Sinclair ZX80 / ZX81 / Z88 Forums

For originality (in an Issue 1 Spectrum as it happens) I'm looking for a 1982 Zilog branded Z80 that is as close as possible to week 17. Perhaps someone has a socketed one of that date in a ZX81.

Happy to swap for a newer Z80 or to pay a fair price.

I have an 8204. CPUs were often earlier than the ULA so if nothing better comes along it may be an option?

I have only just got it so would have to test it properly first.


My issue one has an 8208 Z80 and 8214 ULA.

Yes, ok, thanks.

Does it work?

Erm wrote: ↑Thu Jun 03, 2021 7:17 pm Yes, ok, thanks.

Does it work?

I will check it out over the weekend. It boots to the K but thats all I know so far.

Lardo Boffin wrote: ↑Thu Jun 03, 2021 9:09 pm

Erm wrote: ↑Thu Jun 03, 2021 7:17 pm Yes, ok, thanks.

Does it work?

I will check it out over the weekend. It boots to the K but thats all I know so far.

Well, that's a good start.

It has happily run The Gauntlet and Rock Crush with a Chroma81, Memotech Keyboard and ‘Spand plugged in for about 10 mins so seems fine. Happy to soak test for an hour at some point if you want?


Hard to believe but the screen is actually white!

Thanks. Looks good them. Leave it on for an hour, but only if you have the time.

Erm wrote: ↑Thu Jun 03, 2021 11:58 pm Thanks. Looks good them. Leave it on for an hour, but only if you have the time.

It happily played The Gauntlet for best part of two hours.

Memotech keyboard. Oh yes I want one!