Appears On
A complete 128-color display test cycles every ink, paper, and bright combination using a clever checkerboard UDG that visually blends foreground and background hues.
Two bouncing points trace 200 lines across the screen in an ever-changing geometric art display, then clear and restart with a new pattern.
Enter any word and watch it instantly tile across the entire screen in random colors — a surprisingly effective background generator built from one clever string-doubling trick.
Discover how a BASIC banner printer reads ROM font data directly, rotates character bitmaps 90 degrees, and scales letters up to four times their normal size for hardcopy output.
A mesmerizing geometric "Clover" pattern grows petal by petal with randomized colors and three distinct drawing modes, then floods the screen with fill lines before restarting.
A perspective doorway scene built entirely from PLOT and DRAW geometry — then brought to life with a hypnotic random-colour flash animation.
Draw a 2D profile, press Enter, and watch it spin into a shaded 3D wire-frame solid — powered by rotation matrices and embedded machine code.
Six mathematical graphics routines — spirographs, parametric spirals, sine waves, and circle arrays — each driven by user input or looped parameters, all in one program.
A user-group demo combining machine code speech synthesis, animated text routines, and a parametric spirograph plotter driven by user-supplied "magic numbers."
A mesmerising line-burst pattern redraws itself endlessly in randomly chosen colour combinations — watch a geometric network bloom from a single screen point.
A compact loader patches two system variables to install a custom character set from a saved code block — here's how it redirects the UDG pointer at runtime.
A self-destructing font generator that rewrites the ROM character set byte-by-byte into RAM, then hands you a bolder typeface and vanishes.
A self-contained animated Christmas card plays holiday music, scrolls a UDG-drawn sleigh across the sky, and flashes a greeting — all in one compact BASIC program.
A clever pixel-scaling routine reads a signature from the screen's bottom edge and redraws it enlarged with a two-tone colour effect and audio feedback.
A machine-code-powered demo explores all three UDG character rendering modes, passing parameters via POKEs before each call to embedded code hiding in a REM statement.
