Lardo buys another zeddy

ZX80 / ZX81 hardware and software offered for sale or swapping
Lardo Boffin
Posts: 2118
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin »

An extremely nice issue one bugged ROM with working keyboard.

And mic for some reason…

IMG_2183.jpeg

Edit : 8119 ULA. Fairly early but far from the earliest.

IMG_2184.jpeg
Last edited by Lardo Boffin on Wed Jun 14, 2023 3:21 pm, edited 1 time in total.
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
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Flatulentia
Posts: 93
Joined: Sun May 14, 2023 3:58 pm
Location: Cambridgeshire, UK

Re: Lardo buys another zeddy

Post by Flatulentia »

I was watching that listing and wondered what the extra weird looking device was. I'd guessed it looked like a microphone of some kind, so thanks for confirming it.

I won the auction for the other similarly good looking one that went for £31 delivered. Fractured keyboard tails (I can probably get away with cutting those back) but otherwise mint with a great looking UK700 PSU and manual. :)

IMG_20230614_142606_scaled.jpg
ZX81 with ZiLOG Z84 CMOS Z80, 32KB battery-backed Toshiba 55257 SRAM with charge status LED, Wilf's "Why Wait?" mod and switch-mode 5V regulator. 50/60Hz mode switch, composite video output with Zigg's back porch mod and 1080p60 HDMI output.
Lardo Boffin
Posts: 2118
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin »

A couple of boxes waiting for me when I got back from work:

IMG_2487.jpeg

The sleeve zeddy works, as does the RAM pack. The postal box zeddy doesn’t boot sadly. Its a kludge fix so fairly early.

All in very nice condition.
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Lardo Boffin
Posts: 2118
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin »

A couple more…

One boots and works fine the other just gives a white screen. The Memopak works fine.

IMG_2837.jpeg
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Lardo Boffin
Posts: 2118
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin »

The zeddy in the full box is a slightly unusual issue one:

IMG_2842.jpeg
IMG_2843.jpeg

I don’t remember having a USA zeddy like this before (although probably have all things considered…)

Having trimmed the keyboard membrane this now seems to be working well and gives a great picture!
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Moggy
Posts: 3187
Joined: Wed Jun 18, 2008 2:00 pm

Re: Lardo buys another zeddy

Post by Moggy »

Looking at those inductors just above the reg' I would say this a Sinclair made US ZX81 board, as opposed to a Timex TS100 one, that's been played around with, ( IE had it's conductor strip removed and a UK modulator fitted ), and stuffed into a UK case. Never seen red solder mask on a standard UK board either.
Last edited by Moggy on Tue Aug 01, 2023 10:07 pm, edited 2 times in total.
Lardo Boffin
Posts: 2118
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin »

The non-working zeddy is a beige PCB with a 649 ROM!

Makes a change from the usual 622 / beige combination I seem to get. This one has a ULA several weeks later than those with the 649.

IMG_2844.jpeg

Now to try to get it to boot…
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Lardo Boffin
Posts: 2118
Joined: Sat Nov 26, 2016 2:42 am

Re: Lardo buys another zeddy

Post by Lardo Boffin »

Moggy wrote: Tue Aug 01, 2023 10:01 pm Looking at those inductors just above the reg' I would say this a US board that's been played around with, ( IE had it's conductor strip removed and a UK modulator fitted ), and stuffed into a UK case. Never seen red solder mask on a standard UK board either.
I did wonder about that. Maybe they were short of boards.
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Moggy
Posts: 3187
Joined: Wed Jun 18, 2008 2:00 pm

Re: Lardo buys another zeddy

Post by Moggy »

I've edited my post to say that I think it's a Sinclair board made for the US and not a Timex one and has been butchered for UK use.
Moggy
Posts: 3187
Joined: Wed Jun 18, 2008 2:00 pm

Re: Lardo buys another zeddy

Post by Moggy »

I must be getting slow in my old age! :oops:

The motherboard actually has Sinclair ZX81 USA printed on it DOH! :lol:
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