In some other screen modes, "planes" complicate things, but "screen 13" is simple. offset = y * 320 + x or: x = offset MOD 320 y = offset \ 320 The POKE line in the .bas file in the other post could be replaced with: PSET ((p& + c) MOD 320, (p& + c) \ 320), sins(r + f) + sins(c + f) + sins(r + c) + rands(f2 * r + c) Regards, Michael
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