ZX81 main board

ZX80 / ZX81 hardware and software requested for either sale or swapping
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albertusj
Posts: 58
Joined: Sat Aug 18, 2012 12:44 am
Location: Somerset-West, South-Africa
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ZX81 main board

Post by albertusj » 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.
ZX80/ZX81/ZX Spectrum

Lardo Boffin
Posts: 1046
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 main board

Post by Lardo Boffin » Mon Jul 01, 2019 9:03 pm

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!
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

Lardo Boffin
Posts: 1046
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 main board

Post by Lardo Boffin » Fri Aug 16, 2019 9:17 am

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
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

Lardo Boffin
Posts: 1046
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 main board

Post by Lardo Boffin » Fri Aug 16, 2019 10:16 am

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
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

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