Sinclair ZX80 / ZX81 Forums

https://www.youtube.com/watch?v=4IS2MbAGATo Short demo of OTLA 2.2 app. which is available here... https://code.google.com/archive/p/otla/downloads, Official version? http://retro.lisias.net/computing/misc/otla/, Unofficial version? I've never seen this app before, but it looks pretty useful. Regard...

"The Universe of Cellular Automata" by Hardin Brothers, PCResource 09/1989. This was another article I've had hidden in my archive for years, which I re- cently rediscovered. Some more interesting programs written in 8086 assembly, C and Quick Basic. I've included the scans for those interested, the...

ZX81 specific wallpapers

Maybe you're thinking of...

POKE 16418,X where X is the number of lines in the bottom part of the screen. This is normally 2, 0 gives 24 lines to the top part of the screen, 10 would devote 10 lines to the bottom and 14 to the top.

Not sure if this works on a 1K ZX81 though.

Regards;

Greg

It has to do with differences in the "expression evaluator" between the two ROMs, at 0F55 in edition 2. Any app using the evaluator, such as Hot Z, will crash. Try this on both ROMs PRINT +1.

Unfortunately, there's no easy work around for this.

Regards;

Greg

Designed for Chroma but works without. Tested in emulation only.

Regards;

Greg

I don't know who wrote this, I just colorized it for Chroma. I assume it was posted here somewhere before, but a search didn't find anything. Anyway, kudos to the original author, it's quite a nice display.

Regards;

Greg

https://m.facebook.com/groups/sinclairc ... view=group

This is "public" Facebook group. You don't have to be a member, I'm not. I've been able to read it without any problems. However, you do get a persistant NAG screen though.

Regards;

Greg

Maybe the most ambitious Pacman was posted by Brian Lewis, pseudo-hires and the behavior of the ghosts was supposed to mimic the the original.

viewtopic.php?f=4&t=1306&hilit=Bob+lewis

Regards;

Greg

PS this thread should probably be moved to the games section.

There are literally dozens of versions, commercial and mag type-ins. All the early 80's arcade hits had ZX81 versions, Defender, Scramble...etc. There are probably 20 or more versions of Space Invaders. Of course the quality varies greatly. Most of these are available in the ZX81 software collection...