Sinclair ZX80 / ZX81 / Z88 Forums

A fairly early working issue one but no outer box sadly.


Bugged ROM so I will need to swap that out if I want to fit a Wespi to this.

A very nice boxed (kind of) issue one zeddy. A pretty good picture using RF as well!

With a cool yellow PCB with a 622 ROM and (now) 16K of RAM.

A poorly issue one. At least all the important chips are socketed!

A quick chip swap and now it boots nicely to the K prompt.

The Z80. I’m pretty sure now that I have had way more failed Z80s than ULAs. Which is certainly the better option of the two!

Another working yellow issue one with a 622 ROM:


Both this and the one further up have 8142 dated RF modulators, yellow boards and the same intermediate 622 ROM. Wonder if they were part of the same production run?

A nice brown postal boxed issue one with cool keyboard that seems fine:


It came with a Special RAMPack from Audio Computers which boots up and survives the DIM A(3000) test so is probably Ok. If I can open it without damage I will post photos of the insides.

I have been corresponding with another forum member re that particular rampack which it seems had an EPROM board add on for it, more info here...

https://k1.spdns.de/Vintage/Sinclair/80 ... 20Rampack/

Moggy wrote: ↑Fri Jun 24, 2022 2:55 pm I have been corresponding with another forum member re that particular rampack which it seems had an EPROM board add on for it, more info here...

https://k1.spdns.de/Vintage/Sinclair/80 ... 20Rampack/

Thanks! I was wondering about the empty socket.

https://sinclairzxworld.com/viewtopic.p ... 228#p47228


Mine does appear to be a slightly different version - still has a socket but no beeper connector etc.

Obviously mine is the ‘NOT QUITE SO’ SPECIAL RAMPACK.

Picture of the insides:


Nice RAM chip!

Someone must have found a spare box of them SRAM chips in a warehouse, as that’s significantly older than the rest of the chips

Mark