ajaks sulgub. Liides vooluahelasse ise voolu ei anna. Seega on liides
+mõeldud kella ja toiteallikaga vooluahelasse jadamisi
+ühendamiseks. Või siis olemasoleva mehaanilise kella laskmis nupuga
+paralleelselt, siis saab kella lasta nii endisest nupust kui ka
+arvutiga.
+
+Programm on ettenähtud iseseisvalt töötama, kuid on ka võimalus
+erandkorras k2sitsi kella lasta, aega muuta jne.  Selleks tuleb
+vajutada erinevaid klahve klaviatuuril.  K2ivitudes kuvab programm
+klahvide kirjeldused ekraanile.
+
+* faili AASTA.AP formaat
+
+Lõpp 'AP' tuleneb sõnadest Aasta plaan.
+
+: v       <kuu>-<päev>    <kuu>-<päev>    <päevaplaan>
+
+Sõnast vahemik. Paneb paika p2evaplaani antud ajavahemikus. Esimene
+daatum peab kindlasti olema v2iksem kui teine. St. kui on tõesti vaja:
+
+: v   10-4    2-1 eri
+
+tuleb kirjutada:
+
+: v   10-4    12-31   eri
+: v   1-1 2-1 eri
+
+P2evaplaan kehtib vahemiku esimesest p2evast kuni vahemiku viimase p2evani.
+
+: n       <kuu>-<päev>    <kuu>-<päev>    <nädalapäev>    <päevaplaan>
+
+Sõnast n2dalap2ev. sama mis "v" kuid: paneb paika p2evaplaani antud
+ajavahemikus, antud n2dalap2eval. N2dalap2eva kirjeldatakse numbriga.
+n2dala esimene p2ev on esmasp2ev, talle vastab number 1.
+
+: e   <kuu>-<päev> <päevaplaan>
+
+Sõnast eripäevaplaan. Paneb paika antud kuupäevale antud päevaplaani.
+Sobib hästi erakorraliste, lühendatud või uhekordselt kehtivate
+päevaplaanide kehtestamiseks. Näiteks riigipühad, spordipäev jne.
+
+Kui teatud päeva kohta ei käinud ühtegi kirjet siis toimib vaikimisi "tuhi"
+päevaplaan. Kui teatud päeva kohta käis mitu kirjet siis jääb peale viimane.
+
+* failide *.PP formaat
+
+Lõpp 'PP' tuleneb sõnadest Päeva Plaan.
+
+: #   <tund>:<minut>  <kell>
+
+Laseb antud ajal antud kella. Võimalikud kella helinad on:
+
+- sis :: -kell tundi sisse
+- val :: -kell tunnist välja
+
+* Raudvara nõuded
+
+- 286 protsessoriga PC tüüpi arvuti. :: Peaks töötama ka 8086 protsessoril aga pole testinud.
+
+- 640 KB põhimälu :: Vähemaga pole testinud.
+
+- 500 KB vaba kettaruumi :: Kõvakettalt töö kiirendab oluliselt
+  programmi käivitumist, ja konfiguratsiooni redigeerimist.
+
+- LPT port.
+
+- Monitor :: Võib olla mustvalge
+
+- Klaviatuur.
+
+* Tarkvara nõuded
+
+- DOS 6.22 :: Võib ka varasem, kuid pole testinud.
+- QB 4.5 :: Piisab 'QB.EXE' failist. Peaks t88tama ka MS QBasic-us.
+- EDIT.EXE :: DOSi käsurealt käivituv teksti redaktor.
+
+* Nõuded inimesele
+
+Süsteemi kasutamiseks hädavajalik antud juhendist aru saamine.
+Süsteemi paigaldamine nõuab elektriku oskusi. Programmi kasutamiseks
+on vajalik vähemalt algaja tasemel arvutikasutaja oskus.
diff --git a/Miscellaneous/Custom palette, 2.png b/Miscellaneous/Custom palette, 2.png
new file mode 100644
index 0000000..9fe22b5
Binary files /dev/null and b/Miscellaneous/Custom palette, 2.png differ
diff --git a/Miscellaneous/Custom palette, 3.png b/Miscellaneous/Custom palette, 3.png
new file mode 100644
index 0000000..83065f1
Binary files /dev/null and b/Miscellaneous/Custom palette, 3.png differ
diff --git a/Miscellaneous/Custom palette.bas b/Miscellaneous/Custom palette.bas
new file mode 100644
index 0000000..332b85a
--- /dev/null
+++ b/Miscellaneous/Custom palette.bas	
@@ -0,0 +1,167 @@
+' An attempt to generate a universally reusable color palette for 256 color limit.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001, Initial version.
+' 2024.08, Enhance program readability
+
+DEFINT A-Y
+SCREEN 13
+CLS
+
+' Initialize color index
+colorIndex = 0
+
+' Generate colors by varying red, green, and blue components from 0 to 5
+FOR redComponent = 0 TO 5
+    FOR greenComponent = 0 TO 5
+        FOR blueComponent = 0 TO 5
+            ' Set the color for the next pixel
+            OUT &H3C8, colorIndex
+            colorIndex = colorIndex + 1
+
+            ' Output the RGB components to the palette registers
+            OUT &H3C9, redComponent * 12
+            OUT &H3C9, greenComponent * 12
+            OUT &H3C9, blueComponent * 12
+        NEXT blueComponent
+    NEXT greenComponent
+NEXT redComponent
+
+' Draw a grid of colored squares using the generated color palette
+FOR colorIndex = 0 TO 5
+    FOR blueComponent = 0 TO 5
+        FOR redComponent = 0 TO 5
+            ' Draw a square with the calculated color
+            LINE (redComponent * 5 + colorIndex * 30, blueComponent * 5)-_
+                   (redComponent * 5 + 4 + colorIndex * 30, blueComponent * 5 + 4), _
+                   colorIndex * 36 + blueComponent * 6 + redComponent, BF
+        NEXT redComponent
+    NEXT blueComponent
+NEXT colorIndex
+
+' Wait for user input before proceeding
+a$ = INPUT$(1)
+
+' Initialize coordinates for pattern drawing
+patternEx = -100
+patternEy = 0
+
+' Draw a series of patterns with varying colors
+FOR patternZ = 0 TO 75 STEP 15
+    ' Calculate the vertices of an equilateral triangle
+    x1 = 50 - (patternZ / 2)
+    y1 = 50 - (patternZ * .866025)
+    x2 = 50 + patternZ
+    y2 = 50
+    x3 = x1
+    y3 = 100 - y1
+
+    ' Move to the next starting position for the pattern
+    patternEx = patternEx + 100
+    IF patternZ = 45 THEN
+        patternEx = patternEx - 300
+        patternEy = patternEy + 101
+    END IF
+
+    ' Draw the pattern by calculating colors based on distance from triangle vertices
+    FOR x = 0 TO 100
+        FOR y = 0 TO 100
+            ' Calculate color components based on distance to each vertex
+            r = 7 - (SQR((x1 - x) ^ 2 + (y1 - y) ^ 2) / 15 + 1)
+            g = 7 - (SQR((x2 - x) ^ 2 + (y2 - y) ^ 2) / 15 + 1)
+            b = 7 - (SQR((x3 - x) ^ 2 + (y3 - y) ^ 2) / 15 + 1)
+
+            ' Clamp color values within the range of 0 to 5
+            IF r < 0 THEN r = 0
+            IF g < 0 THEN g = 0
+            IF b < 0 THEN b = 0
+            IF r > 5 THEN r = 5
+            IF g > 5 THEN g = 5
+            IF b > 5 THEN b = 5
+
+            ' Calculate the final color index
+            colorIndex = r * 36 + g * 6 + b
+
+            ' Plot the pixel with the calculated color
+            PSET (x + patternEx, y + patternEy), colorIndex
+        NEXT y
+    NEXT x
+NEXT patternZ
+
+' Wait for user input before proceeding
+a$ = INPUT$(1)
+
+' Reset starting position for the second pattern
+patternEx = -100
+patternEy = 0
+
+' Draw a second series of patterns using color dithering, to create
+' seemingly smooth color transitions while still having only 8bit colors to work with
+FOR patternZ = 0 TO 75 STEP 15
+    ' Calculate the vertices of an equilateral triangle with different scaling
+    x1 = 50 - (patternZ / 2.5)
+    y1 = 50 - (patternZ * .566025)
+    x2 = 50 + patternZ / 1.5
+    y2 = 50
+    x3 = x1
+    y3 = 100 - y1
+
+    ' Move to the next starting position for the pattern
+    patternEx = patternEx + 100
+    IF patternZ = 45 THEN
+        patternEx = patternEx - 300
+        patternEy = patternEy + 101
+    END IF
+
+    ' Initialize accumulators for dithering color components
+    rSum = 0
+    gSum = 0
+    bSum = 0
+
+    ' Draw the pattern by calculating average colors based on distance from triangle vertices
+    FOR x = 0 TO 100
+        FOR y = 0 TO 100
+            ' Calculate color components based on distance to each vertex
+            r = 30 - (SQR((x1 - x) ^ 2 + (y1 - y) ^ 2) / 2 + 1)
+            g = 30 - (SQR((x2 - x) ^ 2 + (y2 - y) ^ 2) / 2 + 1)
+            b = 30 - (SQR((x3 - x) ^ 2 + (y3 - y) ^ 2) / 2 + 1)
+
+            ' Accumulate the color components
+            rSum = rSum + r
+            gSum = gSum + g
+            bSum = bSum + b
+
+            ' Calculate the average color components over a span of 5 pixels
+            rAvg = rSum / 5
+            gAvg = gSum / 5
+            bAvg = bSum / 5
+
+            ' Reset the sums after calculating the averages
+            rSum = rSum - (rAvg * 5)
+            gSum = gSum - (gAvg * 5)
+            bSum = bSum - (bAvg * 5)
+
+            ' Clamp average color values within the range of 0 to 5
+            IF rAvg < 0 THEN rAvg = 0
+            IF gAvg < 0 THEN gAvg = 0
+            IF bAvg < 0 THEN bAvg = 0
+            IF rAvg > 5 THEN rAvg = 5
+            IF gAvg > 5 THEN gAvg = 5
+            IF bAvg > 5 THEN bAvg = 5
+
+            ' Calculate the final color index
+            colorIndex = rAvg * 36 + gAvg * 6 + bAvg
+
+            ' Plot the pixel with the calculated color
+            PSET (x + patternEx, y + patternEy), colorIndex
+        NEXT y
+    NEXT x
+NEXT patternZ
+
+' Wait for user input before exiting
+a$ = INPUT$(1)
\ No newline at end of file
diff --git a/Miscellaneous/Custom palette.png b/Miscellaneous/Custom palette.png
new file mode 100644
index 0000000..8b62b42
Binary files /dev/null and b/Miscellaneous/Custom palette.png differ
diff --git a/Miscellaneous/Database/auto.scr b/Miscellaneous/Database/auto.scr
new file mode 100644
index 0000000..6716870
--- /dev/null
+++ b/Miscellaneous/Database/auto.scr
@@ -0,0 +1,3 @@
+fload data.ddb
+chklin 1 |> s 1
+|> c
\ No newline at end of file
diff --git a/Miscellaneous/Database/data.ddb b/Miscellaneous/Database/data.ddb
new file mode 100644
index 0000000..6094893
--- /dev/null
+++ b/Miscellaneous/Database/data.ddb
@@ -0,0 +1,11 @@
+// 1 First name
+// 2 Last name
+// 3 Postal address
+// 4 Phone
+// 5 Sex M / F
+// 6 Registration number in the database
+// 7 Birth year
+
+John		|Doe		|Marshmelow road 1-23 	| +385 123123123 |M|0|1985
+Jane  		|Doe		|Candy road 1-23	| +385 123123124 |F|1|1987
+
diff --git a/Miscellaneous/Database/ddbase6.bas b/Miscellaneous/Database/ddbase6.bas
new file mode 100755
index 0000000..3062e41
--- /dev/null
+++ b/Miscellaneous/Database/ddbase6.bas
@@ -0,0 +1,975 @@
+' Simple scriptable relational database engine.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2024, Improved program readability
+
+DECLARE SUB box (x1%, y1%, x2%, y2%)
+DECLARE SUB ssort (s%, m%)
+DECLARE SUB sort (s%, w%)
+REM $DYNAMIC
+DECLARE SUB cmp (a$, b$, r%)
+DECLARE SUB boss ()
+DECLARE SUB std (a$)
+DECLARE FUNCTION cnum$ (a%)
+DECLARE SUB fload (a$, b%, c%, d%)
+DECLARE SUB putfs (f%, l%, s%, c$)
+DECLARE SUB gets (l%, s%, a$)
+DECLARE SUB puts (l%, s%, a$)
+DECLARE SUB runf (a$)
+DECLARE SUB getfil (a%)
+DEFINT A-Y
+DECLARE SUB mkson (a$)
+DECLARE SUB title (a$)
+DECLARE SUB strip (a$, b$)
+DECLARE SUB cmd (a$)
+DECLARE SUB conkey (a$)
+DECLARE SUB conn (a$)
+DECLARE SUB ch ()
+DECLARE SUB chkey (a$)
+DECLARE SUB getkey (a$)
+DECLARE SUB conm (d$, c)
+DECLARE SUB start ()
+
+DIM SHARED con$(1 TO 50)
+DIM SHARED conc(1 TO 50)
+DIM SHARED concmd$
+DIM SHARED conx
+DIM SHARED sona$(1 TO 20)
+DIM SHARED mitus
+
+DIM SHARED buf$(1 TO 5000)
+DIM SHARED bufu(1 TO 5000)
+DIM SHARED bufl(1 TO 1000, 1 TO 30)
+DIM SHARED buflu(1 TO 1000)
+DIM SHARED lng
+DIM SHARED opf(1 TO 30)
+DIM SHARED hist$(1 TO 20)
+DIM SHARED histp, histk
+DIM SHARED buff(1 TO 30, 1 TO 1000)
+DIM SHARED stack(1 TO 2000, 1 TO 10)
+DIM SHARED stackl(1 TO 10)
+DIM SHARED stdl
+
+start
+
+1
+ch
+GOTO 1
+
+REM $STATIC
+SUB boss
+y1 = 0
+yp1 = 100
+y2 = 0
+yp2 = 100
+
+lx = 160
+ly = 100
+lxp = 1
+lyp = -1
+
+SCREEN 13
+
+GOSUB 18
+16
+a$ = INKEY$
+IF a$ = CHR$(0) + "H" THEN yp1 = yp1 - 25
+IF a$ = CHR$(0) + "P" THEN yp1 = yp1 + 25
+IF a$ = CHR$(27) THEN GOTO 17
+
+LINE (10, y1 - 35)-(20, y1 + 35), 0, B
+LINE (11, y1 - 34)-(19, y1 + 34), 15, B
+
+LINE (310, y2 - 35)-(300, y2 + 35), 0, B
+LINE (309, y2 - 34)-(301, y2 + 34), 15, B
+
+LINE (lx - 10, ly - 10)-(lx + 10, ly + 10), 0, B
+LINE (lx - 9, ly - 9)-(lx + 9, ly + 9), 15, B
+
+lx = lx + lxp
+ly = ly + lyp
+IF ly < 20 THEN lyp = 1
+IF ly > 180 THEN lyp = -1
+IF lx < 30 THEN
+    lxp = 1
+    IF ly < y1 - 35 OR ly > y1 + 35 THEN SOUND 1000, 1
+END IF
+IF lx > 290 THEN
+    lxp = -1
+    GOSUB 18
+END IF
+
+IF yp1 > 0 THEN y1 = y1 + 1: yp1 = yp1 - 1
+IF yp1 < 0 THEN y1 = y1 - 1: yp1 = yp1 + 1
+IF yp2 > 0 THEN y2 = y2 + 1: yp2 = yp2 - 1
+IF yp2 < 0 THEN y2 = y2 - 1: yp2 = yp2 + 1
+
+SOUND 0, .1
+GOTO 16
+
+18
+tlx = lx
+tly = ly
+tlyp = lyp
+tlxp = lxp
+
+19
+lx = lx + lxp
+ly = ly + lyp
+IF ly < 20 THEN lyp = 1
+IF ly > 180 THEN lyp = -1
+IF lx < 30 THEN lxp = 1
+IF lx > 290 THEN
+    yp2 = ly - y2
+ELSE
+    GOTO 19
+END IF
+
+SWAP lx, tlx
+SWAP ly, tly
+SWAP lyp, tlyp
+SWAP lxp, tlxp
+RETURN
+
+17
+SCREEN 0
+WIDTH 80, 50
+VIEW PRINT 1 TO 50
+END SUB
+
+SUB box (x1, y1, x2, y2)
+b$ = ""
+c$ = ""
+FOR a = x1 TO x2
+    b$ = b$ + " "
+    c$ = c$ + "-"
+NEXT a
+
+b$ = "|" + b$ + "|"
+c$ = "|" + c$ + "|"
+
+COLOR 14, 0
+LOCATE y1, x1
+PRINT c$
+LOCATE y2, x1
+PRINT c$
+FOR a = y1 + 1 TO y2 - 1
+    LOCATE a, y1
+    PRINT b$
+NEXT a
+
+END SUB
+
+SUB ch
+chkey a$
+IF a$ <> "" THEN conkey a$
+
+END SUB
+
+SUB chkey (a$)
+a$ = INKEY$
+IF a$ <> "" THEN
+    IF a$ = CHR$(0) + "M" THEN a$ = "pa"
+    IF a$ = CHR$(0) + "K" THEN a$ = "va"
+    IF a$ = CHR$(0) + "H" THEN a$ = "ul"
+    IF a$ = CHR$(0) + "P" THEN a$ = "al"
+END IF
+
+END SUB
+
+SUB cmd (a$)
+IF a$ = SPACE$(LEN(a$)) THEN GOTO 5
+conm a$, 14
+
+mkson a$
+IF mitus = 0 THEN GOTO 5
+
+SELECT CASE sona$(1)
+CASE "help"
+    title "help"
+    conm "help   - for help", 7
+    conm "quit   - quit program", 7
+    conm "b      - boss screen", 7
+    conm "memstat- show info about memory blocks", 7
+    conm "memput <addr> <data> - put data to specified memory block", 7
+    conm "memlist <addr> <amount> - show memory blocks, starting from <addr>", 7
+    conm "runf <file.ext> - run script file", 7
+    conm "lnstat - show info about memory lines", 7
+    conm "lnput <line> <word> <data> <data> ... put data in <line> starting from <word>", 7
+    conm "lnlist <addr> <amount> - show contenc of memory lines", 7
+    conm "fstat - show info about memory files", 7
+    conm "fput <file> <line> <word> <data> <data> ... put data in memory file", 7
+    conm "fload <filename.ext> <file> <line> <word>- load data file into memory file", 7
+    conm "cls    - clear screen", 7
+    conm "stclear <stack> - clear stack", 7
+    conm "chklin <page> <from line> <to line> - determine used line numbers to STDOUT", 7
+    conm "stacksize <stack> - determine stack size to STDOUT", 7
+    conm "filtand <stack> <word> <mask> <word> <mask> ... filters out lines to STDOUT", 7
+    conm "filtor <stack> <word> <mask> <word> <mask> ... filters out lines to STDOUT", 7
+    conm "disp <stack> <word> <word> ... display formatted selected cells to STDOUT", 7
+    conm "sort <stack> <word> - sort elements by <word> value, lower first", 7
+    conm "swap <stack> - swap stack elements (backwards)", 7
+    conm "ssort <stack> <word> - sort stack in alphabetical order", 7
+    conm "memget <pointer> - allocates memory block, and puts there -", 7
+    conm "liststack <stack> <from line> <to line> - show stack values to STDOUT", 7
+    conm "ask <question> <file> <line> <word> - asks question, and stores result", 7
+    conm "flnget <file> <pointer> - get unused line in file", 7
+GOTO 5
+
+CASE "quit"
+SYSTEM
+
+CASE "memstat"
+title "memory blocks summary"
+c = 0
+lng = 0
+FOR b = 1 TO 5000
+    IF bufu(b) > 0 THEN c = c + 1
+    lng = lng + LEN(buf$(b))
+NEXT b
+d$ = "memory blocks used:" + STR$(c) + "  total 5000"
+conm d$, 7
+d$ = "data size:" + STR$(lng)
+conm d$, 7
+GOTO 5
+
+CASE "memput"
+b = VAL(sona$(2))
+strip sona$(3), c$
+IF c$ = "" THEN
+    bufu(b) = 0
+    buf$(b) = ""
+ELSE
+    bufu(b) = 1
+    buf$(b) = sona$(3)
+END IF
+GOTO 5
+
+CASE "memlist"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+IF b = 0 THEN b = 1
+IF c = 0 THEN c = 1
+
+FOR d = b TO 5000
+    IF c = 0 THEN GOTO 5
+    IF bufu(d) > 0 THEN
+        e$ = cnum(d) + ":" + SPACE$(5 - LEN(cnum(d)))
+        e$ = e$ + buf$(d)
+        conm e$, 7
+        c = c - 1
+    END IF
+NEXT d
+GOTO 5
+
+CASE "runf"
+runf sona$(2)
+GOTO 5
+
+CASE "lnstat"
+title "memory lines summary"
+c = 0
+d = 0
+FOR b = 1 TO 1000
+    IF buflu(b) > 0 THEN c = c + 1: d = d + buflu(b)
+NEXT b
+d$ = "memory lines used:" + STR$(c) + "  total 1000"
+conm d$, 7
+d$ = "total number of words in lines:" + STR$(d)
+conm d$, 7
+GOTO 5
+
+CASE "lnput"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+e = mitus
+IF e < 4 THEN e = 4
+FOR d = 4 TO e
+    puts b, c + d - 4, sona$(d)
+NEXT d
+GOTO 5
+
+CASE "lnlist"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+
+FOR d = b TO 1000
+    IF c = 0 THEN GOTO 5
+    IF buflu(d) > 0 THEN
+        e$ = cnum(d) + ":"
+        e$ = e$ + SPACE$(5 - LEN(e$))
+        e$ = e$ + cnum(buflu(d))
+        e$ = e$ + SPACE$(8 - LEN(e$))
+
+        FOR g = 1 TO 10
+            gets d, g, f$
+            e$ = e$ + " >" + f$
+        NEXT g
+        conm e$, 7
+        c = c - 1
+    END IF
+NEXT d
+GOTO 5
+
+CASE "fstat"
+title "Memory files summary"
+FOR b = 1 TO 30
+    e = 0
+    FOR c = 1 TO 1000
+        IF buff(b, c) > -1 THEN
+            IF e = 0 THEN
+                d$ = "File number:" + STR$(b)
+                conm d$, 7
+                e = e + 1
+            END IF
+            d$ = "on line:" + STR$(c) + "  allocated memory line: " + STR$(buff(b, c))
+            conm d$, 7
+        END IF
+    NEXT c
+NEXT b
+GOTO 5
+
+CASE "fput"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+d = VAL(sona$(4))
+f = mitus
+IF f < 5 THEN f = 5
+FOR e = 5 TO f
+    putfs b, c, d + e - 5, sona$(e)
+NEXT e
+GOTO 5
+
+CASE "cls"
+FOR b = 1 TO 50
+    conm " ", 7
+NEXT b
+GOTO 5
+
+CASE "fload"
+b = VAL(sona$(3))
+c = VAL(sona$(4))
+d = VAL(sona$(5))
+IF b = 0 THEN b = 1
+IF c = 0 THEN c = 1
+IF d = 0 THEN d = 1
+fload sona$(2), b, c, d
+GOTO 5
+
+CASE "stclear"
+b = VAL(sona$(2))
+IF b = 0 THEN b = 1
+stackl(b) = 0
+GOTO 5
+
+CASE "chklin"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+d = VAL(sona$(4))
+IF b = 0 THEN b = 1
+IF c = 0 THEN c = 1
+IF d = 0 THEN d = 1000
+
+FOR e = c TO d
+    IF buff(b, e) > 0 THEN std cnum(buff(b, e))
+NEXT e
+GOTO 5
+
+CASE "stacksize"
+b = VAL(sona$(2))
+IF b = 0 THEN b = 1
+std cnum(stackl(b))
+GOTO 5
+
+CASE "b"
+boss
+conm "returning", 7
+GOTO 5
+
+CASE "filtor"
+b = VAL(sona$(2))
+FOR e = 1 TO stackl(b)
+    FOR c = 3 TO mitus STEP 2
+        gets stack(e, b), VAL(sona$(c)), f$
+        cmp f$, sona$(c + 1), d
+        IF d = 1 THEN
+            std cnum(stack(e, b))
+        GOTO 20
+        END IF
+    NEXT c
+20
+NEXT e
+GOTO 5
+
+CASE "disp"
+b = VAL(sona$(2))
+DIM tmp1(1 TO 100)
+DIM tmp2(1 TO 100)
+
+FOR d = 1 TO 100
+    tmp2(d) = 0
+NEXT d
+d = 0
+
+FOR e = 3 TO mitus
+    d = d + 1
+    tmp1(d) = VAL(sona$(e))
+NEXT e
+
+FOR c = 1 TO stackl(b)
+    FOR e = 1 TO d
+        gets stack(c, b), tmp1(e), f$
+        IF tmp2(e) < LEN(f$) THEN tmp2(e) = LEN(f$)
+    NEXT e
+NEXT c
+
+FOR c = 1 TO stackl(b)
+    g$ = ""
+    FOR e = 1 TO d
+        gets stack(c, b), tmp1(e), f$
+        f$ = f$ + SPACE$(tmp2(e) - LEN(f$))
+        g$ = g$ + f$ + " # "
+    NEXT e
+    conm g$, 10
+NEXT c
+
+ERASE tmp2
+ERASE tmp1
+GOTO 5
+
+CASE "filtand"
+b = VAL(sona$(2))
+FOR e = 1 TO stackl(b)
+    FOR c = 3 TO mitus STEP 2
+        gets stack(e, b), VAL(sona$(c)), f$
+        cmp f$, sona$(c + 1), d
+        IF d = 0 THEN GOTO 21
+    NEXT c
+    std cnum(stack(e, b))
+21
+NEXT e
+GOTO 5
+
+CASE "sort"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+sort b, c
+GOTO 5
+
+CASE "swap"
+b = VAL(sona$(2))
+c = stackl(b)
+FOR d = 1 TO c / 2
+    SWAP stack(d, b), stack(c - d + 1, b)
+NEXT d
+GOTO 5
+
+CASE "ssort"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+IF b = 0 THEN b = 1
+IF c = 0 THEN c = 1
+ssort b, c
+GOTO 5
+
+CASE "memget"
+b = VAL(sona$(2))
+IF b = 0 THEN b = 1
+FOR c = 1 TO 5000
+IF bufu(c) = 0 THEN bufu(c) = 1: buf$(c) = "-": stack(b, 10) = c: GOTO 23
+NEXT c
+23
+IF stackl(10) < b THEN stackl(10) = b
+GOTO 5
+
+CASE "liststack"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+d = VAL(sona$(4))
+IF b = 0 THEN b = 1
+IF c = 0 THEN c = 1
+IF d = 0 THEN d = stackl(b)
+FOR e = c TO d
+    std cnum(stack(e, b))
+NEXT e
+GOTO 5
+
+CASE "ask"
+b$ = sona$(2)
+IF b$ = "" THEN b$ = "input"
+c = VAL(sona$(3))
+d = VAL(sona$(4))
+e = VAL(sona$(5))
+box 5, 5, 75, 11
+LOCATE 7, 7
+PRINT b$
+LOCATE 9, 7
+INPUT "", f$
+putfs c, d, e, f$
+conm "'" + f$ + "' accepted", 7
+GOTO 5
+
+CASE "flnget"
+b = VAL(sona$(2))
+c = VAL(sona$(3))
+FOR d = 1 TO 1000
+    IF buff(b, d) = -1 THEN
+        stack(c, 10) = d
+        IF stackl(10) < c THEN stackl(10) = c
+        GOTO 24
+    END IF
+NEXT d
+24
+GOTO 5
+
+END SELECT
+
+conm "Invalid command", 12
+5
+END SUB
+
+SUB cmp (a$, b$, r%)
+IF a$ = b$ THEN r% = 1 ELSE r% = 0
+END SUB
+
+FUNCTION cnum$ (a)
+b$ = STR$(a)
+cnum$ = RIGHT$(b$, LEN(b$) - 1)
+END FUNCTION
+
+SUB conkey (a$)
+b$ = concmd$ + SPACE$(85)
+b$ = LEFT$(b$, 80)
+
+IF a$ = "va" THEN conx = conx - 1
+IF a$ = "pa" THEN conx = conx + 1
+IF a$ = "ul" THEN
+    b$ = hist$(histk)
+    histk = histk - 1
+    IF histk < 1 THEN histk = 20
+END IF
+IF a$ = "al" THEN
+    b$ = hist$(histk)
+    histk = histk + 1
+    IF histk > 20 THEN histk = 1
+END IF
+
+IF LEN(a$) = 1 THEN
+    IF a$ = CHR$(13) THEN
+        strip b$, c$
+        histp = histp + 1
+        IF histp > 20 THEN histp = 1
+        histk = histp
+        hist$(histp) = c$
+        cmd c$
+        b$ = ""
+        conx = 1
+        GOTO 4
+    END IF
+
+    IF a$ = CHR$(8) THEN
+        IF conx > 1 THEN
+            b$ = LEFT$(b$, conx - 2) + RIGHT$(b$, 81 - conx)
+            conx = conx - 1
+        END IF
+        GOTO 4
+    END IF
+
+    b$ = LEFT$(b$, conx - 1) + a$ + RIGHT$(b$, 81 - conx)
+    conx = conx + 1
+END IF
+4
+
+IF conx < 1 THEN conx = 1
+IF conx > 80 THEN conx = 80
+
+b$ = b$ + SPACE$(85)
+concmd$ = LEFT$(b$, 80)
+LOCATE 50, 1
+COLOR 15, 1
+PRINT concmd$;
+LOCATE 50, conx
+COLOR 0, 14
+PRINT RIGHT$(LEFT$(concmd$, conx), 1);
+
+
+END SUB
+
+SUB conm (d$, c)
+a$ = d$
+
+14
+IF LEN(a$) > 78 THEN
+    b$ = LEFT$(a$, 78)
+    conm b$, c
+    a$ = "      >> " + RIGHT$(a$, LEN(a$) - 78)
+    GOTO 14
+END IF
+
+b$ = a$ + SPACE$(80 - LEN(a$))
+con$(50) = b$
+conc(50) = c
+
+FOR a = 1 TO 49
+    con$(a) = con$(a + 1)
+    conc(a) = conc(a + 1)
+NEXT a
+
+FOR a = 1 TO 49
+    LOCATE a, 1
+    COLOR conc(a), 0
+    PRINT con$(a)
+NEXT a
+
+END SUB
+
+SUB fload (a$, b, c, d)
+getfil h
+
+j = c
+l = 0
+
+OPEN a$ FOR INPUT AS #h
+12
+IF EOF(h) <> 0 THEN GOTO 13
+LINE INPUT #h, e$
+
+IF LEFT$(e$, 3) = "// " THEN
+    conm e$, 10
+    GOTO 12
+END IF
+IF e$ = SPACE$(LEN(e$)) THEN GOTO 12
+
+e$ = e$ + "|"
+l = l + 1
+h$ = ""
+i = d
+FOR f = 1 TO LEN(e$)
+    g$ = RIGHT$(LEFT$(e$, f), 1)
+    IF g$ = "|" THEN
+        putfs b, j, i, h$
+        h$ = ""
+        g$ = ""
+        i = i + 1
+    END IF
+    IF g$ = CHR$(9) THEN g$ = ""
+    h$ = h$ + g$
+NEXT f
+
+j = j + 1
+GOTO 12
+13
+CLOSE #h
+
+opf(h) = 0
+
+k$ = "file: " + a$ + "  loaded." + STR$(l) + " lines in file"
+conm k$, 7
+END SUB
+
+SUB getfil (a)
+FOR b = 1 TO 30
+    IF opf(b) = 0 THEN
+        opf(b) = 1
+        a = b
+        GOTO 7
+    END IF
+NEXT b
+7
+END SUB
+
+SUB gets (l, s, a$)
+
+b = bufl(l, s)
+
+IF b = -1 THEN
+    a$ = ""
+ELSE
+    a$ = buf$(b)
+END IF
+
+END SUB
+
+SUB mkson (a$)
+
+mitus = 0
+
+d = 1
+FOR b = 1 TO LEN(a$)
+    c$ = RIGHT$(LEFT$(a$, b), 1)
+    IF c$ = " " THEN
+        d = 1
+    ELSE
+        IF d = 1 THEN
+            mitus = mitus + 1
+            sona$(mitus) = ""
+            d = 0
+        END IF
+        sona$(mitus) = sona$(mitus) + c$
+    END IF
+NEXT b
+
+'conm "sonad_______", 10
+'FOR b = 1 TO mitus
+'conm sona$(b), 14
+'NEXT b
+
+FOR a = 1 TO mitus
+    IF LEFT$(sona$(a), 2) = "|>" THEN
+        IF sona$(a + 1) = "c" THEN stdl = 1
+        IF sona$(a + 1) = "s" THEN stdl = 10 + VAL(sona$(a + 2))
+        mitus = a - 1
+        GOTO 15
+    END IF
+    IF LEFT$(sona$(a), 2) = "|@" THEN
+        sona$(a) = cnum(stack(VAL(RIGHT$(sona$(a), LEN(sona$(a)) - 2)), 10))
+    END IF
+NEXT a
+
+15
+FOR a = mitus + 1 TO 20
+    sona$(a) = ""
+NEXT a
+
+END SUB
+
+SUB putfs (f, l, s, c$)
+
+'DIM SHARED buff(1 TO 30, 1 TO 1000)
+
+la = buff(f, l)
+
+IF la = -1 THEN
+    FOR a = 1 TO 1000
+        IF buflu(a) = 0 THEN
+            la = a
+            GOTO 10
+        END IF
+    NEXT a
+10
+END IF
+
+puts la, s, c$
+IF buflu(la) = 0 THEN
+    buff(f, l) = -1
+ELSE
+    buff(f, l) = la
+END IF
+END SUB
+
+SUB puts (l, s, a$)
+'PRINT l, s
+IF a$ = "|" THEN a$ = ""
+IF a$ = "||" THEN GOTO 11
+'conm a$, 13
+b = bufl(l, s)
+
+IF b = -1 THEN
+    FOR c = 1 TO 10000
+        IF bufu(c) = 0 THEN
+            GOTO 6
+        END IF
+    NEXT c
+6
+    b = c
+    bufu(b) = 1
+    buflu(l) = buflu(l) + 1
+END IF
+
+strip a$, c$
+
+IF c$ = "" THEN
+    bufu(b) = 0
+    buf$(b) = ""
+    bufl(l, s) = -1
+    buflu(l) = buflu(l) - 1
+ELSE
+    buf$(b) = c$
+    bufl(l, s) = b
+END IF
+11
+
+END SUB
+
+SUB runf (a$)
+getfil h
+
+OPEN a$ FOR INPUT AS #h
+9
+IF EOF(h) <> 0 THEN GOTO 8
+LINE INPUT #h, b$
+cmd b$
+GOTO 9
+8
+CLOSE #h
+
+opf(h) = 0
+
+END SUB
+
+SUB sort (s, w)
+DIM tmp1(1 TO 10000)
+DIM tmp2(1 TO 10000)
+
+b = stackl(s)
+
+FOR a = 1 TO b
+    gets stack(a, s), w, c$
+    tmp1(a) = VAL(c$)
+    tmp2(a) = a
+NEXT a
+
+d = 1
+FOR a = 1 TO b
+    e = 32000
+
+    FOR c = d TO b
+        IF tmp1(c) < e THEN
+            e = tmp1(c)
+            f = c
+        END IF
+    NEXT c
+    SWAP tmp1(a), tmp1(f)
+    SWAP tmp2(a), tmp2(f)
+    d = d + 1
+NEXT a
+
+FOR a = 1 TO b
+    stack(a, s) = tmp2(a)
+NEXT a
+
+END SUB
+
+SUB ssort (s, m)
+DIM tbti(1 TO 2000)
+DIM tbtp(1 TO 2000)
+DIM tbt$(1 TO 2000)
+
+FOR a = 1 TO stackl(s)
+    gets stack(a, s), m, b$
+    tbt$(a) = b$
+    tbtp(a) = a
+NEXT a
+
+b = stackl(s)
+FOR a = 1 TO stackl(s)
+d$ = tbt$(1)
+e = 1
+f = ASC(LEFT$(d$, 1))
+FOR c = 2 TO b
+IF ASC(LEFT$(tbt$(c), 1)) = f THEN
+IF d$ <> tbt$(c) THEN
+g$ = d$ + CHR$(0)
+h$ = tbt$(c) + CHR$(0)
+i = LEN(g$)
+IF LEN(h$) > i THEN i = LEN(h$)
+FOR j = 1 TO i
+k = ASC(RIGHT$(LEFT$(g$, j), 1))
+l = ASC(RIGHT$(LEFT$(h$, j), 1))
+IF k < l THEN GOTO 22
+IF l < k THEN e = c: d$ = tbt$(c): f = ASC(LEFT$(d$, 1)): GOTO 22
+NEXT j
+END IF
+END IF
+IF ASC(LEFT$(tbt$(c), 1)) < f THEN f = ASC(LEFT$(tbt$(c), 1)): e = c: d$ = tbt$(c)
+22
+NEXT c
+
+    tbti(a) = tbtp(e)
+    tbt$(e) = tbt$(b)
+    tbtp(e) = tbtp(b)
+    b = b - 1
+NEXT a
+
+FOR a = 1 TO stackl(s)
+    stack(a, s) = tbti(a)
+NEXT a
+
+conm "done", 7
+
+END SUB
+
+SUB start
+WIDTH 80, 50
+VIEW PRINT 1 TO 50
+CLS
+conx = 1
+histp = 1
+histk = 1
+stdl = 1
+
+conm "DDBASE, (Dos Data BASE) 0.0", 7
+conm "Copyright Svjatoslav Agejenko. All Rights Reserved.", 7
+conm "starting...", 7
+FOR a = 1 TO 5000
+    bufu(a) = 0
+    buf$(a) = ""
+NEXT a
+
+FOR a = 1 TO 30
+    FOR b = 1 TO 1000
+        bufl(b, a) = -1
+        buff(a, b) = -1
+    NEXT b
+    opf(a) = 0
+NEXT a
+
+FOR a = 1 TO 1000
+    buflu(a) = 0
+NEXT a
+
+FOR a = 1 TO 10
+    stackl(a) = 0
+NEXT a
+
+a$ = "runf auto.scr"
+FOR b = 1 TO LEN(a$)
+    c$ = RIGHT$(LEFT$(a$, b), 1)
+    conkey c$
+NEXT b
+conkey CHR$(13)
+
+END SUB
+
+SUB std (a$)
+'conm a$, 2
+
+SELECT CASE stdl
+CASE 1
+    conm a$, 10
+CASE 11 TO 20
+    b = stdl - 10
+    stackl(b) = stackl(b) + 1
+    stack(stackl(b), b) = VAL(a$)
+
+    c$ = a$ + " > " + cnum(stackl(b)) + " ! " + cnum(b)
+END SELECT
+
+END SUB
+
+SUB strip (a$, b$)
+b$ = a$
+2
+IF LEFT$(b$, 1) = " " THEN
+    b$ = RIGHT$(b$, LEN(b$) - 1)
+    GOTO 2
+END IF
+3
+IF RIGHT$(b$, 1) = " " THEN
+    b$ = LEFT$(b$, LEN(b$) - 1)
+    GOTO 3
+END IF
+
+END SUB
+
+SUB title (a$)
+conm " ", 10
+conm "================> " + a$ + " <===============", 7
+
+END SUB
diff --git a/Miscellaneous/Database/lisa.scr b/Miscellaneous/Database/lisa.scr
new file mode 100644
index 0000000..30e4900
--- /dev/null
+++ b/Miscellaneous/Database/lisa.scr
@@ -0,0 +1,11 @@
+flnget 1 1
+ask Eesnimi 1 |@1 1
+ask Perekonnanimi 1 |@1 2
+ask Aadress 1 |@1 3
+ask Telefon 1 |@1 4
+ask Sugu_M_voi_N 1 |@1 5
+ask Snniaasta 1 |@1 7
+stclear 1
+chklin 1 |> s 1
+stacksize 1 |> c
+
diff --git a/Miscellaneous/Mouse driver/index.html b/Miscellaneous/Mouse driver/index.html
new file mode 100644
index 0000000..25a8c73
--- /dev/null
+++ b/Miscellaneous/Mouse driver/index.html	
@@ -0,0 +1,16 @@
+<HTML>
+<HEAD><TITLE>QBasic mouse extension</TITLE></HEAD>
+
+<BODY>
+<CENTER><H1>QBasic mouse extension</H1></CENTER>
+<BR>
+<BR>
+
+This TSR written in x86 assembler, allows QBasic programs to use mouse,
+by writing mouse movement and button press info to memory,
+referenced by INT 79h.
+Afterwards QBasic programs can read mouse cursor position
+directly from RAM by using PEEK command.
+
+</BODY>
+</HTML>
\ No newline at end of file
diff --git a/Miscellaneous/Mouse driver/mousedrv.bas b/Miscellaneous/Mouse driver/mousedrv.bas
new file mode 100755
index 0000000..92d177c
--- /dev/null
+++ b/Miscellaneous/Mouse driver/mousedrv.bas	
@@ -0,0 +1,146 @@
+' QBasic does not have mouse support. Here is demonstration of custom mouse driver.
+' In order to use mouse, special custom TSR (Terminate and Stay Resident) mouse driver
+' has to be loaded before running this demo.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2004.01, Initial version
+
+DECLARE SUB mousedemo ()
+DECLARE SUB putword (addr!, dat!)
+DECLARE FUNCTION getword! (addr!)
+DECLARE FUNCTION getbyte! (addr!)
+DECLARE SUB start ()
+
+DIM SHARED extSEG, extADDR
+
+start
+
+mousedemo
+
+FUNCTION getbyte (addr)
+    ' This function retrieves a byte from the specified address.
+    getbyte = PEEK(extADDR + addr)
+END FUNCTION
+
+FUNCTION getword (addr)
+    ' This function retrieves a word (2 bytes) from the specified address.
+    a = PEEK(extADDR + addr)
+    b = PEEK(extADDR + addr + 1)
+
+    c$ = HEX$(a)
+    IF LEN(c$) = 1 THEN c$ = "0" + c$
+    IF LEN(c$) = 0 THEN c$ = "00"
+
+    ' Combine the two bytes into a single word.
+    c = VAL("&H" + HEX$(b) + c$)
+
+    getword = c
+END FUNCTION
+
+SUB mousedemo
+    ' This subroutine demonstrates mouse movement and button clicks.
+
+    cx = 150
+    cy = 100
+    maxmove = 50
+
+    1
+    frm = frm + 1
+
+    ' Check for user input on keyboard and exit if any key is pressed
+    IF INKEY$ <> "" THEN SYSTEM
+
+    ' Print the current coordinates and frame number.
+    LOCATE 1, 1
+    PRINT cx, cy
+    PRINT frm
+
+    ' Draw a circle at the current mouse position.
+    CIRCLE (cx, cy), 10, 0
+
+    ' Retrieve the x and y movement values from the mouse.
+    xp = getword(2)
+    putword 2, 0
+    yp = getword(4)
+    putword 4, 0
+
+    ' Retrieve the button status from the mouse.
+    butt = getword(6)
+    putword 6, 0
+
+    ' Print the button status if a button is pressed.
+    IF butt <> 0 THEN
+        LOCATE 5
+        PRINT butt
+    END IF
+
+    ' Limit the mouse movement to within maxmove.
+    IF xp < -maxmove THEN xp = -maxmove
+    IF xp > maxmove THEN xp = maxmove
+    cx = cx + xp
+
+    IF yp < -maxmove THEN yp = -maxmove
+    IF yp > maxmove THEN yp = maxmove
+    cy = cy + yp
+
+    ' Draw a circle at the new mouse position.
+    CIRCLE (cx, cy), 10, 10
+
+    ' Use sound command for adding short delay
+    SOUND 0, .05
+
+    ' Repeat the loop to continuously update the mouse position.
+    GOTO 1
+
+END SUB
+
+SUB putword (addr, dat)
+    ' This subroutine stores a word (2 bytes) at the specified address.
+
+    b$ = HEX$(dat)
+
+    2
+    IF LEN(b$) < 4 THEN b$ = "0" + b$: GOTO 2
+
+    ' Split the word into two bytes.
+    n1 = VAL("&H" + LEFT$(b$, 2))
+    n2 = VAL("&H" + RIGHT$(b$, 2))
+
+    ' Store the bytes at the specified address.
+    POKE (extADDR + addr), n2
+    POKE (extADDR + addr + 1), n1
+
+END SUB
+
+SUB start
+    ' This subroutine initializes the screen and retrieves the segment and address of the mouse driver.
+
+    SCREEN 13
+
+    DEF SEG = 0     ' read first from interrupt table
+
+    extSEG = PEEK(&H79 * 4 + 3) * 256
+    extSEG = extSEG + PEEK(&H79 * 4 + 2)
+
+    PRINT "Segment is: " + HEX$(extSEG)
+
+    extADDR = PEEK(&H79 * 4 + 1) * 256
+    extADDR = extADDR + PEEK(&H79 * 4 + 0)
+
+    PRINT "relative address is:"; extADDR
+
+    DEF SEG = extSEG
+
+    ' Check if the mouse driver is loaded.
+    IF getword(0) <> 1983 THEN
+        PRINT "FATAL ERROR: you must load"
+        PRINT "QBasic extension TSR first!"
+        SYSTEM
+    END IF
+
+END SUB
\ No newline at end of file
diff --git a/Miscellaneous/Mouse driver/qbext.asm b/Miscellaneous/Mouse driver/qbext.asm
new file mode 100644
index 0000000..57dd874
--- /dev/null
+++ b/Miscellaneous/Mouse driver/qbext.asm	
@@ -0,0 +1,84 @@
+; TSR hack that allows QBasic programs to use mouse.
+; Made by Svjatoslav Agejenko
+; in 2004.01
+; Homepage: http://svjatoslav.eu
+ 
+
+org 100h
+
+myint = 79h     ; interrupt to hook, becomes pointer to data table
+
+
+	mov	dx, msg
+	mov	ah, 9
+	int	21h
+
+        mov     ax, 0           ; Saves old interrupt vector
+        mov     es, ax
+        mov     eax, [es:32]
+        mov     [oldVector], eax 
+
+        cli
+        mov     ax, cs          ; Set new interrupt vector for IRQ 0
+        shl     eax, 16
+        mov     ax, custom
+        mov     [es:32], eax
+        mov     ax, dataTable   ; Set interrupt vector for INT 79 (default)
+        mov     [es:4 * myint], eax
+        sti
+
+        mov     ax, endPointer  ; Calculate needed memory size, become TSR
+        add     ax, 32
+        mov     dx, 0
+        mov     bx, 16
+        div     bx
+        mov     dx, ax
+        mov     ax, 3100h
+        int     21h
+
+custom:
+        pushf                   ; Execute default code in old int vector
+        call    dword [cs:oldVector]
+
+        cmp     [cs:isRunning], 0 ; Check if custom routine is already active
+        jne     EndOfRoutine
+
+        mov     [cs:isRunning], 1 ; Set active flag
+        pusha
+        push    ds
+        push    es
+
+       	cli 
+        mov     ax, 0bh         ; Read Mouse Motion Counters
+        int     33h
+        add     [CS:mouseHorisontal], cx
+        add     [CS:mouseVertical], dx
+        mov     ax, 3           ; read mouse buttons
+	int	33h
+        or      [CS:mouseButtons], bx
+	inc	byte [CS:updated]
+	sti
+
+        pop     es
+        pop     ds
+        popa
+        mov     [cs:isRunning], 0 ; Terminate active flag
+        EndOfRoutine:
+        iret
+
+oldVector       dd 0
+isRunning	db 0
+
+dataTable:
+	dw 1983			; check number, indicates that module is loaded
+        mouseHorisontal dw 0
+        mouseVertical   dw 0
+        mouseButtons    dw 0
+	updated		db 0
+	
+
+endPointer:
+	
+msg:
+file 'readme.txt'
+	db '$'
diff --git a/Miscellaneous/Mouse driver/qbext.com b/Miscellaneous/Mouse driver/qbext.com
new file mode 100755
index 0000000..ae54fc4
Binary files /dev/null and b/Miscellaneous/Mouse driver/qbext.com differ
diff --git a/Miscellaneous/Password lock/passw.bas b/Miscellaneous/Password lock/passw.bas
new file mode 100644
index 0000000..b47b4b7
--- /dev/null
+++ b/Miscellaneous/Password lock/passw.bas	
@@ -0,0 +1,252 @@
+' Program tries to render fancy rocket control system with password protection.
+' When entered password is wrong, program will halt in 3 attempts.
+' When password is correct, program will exit and return control to the user.
+' Password is stored in "passw.dat" file.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version.
+' 2024, Improved program readability.
+
+
+DECLARE SUB checkPassword (a$)
+DECLARE SUB startProgram ()
+DECLARE SUB makeVerticalLines (s%, C%)
+DECLARE SUB drawBox (x1%, y1%, x2%, y2%)
+
+DIM SHARED cha
+DIM SHARED password$
+
+startProgram
+
+' Initialize variables
+x = 25
+x2 = 10
+x3 = 0
+B$ = ""
+
+1
+' Update position of the bouncing ball
+x = x + xs
+IF x > 0 THEN
+    ' Decrease speed if ball is moving right
+    xs = xs - .5
+ELSE
+    ' Increase speed if ball is moving left
+    xs = xs + .5
+END IF
+' Gradually decrease the speed
+xs = xs - (xs / 8)
+
+' Draw a vertical line and a dot
+IF x2 > 100 THEN
+    ' Reset the position of the line
+    x2 = 10
+ELSE
+    LINE (x2, 10)-(x2, 60), 0
+    PSET (x2, x + 35), 10
+END IF
+' Draw another vertical line next to the first one
+IF x2 < 99 THEN
+    LINE (x2 + 1, 10)-(x2 + 1, 60), 3
+END IF
+
+' Update position of the lines
+x2 = x2 + 1
+x3 = x3 + 1
+
+' Play a sound when the ball hits the right edge
+IF x3 > 40 THEN
+    x3 = 0
+    xs = xs - 5
+    SOUND 1000, 1
+END IF
+
+SOUND 0, .5
+
+a$ = INKEY$
+' Check if the Enter key is pressed
+IF a$ = CHR$(13) THEN
+    ' Validate the entered password
+    checkPassword B$
+    ' Clear the input buffer
+    B$ = ""
+    GOTO 2
+END IF
+
+' Check if any other key is pressed
+IF a$ <> "" THEN
+    ' Handle backspace
+    IF a$ = CHR$(8) THEN
+        ' Remove the last character from the input buffer
+        IF LEN(B$) > 0 THEN
+            B$ = LEFT$(B$, LEN(B$) - 1)
+        END IF
+        GOTO 2
+    END IF
+    ' Add the pressed key to the input buffer
+    B$ = B$ + a$
+    ' Limit the length of the input buffer
+    IF LEN(B$) > 10 THEN
+        B$ = LEFT$(B$, 10)
+    END IF
+2
+    ' Draw the characters in the input buffer
+    FOR a = 1 TO 10
+        ' Determine the color of the character
+        IF a <= LEN(B$) THEN
+            C = 5
+        ELSE
+            C = 1
+        END IF
+        ' Draw the character
+        CIRCLE (a * 15 + 20, 150), 6, C
+        PAINT (a * 15 + 20, 150), C
+    NEXT a
+END IF
+
+GOTO 1
+
+SUB checkPassword (a$)
+    cha = cha - 1
+
+    ' Check if the entered password is correct
+    IF a$ = password$ THEN
+        CLS
+        SCREEN 2
+        SYSTEM
+    END IF
+
+    ' Draw the background of the error message box
+    DIM buf(1 TO 3000)
+    GET (79, 80)-(241, 141), buf(1)
+
+    ' Draw the borders of the error message box
+    drawBox 80, 90, 240, 140
+
+    ' Display the error message
+    LOCATE 14, 14
+    COLOR 12
+    PRINT "Wrong password"
+
+    ' Display the number of remaining attempts
+    COLOR 5
+    LOCATE 16, 13
+    PRINT STR$(cha) + " chances left"
+
+    ' Play a sound to indicate an error
+    FOR a = 1 TO 30
+        SOUND 0, 1
+    NEXT a
+
+    ' Display the final message when all attempts are exhausted
+    IF cha = 0 THEN
+        DIM buf2(1000)
+        GET (79, 138)-(241, 140), buf2
+        FOR a = 1 TO 40
+            PUT (79, 138 + a), buf2, PSET
+            SOUND 0, .5
+        NEXT a
+
+        LOCATE 19, 14
+        COLOR 12
+        PRINT "SYSTEM HALTED"
+        LOCATE 21, 14
+        PRINT "SUCCESSFULLY!!"
+3
+        GOTO 3
+    END IF
+
+    ' Restore the background of the error message box
+    PUT (79, 80), buf(1), PSET
+END SUB
+
+DEFINT A-Z
+SUB drawBox (x1%, y1%, x2%, y2%)
+    ' Draw the top border of the box
+    LINE (x1 + 1, y1 + 1)-(x2 - 1, y2 - 1), 0, BF
+    ' Draw the bottom border of the box
+    LINE (x1, y1)-(x2, y2), 10, B
+    ' Draw the left and right borders of the box
+    LINE (x1, y1)-(x2, y1 - 9), 14, BF
+    LINE (x1, y1)-(x2, y1 - 9), 10, B
+
+    ' Draw the top left corner of the box
+    LINE (x2 - 2, y1 - 2)-(x2 - 7, y1 - 7), 7, BF
+    ' Draw the top right corner of the box
+    LINE (x2 - 9, y1 - 2)-(x2 - 14, y1 - 7), 7, BF
+
+    ' Draw the diagonal lines in the top left corner
+    LINE (x2 - 2, y1 - 2)-(x2 - 7, y1 - 7), 0
+    LINE (x2 - 2, y1 - 7)-(x2 - 7, y1 - 2), 0
+
+    ' Draw the horizontal line in the top left corner
+    LINE (x2 - 10, y1 - 3)-(x2 - 13, y1 - 3), 0
+END SUB
+
+SUB makeVerticalLines (s%, C%)
+    ' Draw vertical lines
+    FOR x = 160 TO 319 STEP s
+        LINE (x, 0)-(x, 199), C
+        LINE (320 - x, 0)-(320 - x, 199), C
+    NEXT x
+
+    ' Draw horizontal lines
+    FOR y = 100 TO 199 STEP s
+        LINE (0, y)-(319, y), C
+        LINE (0, 200 - y)-(319, 200 - y), C
+    NEXT y
+END SUB
+
+DEFSNG A-Z
+SUB startProgram
+    ' Read the password from the file
+    OPEN "passw.dat" FOR INPUT AS #1
+    LINE INPUT #1, password$
+    CLOSE #1
+
+    ' Set the screen mode
+    SCREEN 13
+
+    ' Initialize the number of remaining attempts
+    cha = 3
+
+    ' Draw vertical lines with increasing spacing
+    s = 2
+    FOR C = 16 TO 31
+        s = s * 1.4
+        makeVerticalLines INT(s), INT(C)
+    NEXT C
+    makeVerticalLines INT(s), 0
+
+    ' Draw the main box
+    drawBox 70, 20, 270, 90
+
+    ' Display the initial message
+    COLOR 5
+    LOCATE 8, 10
+    PRINT "           stack dump:"
+    LOCATE 9, 10
+    PRINT "010010010010010010010100"
+
+    ' Display the running message
+    LOCATE 10, 10
+    PRINT "Running rocket ground"
+    LOCATE 11, 10
+    PRINT "control system..."
+
+    ' Draw the input box
+    drawBox 9, 9, 101, 61
+
+    ' Draw the password input box
+    drawBox 20, 130, 300, 190
+
+    ' Display the password prompt
+    LOCATE 18, 5
+    PRINT "ENTER PASSWORD:"
+END SUB
+
diff --git a/Miscellaneous/Password lock/passw.dat b/Miscellaneous/Password lock/passw.dat
new file mode 100644
index 0000000..6ea1900
--- /dev/null
+++ b/Miscellaneous/Password lock/passw.dat	
@@ -0,0 +1 @@
+jerry
\ No newline at end of file
diff --git a/Miscellaneous/Password lock/screenshot, 1.png b/Miscellaneous/Password lock/screenshot, 1.png
new file mode 100644
index 0000000..bada664
Binary files /dev/null and b/Miscellaneous/Password lock/screenshot, 1.png differ
diff --git a/Miscellaneous/Password lock/screenshot, 2.png b/Miscellaneous/Password lock/screenshot, 2.png
new file mode 100644
index 0000000..c5183c9
Binary files /dev/null and b/Miscellaneous/Password lock/screenshot, 2.png differ
diff --git a/Miscellaneous/Pressed key test.bas b/Miscellaneous/Pressed key test.bas
new file mode 100644
index 0000000..d4d8af3
--- /dev/null
+++ b/Miscellaneous/Pressed key test.bas	
@@ -0,0 +1,26 @@
+' Utility to print information about pressed keyboard buttons.
+'
+
+MainLoop:
+    ' Wait for a key press and store it in userInput$
+    userInput$ = INKEY$
+
+    ' If no key has been pressed, jump back to the main loop
+    IF userInput$ = "" THEN GOTO MainLoop
+
+    ' Print the character that was typed by the user
+    PRINT "You typed: "; userInput$
+
+    ' Calculate the ASCII value of the first character (if input is more than one character)
+    ' and print it
+    IF LEN(userInput$) > 0 THEN
+        PRINT "ASCII value of the first character ('"; LEFT$(userInput$, 1); "'): "; ASC(LEFT$(userInput$, 1))
+    END IF
+
+    ' Calculate the ASCII value of the last character and print it
+    IF LEN(userInput$) > 0 THEN
+        PRINT "ASCII value of the last character ('"; RIGHT$(userInput$, 1); "'): "; ASC(RIGHT$(userInput$, 1))
+    END IF
+
+    ' Jump back to the main loop to wait for another key press
+    GOTO MainLoop
\ No newline at end of file
diff --git a/Miscellaneous/Video modes detector.bas b/Miscellaneous/Video modes detector.bas
new file mode 100644
index 0000000..9602423
--- /dev/null
+++ b/Miscellaneous/Video modes detector.bas	
@@ -0,0 +1,54 @@
+' Utility to determine available video modes.
+'
+' Written by Svjatoslav Agejenko
+' Homepage: svjatoslav.eu
+' Email:    svjatoslav@svjatoslav.eu
+
+' 2001, initial version
+' 2024.08, used AI to enhance program readability
+
+DIM SHARED AvailableModes(1 TO 100) AS INTEGER
+ON ERROR GOTO ErrorHandler
+
+' Initialize the video mode counter and the current mode number.
+currentModeIndex = 1
+currentModeNumber = 0
+
+' Start the loop to test each video mode.
+DO
+    ' Attempt to set the screen to the current video mode.
+    SCREEN currentModeNumber
+
+    ' Increment the mode number for the next iteration.
+    currentModeNumber = currentModeNumber + 1
+
+    ' Store the successful video mode in the array.
+    AvailableModes(currentModeIndex) = currentModeNumber - 1
+
+    ' Move to the next index in the array.
+    currentModeIndex = currentModeIndex + 1
+
+LOOP
+
+' Error handling routine when an error occurs (e.g., invalid video mode).
+ErrorHandler:
+' Increment the mode number to continue testing after an error.
+currentModeNumber = currentModeNumber + 1
+
+' Check if we have reached the maximum number of modes to test.
+IF currentModeNumber > 1000 THEN
+    ' Reset the screen to text mode (usually mode 1).
+    SCREEN 1
+
+    ' Display the list of available video modes.
+    PRINT "Available video modes on this computer:"
+    FOR modeIndex = 1 TO currentModeIndex - 1
+        PRINT AvailableModes(modeIndex)
+    NEXT modeIndex
+
+    ' End the program after displaying the results.
+    END
+END IF
+
+' Resume execution after an error to continue testing modes.
+RESUME
\ No newline at end of file
diff --git a/Miscellaneous/alarm 1.bas b/Miscellaneous/alarm 1.bas
new file mode 100755
index 0000000..5e973a0
--- /dev/null
+++ b/Miscellaneous/alarm 1.bas	
@@ -0,0 +1,57 @@
+' Program to play sound that resembles security alarm.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' ?, Initial version
+' 2024 - 2025, Enhanced program readability
+
+SCREEN 1
+CLS
+
+' Initialize main frequency control variable
+' This will create the oscillating siren effect by increasing/decreasing value
+currentFrequency = 40
+
+StartLoop:
+    ' Play primary oscillating tone (main siren component)
+    ' Frequency sweeps up and down between thresholds
+    SOUND currentFrequency, .3
+
+    ' Add secondary fixed-frequency component (200Hz for 1 duration unit)
+    ' Creates layered audio effect that makes alarm more realistic
+    ' Duration parameter uses QBasic's time units (1 ≈ 0.05 seconds)
+    SOUND 200, 1
+
+    ' Rapidly increase frequency for ascending siren sweep
+    ' Jump amount (100) creates dramatic pitch jumps
+    currentFrequency = currentFrequency + 100
+
+    ' Check if we've exceeded upper frequency threshold (1000Hz)
+    ' If yes, switch to descending phase
+    IF currentFrequency > 1000 THEN GoTo DecreaseFrequency
+
+    ' Repeat ascending sweep until reaching maximum threshold
+    GOTO StartLoop
+
+DecreaseFrequency:
+    ' Continue playing oscillating tone during descending phase
+    SOUND currentFrequency, .3
+
+    ' Add high-pitched pulse (500Hz for short duration)
+    ' Creates distinctive alarm "warble" pattern
+    ' Shorter duration (.2) adds rhythmic pulsing
+    SOUND 500, .2
+
+    ' Gradually decrease frequency for descending sweep
+    ' Smaller decrement (10) creates slower descent than ascent
+    currentFrequency = currentFrequency - 10
+
+    ' Check if we've dropped below lower threshold (200Hz)
+    ' If yes, restart ascending phase to complete siren cycle
+    IF currentFrequency < 200 THEN GoTo StartLoop
+
+    ' Continue descending sweep until reaching minimum threshold
+    GOTO DecreaseFrequency
diff --git a/Miscellaneous/alarm 1.mp3 b/Miscellaneous/alarm 1.mp3
new file mode 100644
index 0000000..eec2000
Binary files /dev/null and b/Miscellaneous/alarm 1.mp3 differ
diff --git a/Miscellaneous/alarm 2.bas b/Miscellaneous/alarm 2.bas
new file mode 100755
index 0000000..87f03c1
--- /dev/null
+++ b/Miscellaneous/alarm 2.bas	
@@ -0,0 +1,34 @@
+' This program generates a security alarm sound effect with two alternating patterns
+
+DEFINT A-Z
+
+' Start of infinite alarm cycle
+1
+
+    ' Pattern 1: Ascending frequency sweep with counterpoint tone
+    ' Increase primary frequency from 100Hz to 1000Hz in steps of 3Hz
+    FOR ascendingFrequency = 100 TO 1000 STEP 3
+        ' Play main ascending tone
+        SOUND ascendingFrequency, .05
+
+        ' Generate counterpoint tone that decreases as primary increases
+        ' Formula creates complementary frequency by subtracting double current frequency
+        ' At 100Hz -> 5000-2*100=4800Hz; At 1000Hz -> 5000-2*1000=3000Hz
+        counterToneFrequency = 5000 - (ascendingFrequency * 2)
+        SOUND counterToneFrequency, .1
+    NEXT ascendingFrequency
+
+    ' Pattern 2: Descending frequency sweep with harmonic enhancement
+    ' Decrease frequency from 1000Hz back to 100Hz in larger steps (-5)
+    FOR descendingFrequency = 1000 TO 100 STEP -5
+        ' Play main descending tone 
+        SOUND descendingFrequency, .05
+
+        ' Add harmonic overtone at triple frequency plus small offset
+        ' Creates richer, more complex sound texture
+        harmonicFrequency = (descendingFrequency * 3) + 10
+        SOUND harmonicFrequency, .05
+    NEXT descendingFrequency
+
+' Continuously repeat between both sound patterns
+GOTO 1
diff --git a/Miscellaneous/alarm 2.mp3 b/Miscellaneous/alarm 2.mp3
new file mode 100644
index 0000000..c00ecf5
Binary files /dev/null and b/Miscellaneous/alarm 2.mp3 differ
diff --git a/Miscellaneous/windowing system.bas b/Miscellaneous/windowing system.bas
new file mode 100755
index 0000000..ff0d067
--- /dev/null
+++ b/Miscellaneous/windowing system.bas	
@@ -0,0 +1,274 @@
+' Text mode windowing system. Each window can display text file.
+' Window content can be scrolled horizontally and vertically.
+' Window can have arbitrary size and location on the screen.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+
+' Changelog:
+' 2003, Initial version
+' 2024-2025, Improved program readability
+
+DECLARE SUB demo ()
+DECLARE FUNCTION GetLineFromWindow$ (windowNum%, lineNum%)
+DECLARE SUB LoadFileIntoWindow (fileName$, windowNum%)
+DECLARE SUB SendLineToWindow (windowNum%, lineNum%, newString$)
+DECLARE FUNCTION GetFreeLineIndex% ()
+DECLARE SUB RefreshAllWindows ()
+DECLARE FUNCTION AddWindow% (x%, y%, widt%, haigh%, title$)
+DECLARE SUB DrawBox (x%, y%, widt%, haigh%, edgeStyle$)
+DEFINT A-Z
+DECLARE SUB ShowWindow (windowNum)
+DECLARE SUB InitializeSystem ()
+
+' Global variables for text storage
+DIM SHARED maxStorage%
+maxStorage% = 5000
+DIM SHARED textStorage$(1 TO maxStorage%)
+DIM SHARED storagePointer%
+
+' Window-related global arrays
+DIM SHARED windowData(1 TO 10, 1 TO 1000)      ' Stores line indices for each window
+DIM SHARED windowX(1 TO 10), windowY(1 TO 10)  ' Position of each window
+DIM SHARED windowWidth(1 TO 10), windowHeight(1 TO 10)  ' Size of each window
+DIM SHARED windowActiveStatus(1 TO 10)         ' Whether window is active
+DIM SHARED windowTitle$(1 TO 10)               ' Title of each window
+
+' Window scrolling/shifting
+DIM SHARED windowShiftX(1 TO 10)      ' Horizontal shift
+DIM SHARED windowShiftY(1 TO 10)      ' Vertical shift
+
+DIM SHARED currentActiveWindow%       ' Currently active window for display
+
+InitializeSystem
+
+demo
+
+FUNCTION AddWindow% (x%, y%, widt%, heigh%, title$)
+    ' Adds a new window to the system
+
+    ' Find an empty window slot
+    FOR windowNum% = 1 TO 10
+        IF windowActiveStatus(windowNum%) = 0 THEN
+            foundWindow% = windowNum%
+            GOTO FoundEmptySlot
+        END IF
+    NEXT windowNum%
+
+FoundEmptySlot:
+    ' Initialize the window properties
+    windowActiveStatus(foundWindow%) = 1
+    windowX(foundWindow%) = x%
+    windowY(foundWindow%) = y%
+    windowWidth(foundWindow%) = widt%
+    windowHeight(foundWindow%) = heigh%
+    windowTitle$(foundWindow%) = title$
+
+    ' Return the window number
+    AddWindow% = foundWindow%
+END FUNCTION
+
+SUB ClearWindowContent (windowNum%)
+    ' Clears all content from a window
+
+    FOR lineNum% = 1 TO 1000
+        IF windowData(windowNum%, lineNum%) > 0 THEN
+            textStorage$(windowData(windowNum%, lineNum%)) = ""
+            windowData(windowNum%, lineNum%) = 0
+        END IF
+    NEXT lineNum%
+END SUB
+
+SUB demo
+    ' Create three windows with different sizes and titles
+    window1% = AddWindow%(1, 1, 30, 10, "window 1.")
+    window2% = AddWindow%(1, 12, 80, 30, "second window")
+    window3% = AddWindow%(31, 2, 30, 10, "last window")
+
+    ' Load the same file into all windows
+    LoadFileIntoWindow "wsystem.bas", window2%
+    LoadFileIntoWindow "wsystem.bas", window1%
+    LoadFileIntoWindow "wsystem.bas", window3%
+
+AnimateWindows:
+    ' Randomly select an active window to animate
+    currentActiveWindow% = INT(RND * 3) + 1
+    RefreshAllWindows
+
+    ' Animate the windows by shifting their content
+    FOR animationFrame% = 1 TO 100
+        windowShiftX(currentActiveWindow%) = SIN(animationFrame% / 10) * 10 + 10
+        windowShiftY(currentActiveWindow%) = animationFrame%
+        ShowWindow currentActiveWindow%
+        ' split-second delay
+        SOUND 0, 1
+        IF INKEY$ <> "" THEN SYSTEM
+    NEXT animationFrame%
+
+    GOTO AnimateWindows
+END SUB
+
+FUNCTION GetFreeLineIndex%
+    ' Finds a free line in text storage
+
+FindNextLine:
+    IF storagePointer% > 1000 THEN
+        storagePointer% = 1
+    END IF
+
+    IF textStorage$(storagePointer%) = "" THEN
+        GetFreeLineIndex% = storagePointer%
+        storagePointer% = storagePointer% + 1
+    ELSE
+        storagePointer% = storagePointer% + 1
+        GOTO FindNextLine
+    END IF
+END FUNCTION
+
+FUNCTION GetLineFromWindow$ (windowNum%, lineNum%)
+    ' Retrieve a line from a window's memory
+
+    IF windowData(windowNum%, lineNum%) = 0 THEN
+        GetLineFromWindow$ = ""
+    ELSE
+        GetLineFromWindow$ = textStorage$(windowData(windowNum%, lineNum%))
+    END IF
+END FUNCTION
+
+SUB LoadFileIntoWindow (fileName$, windowNum%)
+    ' Load a file into a window's memory
+
+    OPEN fileName$ FOR INPUT AS #1
+    FOR lineNum% = 1 TO 1000
+        IF EOF(1) <> 0 THEN
+            GOTO FileLoaded
+        END IF
+        LINE INPUT #1, lineContent$
+        SendLineToWindow windowNum%, lineNum%, lineContent$
+    NEXT lineNum%
+
+FileLoaded:
+    CLOSE #1
+
+    ' Fill the remaining lines with empty strings
+    FOR blankLineNum% = lineNum% TO 1000
+        SendLineToWindow windowNum%, blankLineNum%, ""
+    NEXT blankLineNum%
+END SUB
+
+SUB RefreshAllWindows
+    ' Redraw all active windows
+
+    CLS
+    FOR windowNum% = 1 TO 10
+        IF windowActiveStatus(windowNum%) > 0 THEN
+            ShowWindow windowNum%
+        END IF
+    NEXT windowNum%
+END SUB
+
+SUB SendLineToWindow (windowNum%, lineNum%, newString$)
+    ' Stores a string in a window's memory
+
+    lineContent$ = newString$
+
+    ' Remove trailing spaces from the string
+    IF lineContent$ = SPACE$(LEN(lineContent$)) THEN
+        lineContent$ = ""
+    END IF
+
+    IF LEN(lineContent$) > 0 THEN
+TrimRight:
+        IF RIGHT$(lineContent$, 1) = " " THEN
+            lineContent$ = LEFT$(lineContent$, LEN(lineContent$) - 1)
+            GOTO TrimRight
+        END IF
+    END IF
+
+    ' Update the window memory with the new string
+    IF lineContent$ = "" THEN
+        IF windowData(windowNum%, lineNum%) > 0 THEN
+            textStorage$(windowData(windowNum%, lineNum%)) = "": windowData(windowNum%, lineNum%) = 0
+        END IF
+    ELSE
+        IF windowData(windowNum%, lineNum%) = 0 THEN
+            windowData(windowNum%, lineNum%) = GetFreeLineIndex%
+        END IF
+        textStorage$(windowData(windowNum%, lineNum%)) = lineContent$
+    END IF
+END SUB
+
+SUB ShowWindow (windowNum%)
+    ' Draws a window on the screen
+
+    ' Determine background color based on active window
+    IF windowNum% = currentActiveWindow% THEN
+        bgColor% = 1
+    ELSE
+        bgColor% = 0
+    END IF
+
+    x% = windowX(windowNum%)
+    y% = windowY(windowNum%)
+    widt% = windowWidth(windowNum%)
+    heigh% = windowHeight(windowNum%)
+    title$ = windowTitle$(windowNum%)
+
+    COLOR 11, bgColor%
+
+    ' Create border components
+    FOR borderSegment% = 1 TO widt% - 2
+        topBottom$ = topBottom$ + CHR$(205)
+    NEXT borderSegment%
+    borderTop$ = CHR$(201) + topBottom$ + CHR$(187)
+    borderBottom$ = CHR$(200) + topBottom$ + CHR$(188)
+
+    ' Draw top border
+    LOCATE y%, x%
+    PRINT borderTop$
+
+    ' Draw bottom border
+    LOCATE y% + heigh% - 1, x%
+    PRINT borderBottom$
+
+    ' Draw window content
+    FOR lineNum% = 1 TO heigh% - 2
+        LOCATE y% + lineNum%, x%
+        lineContent$ = GetLineFromWindow$(windowNum%, lineNum% + windowShiftY(windowNum%))
+        lineContent$ = lineContent$ + SPACE$(300)
+        lineContent$ = RIGHT$(lineContent$, LEN(lineContent$) - windowShiftX(windowNum%))
+        lineContent$ = LEFT$(lineContent$, widt% - 2)
+        PRINT CHR$(186) + lineContent$ + CHR$(186)
+    NEXT lineNum%
+
+    ' Draw window title
+    titleX% = INT(x% + (widt% / 2) - (LEN(title$) / 2) - 2)
+    LOCATE y%, titleX%
+    PRINT "[ "
+    titleX% = titleX% + 2
+
+    COLOR 10
+    LOCATE y%, titleX%
+    PRINT title$
+
+    titleX% = titleX% + LEN(title$)
+    COLOR 11
+    LOCATE y%, titleX%
+    PRINT " ]"
+    COLOR 7, 0
+END SUB
+
+SUB InitializeSystem
+    ' Initialize the screen and shared memory
+
+    WIDTH 80, 50
+    VIEW PRINT 1 TO 50
+
+    FOR storageIndex% = 1 TO maxStorage%
+        textStorage$(storageIndex%) = ""
+    NEXT storageIndex%
+
+    storagePointer% = 1
+END SUB
\ No newline at end of file
diff --git a/Miscellaneous/windowing system.webm b/Miscellaneous/windowing system.webm
new file mode 100644
index 0000000..1a456bb
Binary files /dev/null and b/Miscellaneous/windowing system.webm differ
diff --git a/Networking/COM port terminal.bas b/Networking/COM port terminal.bas
new file mode 100755
index 0000000..f60bb6e
--- /dev/null
+++ b/Networking/COM port terminal.bas	
@@ -0,0 +1,35 @@
+' Simple COM port terminal
+' made by Svjatoslav Agejenko
+' in 2003.12
+' H-Page: svjatoslav.eu
+' E-Mail: svjatoslav@svjatoslav.eu
+
+CLS
+
+1
+    ' Read the status of the COM port
+    portStatus = INP(&H3FD)
+
+    ' Check if data is available
+    IF portStatus = 97 THEN
+        ' Read the data from the COM port
+        comData = INP(&H3F8)
+
+        ' Print the character and its ASCII value
+        PRINT CHR$(comData);
+        PRINT comData;
+    END IF
+
+    ' Get user input
+    userInput$ = INKEY$
+
+    ' If there is any input, print it and send to COM port
+    IF userInput$ <> "" THEN
+        PRINT userInput$;
+
+        ' Send the ASCII value of the input character to the COM port
+        OUT &H3F8, ASC(userInput$)
+    END IF
+
+' Repeat the process
+GOTO 1
diff --git a/Networking/Digital data over analog audio channel/INPUT.TXT b/Networking/Digital data over analog audio channel/INPUT.TXT
new file mode 100644
index 0000000..9d26a9b
--- /dev/null
+++ b/Networking/Digital data over analog audio channel/INPUT.TXT	
@@ -0,0 +1 @@
+This is sample encoded message!
diff --git a/Networking/Digital data over analog audio channel/OUTPUT.TXT b/Networking/Digital data over analog audio channel/OUTPUT.TXT
new file mode 100644
index 0000000..9d26a9b
--- /dev/null
+++ b/Networking/Digital data over analog audio channel/OUTPUT.TXT	
@@ -0,0 +1 @@
+This is sample encoded message!
diff --git a/Networking/Digital data over analog audio channel/SOUND.XI b/Networking/Digital data over analog audio channel/SOUND.XI
new file mode 100644
index 0000000..60a4fcc
Binary files /dev/null and b/Networking/Digital data over analog audio channel/SOUND.XI differ
diff --git a/Networking/Digital data over analog audio channel/aver.bas b/Networking/Digital data over analog audio channel/aver.bas
new file mode 100644
index 0000000..e984ed5
--- /dev/null
+++ b/Networking/Digital data over analog audio channel/aver.bas	
@@ -0,0 +1,73 @@
+' Noise reduction
+' made by Svjatoslav Agejenko
+' in 2003.12
+' H-Page: svjatoslav.eu
+' E-Mail: svjatoslav@svjatoslav.eu
+ 
+
+
+DECLARE SUB start ()
+DEFINT A-Y
+DIM SHARED avb(1 TO 100)
+DIM SHARED byte AS STRING * 1
+DIM SHARED po, pod
+DIM SHARED file1$, file2$
+
+start
+
+INPUT "average factor:", po
+INPUT "divide factor:", pod
+
+OPEN file2$ FOR BINARY AS #1
+OPEN file1$ FOR BINARY AS #2
+
+SCREEN 12
+px = 0
+1
+GET #1, , byte
+c = ASC(byte)
+IF c > 127 THEN c = c - 255
+
+FOR a = 1 TO po - 1
+avb(a) = avb(a + 1)
+NEXT a
+avb(po) = c
+
+b = 0
+FOR a = 1 TO po
+b = b + avb(a)
+NEXT a
+
+b = b / pod
+'LINE (px + 1, 0)-(px + 1, 260), 14
+LINE (px, 0)-(px, 260), 0
+PSET (px, c + 130), 12
+PSET (px, b + 130), 14
+px = px + 1
+IF px > 639 THEN px = 1
+IF b < 0 THEN b = b + 255
+IF b > 255 THEN b = 255
+byte = CHR$(b)
+PUT #2, , byte
+'c$ = INPUT$(1)
+IF EOF(1) = 0 THEN GOTO 1
+
+CLOSE #2
+CLOSE #1
+
+SUB start
+
+IF COMMAND$ = "" THEN END
+b$ = COMMAND$
+file2$ = b$
+file1$ = ""
+FOR a = 1 TO LEN(b$)
+c$ = RIGHT$(LEFT$(b$, a), 1)
+IF c$ = "." OR c$ = " " THEN GOTO 2
+file1$ = file1$ + c$
+NEXT a
+2
+file1$ = file1$ + ".awe"
+
+END SUB
+
diff --git a/Networking/Digital data over analog audio channel/index.org b/Networking/Digital data over analog audio channel/index.org
new file mode 100755
index 0000000..83bf69b
--- /dev/null
+++ b/Networking/Digital data over analog audio channel/index.org	
@@ -0,0 +1,9 @@
+* data in sound
+
+Utility to encode/decode digital information into wave sound file.
+You can later record it on the tape or send it acustically or
+for example over telephone line. Decoding utility
+is petty noise tolerant.
+
+
+[[file:screenshot.png]]
diff --git a/Networking/Digital data over analog audio channel/msg2xi.bas b/Networking/Digital data over analog audio channel/msg2xi.bas
new file mode 100644
index 0000000..45c1c9b
--- /dev/null
+++ b/Networking/Digital data over analog audio channel/msg2xi.bas	
@@ -0,0 +1,163 @@
+' Utility that encodes arbitrary text message into 8 bit sound file.
+' This audio can be now transferred over telephone line or recorded to magnetic tape.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001, Initial version
+' 2024.09, Improved program readability
+
+DECLARE SUB StartProgram ()
+DECLARE SUB AddIWave ()
+DECLARE SUB AddOWave ()
+DECLARE SUB ByteToSound (soundByte AS SINGLE)
+
+DIM SHARED iwaveArray(1 TO 20)
+DIM SHARED owaveArray(1 TO 41)
+DIM SHARED iwaveData$
+DIM SHARED owaveData$
+DIM SHARED inputFile$
+DIM SHARED outputFile$
+DIM SHARED byte AS STRING * 1
+
+StartProgram
+
+inputFile$ = "input.txt"
+outputFile$ = "sound.xi"
+
+' Open the input and output files for binary access
+OPEN inputFile$ FOR BINARY AS #2
+OPEN outputFile$ FOR BINARY AS #1
+
+' Add data start header/marker to the audio file
+FOR a = 1 TO 50
+    AddIWave
+NEXT a
+AddOWave
+
+' Read each byte from the input file and convert it to sound
+2
+GET #2, , byte
+ByteToSound ASC(byte)
+IF EOF(2) = 0 THEN GOTO 2
+
+' Close the files after processing
+CLOSE #2
+CLOSE #1
+
+PRINT "Encoding of message into sound completed"
+
+SUB ByteToSound (soundByte AS SINGLE)
+' Convert a byte to 8-bit wave sound data
+    soundByte = soundByte + 1
+
+    ' Check if the byte value is greater than 128.
+    ' If yes, set most significant bit to 1, otherwise 0
+    IF soundByte > 128 THEN
+        soundByte = soundByte - 128
+        AddIWave
+    ELSE
+        AddOWave
+    END IF
+
+    ' Check if the byte value is greater than 64 to set next bit
+    IF soundByte > 64 THEN
+        soundByte = soundByte - 64
+        AddIWave
+    ELSE
+        AddOWave
+    END IF
+
+    IF soundByte > 32 THEN
+        soundByte = soundByte - 32
+        AddIWave
+    ELSE
+        AddOWave
+    END IF
+
+    IF soundByte > 16 THEN
+        soundByte = soundByte - 16
+        AddIWave
+    ELSE
+        AddOWave
+    END IF
+
+    IF soundByte > 8 THEN
+        soundByte = soundByte - 8
+        AddIWave
+    ELSE
+        AddOWave
+    END IF
+
+    IF soundByte > 4 THEN
+        soundByte = soundByte - 4
+        AddIWave
+    ELSE
+        AddOWave
+    END IF
+
+    IF soundByte > 2 THEN
+        soundByte = soundByte - 2
+        AddIWave
+    ELSE
+        AddOWave
+    END IF
+
+    ' Check if the byte value is greater than 1
+    IF soundByte > 1 THEN
+        AddIWave
+    ELSE
+        AddOWave
+    END IF
+END SUB
+
+SUB AddIWave
+' Write iwaveData to the output file
+    PUT #1, , iwaveData$
+END SUB
+
+SUB AddOWave
+' Write owaveData to the output file
+    PUT #1, , owaveData$
+END SUB
+
+SUB StartProgram
+' Initialize wave data arrays
+
+    pi = 3.141592653999996#
+
+    ' Generate sine wave values to represent 1
+    b = 0
+    FOR a = pi / 2 TO 2.5 * pi STEP (2 * pi / 20)
+        b = b + 1
+        iwaveArray(b) = SIN(a) * 100
+        IF iwaveArray(b) < 0 THEN
+            iwaveArray(b) = iwaveArray(b) + 255
+        END IF
+    NEXT a
+
+    ' Generate sine wave values to represent 0
+    b = 0
+    FOR a = pi / 2 TO 2.5 * pi STEP (2 * pi / 40)
+        b = b + 1
+        owaveArray(b) = SIN(a) * 100
+        IF owaveArray(b) < 0 THEN
+            owaveArray(b) = owaveArray(b) + 255
+        END IF
+    NEXT a
+
+' Convert wave arrays to string data
+
+    ' Convert iwaveArray to string because strings are more computationally efficient to write into output file.
+    FOR a = 1 TO 20
+        iwaveData$ = iwaveData$ + CHR$(iwaveArray(a))
+    NEXT a
+
+    ' Convert owaveArray to string
+    FOR a = 1 TO 40
+        owaveData$ = owaveData$ + CHR$(owaveArray(a))
+    NEXT a
+
+END SUB
diff --git a/Networking/Digital data over analog audio channel/screenshot.png b/Networking/Digital data over analog audio channel/screenshot.png
new file mode 100755
index 0000000..87a3a0a
Binary files /dev/null and b/Networking/Digital data over analog audio channel/screenshot.png differ
diff --git a/Networking/Digital data over analog audio channel/xi2msg.bas b/Networking/Digital data over analog audio channel/xi2msg.bas
new file mode 100644
index 0000000..caa0b24
--- /dev/null
+++ b/Networking/Digital data over analog audio channel/xi2msg.bas	
@@ -0,0 +1,332 @@
+' Utility that decodes text message from 8 bit audio recording.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2001, Initial version
+' 2024 - 2025, Improved program readability
+'
+' Data is encoded in the audio by using frequency modulation.
+' When decoding data, program locates peaks between waveforms.
+' Then it calculates distance between peaks.
+' Long between peak distance is interpreted as 0 bit, short distance is 1 bit.
+' Bits 0 and 1 are then sequentially added into bytes and complete
+' message is decoded and shown on the screen. In addition, message is written out to
+' the file.
+'
+' Frequency modulation was chosen over amplitude modulation because
+' my tests with cassette tape recorder showed that distortions affect mostly
+' signal amplitude, but do not affect signal frequency that much.
+'
+' Data carrying audio is preceded with special header tone. Program detects header tone
+' and uses it to calculate baseline signal frequency that it will use later to decode bits.
+' Also header allows to mark precise data starting point.
+
+DEFINT A-Y
+DECLARE SUB bysf (a$, d)
+DECLARE SUB messa (a$)
+DECLARE SUB pfo (f, t, it)
+DECLARE SUB anal ()
+DECLARE SUB start ()
+DECLARE SUB iadd ()
+DECLARE SUB oadd ()
+DECLARE SUB byt (a)
+
+DIM SHARED file1$
+DIM SHARED file2$
+
+' Contains the actual audio waveform samples
+DIM SHARED audioBuffer(-100 TO 10000)
+DIM SHARED bus AS STRING * 1000
+DIM SHARED bufi
+DIM SHARED bg
+DIM SHARED sm
+DIM SHARED beg
+DIM SHARED wai
+DIM SHARED old2
+
+' Statistical Analysis Array (contains measured peak distances)
+DIM SHARED statisticalArray(1 TO 10)
+DIM SHARED statl
+DIM SHARED aver
+DIM SHARED byte AS STRING * 1
+DIM SHARED avv
+
+DIM SHARED li
+DIM SHARED oc
+DIM SHARED px
+
+start
+messa "Searching for beginning..."
+
+OPEN "output.txt" FOR BINARY AS #1
+OPEN "sound.xi" FOR BINARY AS #2
+SEEK #2, 360
+
+2
+GET #2, , bus
+FOR a = 1 TO 1000
+    b$ = RIGHT$(LEFT$(bus, a), 1)
+    bufi = bufi + 1
+    c = ASC(b$)
+    IF c > 127 THEN c = c - 255
+    audioBuffer(bufi) = c
+NEXT a
+IF (EOF(2) = 0) AND (bufi < 8000) THEN GOTO 2
+anal
+IF EOF(2) = 0 THEN GOTO 2
+
+CLOSE #2
+CLOSE #1
+
+SYSTEM
+
+SUB anal
+    ' Draw a vertical line to represent the buffer data
+    LINE (1, 170)-(200, 430), 0, BF
+
+    FOR a = 1 TO bufi - (avv - 1)
+        ' Draw horizontal lines at key points
+        LINE (100, 170)-(100, 430), 13
+        LINE (old2 - a + 100, 170)-(old2 - a + 100, 430), 11
+        LINE (0, 300)-(200, 300), 13
+
+        ' Plot the buffer data points
+        FOR b = 0 TO 200
+            PSET (b, audioBuffer(b + a - 101) + 300), 0
+            PSET (b, audioBuffer(b + a - 100) + 300), 14
+        NEXT b
+
+        LINE (old2 - a + 100, 170)-(old2 - a + 100, 430), 0
+
+        ' Calculate the average value of the buffer segment
+        c = 0
+        FOR b = a TO a + (avv - 1)
+            c = c + audioBuffer(b)
+        NEXT b
+        c = c / (avv / 2)
+
+        ' Determine if we are in a high or low state
+        IF c > oc THEN
+            IF li = -1 THEN
+                li = 1
+                pfo a + ((avv - 1) / 2 - 1), 1, oc
+                GOTO 3
+            END IF
+        END IF
+
+        IF c < oc THEN
+            IF li = 1 THEN
+                li = -1
+                pfo a + ((avv - 1) / 2 - 1), 2, oc
+                GOTO 3
+            END IF
+        END IF
+
+    3
+        ' Update the current average value
+        oc = c
+    NEXT a
+
+    ' Shift the buffer data to the left
+    FOR a = bufi - (avv - 2) TO bufi
+        audioBuffer(a - (bufi - (avv - 2)) + 1) = audioBuffer(a)
+    NEXT a
+
+    ' Update the starting index of the buffer
+    old2 = old2 - (bufi - (avv - 2)) + 1
+    bufi = avv - 1
+
+END SUB
+
+SUB bysf (a$, d)
+    ' Draw a horizontal line to represent the byte data
+    LINE (201, 170)-(639, 430), 1, B
+
+    IF d = 10 THEN px = 0: a$ = "": GOTO 5
+
+    px = px + 1
+    IF px > 53 THEN
+        px = 1
+    5
+    DIM tempr(1 TO 32000)
+    GET (201, 186)-(639, 430), tempr(1)
+    PUT (201, 170), tempr(1), PSET
+    LINE (201, 414)-(639, 430), 0, BF
+    END IF
+
+    ' Print the byte data to the screen
+    LOCATE 26, 26 + px
+    PRINT a$
+
+    ' Convert the byte value to a character and write it to the output file
+    byte = CHR$(d)
+    PUT #1, , byte
+
+END SUB
+
+SUB byt (a)
+
+    ' Draw a horizontal line to represent the bit data
+    LINE (410, 0)-(639, 169), 1, B
+
+    statl = statl + 1
+    IF statl > 8 THEN
+        statl = 1
+        b = 0
+        IF statisticalArray(1) = 1 THEN b = b + 128
+        IF statisticalArray(2) = 1 THEN b = b + 64
+        IF statisticalArray(3) = 1 THEN b = b + 32
+        IF statisticalArray(4) = 1 THEN b = b + 16
+        IF statisticalArray(5) = 1 THEN b = b + 8
+        IF statisticalArray(6) = 1 THEN b = b + 4
+        IF statisticalArray(7) = 1 THEN b = b + 2
+        IF statisticalArray(8) = 1 THEN b = b + 1
+
+        ' Print the byte value to the screen
+        LOCATE 10, 69
+        PRINT b
+
+        ' Print the hexadecimal representation of the byte value
+        LOCATE 10, 75
+        PRINT HEX$(b)
+
+        ' Print the character representation of the byte value
+        LOCATE 10, 79
+        c$ = CHR$(b)
+
+        ' Replace control characters with a space
+        IF b = 7 OR b = 8 OR b = 10 OR b = 12 OR b = 13 THEN c$ = " "
+
+        PRINT c$
+
+        bysf c$, b
+
+    DIM tempr(1 TO 10000)
+    GET (410, 16)-(639, 169), tempr(1)
+    PUT (410, 0), tempr(1), PSET
+    LINE (410, 153)-(639, 169), 0, BF
+    END IF
+
+    ' Print the bit value to the screen
+    LOCATE 10, 50 + (statl * 2)
+
+    statisticalArray(statl) = a
+
+    PRINT a
+
+END SUB
+
+SUB messa (a$)
+    ' Draw a horizontal line to represent the message data
+    LINE (0, 0)-(409, 169), 1, B
+
+    DIM tempr(1 TO 20000)
+
+    GET (0, 16)-(409, 169), tempr(1)
+
+    PUT (0, 0), tempr(1), PSET
+
+    LINE (0, 153)-(409, 169), 0, BF
+
+    ' Print the message to the screen
+    LOCATE 10, 1
+
+    PRINT a$
+
+END SUB
+
+SUB pfo (f, t, it)
+    IF t = 2 THEN
+        bg = it
+
+        IF wai > 0 THEN wai = wai - 1
+
+        ' Check if we have found data start header
+        IF (bg - sm > 6) AND (beg = 0) THEN
+            beg = 1
+            wai = 10
+            messa "Beginning point found!"
+        END IF
+
+        ' Perform statistical analysis if needed
+        IF (wai = 0) AND (beg = 1) THEN
+            IF statl = 0 THEN messa "Beginning statistical analyze"
+
+            statl = statl + 1
+
+            IF statl > 10 THEN
+                FOR a = 1 TO 10
+                    aver = aver + statisticalArray(a)
+                NEXT a
+
+                aver = aver * 1.5 / 10
+
+                beg = 2
+
+                statl = 1
+
+                messa "Statistical analyze completed!"
+            END IF
+
+            ' Store the current frame index
+            statisticalArray(statl) = f - old2
+        END IF
+
+        ' Decode the bits if we are in the decoding state
+        IF beg = 2 THEN
+            IF f - old2 >= aver THEN
+                beg = 3
+
+                statl = 0
+
+                FOR a = 1 TO 8
+                    statisticalArray(a) = 0
+                NEXT a
+
+                GOTO 4
+            END IF
+        END IF
+
+        ' Decode the bits based on the current state
+        IF beg = 3 THEN
+            IF f - old2 >= aver THEN
+                byt 0
+            ELSE
+                byt 1
+            END IF
+        END IF
+
+    4
+
+        old2 = f
+    ELSE
+        sm = it
+    END IF
+END SUB
+
+SUB start
+
+    ' Set the screen mode to graphics
+    SCREEN 12
+
+    ' Initialize buffer index and other variables
+    bufi = 0
+
+    beg = 0
+
+    statl = 0
+
+    aver = 0
+
+    px = 0
+
+    avv = 7
+
+    li = 1
+
+    oc = -9999
+
+END SUB
\ No newline at end of file
diff --git a/Networking/LPT communication driver/lptdrv.asm b/Networking/LPT communication driver/lptdrv.asm
new file mode 100644
index 0000000..599a545
--- /dev/null
+++ b/Networking/LPT communication driver/lptdrv.asm	
@@ -0,0 +1,281 @@
+; Svjatoslav Agejenko
+; 2002.08
+; compile with FASM - Flat Assembler
+
+;	TSR driver for LPT1 communication.
+;	Functions by INT 63h:
+
+;	  Deactivate
+;	AH = 0
+
+;	  Activate
+;	AH = 1
+
+;	  Get downloaded data
+;	AH = 2
+;	ES:DI	- pointer where to place downloaded data
+;	on return:
+;	AX = Number of bytes downloaded
+
+;	copies downloaded data from driver input buffers to
+;	specified place.	
+
+;	  Upload data
+;	AH = 3
+;	DS:SI	- pointer for data to be uploaded
+;	CX	- amount of bytes to upload 
+
+;	After interrupt, data will be immediately
+;	moved to communication driver own output buffer,
+;	and sent when line becomes avaiable.
+ 
+myint = 63h	; interrupt to hook
+upbuf = 5000	; upload buffer size
+downbuf = 5000	; download buffer size
+InPort = 37ah	; input port, for Parallel Printer Port Control Register
+defspd = 3	; Default communication speed
+upbufp = last + downbuf
+
+
+org	100h
+
+;============================ TSR initialization ====================
+
+mov	dx, InPort	; reset line
+mov	al, 0
+out	dx, al
+
+mov	ax, 0		; Saves old interrupt vector
+mov	es, ax
+mov	eax, [es:32]
+mov	[d2], eax	
+
+cli
+mov	ax, cs		; Set new interrupt vector for IRQ 0
+shl	eax, 16
+mov	ax, custom
+mov	[es:32], eax
+mov	ax, int63	; Set new interrupt vector for INT 63
+mov	[es:4 * myint], eax
+sti
+
+
+mov     ax, last        ; Calculate needed memory size, begin TSR
+add     ax, upbuf + downbuf + 1000
+mov     dx, 0
+mov     bx, 16
+div     bx
+mov     dx, ax
+mov     ax, 3100h
+int     21h
+d2 	dd 0
+
+;============================ IRQ 0 handler =========================
+
+custom:
+pushf			; Execute default code in old int vector
+call	dword [cs:d2]
+
+;pusha                   ; Write 1 character, for debugging
+;mov     ax, 0e01h
+;mov     bx, 0
+;int     10h
+;popa
+
+inc	byte [cs:tmr]	; Update timer
+
+cmp	[cs:progress], 0 ; Check if custom routine is already active
+jne	EndOfRoutine
+cmp	[cs:enabled], 0 ; Check if driver is enabled
+je	EndOfRoutine
+
+mov	[cs:progress], 1 ; Set active flag
+pusha
+push	ds
+push	es
+
+mov	dx, InPort
+in	al, dx
+shl     al, 4
+cmp     al, 128
+jb      checkdone
+
+;============================ download data from LPT ================
+
+mov	ax, cs
+mov	es, ax
+mov	ds, ax
+mov	di, last
+add	di, [dbufsiz]
+mov	bh, 0
+
+SkipHeader:
+in	al, dx
+shl	al, 6
+cmp	al, 128
+jae	SkipHeader
+mov	ah, 255
+mov	cx, 0
+
+SkipBit:
+inc	cx
+cmp	cx, 30
+je	MkHeader
+in	al, dx
+cmp	al, ah
+je	SkipBit
+in	al, dx
+
+mov	cx, 0
+mov	ah, al
+shr	al, 3
+or	al, 254
+sub	al, 254
+
+shl	bl, 1
+add	bl, al
+inc	bh
+cmp	bh, 8
+jb	SkipBit
+
+mov	al, bl
+stosb
+mov	bh, 0
+mov	bl, bh
+jmp	SkipBit
+
+MkHeader:
+mov	ax, di
+sub	ax, last
+sub	ax, [dbufsiz]
+stosw
+mov	ax, di
+sub	ax, last
+mov	[dbufsiz], ax
+
+checkdone:
+cmp	word [cs:ubufsiz], 0
+je	alldone
+
+; =========================== send data to LPT ======================
+
+mov	ax, cs
+mov	ds, ax
+mov	byte [tmr], 0
+
+mov	dx, InPort
+mov	al, 255
+out	dx, al
+mov	si, upbufp
+mov	cx, [ubufsiz]
+
+sti
+SendHeader:
+cmp     byte [tmr], 2
+jb	SendHeader
+cli
+
+SendByte:
+cmp	cx, 0
+je	sent
+
+mov	bl, 0
+lodsb
+
+SendBit:
+push	ax
+push	cx
+shr	al, 4
+or	al, 247
+sub	al, 247
+mov	bh, bl
+or	bh, 254
+sub	bh, 254
+shl	bh, 1
+add	al, bh
+
+mov	ch, 0
+mov	cl, [spd]
+WaitForBit:
+out	dx, al
+loop	WaitForBit
+pop	cx
+pop	ax
+inc	bl
+shl	al, 1
+cmp	bl, 8
+jb	SendBit
+
+dec	cx
+jmp	SendByte
+sent:
+
+mov	al, 0
+out	dx, al
+mov word [ubufsiz], 0
+
+
+alldone:
+pop	es
+pop	ds
+popa
+mov	[cs:progress], 0 ; Terminate active flag
+EndOfRoutine:
+iret
+
+progress db 0
+enabled db 0
+dbufsiz dw 0
+ubufsiz dw 0
+tmr	db 0
+spd	db defspd
+
+;============================ INT 63h handler =======================
+
+int63:
+cmp	ah, 0
+je	set_unactive
+cmp	ah, 1
+je	set_active
+cmp	ah, 2
+je	get_data
+cmp	ah, 3
+je	send_data
+jmp	EndOfRoutine
+
+set_active:
+mov	dx, InPort	; reset line
+mov	al, 0
+out	dx, al
+mov	[cs:enabled], 1
+jmp	EndOfRoutine
+
+set_unactive:
+mov	[cs:enabled], 0
+jmp	EndOfRoutine
+
+get_data:
+push	ds
+mov	ax, cs
+mov	ds, ax
+mov	si, last
+mov	cx, [dbufsiz]
+rep	movsb
+pop	ds
+mov	ax, [cs:dbufsiz]
+mov	[cs:dbufsiz], 0
+jmp	EndOfRoutine
+
+send_data:
+push	es
+mov	dx, cx
+mov	bx, cs
+mov	es, bx
+mov	di, upbufp
+add	di, [cs:ubufsiz]
+rep	movsb
+add	[cs:ubufsiz], dx
+pop	es
+jmp	EndOfRoutine
+
+last:
diff --git a/Networking/LPT communication driver/lptdrv.com b/Networking/LPT communication driver/lptdrv.com
new file mode 100644
index 0000000..8abfb4e
Binary files /dev/null and b/Networking/LPT communication driver/lptdrv.com differ
diff --git a/Networking/LPT communication driver/lptdrv.txt b/Networking/LPT communication driver/lptdrv.txt
new file mode 100644
index 0000000..d276f46
--- /dev/null
+++ b/Networking/LPT communication driver/lptdrv.txt	
@@ -0,0 +1,23 @@
+LPT communications driver
+made by Svjatoslav Agejenko
+in 2002.08
+H-Page: svjatoslav.eu
+E-Mail: svjatoslav@svjatoslav.eu
+ 
+LPTDRV is a memory resident driver for LPT network.
+It hooks IRQ 0 and checks ca. 18 times per second LPT status.
+If any activity found it reads and decodes recieved data,
+and stores it into its 5000 bytes input buffer. It has also
+5000 bytes output buffer for sending data.
+Applications can communicate with this driver by INT 63h.
+see LPTDRV.ASM for more details.
+
+
+Parallel printer port pins 14, 17, 18
+must be connected on both computers directly, eg. one to one.
+
+pin 14 carries syncronisation signal. 0 1 0 1 0 1 ...
+pin 17 is used for data input/output.
+pin 18 is ground.
+
+Maximum transfer speed on my computer was ~ 12 Kb/s.
diff --git a/Networking/LPT communication driver/test.ASM b/Networking/LPT communication driver/test.ASM
new file mode 100644
index 0000000..e98e680
--- /dev/null
+++ b/Networking/LPT communication driver/test.ASM	
@@ -0,0 +1,100 @@
+; simple driver test
+
+org 100h
+
+mov     ah, 1   ; activate driver
+int	63h
+
+l1:
+mov	di, last
+mov	ah, 2
+int	63h
+cmp	ax, 0
+je	l2
+
+cmp	byte [last], 0
+jne	l3
+call	send4kb
+jmp	l2
+l3:
+
+add	ax, last
+mov	di, ax
+mov	byte [ds:di], 36
+
+mov	ah, 9
+mov	dx, d1
+int	21h
+
+
+l2:
+
+mov     ah, 0bh
+int     21h
+cmp     al, 0
+je      l1
+
+
+mov     ah, 0
+int     16h
+cmp     al, 27
+je      quit
+cmp	al, 13
+je	send
+cmp	al, 32
+je	TestSpeed
+
+jmp     l1
+
+quit:
+mov     ah, 0   ; deactivate driver
+int	63h
+ret
+
+send:
+mov     cx, d1 - d2
+mov	si, d2
+mov	ah, 3
+int	63h
+jmp	l1
+
+send4kb:
+mov	cx, 4096
+mov	si, last
+mov	ah, 3
+int	63h
+ret
+
+TestSpeed:
+mov	byte [last], 0
+mov     cx, 0
+
+l5:
+push	cx
+call	send4kb
+l4:
+mov     di, last + 1
+mov	ah, 2
+int	63h
+cmp	ax, 0
+je      l4
+pop	cx
+
+mov     dx, d3
+mov     ah, 9
+int     21h
+
+inc     cx
+cmp     cx, 100
+jb      l5
+
+mov     dx, d4
+mov     ah, 9
+int     21h
+jmp	l1
+
+d3      db '. $'
+d4      db 13, 10, 'done', 13, 10, '$'
+d2	db 'Quick brown fox jumped over the lazy dogs. 0123456789ABCDEF'
+d1	db 13,10,'Data recieved:'
+last:
diff --git a/Networking/LPT communication driver/test.COM b/Networking/LPT communication driver/test.COM
new file mode 100644
index 0000000..1a4847f
Binary files /dev/null and b/Networking/LPT communication driver/test.COM differ
diff --git a/Networking/LPT morse.bas b/Networking/LPT morse.bas
new file mode 100755
index 0000000..7527ae6
--- /dev/null
+++ b/Networking/LPT morse.bas	
@@ -0,0 +1,132 @@
+' Svjatoslav Agejenko
+' 2003.02, initial version
+' 2024, fixing code readability
+
+' Program to control radio transmitter over LPT port,
+' and send data in morse like code.
+
+DECLARE SUB sbit (a!)
+DECLARE SUB msg (a$)
+DECLARE SUB sb (a!)
+DECLARE SUB quit ()
+DECLARE SUB tone (c!)
+DECLARE SUB wai (a!)
+DECLARE SUB echo ()
+DECLARE SUB lptsend ()
+DIM SHARED bit(0 TO 7)
+DIM SHARED port
+
+CLS
+port = &H378
+echo
+
+l = 0
+1
+IF timeStr$ <> TIME$ THEN
+    IF l > 60 THEN
+        echo
+        l = 0
+    END IF
+    l = l + 1
+    timeStr$ = TIME$
+END IF
+
+key$ = INKEY$
+IF key$ <> "" THEN quit
+GOTO 1
+
+SUB echo
+
+bit(5) = 1
+lptsend
+wai 5
+
+msg "Hello!"
+' msg "Hello, world!"
+
+wai 1
+bit(5) = 0
+lptsend
+
+END SUB
+
+SUB lptsend
+
+b = 0
+FOR a = 0 TO 7
+    b = b * 2
+    IF bit(a) > 0 THEN
+        b = b + 1
+    END IF
+NEXT a
+
+OUT port, b
+
+END SUB
+
+SUB msg (message$)
+
+FOR a = 1 TO LEN(message$)
+    char$ = RIGHT$(LEFT$(message$, a), 1)
+    sb ASC(char$)
+    key$ = INKEY$
+    IF key$ <> "" THEN quit
+NEXT a
+
+END SUB
+
+SUB quit
+bit(5) = 0
+lptsend
+END
+END SUB
+
+SUB sb (asciiVal)
+d = asciiVal
+c = 128
+
+FOR b = 0 TO 7
+    IF d >= c THEN
+        sbit 1
+        d = d - c
+    ELSE
+        sbit 0
+    END IF
+    c = c / 2
+NEXT b
+
+END SUB
+
+SUB sbit (value)
+IF value = 1 THEN
+    tone 0
+    tone 0
+    tone 1
+ELSE
+    tone 0
+    tone 1
+    tone 1
+END IF
+END SUB
+
+SUB tone (cValue)
+' cValue = 1
+PRINT cValue;
+FOR a = 1 TO 40
+    bit(4) = cValue
+    lptsend
+    FOR b = 1 TO 500
+        NEXT b
+    bit(4) = 0
+    lptsend
+    FOR b = 1 TO 500
+        NEXT b
+NEXT a
+END SUB
+
+SUB wai (aValue)
+FOR b = 1 TO aValue * 10
+    SOUND 0, .1
+NEXT b
+
+END SUB
\ No newline at end of file
diff --git a/Networking/LPT pin control.bas b/Networking/LPT pin control.bas
new file mode 100755
index 0000000..c7f2cac
--- /dev/null
+++ b/Networking/LPT pin control.bas	
@@ -0,0 +1,61 @@
+' Program to control voltage on individual LPT port pins.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2024.08, Improved program readability
+'
+' Use keyboard keys 1 - 8 to toggle on/off individual pins.
+
+DECLARE SUB display ()
+DECLARE SUB transmit ()
+DIM SHARED bit(1 TO 8)
+DIM SHARED printerPort
+
+printerPort = &H378
+FOR a = 1 TO 8
+    bit(a) = 0
+NEXT a
+SCREEN 13
+
+MainLoop:
+display
+transmit
+keyInput$ = INPUT$(1)
+IF VAL(keyInput$) > 0 THEN
+    keyValue = VAL(keyInput$)
+    IF bit(keyValue) = 0 THEN
+        bit(keyValue) = 1
+    ELSE
+        bit(keyValue) = 0
+    END IF
+END IF
+
+GOTO MainLoop
+
+SUB display
+
+    ' Display the current status of each pin
+    LOCATE 3, 1
+    PRINT "  1 2 3 4 5 6 7 8"
+
+    FOR a = 1 TO 8
+        LINE (a * 16, 1)-(a * 16 + 8, 9), bit(a), BF
+    NEXT a
+
+END SUB
+
+SUB transmit
+
+    ' Calculate the byte to be sent based on the status of each pin
+    outputByte = 0
+    FOR a = 1 TO 8
+        outputByte = outputByte * 2
+        outputByte = outputByte + bit(a)
+    NEXT a
+
+    OUT printerPort, outputByte
+END SUB
diff --git a/Networking/LPT to COM port data transfer.bas b/Networking/LPT to COM port data transfer.bas
new file mode 100755
index 0000000..2896a79
--- /dev/null
+++ b/Networking/LPT to COM port data transfer.bas	
@@ -0,0 +1,77 @@
+' This is quite unusual program. It sends data from LPT port (parallel
+' printer port) to COM (serial mouse) port. It does it by bit-banging
+' the data out of the LPT port. If you connect appropriate wire from
+' LPT port output bit (pin #3) to COM port input bit, you can send
+' data from LPT to COM.
+'
+' Note:
+' - Ground wire must be connected between LPT and COM ports too.
+' - Use this program at your own risk. It may not work on your system or may even damage it.
+'
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2002, Initial version
+' 2024, Improved program readability
+
+DEFINT A-Z
+DECLARE SUB sendChar (char$)
+DIM SHARED port
+port = &H378 ' LPT port
+
+PRINT "Type something. All keyboard strokes will be transmitted."
+PRINT "ESC to exit"
+
+1
+inputChar$ = INPUT$(1)
+IF inputChar$ = CHR$(27) THEN SYSTEM
+PRINT inputChar$;
+sendChar inputChar$
+GOTO 1
+
+SUB sendChar (char$)
+    ' Convert the character into its ASCII value
+    asciiValue = ASC(char$)
+
+    DIM bitArray(0 TO 8)
+    bitArray(0) = 0
+    bitArray(8) = 0
+
+    bValue = 64
+    cIndex = 7
+2
+    ' Convert the ASCII value into a binary representation
+    IF asciiValue >= bValue THEN
+        bitArray(cIndex) = 1
+        asciiValue = asciiValue - bValue
+    ELSE
+        bitArray(cIndex) = 0
+    END IF
+
+    ' Divide the value by 2 and move to the next bit
+    bValue = bValue / 2
+    cIndex = cIndex - 1
+
+    IF cIndex <> 0 GOTO 2
+
+    ' Send each bit of the character through the LPT port
+    FOR a = 0 TO 8
+        IF bitArray(a) = 0 THEN
+            bValue = 255
+        ELSE
+            bValue = 0
+        END IF
+
+        ' Adjust this loop based on your system and QBasic interpreter speed
+        FOR c = 0 TO 9
+            OUT port, bValue
+        NEXT c
+    NEXT a
+
+    ' Reset the LPT port to 0 after sending the character
+    OUT port, 0
+
+END SUB
diff --git a/Networking/morse.bas b/Networking/morse.bas
new file mode 100755
index 0000000..7d8f3b9
--- /dev/null
+++ b/Networking/morse.bas
@@ -0,0 +1,89 @@
+' Plays entered text in morse code audio beeps using PC-speaker.
+' This program is free software: released under Creative Commons Zero (CC0) license
+' by Svjatoslav Agejenko.
+' Email: svjatoslav@svjatoslav.eu
+' Homepage: http://www.svjatoslav.eu
+'
+' Changelog:
+' 2003, Initial version
+' 2024.08, Improved program readability
+
+DECLARE SUB say()
+DECLARE SUB laus(a$)
+DECLARE SUB char(a!)
+DIM SHARED mors(0 TO 255, 0 TO 9)
+DIM SHARED spd
+spd = 1
+CLS
+
+' Open the Morse code file for reading
+OPEN "morse.txt" FOR INPUT AS #1
+
+' Label to read each line from the file
+2
+IF EOF(1) THEN GOTO 1
+LINE INPUT #1, a$
+
+' Process each character in the current line
+FOR b = 1 TO LEN(a$)
+    c = ASC(RIGHT$(LEFT$(a$, b), 1))
+    IF b = 1 THEN m = c
+    IF b > 2 THEN
+        d = 0
+        IF c = ASC(".") THEN d = 1
+        IF c = ASC("-") THEN d = 2
+        mors(m, b - 2) = d
+    END IF
+NEXT b
+GOTO 2
+
+' Label to close the file
+1
+CLOSE
+
+' Prompt user for input
+PRINT "Type '.bye' to quit"
+
+' Main loop to read and process user input
+3
+PRINT ""
+INPUT "", a$
+IF a$ = ".bye" THEN SYSTEM
+laus a$
+GOTO 3
+
+' Subroutine to play Morse code for a single character
+SUB char(a)
+    PRINT CHR$(a);
+
+    ' Loop through each part of the Morse code sequence
+    FOR b = 0 TO 9
+        IF mors(a, b) = 1 THEN
+            ' Play short beep for a dot
+            SOUND 1000, 1 * spd
+            SOUND 0, 1 * spd
+        END IF
+
+        IF mors(a, b) = 2 THEN
+            ' Play long beep for a dash
+            SOUND 1000, 3 * spd
+            SOUND 0, 1 * spd
+        END IF
+    NEXT b
+
+    ' Short pause between Morse code characters
+    FOR a = 0 TO 160
+        SOUND 0, .1
+    NEXT a
+END SUB
+
+' Subroutine to process and play Morse code for an entire string
+SUB laus(a$)
+    ' Loop through each character in the input string
+    FOR b = 1 TO LEN(a$)
+        c = ASC(RIGHT$(LEFT$(a$, b), 1))
+
+        ' Call char subroutine to play Morse code for the current character
+        char c
+    NEXT b
+END SUB
\ No newline at end of file
diff --git a/Networking/morse.txt b/Networking/morse.txt
new file mode 100644
index 0000000..d695202
--- /dev/null
+++ b/Networking/morse.txt
@@ -0,0 +1,36 @@
+a .-
+b -...
+c -.-.
+d -..
+e .
+f ..-.
+g --.
+h ....
+i ..
+j .---
+k -.-
+l .-..
+m --
+n -.
+o ---
+p .--.
+q --.-
+r .-.
+s ...
+t -
+u ..-
+v ...-
+w .--
+x -..-
+y -.--
+z --..
+0 -----
+1 .----
+2 ..---
+3 ...--
+4 ....-
+5 .....
+6 -....
+7 --...
+8 ---..
+9 ----.
\ No newline at end of file
diff --git a/Tools/Commit and push b/Tools/Commit and push
new file mode 100755
index 0000000..057b511
--- /dev/null
+++ b/Tools/Commit and push	
@@ -0,0 +1,11 @@
+#!/bin/bash
+cd "${0%/*}"; if [ "$1" != "T" ]; then gnome-terminal -e "'$0' T"; exit; fi;
+
+cd ..
+
+cola
+git push
+
+echo ""
+echo "Press ENTER to close this window."
+read
diff --git a/Tools/Open with IntelliJ IDEA b/Tools/Open with IntelliJ IDEA
new file mode 100755
index 0000000..304bf94
--- /dev/null
+++ b/Tools/Open with IntelliJ IDEA	
@@ -0,0 +1,54 @@
+#!/bin/bash
+
+# This script launches IntelliJ IDEA with the current project
+# directory. The script is designed to be run by double-clicking it in
+# the GNOME Nautilus file manager.
+
+# First, we change the current working directory to the directory of
+# the script.
+
+# "${0%/*}" gives us the path of the script itself, without the
+# script's filename.
+
+# This command basically tells the system "change the current
+# directory to the directory containing this script".
+
+cd "${0%/*}"
+
+# Then, we move up one directory level.
+# The ".." tells the system to go to the parent directory of the current directory.
+# This is done because we assume that the project directory is one level up from the script.
+cd ..
+
+# Now, we use the 'setsid' command to start a new session and run
+# IntelliJ IDEA in the background. 'setsid' is a UNIX command that
+# runs a program in a new session.
+
+# The command 'idea .' opens IntelliJ IDEA with the current directory
+# as the project directory.  The '&' at the end is a UNIX command that
+# runs the process in the background.  The '> /dev/null' part tells
+# the system to redirect all output (both stdout and stderr, denoted
+# by '&') that would normally go to the terminal to go to /dev/null
+# instead, which is a special file that discards all data written to
+# it.
+
+setsid idea . &>/dev/null &
+
+# The 'disown' command is a shell built-in that removes a shell job
+# from the shell's active list. Therefore, the shell will not send a
+# SIGHUP to this particular job when the shell session is terminated.
+
+# '-h' option specifies that if the shell receives a SIGHUP, it also
+# doesn't send a SIGHUP to the job.
+
+# '$!' is a shell special parameter that expands to the process ID of
+# the most recent background job.
+disown -h $!
+
+
+sleep 2
+
+# Finally, we use the 'exit' command to terminate the shell script.
+# This command tells the system to close the terminal window after
+# IntelliJ IDEA has been opened.
+exit
diff --git a/Tools/Update web site b/Tools/Update web site
new file mode 100755
index 0000000..13994de
--- /dev/null
+++ b/Tools/Update web site	
@@ -0,0 +1,55 @@
+#!/bin/bash
+cd "${0%/*}"; if [ "$1" != "T" ]; then gnome-terminal -e "'$0' T"; exit; fi;
+cd ..
+
+# Function to export org to html using emacs in batch mode
+export_org_to_html() {
+    local dir=$1
+    if [ -d "$dir" ]; then
+        (
+            cd "$dir" || return 1
+            if [ -f "index.html" ]; then
+                rm -f index.html
+            fi
+            if [ -f "index.org" ]; then
+                emacs --batch -l ~/.emacs --visit=index.org --funcall=org-html-export-to-html --kill
+            else
+                echo "Warning: index.org not found in $dir"
+            fi
+        )
+    else
+        echo "Warning: Directory $dir not found, skipping..."
+    fi
+}
+
+
+# Export org to html for the main index
+export_org_to_html "."
+
+# 2D graphics
+export_org_to_html "2D GFX/Animations"
+export_org_to_html "2D GFX/Fractals"
+export_org_to_html "2D GFX/Spirals"
+export_org_to_html "2D GFX/Textures"
+
+export_org_to_html "3D GFX/3D Synthezier/doc"
+export_org_to_html "3D GFX/Miscellaneous"
+export_org_to_html "3D GFX/Space"
+
+# Upload project homepage to the server.
+rsync -avz --delete  -e 'ssh -p 10006' ./ \
+      --include="*/" \
+      --include="*.html" \
+      --include="*.png" \
+      --include="*.bas" \
+      --include="*.dat" \
+      --include="*.webm" \
+      --include="*.jpeg" \
+      --include="*.blend" \
+      --exclude="*" \
+      n0@www3.svjatoslav.eu:/mnt/big/projects/qbasicapps/
+
+
+echo ""
+echo "Press ENTER to close this window."
+read
diff --git a/Tutorial/Group 1/00.bas b/Tutorial/Group 1/00.bas
new file mode 100755
index 0000000..fc62f12
--- /dev/null
+++ b/Tutorial/Group 1/00.bas	
@@ -0,0 +1,10 @@
+' This program demonstrates a basic "Hello World" example in QuickBasic.
+' It is designed to be simple and easy to understand for novice programmers.
+
+' The following line prints a greeting message to the console.
+PRINT "Hello world!"
+
+' When you run this program, it will output the string "Hello world!" to the screen.
+' This is a traditional first step in learning any new programming language.
+
+' To execute this program, press F5 while in the QuickBasic editor environment.
diff --git a/Tutorial/Group 1/01.bas b/Tutorial/Group 1/01.bas
new file mode 100755
index 0000000..0760259
--- /dev/null
+++ b/Tutorial/Group 1/01.bas	
@@ -0,0 +1,24 @@
+' This QuickBasic program demonstrates basic arithmetic operations
+' and the use of variables. It will perform a series of calculations
+' on a single variable and print the results after each operation.
+
+CLS ' Clears the screen to provide a clean output area
+
+' Initialize a variable with the value 3
+DIM initialValue AS INTEGER
+initialValue = 3
+
+' Print the current value of initialValue
+PRINT "The initial value is: "; initialValue
+
+' Perform multiplication and assign the result back to initialValue
+initialValue = initialValue * 2
+
+' Print the new value after multiplication
+PRINT "After doubling, the value is: "; initialValue
+
+' Perform subtraction and decrease initialValue by 1
+initialValue = initialValue - 1
+
+' Print the final value after subtraction
+PRINT "After decrementing by 1, the value is: "; initialValue
diff --git a/Tutorial/Group 1/02.bas b/Tutorial/Group 1/02.bas
new file mode 100755
index 0000000..ccf5019
--- /dev/null
+++ b/Tutorial/Group 1/02.bas	
@@ -0,0 +1,21 @@
+' This program demonstrates basic arithmetic operations in QuickBasic
+
+CLS ' Clears the screen to provide a clean output area
+
+' Declare a variable 'a' and assign it the value of 7
+DIM a AS INTEGER
+a = 7
+
+' Print the current value of 'a' to the console
+PRINT "The value contained in variable 'a' is: "; a
+
+' Perform a series of arithmetic operations on the value of 'a'
+' and print the result
+PRINT "Performing some calculations with 'a':";
+PRINT (a + 2.1234) / 3 * 4 - 6
+
+' Explanation of the calculation:
+' 1. Add 2.1234 to 'a'
+' 2. Divide the result by 3
+' 3. Multiply the new result by 4
+' 4. Subtract 6 from the final result
diff --git a/Tutorial/Group 1/03.bas b/Tutorial/Group 1/03.bas
new file mode 100755
index 0000000..6f6cebe
--- /dev/null
+++ b/Tutorial/Group 1/03.bas	
@@ -0,0 +1,34 @@
+' This program demonstrates how to use semicolon and comma as separators
+' in PRINT statements within Microsoft QuickBasic.
+
+CLS ' Clears the screen before starting the program
+
+' Semicolon Separator Example
+
+' The semicolon is used to print multiple items on the same line, without
+' advancing to a new line after each item. It is useful for formatting output
+' in a single line of text.
+
+PRINT "Semicolon separator:"
+PRINT 12; 314; 122; 1; 43      ' Prints numbers separated by semicolons on the same line
+PRINT 312; 4; 1; 3111; 3       ' Continues printing more numbers on the next line
+PRINT 3; 2344; 12231; 1; 12333 ' Final set of numbers printed on the last line
+
+' Print an empty line for better readability
+PRINT ' This statement prints an empty line to separate different sections
+
+' Comma Separator Example
+
+' The comma is used as a separator in PRINT statements to print multiple items,
+' each followed by a space and advancing to the next tab column (default is 14
+' characters apart). If there are more items than columns, it will start
+' a new line.
+
+PRINT "Comma separator:"
+PRINT 12, 314, 122, 1, 43      ' Prints numbers separated by commas, with spacing
+PRINT 312, 4, 1, 3111, 3       ' Numbers are printed in tabular form
+PRINT 3, 2344, 12231, 1, 12333 ' Continues the tabular output
+
+' End of program
+END ' This statement marks the end of the QuickBasic program
+
diff --git a/Tutorial/Group 1/04.bas b/Tutorial/Group 1/04.bas
new file mode 100755
index 0000000..dd1a43d
--- /dev/null
+++ b/Tutorial/Group 1/04.bas	
@@ -0,0 +1,17 @@
+' This program prompts the user to enter a number and then prints that number back to the screen.
+' It demonstrates basic input/output operations in QuickBasic.
+
+DEFINT A-Z ' Declare all variables as integers for simplicity
+
+' Declare a variable to store the user's input
+DIM num AS INTEGER
+
+' Use the INPUT statement to prompt the user and read their input
+PRINT "Please enter a number:";
+INPUT num
+
+' Print a message to the screen along with the entered number
+PRINT "You entered: "; num
+
+' End of program
+END
diff --git a/Tutorial/Group 1/05.bas b/Tutorial/Group 1/05.bas
new file mode 100755
index 0000000..5d56b0c
--- /dev/null
+++ b/Tutorial/Group 1/05.bas	
@@ -0,0 +1,26 @@
+REM **** Guess a Number Game ****
+
+DEFINT A-Z ' Define all variables as integers for performance and clarity
+
+' Main game loop
+DO
+    ' Prompt the user to enter a number
+    INPUT "Enter a number between 1 and 10: "; guess
+
+    ' Check if the user guessed the correct number
+    IF guess = 5 THEN
+        ' If the guess is correct, congratulate the user and exit the loop
+        PRINT "Correct!!! You've guessed the secret number."
+        EXIT DO
+    ELSEIF guess < 5 THEN
+        ' If the guess is too low, prompt the user to try a higher number
+        PRINT "Try a bigger number."
+    ELSEIF guess > 5 THEN
+        ' If the guess is too high, prompt the user to try a lower number
+        PRINT "Try a smaller number."
+    END IF
+LOOP
+
+' End of the program
+PRINT "Thank you for playing! Goodbye."
+END
diff --git a/Tutorial/Group 1/06.bas b/Tutorial/Group 1/06.bas
new file mode 100755
index 0000000..4237cf8
--- /dev/null
+++ b/Tutorial/Group 1/06.bas	
@@ -0,0 +1,22 @@
+CLS ' Clear the screen
+
+' This program demonstrates a simple counting loop in QuickBasic.
+' It will print the current value of 'a' and increment it by 1 each time.
+' The loop continues until 'a' is no longer less than 10.
+
+DIM a AS INTEGER ' Declare variable 'a' as an integer
+
+' Initialize the counter variable 'a' to start at 1
+a = 1
+
+' Start of the counting loop
+DO WHILE a < 10
+    ' Print the current value of 'a' with a label
+    PRINT "current:"; a
+
+    ' Increment 'a' by 1
+    a = a + 1
+LOOP
+
+' The program will end after the loop finishes
+END
diff --git a/Tutorial/Group 1/07.bas b/Tutorial/Group 1/07.bas
new file mode 100755
index 0000000..9bb214b
--- /dev/null
+++ b/Tutorial/Group 1/07.bas	
@@ -0,0 +1,12 @@
+' This program demonstrates a simple FOR loop in Microsoft QuickBasic
+
+CLS ' Clears the screen, preparing it for output
+
+' We are about to use a FOR loop to print numbers from 1 to 10
+FOR i = 1 TO 10 ' Initialize a counter variable 'i' starting at 1
+    ' For each iteration of the loop, print the current value of 'i'
+    PRINT "current: "; i ' Outputs the message with the current number
+NEXT i ' Increment 'i' by 1 and repeat the loop until 'i' is no longer less than or equal to 10
+
+' The program has now finished executing and will end
+END ' This marks the end of the QuickBasic program
diff --git a/Tutorial/Group 1/08.bas b/Tutorial/Group 1/08.bas
new file mode 100755
index 0000000..8df64b6
--- /dev/null
+++ b/Tutorial/Group 1/08.bas	
@@ -0,0 +1,23 @@
+' This program demonstrates how to use a FOR loop and the SOUND statement
+' in QuickBasic. It plays a series of tones at increasing frequencies
+' from 100 Hz to 1000 Hz, in steps of 50 Hz, with each tone lasting for
+' one duration unit as defined by the SOUND statement.
+
+CLS ' Clears the screen before starting the program
+
+' Initialize the frequency variable to the starting value
+LET frequency = 100
+
+' Loop from the initial frequency (100 Hz) to the maximum frequency (1000 Hz),
+' increasing by 50 Hz on each iteration
+FOR frequency = 100 TO 1000 STEP 50
+    ' Print the current frequency value to the console
+    PRINT "Current Frequency:"; frequency; " Hz"
+
+    ' Play a sound at the specified frequency and duration
+    ' The SOUND statement takes two arguments: frequency and duration
+    SOUND frequency, 1 ' The duration is set to 1 (shortest possible sound)
+NEXT frequency
+
+' End of program execution
+END
diff --git a/Tutorial/Group 1/09.bas b/Tutorial/Group 1/09.bas
new file mode 100755
index 0000000..1b96f04
--- /dev/null
+++ b/Tutorial/Group 1/09.bas	
@@ -0,0 +1,22 @@
+REM This program demonstrates how to generate random numbers
+REM and use them to create sound effects in QuickBasic.
+
+CLS ' Clear the screen before starting the program
+
+' Define constants for the range of random numbers
+FOR i = 1 TO 20 ' Loop 20 times to generate and play 20 random sounds
+    ' Generate a random floating-point number between LOWER_BOUND and UPPER_BOUND
+    n = RND * 1000
+    ' Print the generated random number to the screen
+    PRINT "Random number: "; n
+
+    ' Play a sound with a frequency based on the random number
+    ' The QuickBasic SOUND statement takes two arguments: frequency and duration
+    ' We add 40 to the random number to shift the frequency range
+    ' so that it is more audible
+    SOUND n + 40, 1 ' Play the sound for a short duration (1/89th of a second)
+
+NEXT i
+
+END ' End the program
+
diff --git a/Tutorial/Group 1/10.bas b/Tutorial/Group 1/10.bas
new file mode 100755
index 0000000..ab4120b
--- /dev/null
+++ b/Tutorial/Group 1/10.bas	
@@ -0,0 +1,25 @@
+' This example program demonstrates how to use the WIDTH and COLOR
+' statements in QuickBasic to change the text font size and text colors.
+
+' Set the text window to a smaller font size suitable for displaying
+' 50 lines of text within an 80-column width.
+WIDTH 80, 50
+
+' Define constants for the number of colors available in standard
+' QuickBasic color palette.
+CONST NumColors = 32
+
+' Loop through all possible colors (0 to 31) and display a message
+' with each color to illustrate the different text color options.
+FOR colorIndex = 0 TO NumColors - 1
+    ' Set the current text color using the COLOR statement.
+    ' Colors range from 0 to 15 are solid, while colors 16 to 31
+    ' will blink slowly or quickly depending on the terminal.
+    COLOR colorIndex
+
+    ' Print a message indicating which color number is currently being used.
+    ' Note that color numbers 16 and above will produce blinking text.
+    PRINT "This is text color number "; colorIndex; "."
+
+NEXT colorIndex
+
diff --git a/Tutorial/Group 1/11.bas b/Tutorial/Group 1/11.bas
new file mode 100755
index 0000000..e6f69e6
--- /dev/null
+++ b/Tutorial/Group 1/11.bas	
@@ -0,0 +1,27 @@
+' This program demonstrates how to use the COLOR statement and LOCATE function
+' in Microsoft QuickBasic to change the text color and cursor position
+' on the console screen.
+
+CLS ' Clears the screen before starting
+
+' Set the text color to yellow (color code 14) and position the cursor
+' at row 1, column 50. Then print a message at that location.
+COLOR 14
+LOCATE 1, 50 ' Sets the cursor location to <row=1, column=50>
+PRINT "Yellow text at 1, 50"
+
+' Change the text color to pink (color code 12) and move the cursor
+' to row 6, column 5. Print a message with the new color and position.
+COLOR 12
+LOCATE 6, 5 ' Sets the cursor location to <row=6, column=5>
+PRINT "Pink text at 6, 5"
+
+' Update the text color to green (color code 10) and set the cursor
+' to row 20, column 40. Display a message at this new location.
+COLOR 10
+LOCATE 20, 40 ' Sets the cursor location to <row=20, column=40>
+PRINT "Green text at 20, 40"
+
+' The program finishes execution here. Users can add more statements
+' below this line to experiment with different colors and positions.
+END ' End of the program
diff --git a/Tutorial/Group 1/12.bas b/Tutorial/Group 1/12.bas
new file mode 100755
index 0000000..3aa9c36
--- /dev/null
+++ b/Tutorial/Group 1/12.bas	
@@ -0,0 +1,24 @@
+' This program demonstrates the use of FOR loops, color manipulation,
+' and string output in QuickBasic. It also shows how to prevent the
+' cursor from moving to a new line after printing a string.
+
+CLS ' Clears the screen before starting the program
+
+' The first loop demonstrates changing text colors using the COLOR statement
+' inside a FOR loop, which iterates from 1 to 15 (the number of available
+' color attributes in QuickBasic).
+FOR ColorIndex = 1 TO 15
+    COLOR ColorIndex ' Set the current text color to the loop index
+    PRINT "This is a test" ' Print the string with the new color
+NEXT ColorIndex
+
+PRINT ' Print a blank line for better readability
+
+' The second loop does the same as the first one, but it uses a semicolon
+' at the end of the PRINT statement to prevent the cursor from moving
+' to the start of a new line after each string output. This results in
+' all strings being printed on the same line.
+FOR ColorIndex = 1 TO 15
+    COLOR ColorIndex ' Change the text color for each iteration
+    PRINT "This is a test"; ' Print the string and keep the cursor on the same line
+NEXT ColorIndex
diff --git a/Tutorial/Group 1/13.bas b/Tutorial/Group 1/13.bas
new file mode 100755
index 0000000..c778556
--- /dev/null
+++ b/Tutorial/Group 1/13.bas	
@@ -0,0 +1,19 @@
+' This example QuickBasic program demonstrates the difference between
+' normal division and integer division with rounding.
+
+CLS                       ' Clears the screen to provide a clean output area
+
+' Perform normal division which results in a floating-point number
+' and print the result
+PRINT "Normal division (70 / 4):"; 70 / 4
+
+' Explain the use of backslash (\) for integer division with rounding
+' Perform integer division with rounding and print the result
+PRINT "Integer division with rounding (70 \ 4):"; 70 \ 4
+
+' Provide a brief conclusion to summarize what was demonstrated
+PRINT
+PRINT "In QuickBasic, '/' performs normal division, while '\' does integer division"
+PRINT "and rounds the result to the nearest whole number."
+
+END                       ' End of program
diff --git a/Tutorial/Group 1/15.bas b/Tutorial/Group 1/15.bas
new file mode 100755
index 0000000..242c221
--- /dev/null
+++ b/Tutorial/Group 1/15.bas	
@@ -0,0 +1,18 @@
+' This program demonstrates the use of nested FOR loops in QuickBasic
+' to draw a simple pattern on the screen.
+
+CLS ' Clears the screen and prepares for output
+
+' Outer loop will run 15 times, representing rows
+FOR row = 1 TO 15
+
+    ' Inner loop will run 60 times, representing columns within each row
+    FOR column = 1 TO 60
+        PRINT "#"; ' Print a '#' character followed by no space to create a continuous line
+    NEXT column
+
+    ' After completing one row, print a newline character to move to the next line
+    PRINT
+
+NEXT row
+
diff --git a/Tutorial/Group 1/16.bas b/Tutorial/Group 1/16.bas
new file mode 100755
index 0000000..71f1eaf
--- /dev/null
+++ b/Tutorial/Group 1/16.bas	
@@ -0,0 +1,34 @@
+' QuickBasic example program to demonstrate the use of nested loops
+' and how to control the flow of a loop using the STEP keyword.
+
+CLS ' Clears the screen before starting the program
+
+' This outer loop will iterate from 1 to 10
+FOR b = 1 TO 10
+    ' The inner loop will print "A" b times, where b is the current
+    ' value of the outer loop iterator
+    FOR a = 1 TO b
+        PRINT "A"; ' Print "A" followed by a semicolon to prevent newline
+    NEXT a
+
+    ' After each inner loop iteration, print a newline to start the next line
+    PRINT
+NEXT b
+
+' Print a blank line to separate the two parts of the demonstration
+PRINT
+
+' This outer loop will iterate from 60 to 0, decrementing by 8 each time
+FOR b = 60 TO 0 STEP -8
+    ' The inner loop will print "B" b times, where b is the current
+    ' value of the outer loop iterator
+    FOR a = 1 TO b
+        PRINT "B"; ' Print "B" followed by a semicolon to prevent newline
+    NEXT a
+
+    ' After each inner loop iteration, print a newline to start the next line
+    PRINT
+NEXT b
+
+' End of the program
+END
diff --git a/Tutorial/Group 1/17.bas b/Tutorial/Group 1/17.bas
new file mode 100755
index 0000000..b5e5f35
--- /dev/null
+++ b/Tutorial/Group 1/17.bas	
@@ -0,0 +1,31 @@
+' This example QuickBasic program demonstrates how to use the built-in
+' timer, as well as how to display the current system time and date.
+' It also shows a simple loop structure and the use of the CLS statement
+' to clear the screen.
+
+' To stop the program, press CTRL + PAUSE/BREAK.
+
+DO
+    ' Clear the screen to provide a clean display for each iteration.
+    CLS
+
+    ' Retrieve and print the current value of the system timer.
+    ' The TIMER function returns the number of seconds that have
+    ' elapsed since midnight, not counting leap seconds.
+    PRINT "System Timer: "; TIMER; " seconds since midnight."
+
+    ' Retrieve and print the current system time using TIME$.
+    ' TIME$ returns a string in the format "HH:MM:SS".
+    PRINT "Current System Time: "; TIME$; "."
+
+    ' Retrieve and print the current system date using DATE$.
+    ' DATE$ returns a string in the format "M/D/YYYY" or "DD/MM/YYYY"
+    ' depending on regional settings.
+    PRINT "Current System Date: "; DATE$; "."
+
+    ' Pause for a moment to allow the user to see the output before
+    ' it is cleared again in the next iteration of the loop.
+    ' The Sleep statement requires including the QB.BI library.
+    SLEEP 1
+
+LOOP
diff --git a/Tutorial/Group 1/18.bas b/Tutorial/Group 1/18.bas
new file mode 100755
index 0000000..0aec40a
--- /dev/null
+++ b/Tutorial/Group 1/18.bas	
@@ -0,0 +1,31 @@
+' This example program demonstrates the use of the RND function
+' to generate random numbers in Microsoft QuickBasic.
+
+' Clear the screen before starting the program
+CLS
+
+' The first loop will print ten random numbers. However, these
+' numbers may not seem truly random because the random number
+' generator needs to be seeded with a varying value.
+
+PRINT "First group of 'random' numbers without seeding:"
+FOR b = 1 TO 10
+    PRINT RND
+NEXT b
+
+' Print an empty line for better readability between the two groups
+PRINT
+
+' Seed the random number generator using the TIMER function, which
+' returns the number of seconds since midnight. This ensures that
+' subsequent calls to RND will yield different sequences of numbers
+' each time the program is run after being restarted.
+RANDOMIZE TIMER
+PRINT "Second group of truly random numbers with seeding:"
+
+' Now, print another ten random numbers after seeding the generator
+FOR b = 1 TO 10
+    PRINT RND
+NEXT b
+
+' End of program
diff --git a/Tutorial/Group 1/19.bas b/Tutorial/Group 1/19.bas
new file mode 100755
index 0000000..536364b
--- /dev/null
+++ b/Tutorial/Group 1/19.bas	
@@ -0,0 +1,31 @@
+' This program demonstrates how to use the QuickBasic functions RND (random number generator),
+' COLOR (sets text and background color), LOCATE (positions the cursor on the screen), PRINT (displays text),
+' SOUND (generates a tone through the PC speaker)
+
+CLS ' Clears the screen before starting the program
+
+' Generate random coordinates (x, y) for text placement on the screen
+' and a random color (c) for the text.
+' The screen has 80 columns (0-79) and 25 lines (0-24), but we start counting from 1.
+
+
+' INKEY$ returns a string containing any keystroke; if no key is pressed, it returns an empty string
+DO WHILE INKEY$ = ""
+    x = INT(RND * 80) + 1  ' Random column, ensuring it is within the screen width
+    y = INT(RND * 25) + 1  ' Random line, ensuring it is within the screen height
+    c = INT(RND * 16)      ' Random color index (0-15), where 0 is black and 15 is white
+
+    ' Set the text color to the randomly chosen color
+    COLOR c
+
+    ' Position the cursor at the random coordinates
+    LOCATE y, x
+
+    ' Print an "x" character at the current cursor position
+    PRINT "x"; ' The semicolon prevents advancing to the next line
+
+    ' Generate a sound with a frequency based on the x coordinate and a duration of 0.1 seconds
+    SOUND x * 100 + 100, 1
+
+LOOP
+
diff --git a/Tutorial/Group 2/01.bas b/Tutorial/Group 2/01.bas
new file mode 100755
index 0000000..d3f31ae
--- /dev/null
+++ b/Tutorial/Group 2/01.bas	
@@ -0,0 +1,38 @@
+CLS
+
+' This program demonstrates how to use the SOUND statement in QuickBasic
+' to play tones with varying frequency and duration.
+
+' Play a sequence of tones with increasing frequency
+' Each tone has a fixed duration of 2 time units
+PRINT "Playing tones with increasing frequency:"
+SOUND 1000, 2          ' Play a tone at 1000 Hz for 2 time units
+SOUND 2000, 2          ' Play a tone at 2000 Hz for 2 time units
+SOUND 3000, 2          ' Play a tone at 3000 Hz for 2 time units
+
+' Wait for 10 time units to create a pause
+PRINT "Pausing for 10 time units..."
+SOUND 0, 10            ' Pause for 10 time units (silence)
+
+' Play a sequence of tones with a fixed frequency
+' Each tone has an increasing duration
+PRINT "Playing tones with fixed frequency and increasing length:"
+SOUND 1000, 1          ' Play a tone at 1000 Hz for 1 time unit
+SOUND 0, 10            ' Pause for 10 time units (silence)
+
+SOUND 1000, 2          ' Play a tone at 1000 Hz for 2 time units
+SOUND 0, 10            ' Pause for 10 time units (silence)
+
+SOUND 1000, 4          ' Play a tone at 1000 Hz for 4 time units
+SOUND 0, 10            ' Pause for 10 time units (silence)
+
+SOUND 1000, 8          ' Play a tone at 1000 Hz for 8 time units
+SOUND 0, 10            ' Pause for 10 time units (silence)
+
+' Notes:
+' - The SOUND statement takes two arguments: frequency and duration.
+' - Frequency is specified in Hertz (Hz), and duration is specified in time units.
+' - A frequency of 0 results in silence, which can be used to create pauses.
+' - Time units are not precisely defined by QuickBasic and may vary depending
+'   on the hardware and system configuration. They provide a relative measure
+'   for timing musical tones.
diff --git a/Tutorial/Group 2/02.bas b/Tutorial/Group 2/02.bas
new file mode 100755
index 0000000..4495c79
--- /dev/null
+++ b/Tutorial/Group 2/02.bas	
@@ -0,0 +1,26 @@
+' Simple Sound Sweep Program
+
+' Start label for infinite loop
+beginLoop:
+
+' Increase speed on each pass - this controls how quickly frequencies change
+speed = speed + 1
+
+' Show current speed multiplier to user
+PRINT speed; "x"
+
+' Forward frequency sweep from 100Hz to 1000Hz
+FOR currentFrequency = 100 TO 1000 STEP speed
+  ' Create sound with current frequency for 0.1 seconds
+  ' SOUND format: SOUND frequency, duration
+  SOUND currentFrequency, .1
+NEXT currentFrequency
+
+' Reverse frequency sweep from 1000Hz to 100Hz
+FOR currentFrequency = 1000 TO 100 STEP -speed
+  ' Create sound with current frequency for 0.1 seconds
+  SOUND currentFrequency, .1
+NEXT currentFrequency
+
+' Jump back to beginning for continuous effect
+GOTO beginLoop
diff --git a/Tutorial/Group 2/03.bas b/Tutorial/Group 2/03.bas
new file mode 100755
index 0000000..c2bba1e
--- /dev/null
+++ b/Tutorial/Group 2/03.bas	
@@ -0,0 +1,16 @@
+' This program demonstrates basic user input and string manipulation in QuickBasic.
+' It greets the user by name and asks how they are doing, using colors to enhance the output.
+
+CLS ' Clears the screen to provide a clean start for the program.
+
+' Prompt the user for their name and store it in a variable called userName$.
+INPUT "Hi, what is your name: ", userName$
+
+' Set the text color to a bright green (color code 10) for a pleasant visual effect.
+COLOR 10
+
+' Greet the user by printing "Hello" followed by their name and an exclamation mark.
+PRINT "Hello " + userName$ + "!"
+
+' Ask the user how they are doing by appending their name to the question.
+PRINT userName$ + ", how are you?"
diff --git a/Tutorial/Group 2/04.bas b/Tutorial/Group 2/04.bas
new file mode 100755
index 0000000..2ef6a57
--- /dev/null
+++ b/Tutorial/Group 2/04.bas	
@@ -0,0 +1,13 @@
+CLS
+
+' Initialize the string variable with "-two-"
+stringValue$ = "-two-"
+PRINT stringValue$
+
+' Append "three" to the existing string
+stringValue$ = stringValue$ + "three"
+PRINT stringValue$
+
+' Prepend "one" to the string to form a complete sequence
+stringValue$ = "one" + stringValue$
+PRINT stringValue$
diff --git a/Tutorial/Group 2/05.bas b/Tutorial/Group 2/05.bas
new file mode 100755
index 0000000..031f8d4
--- /dev/null
+++ b/Tutorial/Group 2/05.bas	
@@ -0,0 +1,52 @@
+CLS
+
+' This program creates a simple text-based box in the console window.
+' The user specifies the horizontal and vertical size of the box within
+' certain constraints to ensure it fits on the screen.
+
+' Prompt the user for the horizontal size of the box (between 2 and 79)
+INPUT "Enter the Horizontal Size of the Box (2 to 79): ", hs
+
+' Validate the horizontal size input
+WHILE hs < 2 OR hs > 79
+    PRINT "Invalid input. Please enter a number between 2 and 79."
+    INPUT "Enter the Horizontal Size of the Box (2 to 79): ", hs
+WEND
+
+' Prompt the user for the vertical size of the box (between 2 and 23)
+INPUT "Enter the Vertical Size of the Box (2 to 23): ", vs
+
+' Validate the vertical size input
+WHILE vs < 2 OR vs > 23
+    PRINT "Invalid input. Please enter a number between 2 and 23."
+    INPUT "Enter the Vertical Size of the Box (2 to 23): ", vs
+WEND
+
+' Draw the top line of the box
+FOR i = 1 TO hs
+    PRINT "#";
+NEXT i
+PRINT
+
+' Draw the middle section of the box
+FOR y = 1 TO vs - 2
+    ' Print the left side of the box
+    PRINT "#";
+
+    ' Print the interior of the box
+    FOR i = 1 TO hs - 2
+        PRINT ".";
+    NEXT i
+
+    ' Print the right side of the box
+    PRINT "#"
+NEXT y
+
+' Draw the bottom line of the box
+FOR i = 1 TO hs
+    PRINT "#";
+NEXT i
+PRINT
+
+' The program has finished drawing the box and now ends
+END
diff --git a/Tutorial/Group 2/06.bas b/Tutorial/Group 2/06.bas
new file mode 100755
index 0000000..d7f192d
--- /dev/null
+++ b/Tutorial/Group 2/06.bas	
@@ -0,0 +1,5 @@
+' several commans may be at the single line, when separated by colon.
+
+1 a = a + 1: PRINT a; "x 7 ="; a * 7: IF a < 10 THEN GOTO 1
+
+
diff --git a/Tutorial/Group 2/07.bas b/Tutorial/Group 2/07.bas
new file mode 100755
index 0000000..afe3d37
--- /dev/null
+++ b/Tutorial/Group 2/07.bas	
@@ -0,0 +1,36 @@
+REM This program demonstrates basic input/output and conditional logic in QuickBasic.
+REM It prompts the user to enter a number and then evaluates that number
+REM with respect to the value 5 using various comparison operators.
+
+PRINT "Please enter a number:"
+INPUT n
+
+REM Check if the number is less than 5
+IF n < 5 THEN
+    PRINT "The number you entered is smaller than 5."
+END IF
+
+REM Check if the number is greater than 5
+IF n > 5 THEN
+    PRINT "The number you entered is greater than 5."
+END IF
+
+REM Check if the number is exactly equal to 5
+IF n = 5 THEN
+    PRINT "The number you entered is equal to 5."
+END IF
+
+REM Check if the number is less than or equal to 5
+IF n <= 5 THEN
+    PRINT "The number you entered is 5, or less."
+END IF
+
+REM Check if the number is greater than or equal to 5
+IF n >= 5 THEN
+    PRINT "The number you entered is 5, or greater."
+END IF
+
+REM Check if the number is not equal to 5
+IF n <> 5 THEN
+    PRINT "The number you entered is not 5."
+END IF
diff --git a/Tutorial/Group 2/08.bas b/Tutorial/Group 2/08.bas
new file mode 100755
index 0000000..930bea8
--- /dev/null
+++ b/Tutorial/Group 2/08.bas	
@@ -0,0 +1,80 @@
+CLS
+
+' This program simulates a login prompt for a nuclear rocket control system.
+' It asks the user to enter a password and checks if the entered password is correct.
+' If the password is incorrect, it prompts the user again.
+
+' Define a constant for the correct password for better security practices
+CONST CorrectPassword = "jerry"
+
+' Function to display the welcome message
+SUB DisplayWelcomeMessage
+    LOCATE 1, 1
+    COLOR 14
+    PRINT "          ========================================"
+    PRINT "          Welcome to nuclear rocket control system"
+    PRINT "          ========================================"
+END SUB
+
+' Function to display the rocket artwork
+SUB DisplayRocketArt
+    COLOR 10, 1
+    PRINT "..............................................................."
+    PRINT ".....MMMMMM................MM...MMMMMMM.MMMMMM.MMM..MMMMMMM..MM"
+    PRINT "MMMMMMMMMMMMMMM...MM.M....MMMMM.MM.MMMMMMMMMMMMMMMMMMMMMMM.MM.."
+    PRINT ".MMMMMMMMMMM.M.....MMM...MM.....MMMMMMMMMMMMMMMMMMMMMM.M......."
+    PRINT "..MMMMMMMMMMMM..............MMMMMMMMMMMMMMMMMMMMMMMMMM..M ....."
+    PRINT "....MMMMMMMM...............MMMM..MMMMM.MMMMMMMMMMMMM.MM........"
+    PRINT ".....MMMMMMM.............MMMMMMMM..MMM..MMMMMM.MMMMM.M........."
+    PRINT "........MM...............MMMMMMMMMM.M.....MM...........M......."
+    PRINT "......MMMMMM................MMMMMMM....................M......."
+    PRINT ".....MMMMMMMM.................MMMMMM....................MMM...."
+    PRINT "......MMMMMMM.................MMMMM...................MMMMMM..."
+    PRINT "........MMMMMM..................MM....................MMMMMMM.."
+    PRINT "..........MMMMM ...........................................MM.."
+END SUB
+
+' Function to play a simple tune
+SUB PlayTune
+    FOR a = 9 TO 23
+        SOUND 1.5 ^ a, 3
+    NEXT a
+END SUB
+
+' Main program execution starts here
+DO
+    ' Clear the screen and prompt the user for the password
+    CLS
+    COLOR 7
+    PRINT "Enter password: ";
+
+    ' Temporarily set text color to black to hide the password input
+    COLOR 0
+    INPUT "", UserPassword$
+
+    ' Restore original text color
+    COLOR 7
+LOOP UNTIL UserPassword$ = CorrectPassword
+
+' Clear the screen for the welcome message
+CLS
+
+' Call the function to display the welcome message
+DisplayWelcomeMessage
+
+' Call the function to display the rocket artwork
+DisplayRocketArt
+
+' Locate and display our location with a special color
+LOCATE 7, 34
+COLOR 12 + 16
+PRINT "*"
+
+' Play the simple tune using the sound command
+PlayTune
+
+' Restore default text color
+COLOR 7, 0
+
+' End of the program
+END
diff --git a/Tutorial/Group 2/09.bas b/Tutorial/Group 2/09.bas
new file mode 100755
index 0000000..2e99357
--- /dev/null
+++ b/Tutorial/Group 2/09.bas	
@@ -0,0 +1,21 @@
+' This program demonstrates the use of string manipulation functions
+' in Microsoft QuickBasic. It shows how to extract substrings from a
+' given string using the LEFT$ and RIGHT$ functions.
+
+DEFSTR A-Z    ' Define all variables as strings to avoid type mismatches
+
+' Initialize a string variable with the value "software"
+SoftwareName$ = "software"
+
+' Print the full name of the software
+PRINT "Full software name: "; SoftwareName$
+
+' Extract and print the first four characters from the left of the string
+LEFTPart$ = LEFT$(SoftwareName$, 4)      ' Get the leftmost substring
+PRINT "Left part (first 4 characters): "; LEFTPart$
+
+' Extract and print the last four characters from the right of the string
+RIGHTPart$ = RIGHT$(SoftwareName$, 4)     ' Get the rightmost substring
+PRINT "Right part (last 4 characters): "; RIGHTPart$
+
+END    ' End of program
diff --git a/Tutorial/Group 2/10.bas b/Tutorial/Group 2/10.bas
new file mode 100755
index 0000000..5df3e41
--- /dev/null
+++ b/Tutorial/Group 2/10.bas	
@@ -0,0 +1,37 @@
+CLS
+
+' This program demonstrates basic user input and string manipulation in QuickBasic.
+
+' Prompt the user to enter some text and store it in a variable called 'userInput$'.
+INPUT "Enter some text: ", userInput$
+
+' Print the text that the user entered in three different ways:
+' 1. Concatenating the prompt with the entered text using the '+' operator.
+' 2. Using a comma to separate the prompt from the entered text, which is more efficient.
+' 3. Using a colon to print on the same line without a space between the prompt and the input.
+PRINT "You entered: " + userInput$
+
+' Calculate the length of the entered text using the LEN function.
+' Then, print out the length, formatting it as a sentence.
+PRINT "Its length is" + STR$(LEN(userInput$)) + " characters."
+
+' Use a FOR loop to iterate from 1 to the length of the user input.
+' In each iteration, extract a substring from the left using the LEFT$ function
+' and print it to demonstrate string extraction from the beginning.
+FOR index = 1 TO LEN(userInput$)
+    PRINT "Leftmost " + STR$(index) + " character(s): " + LEFT$(userInput$, index)
+NEXT index
+
+' Print a blank line for better readability of the output.
+PRINT
+
+' Similar to the previous loop, but now we use the RIGHT$ function to extract
+' substrings from the right end of the user input, demonstrating string extraction
+' from the end of the string.
+FOR index = 1 TO LEN(userInput$)
+    PRINT "Rightmost " + STR$(index) + " character(s): " + RIGHT$(userInput$, index)
+NEXT index
+
+' End of the program.
+END
+
diff --git a/Tutorial/Group 2/11.bas b/Tutorial/Group 2/11.bas
new file mode 100755
index 0000000..ef910ae
--- /dev/null
+++ b/Tutorial/Group 2/11.bas	
@@ -0,0 +1,19 @@
+' Simple Character Extractor Program
+' This program takes user input and prints each character individually
+
+CLS
+
+' Get user input
+INPUT "Enter some text:", userInput$
+
+' Process each character in the input string
+FOR charPosition = 1 TO LEN(userInput$)
+  ' Get the left portion of the string up to current position
+  leftPortion$ = LEFT$(userInput$, charPosition)
+
+  ' Extract the current character (rightmost character of left portion)
+  currentChar$ = RIGHT$(leftPortion$, 1)
+
+  ' Print the current character with label
+  PRINT "letter:"; currentChar$
+NEXT charPosition
diff --git a/Tutorial/Group 2/12.bas b/Tutorial/Group 2/12.bas
new file mode 100755
index 0000000..28b738d
--- /dev/null
+++ b/Tutorial/Group 2/12.bas	
@@ -0,0 +1,45 @@
+' This program demonstrates the basics of animation and control flow in QuickBasic.
+' It shows a simple text bouncing up and down on the screen, simulating a "jumping" effect.
+
+' Declare variables with descriptive names to hold the position and movement direction
+DIM yPosition AS INTEGER ' Current vertical position of the text
+DIM ySpeed AS INTEGER   ' Vertical speed (or direction) of the text
+
+' Initialize the starting position and speed
+yPosition = 10
+ySpeed = 1
+
+' Main animation loop
+DO
+    ' Clear the screen before drawing the next frame
+    CLS
+
+    ' Update the vertical position based on the current speed
+    yPosition = yPosition + ySpeed
+
+    ' Check if the text has hit the top boundary and change direction if it has
+    IF yPosition > 20 THEN
+        ySpeed = -1
+    ENDIF
+
+    ' Check if the text has hit the bottom boundary and change direction if it has
+    IF yPosition < 2 THEN
+        ySpeed = 1
+    ENDIF
+
+    ' Set the cursor position to the current vertical position
+    LOCATE yPosition
+
+    ' Print the "jumping" text at the new position
+    PRINT "This is jumping text";
+
+    ' Play a sound with a frequency that varies based on the vertical position
+    ' The frequency is calculated to give an audible effect as the text jumps
+    SOUND yPosition * 200 + 100, 1
+
+    ' Pause briefly before drawing the next frame (adjust this value for faster or slower animation)
+    DELAY 0.1
+LOOP
+
+' Note: The program will run indefinitely due to the DO LOOP structure.
+' To stop the program, you can press Ctrl+Break on most systems.
diff --git a/Tutorial/Group 2/13.bas b/Tutorial/Group 2/13.bas
new file mode 100755
index 0000000..c7c507a
--- /dev/null
+++ b/Tutorial/Group 2/13.bas	
@@ -0,0 +1,54 @@
+' This program demonstrates basic animation and boundary checking in QuickBasic.
+' It simulates a simple ball bouncing around the screen.
+
+CLS ' Clear the screen before starting the animation
+
+' Initialize variables representing the ball's position and velocity
+DIM x AS INTEGER ' Ball's X coordinate
+DIM y AS INTEGER ' Ball's Y coordinate
+DIM xs AS INTEGER ' Ball's speed in the X direction
+DIM ys AS INTEGER ' Ball's speed in the Y direction
+
+x = 12 ' Initial X position of the ball
+y = 7  ' Initial Y position of the ball
+xs = 1  ' Initial velocity in the X direction (rightward)
+ys = 1  ' Initial velocity in the Y direction (downward)
+
+' Main animation loop
+DO
+    ' Erase the ball at its current position by printing a space
+    LOCATE y, x: PRINT " ";
+
+    ' Update the ball's position based on its velocities
+    x = x + xs
+    y = y + ys
+
+    ' Draw the ball at its new position
+    LOCATE y, x: PRINT "O";
+
+    ' Check if the ball hits the right or left boundaries and reverse X velocity
+    IF x >= 79 THEN
+        xs = -1
+        SOUND 1000, 1 ' Play a sound when hitting the boundary
+    END IF
+    IF x <= 1 THEN
+        xs = 1
+        SOUND 1000, 1 ' Play a sound when hitting the boundary
+    END IF
+
+    ' Check if the ball hits the bottom or top boundaries and reverse Y velocity
+    IF y >= 22 THEN
+        ys = -1
+        SOUND 1000, 1 ' Play a sound when hitting the boundary
+    END IF
+    IF y <= 1 THEN
+        ys = 1
+        SOUND 1000, 1 ' Play a sound when hitting the boundary
+    END IF
+
+    ' Pause briefly to control the speed of the animation
+    SOUND 0, 1
+LOOP
+
+' The program will continue running indefinitely, creating an animated bouncing ball effect
+
diff --git a/Tutorial/Group 2/14.bas b/Tutorial/Group 2/14.bas
new file mode 100755
index 0000000..4a0f1f9
--- /dev/null
+++ b/Tutorial/Group 2/14.bas	
@@ -0,0 +1,54 @@
+' This program demonstrates how to use the SOUND statement in QuickBasic
+' to produce different tones when pressing keys "0" through "9".
+' It also shows how to exit the program by pressing the Escape key.
+
+CLS
+PRINT "Press keys '0'-'9' for different sounds."
+PRINT "Press Esc to exit the program."
+
+' Start an infinite loop to continuously check for user input
+DO
+    ' Read a single character from the keyboard
+    a$ = INPUT$(1)
+
+    ' Play a sound corresponding to the key pressed
+    SELECT CASE a$
+        CASE "0"
+            ' Generate a low-pitched tone
+            SOUND 1900, 2
+        CASE "1"
+            ' Generate a slightly higher pitched tone
+            SOUND 1000, 2
+        CASE "2"
+            ' Generate a tone with a frequency of 1100 Hz
+            SOUND 1100, 2
+        CASE "3"
+            ' Generate a tone with a frequency of 1200 Hz
+            SOUND 1200, 2
+        CASE "4"
+            ' Generate a tone with a frequency of 1300 Hz
+            SOUND 1300, 2
+        CASE "5"
+            ' Generate a tone with a frequency of 1400 Hz
+            SOUND 1400, 2
+        CASE "6"
+            ' Generate a tone with a frequency of 1500 Hz
+            SOUND 1500, 2
+        CASE "7"
+            ' Generate a high-pitched tone
+            SOUND 1600, 2
+        CASE "8"
+            ' Generate a very high-pitched tone
+            SOUND 1700, 2
+        CASE "9"
+            ' Generate the highest pitched tone available
+            SOUND 1800, 2
+        CASE CHR$(27)
+            ' Check if the Escape key is pressed to exit the program
+            SYSTEM
+        CASE ELSE
+            ' If any other key is pressed, do nothing
+    END SELECT
+
+    ' Loop indefinitely until the user decides to exit
+LOOP
diff --git a/Tutorial/Group 2/15.bas b/Tutorial/Group 2/15.bas
new file mode 100755
index 0000000..0f8b2b8
--- /dev/null
+++ b/Tutorial/Group 2/15.bas	
@@ -0,0 +1,26 @@
+' This program demonstrates how to use a FOR loop and the CHR$ function
+' in QuickBasic to print out characters from the ASCII table.
+
+CLS ' Clears the screen before printing
+
+' The FOR loop iterates over ASCII values starting from 32 (space character)
+' up to 255, which is beyond the standard ASCII range but includes extended
+' ASCII characters in QuickBasic.
+FOR a = 32 TO 255
+    ' CHR$ function converts an ASCII value to its corresponding character
+    PRINT " " + CHR$(a); ' Prints each character with a leading space for readability
+NEXT a
+
+' Print two new lines to separate the ASCII table from the greeting message
+PRINT
+PRINT
+
+' Greet the user in a friendly manner
+' The CHR$(1) represents the Start of Header (SOH) control character, which is
+' typically not visible and may be interpreted differently depending on the
+' environment. It is used here for demonstration purposes to show how
+' non-printable characters can be included in strings.
+PRINT "Hi there! " + CHR$(1)
+
+' End of the program
+END
diff --git a/Tutorial/Group 2/16.bas b/Tutorial/Group 2/16.bas
new file mode 100755
index 0000000..3ff22a5
--- /dev/null
+++ b/Tutorial/Group 2/16.bas	
@@ -0,0 +1,40 @@
+' This program demonstrates how to capture and process keyboard input in QuickBASIC.
+' It listens for a key press, then prints out the character and its ASCII code.
+' Special keys like Escape, Enter, Backspace, Tabulator, and Space are given custom names.
+
+CLS ' Clears the screen before starting the program
+PRINT "Press any key..." ' Prompts the user to press a key
+
+' Main loop starts here
+DO
+    ' Capture a single character of input from the user
+    a$ = INPUT$(1)
+
+    ' Print the pressed key, if it is a printable character (ASCII code > 32)
+    PRINT "Pressed key was: ";
+    IF ASC(a$) > 32 THEN
+        PRINT a$
+    END IF
+
+    ' Check for special keys and print their names
+    SELECT CASE ASC(a$)
+        CASE 27 ' ASCII code for Escape key
+            PRINT "Escape"
+        CASE 13 ' ASCII code for Enter key
+            PRINT "Enter"
+        CASE 8 ' ASCII code for Backspace key
+            PRINT "Backspace"
+        CASE 9 ' ASCII code for Tabulator key
+            PRINT "Tabulator"
+        CASE 32 ' ASCII code for Space key
+            PRINT "Space"
+        CASE ELSE
+            ' If the key is not special, print its ASCII character
+            IF ASC(a$) > 32 THEN
+                PRINT a$
+            END IF
+    END SELECT
+
+    ' Print the ASCII code of the pressed key
+    PRINT "ASCII code is: "; ASC(a$)
+LOOP ' Continue listening for more key presses
diff --git a/Tutorial/Group 2/17.bas b/Tutorial/Group 2/17.bas
new file mode 100755
index 0000000..899390e
--- /dev/null
+++ b/Tutorial/Group 2/17.bas	
@@ -0,0 +1,58 @@
+' This program demonstrates how to handle keyboard input in QuickBasic
+' and move a character around the screen using the numeric keypad.
+
+CLS
+
+' Inform the user about the controls and how to exit the program
+PRINT "Use keys 4, 8, 6, 2 for movement, make sure the NumLock is on"
+PRINT "ESC to exit"
+
+' Clear a line for better visibility
+PRINT " "
+
+' Wait for the user to press any key to start
+PRINT "Press any key to continue..."
+a$ = INPUT$(1)
+
+' Set the text color to bright yellow
+COLOR 14
+
+' Initialize the starting position of the character
+x = 40
+y = 10
+
+' Main loop for handling input and drawing the character
+DO
+    CLS ' Clear the screen before redrawing
+
+    ' Set the cursor position to the current character coordinates
+    LOCATE y, x
+
+    ' Print the character at the current position
+    PRINT CHR$(2); ' The semicolon prevents moving to the next line
+
+    ' Read a single character of input without waiting
+    a$ = INPUT$(1)
+
+    ' Check for movement inputs and update the character's position
+    SELECT CASE a$
+        CASE "4" ' Left arrow
+            x = x - 1
+        CASE "6" ' Right arrow
+            x = x + 1
+        CASE "8" ' Up arrow
+            y = y - 1
+        CASE "2" ' Down arrow
+            y = y + 1
+        CASE CHR$(27) ' Escape key
+            ' Exit the program
+            SYSTEM
+    END SELECT
+
+    ' Prevent the character from going off-screen
+    IF x < 1 THEN x = 1
+    IF x > 80 THEN x = 80
+    IF y < 1 THEN y = 1
+    IF y > 25 THEN y = 25
+
+LOOP ' Continue the main loop indefinitely
diff --git a/Tutorial/Group 2/18.bas b/Tutorial/Group 2/18.bas
new file mode 100755
index 0000000..9700d82
--- /dev/null
+++ b/Tutorial/Group 2/18.bas	
@@ -0,0 +1,56 @@
+CLS
+
+' Main program loop starts here
+DO
+    ' Clear the screen and print the menu options
+    CLS
+    PRINT "******** Select action: ********"
+    PRINT " "
+    PRINT "1 - Exit program"
+    PRINT "2 - Make a sound"
+    PRINT "3 - Draw a box"
+
+    ' Prompt the user to enter their choice and store it in variable 'userChoice'
+    INPUT "Enter your choice (1-3): ", userChoice
+
+    ' Exit the program if the user chooses option 1
+    IF userChoice = 1 THEN
+        PRINT "Exiting program..."
+        EXIT DO
+    END IF
+
+    ' Play a sound if the user chooses option 2
+    IF userChoice = 2 THEN
+        ' Generate a sound with a frequency of 2000 Hz for 2 seconds
+        SOUND 2000, 2
+
+    ' Draw a box if the user chooses option 3
+    ELSEIF userChoice = 3 THEN
+        ' Outer loop to draw the top and bottom edges of the box
+        FOR row = 1 TO 15
+            ' Inner loop to draw the left and right edges of the box
+            FOR col = 1 TO 50
+                PRINT "#";
+            NEXT col
+            ' Move to the next line after drawing each row
+            PRINT
+        NEXT row
+
+    ' Inform the user if they have entered a number greater than 3
+    ELSEIF userChoice > 3 THEN
+        PRINT "Number too large. Please enter a value between 1 and 3."
+
+    ' Inform the user if they have entered a number less than 1
+    ELSEIF userChoice < 1 THEN
+        PRINT "Number too small. Please enter a value between 1 and 3."
+    END IF
+
+    ' Wait for the user to press a key before continuing
+    PRINT "Press any key to continue..."
+    WHILE INKEY$ = ""
+        ' Do nothing, just wait for a key press
+    WEND
+
+LOOP WHILE TRUE
+
+' End of program
diff --git a/Tutorial/Group 3/00.bas b/Tutorial/Group 3/00.bas
new file mode 100755
index 0000000..c01682c
--- /dev/null
+++ b/Tutorial/Group 3/00.bas	
@@ -0,0 +1,21 @@
+' This program demonstrates how to set the video mode to 320x200 with 256 colors
+' and how to draw a single point on the screen using QuickBasic.
+
+SCREEN 13 ' Set video mode to 320 x 200 with 256 colors
+
+' Greet the user with a simple message
+PRINT "Hello..."
+
+' Define constants for the center of the screen for readability
+CONST CenterX = 160
+CONST CenterY = 100
+
+' Draw a point on the screen at the defined center coordinates
+' with a specified color.
+PSET (CenterX, CenterY), 10 ' Draws a point at (x=160, y=100) with color 10
+
+' Wait for a key press before exiting the program
+PRINT "Press any key to exit..."
+WHILE INKEY$ = ""
+    ' Do nothing until a key is pressed
+WEND
diff --git a/Tutorial/Group 3/01.bas b/Tutorial/Group 3/01.bas
new file mode 100755
index 0000000..2575df0
--- /dev/null
+++ b/Tutorial/Group 3/01.bas	
@@ -0,0 +1,18 @@
+' QuickBasic example program to demonstrate drawing pixels on the screen
+' and generating simple sound with varying frequency.
+
+SCREEN 13 ' Set the graphics mode to 320x200 resolution with 256 colors
+
+' Loop to draw a vertical line of pixels from y-coordinate 50 to 150
+FOR y = 50 TO 150
+    ' Loop to draw a horizontal line of pixels from x-coordinate 100 to 200
+    FOR x = 100 TO 200
+        PSET (x, y), 10 ' Set the pixel at (x, y) to color 10
+    NEXT x
+
+    ' Generate a sound with a frequency corresponding to the y-coordinate
+    ' The SOUND statement takes two arguments: frequency and duration
+    ' Here, the frequency is set to the current value of y, and the duration
+    ' is set to 1 tick (approximately 1/18th of a second)
+    SOUND y, 1
+NEXT y
diff --git a/Tutorial/Group 3/02.bas b/Tutorial/Group 3/02.bas
new file mode 100755
index 0000000..adf3b10
--- /dev/null
+++ b/Tutorial/Group 3/02.bas	
@@ -0,0 +1,27 @@
+' This program demonstrates how to create a simple drawing application
+' using Microsoft QuickBasic. It defines a subroutine called 'box' that
+' draws a rectangle on the screen with specified coordinates and color.
+
+' Declare the 'box' subroutine so it can be used in the main program
+DECLARE SUB box (x1 AS SINGLE, y1 AS SINGLE, x2 AS SINGLE, y2 AS SINGLE, c AS INTEGER)
+
+' Set the screen mode to 13h which is a 320x200 pixel graphics mode with 256 colors
+SCREEN 13
+
+' Draw three boxes on the screen using the 'box' subroutine
+' Each box has different starting and ending coordinates as well as color
+box 10, 10, 100, 100, 15
+box 30, 80, 300, 120, 11
+box 140, 20, 180, 180, 10
+
+' Define the 'box' subroutine
+SUB box (x1 AS SINGLE, y1 AS SINGLE, x2 AS SINGLE, y2 AS SINGLE, c AS INTEGER)
+    ' Use nested FOR loops to iterate over every pixel within the rectangle
+    DIM x AS SINGLE, y AS SINGLE
+    FOR y = y1 TO y2
+        FOR x = x1 TO x2
+            ' Set the color of the current pixel to the specified color 'c'
+            PSET (x, y), c
+        NEXT x
+    NEXT y
+END SUB
diff --git a/Tutorial/Group 3/03.bas b/Tutorial/Group 3/03.bas
new file mode 100755
index 0000000..ee7b9c2
--- /dev/null
+++ b/Tutorial/Group 3/03.bas	
@@ -0,0 +1,15 @@
+' This program demonstrates how to use QuickBasic to draw a simple
+' graphic on the screen. It initializes the graphics mode, draws a
+' rectangle, and then draws a circle within that rectangle.
+
+' Set the graphics mode to 320x200 with 256 colors (mode 13)
+SCREEN 13
+
+' Draw a line
+LINE (10, 10)-(200, 100), 14
+
+' Draw a circle centered at (100, 100) with a radius of 80 pixels
+' using color 10 (bright green). The circle is drawn within the
+' previously defined rectangle.
+CIRCLE (100, 100), 80, 10
+
diff --git a/Tutorial/Group 3/04.bas b/Tutorial/Group 3/04.bas
new file mode 100755
index 0000000..8408375
--- /dev/null
+++ b/Tutorial/Group 3/04.bas	
@@ -0,0 +1,25 @@
+' This example program demonstrates how to draw different types of
+' lines and boxes on the screen using Microsoft QuickBasic.
+
+' First, we set the screen mode to 13 which provides a graphics
+' resolution of 320x200 with 256 colors available.
+SCREEN 13
+
+' Now we will draw three different objects using the LINE statement:
+
+' Draw an filled box from coordinates (10, 10) to (50, 50).
+LINE (10, 10)-(50, 50), 14, BF
+
+' Draw an unfilled box with coordinates (100, 10) to (150, 50).
+LINE (100, 10)-(150, 50), 14, B
+
+' Draw a line with coordinates (200, 10) to (250, 50).
+LINE (200, 10)-(250, 50), 14
+
+' To finish the program and allow users to see the drawn objects
+' before the screen closes, we wait for a key press from the user.
+PRINT "Press any key to exit..."
+WHILE NOT INKEY$ <> ""
+    ' Loop until a key is pressed
+WEND
+
diff --git a/Tutorial/Group 3/05.bas b/Tutorial/Group 3/05.bas
new file mode 100755
index 0000000..296eb8d
--- /dev/null
+++ b/Tutorial/Group 3/05.bas	
@@ -0,0 +1,15 @@
+' QuickBasic example program to demonstrate drawing lines with varying colors
+
+SCREEN 13 ' Set the screen mode to 13h which provides 256 color graphics
+
+' Draw vertical lines across the screen with colors from 0 to 255
+FOR xPosition = 0 TO 255
+    ' Draw a line from coordinates (xPosition, 50) to (xPosition, 100) using color xPosition
+    LINE (xPosition, 50)-(xPosition, 100), xPosition
+NEXT xPosition
+
+' Keep the window open until the user presses a key
+PRINT "Press any key to exit..."
+WHILE INKEY$ = ""
+WEND
+
diff --git a/Tutorial/Group 3/06.bas b/Tutorial/Group 3/06.bas
new file mode 100755
index 0000000..e60ab45
--- /dev/null
+++ b/Tutorial/Group 3/06.bas	
@@ -0,0 +1,27 @@
+' This program demonstrates basic graphics drawing in QuickBasic.
+' It uses the SCREEN function to set the graphics mode, draws a circle
+' and a line using CIRCLE and LINE commands respectively, waits for user
+' input, and then uses the PAINT command to fill an area with a solid color.
+
+' Set the screen to mode 13 which is 320x200 pixels with 256 colors.
+SCREEN 13
+
+' Draw a circle centered at (160, 100) with a radius of 80 pixels
+' and use color 15 for the outline of the circle.
+CIRCLE (160, 100), 80, 15
+
+' Draw a line from (100, 10) to (200, 180) using color 15.
+LINE (100, 10)-(200, 180), 15
+
+' Print a message to the screen prompting the user to press any key.
+PRINT "Press any key to fill part of the circle..."
+
+' Wait for the user to press a key and store the input in variable 'a$'.
+a$ = INPUT$(1)
+
+' Fill the area inside the circle with color 15 starting from point (180, 100).
+' Note that PAINT fills an area bounded by the specified color at the start point.
+PAINT (180, 100), 15
+
+END ' End the program (although END is not strictly necessary in QuickBasic)
+
diff --git a/Tutorial/Group 3/07.bas b/Tutorial/Group 3/07.bas
new file mode 100755
index 0000000..216341e
--- /dev/null
+++ b/Tutorial/Group 3/07.bas	
@@ -0,0 +1,25 @@
+' This program demonstrates how to use subroutines and drawing
+' commands in QuickBasic. It draws a simple figure consisting of
+' concentric circles and intersecting lines.
+
+DECLARE SUB DrawFigure (xCenter AS DOUBLE, yCenter AS DOUBLE)
+SCREEN 13 ' Set the screen mode for high-resolution graphics
+
+' To see a list of subroutines, press F2
+' This is useful when navigating through larger programs
+
+' Draw figures at different locations on the screen
+DrawFigure 100, 100
+DrawFigure 200, 50
+DrawFigure 180, 150
+
+SUB DrawFigure (xCenter AS DOUBLE, yCenter AS DOUBLE)
+    ' Draw three concentric circles with a specified center point
+    CIRCLE (xCenter, yCenter), 10, 15
+    CIRCLE (xCenter, yCenter), 20, 15
+    CIRCLE (xCenter, yCenter), 30, 15
+
+    ' Draw two lines intersecting at the center point
+    LINE (xCenter, yCenter - 50)-(xCenter, yCenter + 50), 15
+    LINE (xCenter - 50, yCenter)-(xCenter + 50, yCenter), 15
+END SUB
diff --git a/Tutorial/Group 3/08.bas b/Tutorial/Group 3/08.bas
new file mode 100755
index 0000000..56ba16e
--- /dev/null
+++ b/Tutorial/Group 3/08.bas	
@@ -0,0 +1,33 @@
+' This program demonstrates how to draw sine and cosine waves on the screen
+' using Microsoft QuickBasic. It is intended for beginners learning
+' programming in QuickBasic.
+
+' First, we set the graphics mode to 13 which provides a 320x200 pixel
+' resolution with 256 colors.
+SCREEN 13
+
+' We will draw two waves: one for sine and another for cosine. The amplitude
+' of both waves is scaled by a factor of 50, and they are vertically
+' centered on the screen by adding 100 to the y-coordinate.
+
+' The FOR loop iterates over the x-axis from 0 to 319 pixels, which covers
+' the entire width of the screen in this graphics mode.
+FOR x = 0 TO 319
+    ' Calculate the y-coordinate for the sine wave. We divide x by 10 to
+    ' reduce the frequency of the wave so it fits nicely on the screen.
+    ' The SIN function returns a value between -1 and 1, which we scale
+    ' and shift to get the desired waveform.
+    ysine = SIN(x / 10) * 50 + 100
+
+    ' Use PSET (Pixel SET) to plot a point on the screen for the sine wave
+    PSET (x, ysine), 14
+
+    ' Similarly, calculate and plot the cosine wave with color 12
+    ycosine = COS(x / 10) * 50 + 100
+    PSET (x, ycosine), 12
+
+    ' The loop continues to the next x-coordinate until it reaches 319.
+NEXT x
+
+' After the loop completes, both sine and cosine waves will be drawn on
+' the screen, with each point of the wave plotted in its respective color.
diff --git a/Tutorial/Group 3/09.bas b/Tutorial/Group 3/09.bas
new file mode 100755
index 0000000..31d9cb1
--- /dev/null
+++ b/Tutorial/Group 3/09.bas	
@@ -0,0 +1,40 @@
+' This program demonstrates how to draw a simple circle using QuickBasic.
+' It utilizes trigonometric functions SIN and COS to calculate the position of points on a circle.
+
+SCREEN 13 ' Set the screen mode to 13, which is 320x200 with 256 colors
+
+' Define pi (π) as a constant for calculations
+CONST pi = 3.141592653589789#
+
+' Define the number of points to be drawn on the circular shape
+DIM mi AS INTEGER
+mi = 12
+
+' Calculate the angle increment for each iteration of the loop
+' This will determine how many points we draw on the circle
+DIM angleStep AS SINGLE
+angleStep = pi * 2 / mi
+
+' Loop through angles from 0 to 2π (360 degrees) with the calculated step
+FOR a = 0 TO pi * 2 STEP angleStep
+
+    ' Calculate the x-coordinate of the current point on the circle
+    ' We multiply by 50 to scale the radius and add 100 for centering
+    DIM x AS SINGLE
+    x = SIN(a) * 50 + 100
+
+    ' Calculate the y-coordinate of the current point on the circle
+    ' Similarly, we scale and center the point
+    DIM y AS SINGLE
+    y = COS(a) * 50 + 100
+
+    ' Set the pixel at coordinates (x, y) with color 10
+    PSET (x, y), 10
+
+NEXT a
+
+' Wait for a key press before ending the program
+PRINT "Press any key to exit..."
+WHILE INKEY$ = ""
+WEND
+
diff --git a/Tutorial/Group 3/10.bas b/Tutorial/Group 3/10.bas
new file mode 100755
index 0000000..ad15b02
--- /dev/null
+++ b/Tutorial/Group 3/10.bas	
@@ -0,0 +1,53 @@
+' This program demonstrates basic QuickBasic graphics and sound capabilities.
+' It is designed for novice programmers to learn about drawing lines, plotting points,
+' handling user input, and generating simple sounds.
+
+' Set the graphics mode to 320x200 with 16 colors (mode 13).
+SCREEN 13
+
+' Draw a grid on the screen with horizontal and vertical lines every 10 pixels.
+' This loop demonstrates the use of the LINE function to draw lines.
+FOR i = 0 TO 320 STEP 10
+  ' Draw a horizontal line from the left edge to the right edge at y-coordinate i.
+  LINE (0, i)-(319, i), 5
+  ' Draw a vertical line from the top edge to the bottom edge at x-coordinate i.
+  LINE (i, 0)-(i, 199), 5
+NEXT i
+
+' Draw a horizontal line across the middle of the screen (y=100)
+LINE (0, 100)-(319, 100), 10
+
+' Prompt the user to press any key before continuing.
+PRINT "Press any key to continue..."
+' Wait for the user to press a key and store the input in variable a$.
+a$ = INPUT$(1)
+
+' Initialize variables for the bouncing ball animation and sound.
+DIM y AS SINGLE ' The vertical position of the ball, using single precision for smooth motion.
+DIM ys AS SINGLE ' The vertical speed of the ball.
+DIM t AS INTEGER ' A counter for the main animation loop.
+
+' Set the initial vertical position of the ball to the middle of the screen (y=100).
+y = 100
+' Set the initial vertical speed of the ball to a negative value for upward motion.
+ys = -1
+
+' The main animation loop runs from t=0 to t=300, simulating the passage of time.
+FOR t = 0 TO 300
+  ' Plot the current position of the ball with a specific color (14).
+  PSET (t, y), 14
+
+  ' Update the vertical speed of the ball by adding gravity-like acceleration (ys = ys + .01).
+  ys = ys + .01
+  ' Update the vertical position of the ball based on the current speed (y = y + ys).
+  y = y + ys
+
+  ' Generate a sound with a frequency that varies inversely with the ball's vertical position.
+  ' As the ball falls, the pitch of the sound increases.
+  SOUND 300 - y, .1
+NEXT t
+
+' The program ends here; to exit, press any key.
+PRINT "Press any key to exit..."
+a$ = INPUT$(1)
+
diff --git a/Tutorial/Group 3/11.bas b/Tutorial/Group 3/11.bas
new file mode 100755
index 0000000..6d1cfe9
--- /dev/null
+++ b/Tutorial/Group 3/11.bas	
@@ -0,0 +1,26 @@
+' This program demonstrates basic mathematical operations in QuickBasic.
+' It includes examples of rounding, taking the absolute value,
+' and finding the remainder of a division operation.
+
+DIM a AS SINGLE      ' Declare variable 'a' as type SINGLE for floating-point arithmetic
+
+' Assign a negative floating-point number to variable 'a'
+a = -12.7
+
+' Print the original value of 'a'
+PRINT "Normal: "; a
+
+' Use the INT function to round down 'a' to the nearest whole number
+' and print the result
+PRINT "Rounded down (INT): "; INT(a)
+
+' Use the ABS function to get the absolute value of 'a',
+' which is always non-negative, and print the result
+PRINT "Absolute value: "; ABS(a)
+
+' Calculate the remainder of 10 divided by 4 using the MOD operator
+' and store the result in an implicitly declared variable
+' Then print the result
+DIM reminder AS INTEGER
+reminder = 10 MOD 4
+PRINT "Remainder of 10 / 4 is: "; reminder
diff --git a/Tutorial/index.html b/Tutorial/index.html
new file mode 100644
index 0000000..459b8ee
--- /dev/null
+++ b/Tutorial/index.html
@@ -0,0 +1,16 @@
+<HTML>
+<HEAD><TITLE>QBasic tutorial</TITLE></HEAD>
+
+<BODY>
+
+<CENTER><H1>QBasic tutorial</H1></CENTER>
+<BR>
+<BR>
+<BR>QBasic tutorial.
+Is a good for those who like to learn by example.
+Package contains a lot of tiny self explainatory
+examples quiding you from simplest operations like printing
+to console, functions and array access to 2D and 3D graphics.
+<br>Used those successfully as examples when teaching programming for beginners.
+</BODY>
+</HTML>
\ No newline at end of file
diff --git a/Tutorial/qsort3.bas b/Tutorial/qsort3.bas
new file mode 100644
index 0000000..edc6407
--- /dev/null
+++ b/Tutorial/qsort3.bas
@@ -0,0 +1,136 @@
+DECLARE SUB sort (x1!, x2!)
+DECLARE SUB check ()
+DECLARE SUB di (r1!, r2!, c!)
+DECLARE SUB disp ()
+DIM SHARED siz
+siz = 15000
+DIM SHARED arr(1 TO siz)
+DIM SHARED mark(1 TO siz)
+DIM SHARED bck(1 TO siz)
+DIM SHARED dbg
+WIDTH 80, 50
+
+dbg = 1
+CLS
+FOR i = 1 TO 1000
+LOCATE 5, 40
+PRINT i
+RANDOMIZE i
+siz = 45
+
+FOR a = 1 TO siz
+  arr(a) = INT(RND * 100)
+  bck(a) = arr(a)
+NEXT a
+11
+
+sort 1, siz
+disp
+
+
+fail = 0
+FOR i2 = 1 TO siz - 1
+  IF arr(i2) > arr(i2 + 1) THEN
+    PRINT "wrong!"
+    a$ = INPUT$(1)
+    fail = 1
+    GOTO 10
+  END IF
+NEXT i2
+10
+
+IF fail = 1 THEN
+  FOR i2 = 1 TO siz
+    arr(i2) = bck(i2)
+  NEXT i2
+  dbg = 1
+  GOTO 11
+END IF
+
+NEXT i
+
+SUB di (r1, r2, c)
+
+mark(r1) = c
+mark(r2) = c
+disp
+mark(r1) = 0
+mark(r2) = 0
+
+
+END SUB
+
+SUB disp
+FOR i = 1 TO siz
+  LOCATE i, 1
+  COLOR 15, mark(i)
+  PRINT arr(i), "    ", i
+NEXT i
+
+IF dbg = 1 THEN a$ = INPUT$(1)
+'SOUND 0, .05
+END SUB
+
+SUB sort (x1, x2)
+min = 99999
+max = -99999
+FOR i = x1 TO x2
+  IF arr(i) > max THEN max = arr(i)
+  IF arr(i) < min THEN min = arr(i)
+NEXT i
+sv = (max + min) / 2
+LOCATE 1, 50
+PRINT sv
+'disp
+di x1, x2, 4
+IF x1 >= x2 THEN GOTO 3
+
+IF x1 + 1 = x2 THEN
+  IF arr(x1) > arr(x2) THEN SWAP arr(x1), arr(x2)
+  GOTO 3
+END IF
+
+xl1 = x1
+xl2 = x2
+
+
+1
+di xl1, xl2, 1
+IF arr(xl1) > sv THEN
+2
+  IF arr(xl2) < sv THEN
+    SWAP arr(xl1), arr(xl2)
+    xl1 = xl1 + 1
+    xl2 = xl2 - 1
+  ELSE
+    xl2 = xl2 - 1
+    di xl1, xl2, 1
+    IF xl1 = xl2 THEN GOTO 4
+    GOTO 2
+  END IF
+ELSE
+  xl1 = xl1 + 1
+END IF
+
+IF xl1 < xl2 THEN GOTO 1
+'IF arr(xl1) < sv THEN xl1 = xl1 + 1
+'IF arr(xl1) < sv THEN xl1 = xl1 + 1
+4
+mark(xl1) = 14
+disp
+mark(xl1) = 0
+
+IF xl1 = x2 THEN
+  sort x1, xl1 - 1
+ELSE
+  IF arr(xl1) > sv THEN
+    sort x1, xl1 - 1
+    sort xl1, x2
+  ELSE
+    sort x1, xl1
+    sort xl1 + 1, x2
+  END IF
+END IF
+3
+END SUB
+
diff --git a/VC.EXT b/VC.EXT
new file mode 100644
index 0000000..31271e4
--- /dev/null
+++ b/VC.EXT
@@ -0,0 +1 @@
+bas: c:\qb45\qb.exe !.!
\ No newline at end of file
diff --git a/index.org b/index.org
new file mode 100644
index 0000000..239fef8
--- /dev/null
+++ b/index.org
@@ -0,0 +1,451 @@
+#+SETUPFILE: ~/.emacs.d/org-styles/html/darksun.theme
+#+TITLE:  BASIC applications collection
+#+LANGUAGE: en
+#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry}
+#+LATEX_HEADER: \usepackage{parskip}
+#+LATEX_HEADER: \usepackage[none]{hyphenat}
+
+#+OPTIONS: H:20 num:20
+#+OPTIONS: author:nil
+
+#+begin_export html
+<style>
+  .flex-center {
+    display: flex;            /* activate flexbox */
+    justify-content: center;  /* horizontally center anything inside   */
+  }
+
+  .flex-center video {
+    width: min(90%, 1000px); /* whichever is smaller wins */
+    height: auto;            /* preserve aspect ratio */
+  }
+
+  .responsive-img {
+    width: min(100%, 1000px);
+    height: auto;
+  }
+</style>
+#+end_export
+
+
+* Overview
+This collection contains lots of applications:
+
+- [[id:3587240c-1d50-478d-b850-04ebc8dc63c7][Miscellaneous]]
+
+- [[id:ebafd8a3-54d4-4834-a03d-a942b535a82f][2D Graphics]]
+  - [[file:2D%20GFX/Animations/index.html][Animations]]
+
+- [[id:63fd5d58-9bce-4c0a-99d4-ed2d025258f0][3D Graphics]]
+- [[id:aa195f33-6d69-48ff-9af5-3f761a51dcb2][Games]]
+
+I wrote them at around year 2000, mostly in QBasic.
+
+* 2D GFX
+:PROPERTIES:
+:ID:       ebafd8a3-54d4-4834-a03d-a942b535a82f
+:END:
+** Animations
+
+Collection of various 2D animations. Good for demonstrating various
+algorithms and getting fun looking results quite easily.
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:2D%20GFX/Animations/index.html][file:2D%20GFX/Animations/logo.png]]
+
+[[file:2D%20GFX/Animations/index.html][See entire animations collection]]
+
+** Fractals
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:2D%20GFX/Fractals/index.html][file:2D%20GFX/Fractals/fractal%20squares,%202.png]]
+
+[[file:2D GFX/Fractals/index.html][See entire fractals collection]]
+
+** Spiral series
+
+Small collection of programs that are result of exploratory
+programming, for fun. It started out from drawing spiral on the
+screen. Every iteration built upon previous result.
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:2D%20GFX/Spirals/index.html][file:2D%20GFX/Spirals/logo.png]]
+
+[[file:2D%20GFX/Spirals/index.html][See entire spiral collection]]
+
+** Textures
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:2D%20GFX/Textures/index.html][file:2D%20GFX/Textures/logo.png]]
+
+[[file:2D%20GFX/Textures/index.html][See entire texture collection]]
+
+** Miscellaneous
+*** Hello friend
+
+TODO: description goes here ...
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:2D%20GFX/Hello%20friend.bas][file:2D%20GFX/Hello%20friend.png]]
+
+[[file:2D%20GFX/Hello%20friend.bas][Hello friend.bas]]
+
+#+INCLUDE: "2D GFX/Hello friend.bas" src basic-qb45
+
+*** People
+
+TODO: description goes here ...
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="2D GFX/People.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:2D%20GFX/People.bas][People.bas]]
+
+*** Stroboscope
+
+TODO: description goes here ...
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:2D%20GFX/Stroboscope.bas][file:2D%20GFX/Stroboscope.png]]
+
+[[file:2D%20GFX/Stroboscope.bas][Stroboscope.bas]]
+
+*** Truncated cone
+
+TODO: description goes here ...
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:2D%20GFX/Truncated%20cone.bas][file:2D%20GFX/Truncated%20cone.png]]
+
+[[file:2D%20GFX/Truncated%20cone.bas][Truncated cone.bas]]
+
+#+INCLUDE: "2D GFX/Truncated cone.bas" src basic-qb45
+
+* 3D GFX
+:PROPERTIES:
+:ID:       63fd5d58-9bce-4c0a-99d4-ed2d025258f0
+:END:
+** Miscellaneous 3D demos
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Miscellaneous/index.html][file:3D%20GFX/Miscellaneous/logo.png]]
+
+[[file:3D GFX/Space/index.html][See entire miscellaneous 3D demo applications collection]]
+
+** Space
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Space/index.html][file:3D%20GFX/Space/logo.png]]
+
+[[file:3D GFX/Space/index.html][See entire space themed applications collection]]
+
+** 3D Synthezier
+
+Parses scene definition language and creates 3D world based on
+it. Result will be in a [[https://en.wikipedia.org/wiki/Wavefront_.obj_file][wavefront obj file]], witch can be then
+visualized using external renderer.
+
+See directory:
+: 3D GFX/3D Synthetizer/
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/3D%20Synthezier/doc/index.html][file:3D%20GFX/3D%20Synthezier/doc/hexagonal%20city,%202.jpeg]]
+
+[[file:3D%20GFX/3D%20Synthezier/doc/index.html][Read more]]
+
+** Helicopter demo
+
+TODO: description goes here ...
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Helicopter/demo,%201.png][file:3D%20GFX/Helicopter/demo,%201.png]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Helicopter/demo,%202.png][file:3D%20GFX/Helicopter/demo,%202.png]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Helicopter/demo,%203.png][file:3D%20GFX/Helicopter/demo,%203.png]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Helicopter/demo,%204.png][file:3D%20GFX/Helicopter/demo,%204.png]]
+
+[[https://www2.svjatoslav.eu/gitweb/?p=qbasicapps.git;a=tree;f=3D+GFX/Helicopter;hb=HEAD][Project files]]
+
+** Swapping 3D engine
+
+TODO: description goes here ...
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Swapping%203D%20engine/screenshot.png]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Swapping%203D%20engine/screenshot,%202.png]]
+
+[[file:3D%20GFX/Swapping%203D%20engine/engine.bas][engine.bas]]
+
+** 3D land
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="3D%20GFX/3D%20land.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+
+[[file:3D%20GFX/3D%20land.bas][3D land.bas]]
+
+#+INCLUDE: "3D GFX/3D land.bas" src basic-qb45
+
+** Anaglyph
+
+TODO: description goes here ...
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Anaglyph.bas][file:3D%20GFX/Anaglyph.png]]
+
+[[file:3D%20GFX/Anaglyph.bas][Anaglyph.bas]]
+
+** Ray casting engine
+
+TODO: description goes here ...
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:3D%20GFX/Ray%20casting%20engine.bas][file:3D%20GFX/Ray%20casting%20engine.png]]
+
+[[file:3D%20GFX/Ray%20casting%20engine.bas][Ray casting engine.bas]]
+
+* Misc
+:PROPERTIES:
+:ID:       3587240c-1d50-478d-b850-04ebc8dc63c7
+:END:
+* Games
+:PROPERTIES:
+:ID:       aa195f33-6d69-48ff-9af5-3f761a51dcb2
+:END:
+** Multiplayer game of worms
+
+Game supports up to 5 players. Any amount of those players can be AI
+controlled. Game has multiple levels. After worms have eaten certain
+amount of fruits, game advances to the next level. Each worm has
+limited amount of lives. When worm runs into the wall or another worm,
+it loses one life.
+
+#+begin_export html
+<div class="flex-center">
+  <video controls loop autoplay>
+    <source src="Games/Worm/screencast.webm" type="video/webm">
+    Your browser does not support the video tag.
+  </video>
+</div>
+#+end_export
+
+[[file:Games/Worm/worm.bas][Source code]]
+
+Levels are stored in [[https://www2.svjatoslav.eu/gitweb/?p=qbasicapps.git;a=tree;f=Games/Worm;h=644d30adafb2621f34f6d2f3e43e026084092f60;hb=HEAD]['lvl' files]] that are directly editable using text
+editor.
+
+** Checkers
+
+Play checkers against the computer with any board size and any amount
+of caps. Does thinking by recursively testing many possible scenarios
+with any depth.
+
+Since it is slow QBasic implementation, it isn't practical to play
+with many caps or big thinking depth, for reasonable responce time.
+
+[[file:Games/Checkers 2/checkers2.bas][Source code]]
+
+#+attr_html: :class responsive-img
+#+attr_latex: :width 1000px
+[[file:Games/Checkers 2/checkers2.bas][file:Games/Checkers%202/screenshot.png]]
+
+* Download
+** Getting the source code
+
+Programs author is Svjatoslav Agejenko
+- Homepage: https://svjatoslav.eu (See also [[https://www.svjatoslav.eu/projects/][other software projects]].)
+- Email: mailto://svjatoslav@svjatoslav.eu
+
+*These programs are free software: released under Creative Commons
+Zero (CC0) license.*
+
+- [[https://www2.svjatoslav.eu/gitweb/?p=qbasicapps.git;a=summary][Browse Git repository online]].
+- [[https://www2.svjatoslav.eu/gitweb/?p=qbasicapps.git;a=snapshot;h=HEAD;sf=tgz][Download latest snapshot in TAR GZ format]].
+- You can clone Git repository using git:
+  : git clone https://www3.svjatoslav.eu/git/qbasicapps.git
+
+** Installation and Usage
+
+There are various ways to run legacy QBasic applications under Debian
+GNU/Linux:
+
++ Full system virtualization :: One way would be to use full system
+virtualization with [[https://www.qemu.org/][QEMU]], [[https://www.virtualbox.org/][VirtualBox]] or [[https://www.vmware.com/products/desktop-hypervisor.html][VMware Workstation or
+Player]]. After creating virtual machine, you need to obtain and
+install some distribution of DOS like [[https://en.wikipedia.org/wiki/MS-DOS][MS-DOS]] or [[https://www.freedos.org/][FreeDOS]]. Within DOS
+you can then use either Microsoft *QBasic* or Microsoft
+*QuickBasic*. QBasic is already included in Microsoft DOS by
+default. QuickBasic is more capable but must be obtained separately.
+
+- QB64 :: [[https://qb64.com][QB64]] is mostly compatible with Microsoft BASIC variants and
+ can be used too.
+
+- [[id:97ea6094-ade6-4c7d-aea9-9874acf9dc86][DOSBox + MS BASIC]] :: Easy to install and good compatibility.
+
+*** DOSBox + MS BASIC
+:PROPERTIES:
+:ID:       97ea6094-ade6-4c7d-aea9-9874acf9dc86
+:END:
+
+Following tutorial focuses on using DOSBox with original Microsoft
+QBasic or QuickBasic.
+
+DOSBox is trivial to install and BASIC programs do not need to be
+copied to virtual drive or operating system to run them. Using
+original BASIC binaries ensures good compatibility.
+
+
+Here is suggested installation and usage procedure:
+
+1. Install DOSBox by running the following command in your terminal:
+   : sudo apt-get install dosbox
+
+2. Obtain and place a copy of QuickBasic *QB.EXE* executable binary
+   into directory */QB45/* within project root directory.
+
+   Optionally obtain [[https://en.wikipedia.org/wiki/Volkov_Commander][Volkov Commander]] executable VC.COM and place it
+   under project root directory. Volkov Commander simplifies
+   filesystem navigation and running arbitrary BASIC program by
+   selecting it and pressing ENTER key. For this to work, BAS file
+   extension is mapped to BASIC executable within VC.EXT file (already
+   available in the project root directory). In case you are using
+   QBasic instead, feel free to fix VC.EXT to point to appropriate
+   BASIC executable.
+
+3. Optionally check and apply [[id:13c7d873-f1aa-4061-88ac-dc9e43c6303d][DOSBox usage tips]].
+
+4. Execute script that is located in the root directory of the
+   repository:
+   : ./run_dosbox.sh
+
+5. Now project root directory appears as root directory of virtual
+   *C:* drive. You can navigate around and start programs.
+
+
+Here is suggested project directory layout with QuickBasic and Volkov
+Commander installed:
+#+begin_example
+  ├── COPYING
+  ├── index.org
+  ├── QB45
+  │   ├── QB.EXE
+  │   └── QB.INI
+  ├── run_dosbox.sh
+  ├── (... other repository files and directories)
+  ├── VC.COM
+  ├── VC.EXT
+  └── VC.INI
+#+end_example
+
+*** DOSBox usage tips
+:PROPERTIES:
+:ID:       13c7d873-f1aa-4061-88ac-dc9e43c6303d
+:END:
+**** How to change keyboard layout to Dvorak
+
+In case you want to use Dvorak keyboard layout and DOSBox fails to
+auto-apply it, here is how you can set it manually:
+
+1. Edit file:
+  : ~/.dosbox/dosbox-<version>.conf
+
+2. Disable scancodes usage:
+   : usescancodes=false
+
+3. Save the changes and restart DOSBox for the configuration to take
+   effect.
+
+**** Increase window size
+
+If you have big high-resolution screen, by default DOSBox window could
+appear small. To make it bigger:
+
+1. Edit file:
+  : ~/.dosbox/dosbox-<version>.conf
+
+2. Set windowresolution to either of those values:
+   : windowresolution=1366x768
+   : windowresolution=1600x900
+
+3. Save the changes and restart DOSBox for the configuration to take
+   effect.
+
+4. If scaling did not work, set output to opengl:
+   : output=opengl
+
+**** Exit mouse capture
+
+DOSBox detects when a game uses mouse control. When you click on the
+screen, it should get locked (confined to the DOSBox window) and work.
+
+To release mouse lock, press:
+: CTRL-F10
+**** Increase CPU speed for better animation smoothness
+
+Many applications benefit from as fast CPU as possible. Games and
+animations that require limited frames per second always have their
+own CPU independent mechanisms for limiting animation speed. So
+setting CPU as fast as possible within emulator is beneficial.
+
+This is how I accomplished it in DOSBox:
+
+
+1. Edit file:
+  : ~/.dosbox/dosbox-<version>.conf
+
+2. Edit [cpu] section accordingly:
+  #+begin_src conf
+    [cpu]
+    core=normal
+    cputype=auto
+    cycles=fixed 100000
+  #+end_src
+
+3. Save the changes and restart DOSBox for the configuration to take
+   effect.
+** See also
+
+- Programs found in the March 1975 3rd printing of David Ahl's 101
+  BASIC Computer Games, published by Digital Equipment Corp:
+  https://github.com/maurymarkowitz/101-BASIC-Computer-Games
+
+- QB64 is a modern extended BASIC programming language that retains
+  QBasic/QuickBASIC 4.5 compatibility and compiles native binaries for
+  Windows, Linux, and macOS: https://qb64.com/
diff --git a/run_dosbox.sh b/run_dosbox.sh
new file mode 100755
index 0000000..12c0b34
--- /dev/null
+++ b/run_dosbox.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# Run DOSBox with the current directory mounted as C: drive and switch to C: drive on startup.
+dosbox -c "MOUNT C: $(pwd)" -c "C:"