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ZX81 main board

Posted: Mon Jul 01, 2019 8:43 pm
by albertusj
I'm looking for a ZX81 motherboard/main board. I have a spare ULA and ROM if it needs.

Re: ZX81 main board

Posted: Mon Jul 01, 2019 9:03 pm
by Lardo Boffin
I have a spare main board / possibly two. I need to have a look and see how complete they are though! I will post some photos later and you can decide if they are of any use to you. No idea if they work.
They won’t have any chips but Z80s are easy to get. I get them from here

https://www.retroleum.co.uk/zx-spectrum-chips

I did have the vague notion I would keep them and strip and completely rebuild them (https://www.sinclairzxworld.com/viewtop ... f=7&t=2592) but the first go took up a year of my life so maybe not!

Re: ZX81 main board

Posted: Fri Aug 16, 2019 9:17 am
by Lardo Boffin
albertusj wrote:
Mon Jul 01, 2019 8:43 pm
I'm looking for a ZX81 motherboard/main board. I have a spare ULA and ROM if it needs.
I do have a complete zeddy if that helps.

viewtopic.php?f=8&t=3312#p34786

Re: ZX81 main board

Posted: Fri Aug 16, 2019 10:16 am
by Lardo Boffin
I also found this. It came to me like this but with some chips on it. Sold to me as untested! :roll:

The chips worked so fixed a couple of other zeddies. I was going to de-solder everything, post some hires shots of the PCB in case anyone needed them and then put it in a picture frame but if it is of any use it’s yours for p&p.

CAB4B15E-CF05-4B59-AAB1-4F07C87CA026.jpeg