Sinclair ZX80 / ZX81 / Z88 Forums

I am mostly looking at books specifically on Z80 on the zeddy so I can get my head around the memory map and zeddy specific gotchas such as not touching the IX / IY registers etc. I have a fixed startbase for all programs. Standard values for sysvar, 1 BASIC-line calling the machinecode and then ju...

I want to use the routine from Fruit Machine simulator for this game with numbers. http://www.youtube.com/watch?v=9mq8ILulfBU&t=2m20s The computer should also calculate a solution however this would need 710x1024 permutations and would need at least 32 minutes per game. So I am working on a reduced ...

Display glitches now gone Johan. :D The chosen solution was simple. Since on the picture the third line was OK, I added 2 empty lines above. And below was due to calling empty lines in lowres out of sync. Solution there: fill the screen in highres with a lot of delay. I needed a few bytes for the s...

How do I load a game in EightyOne in ZX80 mode?
I only get a full black screen with a game I found.

Edit: got something....

Therefore a different start is needed, checking ROM now....

It makes me search the ROM and thinking of hires on 1K ZX80.....

If you want to see the rollover.....

This version rolls slowly.

Ok,

some cosmetic bugs and a problem with loading some hardware.

This can be the bugfixes. At least I expect it to be the visual bugs.

Thanks,

The game was untested on real hardware.
I will make a fix, not too hard, but need to find a few bytes. I have a few already.

Now in gamesection with 48K bugrepair.

http://sinclairzxworld.com/viewtopic.ph ... 995#p23995