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Discussions about Sinclair ZX80 and ZX81 Hardware
JohnyC
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Joined: Sun Jan 12, 2014 5:31 pm

New member

Post by JohnyC »

Hi guys,

I'm from South Africa and have discovered recently a ZX80 lying in dust at work for 20 years plus. Thought I share a couple of pics. Sorry if this is in the wrong forum section. I attached the pictures, hope it shows. Regretfully no power supply.

Regards
Johan
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Moggy
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Joined: Wed Jun 18, 2008 2:00 pm

Re: New member

Post by Moggy »

Hi Johan and welcome to the forum. :D

God I wish I could find things like that at work!!
A nice ZX80 You have there but with the ZX81 keyboard overlay which suggests it was upgraded some time in its life with the ZX81 ROM chip.

Still extremely desirable for Sinclair enthusiasts and usable even today, look here for more details...

http://www.sellmyretro.com/category/Ret ... clair+ZX80

Again welcome aboard Johan


Regards.

Moggy.
sirmorris
Posts: 2811
Joined: Thu May 08, 2008 5:45 pm

Re: New member

Post by sirmorris »

Hi Johan,

Welcome :D I'm in total agreement with Moggy - What a find!! Congratulations :mrgreen:
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iturbez
Posts: 154
Joined: Fri Dec 25, 2009 1:06 pm
Location: Spain

Re: New member

Post by iturbez »

Hi, Johan.
Welcome to the forum.
You're a lucky man. What a precious piece of hardware! :o :o :o
JohnyC
Posts: 4
Joined: Sun Jan 12, 2014 5:31 pm

Re: New member

Post by JohnyC »

Thanks for the kind words!
I will try to get it to work again, will let you know!
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yerzmyey
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Location: Rubber Planet
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Re: New member

Post by yerzmyey »

Hi there.

Well, should be possible to get the proper power-supply after all. Check out the data on Internet and take the machine to some electric shop. Somebody should be able to match a proper PSU for You.

PS: It's easy to advise but harder to take own advice, hahah - for weeks now I should do the same with one the newest ZX Spectrums - Speccy2010 - and cannot force myself. ;)
IN NIHILUM REVERTERIS - a big text-adventure game for ZX81: http://tiny.pl/g2m6m
"MONOCHROME" issue 5 - (Spring 2014) free paper/PDF magazine about ZX81: http://tiny.pl/q2m44
ZX81 COMPETITIONS 2007/2009: http://zx81.republika.pl/
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1024MAK
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Location: Looking forward to summer in Somerset, UK...

Re: New member

Post by 1024MAK »

Welcome on board Johan!

:D :D :D

The most important thing about any replacement power supply, is that the polarity is correct. The tip must be positive (a 3.5mm mono jack plug is used).
The voltage should be between 8V DC and 10V DC. It can be an unregulated or regulated type. It should supply at least 500mA (0.5A) (a higher current rating is okay). If using the 16k RAM pack, an unregulated 9V power supply rated at 700mA (0.7A) or more is recommended.

More details here :mrgreen:

Mark

Edited due to, well, a silly error. For some stupid reason I wrote 2.5mm mono jack plug instead of 3.5mm :oops:
Last edited by 1024MAK on Sat Jan 18, 2014 1:53 am, edited 1 time in total.
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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Paul
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Re: New member

Post by Paul »

Also welcome!
Actually it's a 3,5mm plug, not 2,5mm
Kind regards
Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
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1024MAK
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Location: Looking forward to summer in Somerset, UK...

Re: New member

Post by 1024MAK »

Paul wrote:Also welcome!
Actually it's a 3,5mm plug, not 2,5mm
Kind regards
Paul
D'oh! Image What was I thinking :oops: - I did know that! All the jack sockets on the Sinclair ZX machines are 3.5mm.

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.
JohnyC
Posts: 4
Joined: Sun Jan 12, 2014 5:31 pm

Re: New member

Post by JohnyC »

Hi guys,

Strange as it may seems I cannot get hold of a power supply with the correct socket. I live in a quite small town with not much electronic/electric hardware stores. Maybe it is better to let it go. If one of you like to make me an offer let me know. Please keep in mind I am from South Africa ;)
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