ZX81 kit assembly

Discussions about Sinclair ZX80 and ZX81 Hardware
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Lardo Boffin
Posts: 2169
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 kit assembly

Post by Lardo Boffin »

I only bought three this time! I can cut down any time I want to!
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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McKlaud
Posts: 337
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: ZX81 kit assembly

Post by McKlaud »

Lardo Boffin wrote: ↑Fri Sep 30, 2022 9:40 pm I only bought three this time!
But please be precise, the quantity was "fully loaded three 40-foot shipping containers" :mrgreen:
Claudius
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Lardo Boffin
Posts: 2169
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 kit assembly

Post by Lardo Boffin »

McKlaud wrote: ↑Fri Sep 30, 2022 9:45 pm
Lardo Boffin wrote: ↑Fri Sep 30, 2022 9:40 pm I only bought three this time!
But please be precise, the quantity was "fully loaded three 40-foot shipping containers" :mrgreen:
Sshhh! I was deliberately not mentioning a unit of supply. :shock:
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
Top
Moggy
Posts: 3266
Joined: Wed Jun 18, 2008 2:00 pm

Re: ZX81 kit assembly

Post by Moggy »

Lardo Boffin wrote: ↑Fri Sep 30, 2022 9:40 pm I only bought three this time! I can cut down any time I want to!
Oddly enough so did I!

Am I now a click-acholic? :?
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Lardo Boffin
Posts: 2169
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 kit assembly

Post by Lardo Boffin »

They are the best keyboards!
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
Top
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1024MAK
Posts: 5118
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: ZX81 kit assembly

Post by 1024MAK »

“We regret the degradation and interruption of the topic, we hope to resume normal service shortly…” :lol:

Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp

:!: Standby alert :!:
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb :!:
Looking forward to summer later in the year.
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Lardo Boffin
Posts: 2169
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 kit assembly

Post by Lardo Boffin »

:oops:
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
Top
sP1d3r
Posts: 122
Joined: Mon May 16, 2022 9:20 am

Re: ZX81 kit assembly

Post by sP1d3r »

I tried the assembled kit on my Performa Apple TV card with a vLA81 and it worked, I'm glad to say.
Success!
Success!
Unfortunately, I was testing another ZX81 issue 1 with a ZXvid composite mod and when I tried to pull the RCA cable out of the back of the Performa the whole motherboard tray came with it because the screws weren't tightened up and the computer shut down.
Although it started back up ok the screen started flickering like there's some interference, so I might've done something to it! :o :(
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mrtinb
Posts: 1910
Joined: Fri Nov 06, 2015 5:44 pm
Location: Denmark
Contact:
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Re: ZX81 kit assembly

Post by mrtinb »

Not much contrast there.
Martin
https://zx.rtin.be
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
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1024MAK
Posts: 5118
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: ZX81 kit assembly

Post by 1024MAK »

That picture (link) looks just like the symptoms of a ULA that does not generate a back porch signal, displayed on a device that needs the correct back porch signal to automatically calibrate its contrast to the correct values.

Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp

:!: Standby alert :!:
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb :!:
Looking forward to summer later in the year.
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