OpArt for the ZX81 with Chroma

Discussion about ZX80 / ZX81 Software
Post Reply
User avatar
GCHarder
Posts: 250
Joined: Sat Dec 14, 2013 7:46 pm

OpArt for the ZX81 with Chroma

Post by GCHarder » Thu Jan 02, 2020 8:19 pm

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

Regards;

Greg
Screen shots
Screen shots
Attachments
OpArt.zip
Program and docs
(997.74 KiB) Downloaded 33 times

Fruitcake
Posts: 150
Joined: Wed Sep 01, 2010 10:53 pm

Re: OpArt for the ZX81 with Chroma

Post by Fruitcake » Sat Jan 04, 2020 1:29 am

Nice! I've added a link to the program from my website.

One issue that caught me out for a while is that the program only runs when using the edition 2 ZX81 ROM. With an edition 1 ROM the program crashes with error code C/9510.

User avatar
GCHarder
Posts: 250
Joined: Sat Dec 14, 2013 7:46 pm

Re: OpArt for the ZX81 with Chroma

Post by GCHarder » Sun Jan 05, 2020 9:55 pm

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

Post Reply