Sinclair ZX80 / ZX81 / Z88 Forums

Looks like it was the DC Barrel connector, I swapped it from another Spectrum that is undergoing repairs and the display stays birght.. I suspected the barrel because the system would not power on properly if the Adapter was plugged all the way in. New barrel has been ordered and added to the list o...

I have been in touch with the original owner of the zeddy. Turns out he lent it to someone who used the worng power supply on it, probalby with a center negative plug, this is probably what blew out the ULA.

I have a rubber key spectrum which I have been restoring. I received the system along with a ZX81 and a +3 model both of which have now been restored to full working order and I thought I had done hte same with the rubber key model. The machine has had capacitors replaced, a new keyboard and membran...

I've had this ZX81 sitting in a box for about 15 years gathering dust and after regaining ym interset in old 8 bit computers after repairing a few other machines I thought I'd give this a go. There was no PSU with it so I hacked one togethor from a 9V 1A adaptor and a 3.55mm power plug from an even ...

HI all, I've decided to take up the hobby of old 8 bit computers after getting my old Amiga 1200 fixed up and pimped out to the maximum my budget can afford (By god those things are getting expensive!) I shifted my focus to the older machines and currently have working a Dragon 32, a Spectrum 48 (ru...