Sinclair ZX80 / ZX81 / Z88 Forums

When I implemented UDG graphics in ZX Galaxians a while back it was also my intention to incorporate some support for the ZONX81, but I ended up getting distracted by other things and that was forgotten. But a few days ago I was revisiting the AY drivers used by Sirmorris in the "Bigg Oil" and "ZeD...

No, You leave the ULA chip alone. You are fine now! :-D There are 3 versions of ULA. The first two ULAs are buggy because they don't have their back porches feature yet. The final version [2C210E] had its back porch feature. 1024MAK has his better explanation on these ULAs' details somewhere on thi...

This ZX81 has a non-working EAR port which appears to be down to the ULA. I carefully desoldered the ULA (I've done a Z80 successfully on a Spectrum before now) and socketed it. Just now I stupidly managed to insert it upside down in its socket and powered it on. With the ULA back in the correct or...

It's worth checking out the new games thread as a lot of the new software there uses AY. There is also Sea-dragon reworked for the 81 which as well as sound effects has a title tune composed by yours truly (he says modestly) although this does require a UDG board of some description. https://www.si...

Hi. I've finally managed to get a Bi Pak Zon x-81. Does anyone on here have a list or link to any software which uses this in its code? Also be interesting to know how many units were actually made. Cheers in advance. That's the music/sound expansion, right? There is a bunch of stuff that supports ...

I what I would really like to see is the output from running /Users/myuser/Applications/SZ81/SZ81.app/Contents/MacOS/SZ81 in a terminal window and then exiting. It should look something like this: $ /Applications/Emulation/SZ81/SZ81.app/Contents/MacOS/SZ81 2021-09-26 06:45:16.714 SZ81[58050:2560110]...

Also, try going to System Preferences -> Security & Privacy -> Privacy -> Full Disk Access -> Unlock the panel and click + and add SZ81.

I have just moved it from /Applications to /Users/myuser/Applications, but it gives same reaction. Just a white screen. The code i running however, because F10 closes the program. Try running /Users/myuser/Applications/SZ81/SZ81.app/Contents/MacOS/SZ81 from a terminal window and post here what is o...

Have you tried running this under macOS Big Sur? Maybe there is some new security in that version of macOS. It seems like it might not have access to read it's own files with icons and font. So the screen is just white. Try this... From the finder GUI (important) move the SZ81 folder to any other l...

I like Eightyone but I own a Mac so I often run SZ81 instead because it runs natively where as I have to run Eightyone under Wine. Since I use a Mac myself, a Mac port is a higher priority than linux, but I don't think they've released gcc for M1 yet? I think M1 still runs 64 bit Intel code. GCC is...