Langton's Ant CHR$128 version

[GCHarder]

LANGTON'S ANT.

Hardware:
ZX81+ZXPand+UDG4ZXPand in CHR$128 mode *
ZX81+ZXPand+Chroma in CHR$128 mode
ZX81+ZXPand+UDG Board in CHR$128 mode

Emulator:
sz81 in ZXPand+CHR$128 mode
EightyOne in ZXPand+CHR$128 mode
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From Wikipedia...

"Langton's ant is a two-dimensional Turing machine with a very simple
set of rules but complicated emergent behavior. It was invented by
Chris Langton in 1986 and runs on a square lattice of black and white
cells.

The rules...

At a white square, turn 90° right, flip the color of the square, move
forward one unit

At a black square, turn 90° left, flip the color of the square, move
forward one unit"
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* No UDG board, no problem.

In the program "Demos\AntGUI.p" change this line...

From: 9240 PRINT USR BNKX;0 ;Use Bank0 font.
To: 9240 PRINT USR BNKX; ;Use ZX81 font.

Then save your changes by RUNning 9990.

The screens may look a bit funky due to UDG substitutions but the overall
program will work fine.

Use predefined UDG set B for best results.

Demo Videos...

https://www.youtube.com/watch?v=OIOIsrma65U&t=324s

https://www.youtube.com/watch?v=TOlPvBu_qVU

Enjoy;

Greg

[Moggy]

Nice, just the kind of thing I like to see the zeddy doing, I will have this running on a spare zeddy as a kind of screen saver, it's kind of hypnotic.