"Different" ZX81's

Discussions about Sinclair ZX80 and ZX81 Hardware
Lardo Boffin
Posts: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: "Different" ZX81's

Post by Lardo Boffin »

It's definitely going to get built. Whether I am brave enough remains to be seen - I will decide after reading the instructions a few times. On the plus side I have a number of working examples to cross reference! Although they all have subtle differences...

I don't have any of the computers I had back in the day so building this one knowing it has never been used will feel a bit like buying one from new in a weird kind of way. It will be MY computer - not a second hand one that I bought off some random on eBay. Although I am very grateful to various randoms!

Plus it is VERY shiny! I have seen quite a few zeddy motherboards now and this is far and away the nicest condition. :D
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: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: "Different" ZX81's

Post by Lardo Boffin »

Andy Rea wrote: Sat Sep 09, 2017 11:30 pm Build it.... would be a shame.to.let it rot unused :mrgreen:

I had a kit once.....
What happened to your kit? Dare I ask?
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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Andy Rea
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Joined: Fri May 09, 2008 2:48 pm
Location: Planet Earth
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Re: "Different" ZX81's

Post by Andy Rea »

Lardo Boffin wrote: Sun Sep 10, 2017 12:28 am
Andy Rea wrote: Sat Sep 09, 2017 11:30 pm Build it.... would be a shame.to.let it rot unused :mrgreen:

I had a kit once.....
What happened to your kit? Dare I ask?
I built it of course :lol: :lol:
what's that Smell.... smells like fresh flux and solder fumes...
Lardo Boffin
Posts: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: "Different" ZX81's

Post by Lardo Boffin »

Andy Rea wrote: Sun Sep 10, 2017 12:34 am
Lardo Boffin wrote: Sun Sep 10, 2017 12:28 am
Andy Rea wrote: Sat Sep 09, 2017 11:30 pm Build it.... would be a shame.to.let it rot unused :mrgreen:

I had a kit once.....
What happened to your kit? Dare I ask?

I built it of course :lol: :lol:
Excellent!
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: 3231
Joined: Wed Jun 18, 2008 2:00 pm

Re: "Different" ZX81's

Post by Moggy »

Andy Rea wrote: Sat Sep 09, 2017 11:30 pm Build it.... would be a shame.to.let it rot unused :mrgreen:

I had a kit once.....
And we all know what happened to that!
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Andy Rea
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Re: "Different" ZX81's

Post by Andy Rea »

is that Uhura's console ?
what's that Smell.... smells like fresh flux and solder fumes...
Lardo Boffin
Posts: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: "Different" ZX81's

Post by Lardo Boffin »

Well, I haven’t posted a zeddy in here for a while so here’s one!

157526E5-B4D6-411C-BB33-425AEE64181F.jpeg
(705.61 KiB) Downloaded 259 times

Another lovely condition issue three. It’s in such a nice box and general condition that I think I might keep this one mostly original and just zx8-ccb it. It even comes with the original till receipt and accompanying guarantee from John Menzies (the till receipt number matches on the receipt card) - very nice collectible one this!

Check out the logo - this one can’t have been out of its box much!
80AE1A5C-AA48-4925-9FE2-61B10BD4098B.jpeg
(3.55 MiB) Downloaded 259 times
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: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: "Different" ZX81's

Post by Lardo Boffin »

And here is another one - nice RAM chip!
C83C8EA2-0E07-4F9E-B0F0-A46667B7926F.jpeg
(994.59 KiB) Downloaded 206 times
Lardo
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: 3231
Joined: Wed Jun 18, 2008 2:00 pm

Re: "Different" ZX81's

Post by Moggy »

The ROM chip looks a bit different from normal too.
Lardo Boffin
Posts: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: "Different" ZX81's

Post by Lardo Boffin »

Is the M for Motorola?

I was going to put 16k of RAM in this one before rehoming it but don’t want to destroy the chip! Call me a sentimental old fool!
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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