Sinclair ZX80 / ZX81 / Z88 Forums

2001 - A ZX81 Odyssey This "demo" kind of reminds me of the "Trip to Infinity" ending in 2001, well I said kind of. It's a never ending journey through the ZX81's various graphic capabilities. There are three versions, depending on your hardware. 2001-Z Standard version, ZX81+16K RAM pack, tested on...

What's the deal with EXX, I'd love to use this instruction but every time I do it crashes my program. Must be something to do with the display system, similar, I suppose, to using the IX register. Toni Baker kind of implies that it can be used "quite safe(ly)". From MMC on the ZX81... "EXX As well a...

Blackjack video

https://m.youtube.com/watch?v=-rBaJHEdNKk

Download site listed in comment.

The Matrix Rain video

https://m.youtube.com/watch?v=ytAl5UW1woY

Very impressive demo.

Enjoy;

Greg

Thanks, that's a neat trick, I'll have to remember it.

Regards;

Greg

ZigZags by Noice, nice programs originally designed for 1K ZX81. The original programs are Noice-1.p (AKA Severely Limited v1) Noice-2.p (AKA Severely Limited v2) ZigZags is my full screen version. Can anyone explain to me how these programs, Noice-1 and 2, even LOAD and RUN. There is absolutely no ...

Wouldn't it be easier just to use your screen compress routines?

viewtopic.php?f=5&t=1587&p=19562&hilit= ... ess#p19562

But, I guess it's not strictly speaking BASIC then.

Regards;

Greg

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