Bugged ROM issue one ZX81 up for sale

ZX80 / ZX81 hardware and software offered for sale or swapping
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Lardo Boffin
Posts: 1044
Joined: Sat Nov 26, 2016 2:42 am

Bugged ROM issue one ZX81 up for sale

Post by Lardo Boffin » Fri Jun 21, 2019 11:09 pm

I recently bought a ZX81 from a popular auction site and it turned out to be an issue one with the very early bugged ROM. Photos on here of the PCB along with the result of PRINT SQR 0.25. viewtopic.php?f=7&t=2153&start=190#p34185

I don’t like to refurb these early ones before offering them up on here in case anyone is looking for one.

It has an early ULA - 8112.
It has what looks like an early PSU.
It has the early cassette cables and RF lead for the TV.
The keyboard membrane has had it and definitely needs replacing.

The case is in fair condition but is missing a screw and has no feet. I will put in a set of softer sponge feet - this is the sort that most likely would have been fitted.

I have tested it with a 16K RAM pack plugged in and loaded The Gauntlet. I did the same with a ZXpand.
I was using a ChromaSCART and my Memotech keyboard for testing with.

Included in the sale:-
ZX81 with bugged ROM
PSU and cables.
Set of soft foam feet.

If anyone is interested or wants more details please message me. It will be £25 plus p&p from the UK. I’m happy to post abroad but it can get expensive. Buyer to pay import taxes etc. Sorry, went into eBay mode there! :oops:

Some photos
C4EAF7E8-B4A2-43EB-A74A-7BDC595F407F.jpeg
E3388FDA-8D17-435A-8043-81EBB30E539D.jpeg
73642671-C7F9-405E-997F-A39133B43312.jpeg
D638FCDA-7321-47A7-9EDA-AD2B19370CCA.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

Lardo Boffin
Posts: 1044
Joined: Sat Nov 26, 2016 2:42 am

Re: Bugged ROM issue one ZX81 up for sale

Post by Lardo Boffin » Fri Jun 21, 2019 11:12 pm

Some more photos.

Running a zxpand:-
EE3AD818-D483-457A-A7ED-FC6BAEDDD1A2.jpeg

Loading The Gauntlet from tape:-
F039D094-19C5-4E60-AEDC-3335E37AC047.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

Lardo Boffin
Posts: 1044
Joined: Sat Nov 26, 2016 2:42 am

Re: Bugged ROM issue one ZX81 up for sale

Post by Lardo Boffin » Thu Jun 27, 2019 7:56 pm

Taken. :D
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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