Sinclair ZX80 / ZX81 / Z88 Forums

Spinnetti wrote: ↑Sat Mar 16, 2024 3:10 am back in 82, I simply cut a hole in the case, put in a joystick port, and hardwired it to the arrow keys... pretty simple....

Ahh, but number 5 key adds complexity. How did you handle "5" being on a separate half row (and hence using a different "common" line to the rest of the keys)?

Mark

1024MAK wrote: ↑Sat Mar 16, 2024 10:58 am Ahh, but number 5 key adds complexity. How did you handle "5" being on a separate half row (and hence using a different "common" line to the rest of the keys)?

The Brazilian clones TK82/TK83/TK85 had a joystick input using this scheme. Line A12 is common for keys 6, 7, 8, 0 and line A11 is common for key 5.

The Atari joystick needs to be modified to work in this scheme.

kmurta wrote: ↑Sat Mar 16, 2024 1:47 pm The Brazilian clones TK82/TK83/TK85 had a joystick input using this scheme. Line A12 is common for keys 6, 7, 8, 0 and line A11 is common for key 5.

The Atari joystick needs to be modified to work in this scheme.

Thank you. That's what I thought.

Mark

As you can see on this link, many different joystick interfaces were created for the ZX81.

https://problemkaputt.de/zxdocs.htm#zx8 ... expansions