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Discussion forums for users of the Sinclair ZX80 / ZX81 and their clones
The ZX81 makes use of incomplete memory address decoding, so uses a memory echo / shadow of the RAM in an unconventional way to produce the display.GCHarder wrote:This program is one of the few which RUNs in upper memory, 8000H. As such, on a real ZX81, you have to have the hardware mod called "M1 NOT" installed otherwise M.C. programs will not run, has something to do with the video display, but not sure about that.
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