Bugged ROM ZX81 up for adoption (PRINT SQR 0.25)

ZX80 / ZX81 hardware and software offered for sale or swapping
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Lardo Boffin
Posts: 842
Joined: Sat Nov 26, 2016 2:42 am

Bugged ROM ZX81 up for adoption (PRINT SQR 0.25)

Post by Lardo Boffin » Fri Oct 12, 2018 8:50 am

I got a ZX81 yesterday that I was going to refurbish and sell on but the seller had said it was a very early one he built himself so I tried PRINT SQR 0.25 and got this. :D

C5A5FBBD-9E04-44B0-9825-D7A967A42F65.jpeg

Its a bit battered and I have not even wiped it down yet but here it is.

79382BA2-5A59-4A7A-9CFF-DC9F9435182B.jpeg

I’m not about to refubish a piece of history so thought I would check to see if anyone on here wanted to adopt it? I already have one.

It cost me £30.95 and includes the PSU (not tested yet) and aerial lead, also not yet tested.

Am happy to pass it on for £30.95 plus p&p if anyone wants it?

The standard output was very dark so used my Chroma once I was sure it worked.

Will add some photos once it is clean.

I will also take photos of the inside if I can do so without damaging the keyboard as this also works.

PM me if interested. All I ask is that it doesn’t end up on eBay. :D

Lardo
ZX81 iss 1 (bugged ROM, kludge fix, normal)
Iss 3 with ZXVid, another in nearly perfect box
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: 842
Joined: Sat Nov 26, 2016 2:42 am

Re: Bugged ROM ZX81 up for adoption (PRINT SQR 0.25)

Post by Lardo Boffin » Sat Oct 13, 2018 10:10 am

Given it a bit of a clean.
D0326C2A-4F54-4096-A0F2-3CD75A68B48E.jpeg
EB895AD5-4FB6-449C-BC0E-01D989B3521D.jpeg
ZX81 iss 1 (bugged ROM, kludge fix, normal)
Iss 3 with ZXVid, another in nearly perfect box
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: 842
Joined: Sat Nov 26, 2016 2:42 am

Re: Bugged ROM ZX81 up for adoption (PRINT SQR 0.25)

Post by Lardo Boffin » Sat Oct 13, 2018 10:12 am

It has a First Edition manual, that is well used... One page has been sellotaped and there are a few ‘contemporary markings’ and a few finger prints here and there but it is fine as a ‘working’ copy. :D

0204CA8D-F835-4F55-BF0B-4CDF81F7CE0D.jpeg
8528B4CC-5747-44F8-B0FB-4BB764E55FDC.jpeg
017B8DFF-0195-49E7-B826-5030B6030120.jpeg
ZX81 iss 1 (bugged ROM, kludge fix, normal)
Iss 3 with ZXVid, another in nearly perfect box
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: 842
Joined: Sat Nov 26, 2016 2:42 am

Re: Bugged ROM ZX81 up for adoption (PRINT SQR 0.25)

Post by Lardo Boffin » Tue Nov 13, 2018 9:44 pm

Bump. Still here if anyone is interested?

Edit - taken.
ZX81 iss 1 (bugged ROM, kludge fix, normal)
Iss 3 with ZXVid, another in nearly perfect box
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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