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Converting Spectrum code to zx80,81
Posted: Wed May 25, 2022 8:30 am
by Crayon21
Apologies if this is in the wrong area
What changes would I need to make to convert a spectrum game to the 81 or 80?
any ideas?
Re: Converting Spectrum code to zx80,81
Posted: Thu May 26, 2022 1:36 am
by Spinnetti
Never tried it, but feels like it would just be easier to write from scratch.
Re: Converting Spectrum code to zx80,81
Posted: Thu May 26, 2022 7:25 am
by Paul
Easiest way would be to supply a ZX81 with the sponzy ROM. This is a spectrum ROM modified to run on a ZX81.
Pure basic still is a problem because spectrum has multiple commands on each line which have to be single commands per line.
Graphics is far enhanced compared to the ZX81.
So it's really easier to rewrite from scratch.
Re: Converting Spectrum code to zx80,81
Posted: Thu May 26, 2022 10:16 am
by dr beep
Crayon21 wrote: ↑Wed May 25, 2022 8:30 am
Apologies if this is in the wrong area
What changes would I need to make to convert a spectrum game to the 81 or 80?
any ideas?
I converted my Shogun game into a ZX81 game.
I had to alter the source on several points
1) skip use of IX and A'
2) make new display on screen
3) alter key reading
and your game needs to fit 16K