Z80 Size Programming Challenge #2

Last week I issued the second Z80 programming challenge:

Something slightly more complex this time. Write the shortest code to mirror the entire Sinclair Spectrum screen (256×192 pixels) left to right including the colours / attributes. The deadline is Monday 15th, midday (GMT).

Target: under 50 bytes.

1. Your program shouldn’t rely on the initial contents of registers.
2. No RAM/ROM other than the screen memory should be written to.
3. Programs must return. The RET instruction is included in the size.
4. So everyone has a fair chance comment with the code size not code.
5. There are no prizes, just the chance to show off your coding skills.

 

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thanks to JM @ http://www.retroprogramming.com/