My first ZX80.
- Muttley Black
- Posts: 48
- Joined: Thu Apr 18, 2019 7:54 am
My first ZX80.
Hello all!
I just buy my first ZX80 and I am more than happy.
Motherboard is issue 3. I get this as untested and I am looking forward to make this beauty healthy again.
There are a special schematic for issue 3?
My zx80 have marked as USA but this is UK keyboard am i right?
Thank you.
I just buy my first ZX80 and I am more than happy.
Motherboard is issue 3. I get this as untested and I am looking forward to make this beauty healthy again.
There are a special schematic for issue 3?
My zx80 have marked as USA but this is UK keyboard am i right?
Thank you.
Re: My first ZX80.
I notice the diode marked D11 has been removed so I assume this will work as is on UK TV, or does the modulator make a difference?(question aimed mainly at Mark when he sees this)
This thread may be useful to you...
https://www.sinclairzxworld.com/viewtop ... f=7&t=3266
This thread may be useful to you...
https://www.sinclairzxworld.com/viewtop ... f=7&t=3266
Last edited by Moggy on Fri May 22, 2020 3:03 pm, edited 1 time in total.
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: My first ZX80.
Moggy got there first
[Besides, viewing detail in photos on a small screen is not easy...]
Mark
[Besides, viewing detail in photos on a small screen is not easy...]
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.
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.
Re: My first ZX80.
Sorry Mark I've added a question about the modulator does it make a difference or is it just the diode?
- Muttley Black
- Posts: 48
- Joined: Thu Apr 18, 2019 7:54 am
Re: My first ZX80.
Thank you both.
Mark I add better photos when I got it in my hands.
The beauty still traveling!
What about the schematic for issue 3?
Thank you
Mark I add better photos when I got it in my hands.
The beauty still traveling!
What about the schematic for issue 3?
Thank you
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: My first ZX80.
We only have one schematic for all ZX80s as far as I know. This is the schematic (or a redrawn version) of that which Sinclair provided with the kit ZX80s. My ZX80 has an issue 2 board.
The different modulators (normally VHF for the USA and UHF for Europe) only affect the allocated frequency for a (nominal) ‘TV channel’ (in Europe its channel 36). This does not affect the 625 line / 50Hz or 525 line / 60Hz video format. But obviously for the VHF modulator, if a using RF/aerial connection, your TV must be able to receive VHF channels.
On the keyboard, as far as I know, there was only ever one layout.
Mark
The different modulators (normally VHF for the USA and UHF for Europe) only affect the allocated frequency for a (nominal) ‘TV channel’ (in Europe its channel 36). This does not affect the 625 line / 50Hz or 525 line / 60Hz video format. But obviously for the VHF modulator, if a using RF/aerial connection, your TV must be able to receive VHF channels.
On the keyboard, as far as I know, there was only ever one layout.
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.
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.
-
- Posts: 2173
- Joined: Sat Nov 26, 2016 2:42 am
Re: My first ZX80.
This is a link to a scan from assembly instructions:
https://www.sinclairzxworld.com/viewtop ... 894#p36894
https://www.sinclairzxworld.com/viewtop ... 894#p36894
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
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
- Muttley Black
- Posts: 48
- Joined: Thu Apr 18, 2019 7:54 am
Re: My first ZX80.
Great. Thank you for the info
- Muttley Black
- Posts: 48
- Joined: Thu Apr 18, 2019 7:54 am
Re: My first ZX80.
Yesterday i got it in my hand's. I buy it as Untested.
here are some photos
And some from inside
And this is what i get in my screen.
This beauty need a repair
here are some photos
And some from inside
And this is what i get in my screen.
This beauty need a repair
Re: My first ZX80.
Congratulations Muttley Black on your splendid looking 80.
I'm sure Mark will be along with some sage advice on how to proceed( he saved my 80 from the scrap pile).
A few observations.
The ceramic caps and resistor around the EAR?/MIC sockets seem to have been added as a rudimentary hi pass filter to improve LOAD/SAVE which I have always found unnecessary as the 80's output is much louder than say the 81, and I never had a problem with tape LOAD/SAVE although now I use the ZXpand with my 80.
The cap on the power socket I would suggest is just for removing any spikes on the supply line.
I notice also you have plugged it into a modern LG LCD TV. I would be surprised if you got a picture of any sort as without modification the humble 80 really is really more used to being used with a CRT TV.
With a Modern LCD set I could never get a picture through the modulator so in the end modified it for composite output.
I look forward to seeing this little gem being fully restored please keep us informed of progress.
Regards.
Moggy.
I'm sure Mark will be along with some sage advice on how to proceed( he saved my 80 from the scrap pile).
A few observations.
The ceramic caps and resistor around the EAR?/MIC sockets seem to have been added as a rudimentary hi pass filter to improve LOAD/SAVE which I have always found unnecessary as the 80's output is much louder than say the 81, and I never had a problem with tape LOAD/SAVE although now I use the ZXpand with my 80.
The cap on the power socket I would suggest is just for removing any spikes on the supply line.
I notice also you have plugged it into a modern LG LCD TV. I would be surprised if you got a picture of any sort as without modification the humble 80 really is really more used to being used with a CRT TV.
With a Modern LCD set I could never get a picture through the modulator so in the end modified it for composite output.
I look forward to seeing this little gem being fully restored please keep us informed of progress.
Regards.
Moggy.