ZX81 rebuild

Discussions about Sinclair ZX80 and ZX81 Hardware
Lardo Boffin
Posts: 977
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 rebuild

Post by Lardo Boffin » Tue Nov 20, 2018 11:25 am

Putting in Andy’s ULA solved the screen jump issue I was having in hi res games. Nice one Andy!

Original parts left:-

Motherboard - can’t do much about that
6.5 MHz resonator
Case - might try and make a custom one

I still need to get hold of a UHF modulator for less than £20 and put in an ear and mic socket.

C74D30EF-8958-4951-BC8A-D2DCD9E63829.jpeg
4671F3CC-FD40-4099-9021-B4FA522B5513.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

McKlaud
Posts: 244
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: ZX81 rebuild

Post by McKlaud » Tue Nov 20, 2018 12:21 pm

Good work. :mrgreen:

BTW I’ve got a few RF modulators in my spare parts drawer. Some of them should work fine, the others are broken. If you need one drop me a line.
Claudius
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User avatar
1024MAK
Posts: 2414
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: ZX81 rebuild

Post by 1024MAK » Tue Nov 20, 2018 4:21 pm

McKlaud wrote:
Tue Nov 20, 2018 12:21 pm
Good work. :mrgreen:

BTW I’ve got a few RF modulators in my spare parts drawer. Some of them should work fine, the others are broken. If you need one drop me a line.
Go on, send him a broken one. He loves fault finding on this Zeddy :mrgreen: :lol:

Mark

McKlaud
Posts: 244
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: ZX81 rebuild

Post by McKlaud » Tue Nov 20, 2018 5:31 pm

Hi Mark ;)

Now you can laugh out loud, because Lardo asked me for a faulty unit :mrgreen: :mrgreen: :mrgreen: :mrgreen:
Claudius
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Lardo Boffin
Posts: 977
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 rebuild

Post by Lardo Boffin » Tue Nov 20, 2018 8:41 pm

1024MAK wrote:
Tue Nov 20, 2018 4:21 pm
McKlaud wrote:
Tue Nov 20, 2018 12:21 pm
Good work. :mrgreen:

BTW I’ve got a few RF modulators in my spare parts drawer. Some of them should work fine, the others are broken. If you need one drop me a line.
Go on, send him a broken one. He loves fault finding on this Zeddy :mrgreen: :lol:

Mark
I aged 5 years in the time it took me to get this one working! :shock:

I only need a broken one for the case. 8-)
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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