Sinclair ZX80 / ZX81 / Z88 Forums

LANGTON'S ANT. Hardware: ZX81+ZXPand+UDG4ZXPand in CHR$128 mode * ZX81+ZXPand+Chroma in CHR$128 mode ZX81+ZXPand+UDG Board in CHR$128 mode Emulator: sz81 in ZXPand+CHR$128 mode EightyOne in ZXPand+CHR$128 mode ------------------------------------------------------------------------------- From Wikip...

AntiAir...

http://inufuto.web.fc2.com/8bit/antiair/#zx81

This is a fast "Shoot'em Up" by S.P. Kelly originally published by Micro-Gen, 198?. Despite the name this is NOT a ZX81 version of the arcade classic. There's already a Chroma color version of this, posted elsewhere, so I thought I'd also do a CHR$128 conversion as well. This is actually a pretty in...

Here's another fun little game. Originally published by Timex as part of the "Mixed Game Bag III" collection, 1982. Programmed by Micheal Orwin. My mods... I've increased the play area to the full 24 line display. Changed control keys to Q-A-O-P instead of 5-6-7-8. Sped up the game with a couple MC ...

This is a frantic little game! The original is only around 900 bytes, 512 bytes for the MC and the rest is for the BASIC loader. The program is interesting in that multiple key presses are permitted, so you can move and fire at the same time, you'll need to do this. There doesn't seem to be an ammo ...

Implementing multistatement lines is actually fairly simple, in MC. It's just a matter of keeping track of the chr addresses in the line. The program "SHREB" from 1986 uses multistatement lines. Since you have a ZXPand you maybe interested in these programs... https://www.sinclairzxworld.com/viewtop...

I recall, along time ago, that I had a similar problem and replacing the voltage regulator fixed the problem. I got this idea from a forum posting but I can't find it. Not being a hardware guy I have no idea why the voltage regulator would garble the display, but replacing it worked for me. Regards ...

If your not aware, some of the best games for the ZX81 are by Bob Smith.

https://bobs-stuff.itch.io/

Regards;

Greg

These are not really new routines just modified for use as "inline" routines.

PRINT USR HFLP

PRINT USR VFLP

Greg

"Falling Balls" is another interesting strategy game. First published in "Hebdogiciel", the type-in was done by XavSnap. My version is essentially the same but with french text replaced with Google english. I did add a SEED mod so that you can replay the same game again to get a higher score. There ...