Search found 247 matches

by GCHarder
Tue Jan 14, 2020 11:02 pm
Forum: ZX BASIC
Topic: Resizing the screen (number of lines)
Replies: 7
Views: 281

Re: Resizing the screen (number of lines)

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
by GCHarder
Sun Jan 05, 2020 9:55 pm
Forum: Software
Topic: OpArt for the ZX81 with Chroma
Replies: 2
Views: 469

Re: OpArt for the ZX81 with Chroma

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
by GCHarder
Thu Jan 02, 2020 8:19 pm
Forum: Software
Topic: OpArt for the ZX81 with Chroma
Replies: 2
Views: 469

OpArt for the ZX81 with Chroma

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

Regards;

Greg
OpArt.zip
Program and docs
(997.74 KiB) Downloaded 18 times
by GCHarder
Sat Dec 28, 2019 8:08 pm
Forum: Software
Topic: New Year Fireworks, Colorized
Replies: 0
Views: 225

New Year Fireworks, Colorized

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
Fireworks.gif
Fireworks.gif (1.78 KiB) Viewed 225 times
by GCHarder
Fri Dec 20, 2019 12:17 am
Forum: Development
Topic: New ZX80 cases
Replies: 18
Views: 999

Re: New ZX80 cases

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
by GCHarder
Sun Dec 08, 2019 12:00 am
Forum: GAMES
Topic: Pac man on the ZX81
Replies: 12
Views: 1531

Re: Pac man on the ZX81

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.
by GCHarder
Fri Dec 06, 2019 11:24 pm
Forum: GAMES
Topic: Pac man on the ZX81
Replies: 12
Views: 1531

Re: Pac man on the ZX81

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...
by GCHarder
Sat Nov 30, 2019 7:55 pm
Forum: ZX BASIC
Topic: HLIN & VLIN BASIC extensions
Replies: 2
Views: 703

HLIN & VLIN BASIC extensions

Versions of Applesoft's HLIN and VLIN commands for the ZX81.

See enclosed .txt file for more info.

Regards;

Greg
HLinVLin.zip
Source and demo
(6.34 KiB) Downloaded 29 times
by GCHarder
Mon Nov 25, 2019 11:12 pm
Forum: Emulators
Topic: [Vb81] Test release.
Replies: 23
Views: 6613

Re: [Vb81] Disassembler Window

If not too hard would it be possible to make the disassembler window resizable? I find it a bit constricting, especially when the contents of the registers are being shown. I'd also like to see wider columns, these are sizable, but restricted because of the size of the main window. Just a suggestion...
by GCHarder
Mon Nov 04, 2019 11:20 pm
Forum: Sinclair Misc
Topic: ZX81 Academic and Research related articles!
Replies: 1
Views: 688

ZX81 Academic and Research related articles!

https://www.tandfonline.com/action/doSearch?AllField=zx81 Most of these are "Locked", so you can only read the abstracts, which gives you the idea. You can pay to get access if you want. A few are "Open Access", like the Quicksilva article I posted yesterday. Here's another one https://www.tandfonli...