Sinclair ZX80 / ZX81 / Z88 Forums

I'd definitely be interested, don't mind prepaying or even buying a kit to solder myself

http://i.imgur.com/E2daO2M.jpg DahDah forgive the mess, just installed Pokemons ZX81 backporch mod board which arrived this morning, Have left the modulator in place just disconnected it hence the trailing composite lead. At first I thought I'd messed up as screen was still black, so increase the b...

Good points Mark, a lot of people stuff there power supplies down the back or hidden in a corner and then wonder why they get hot!
Or even coil cables up while on!

The heat generated by the transformer is wasted energy is it not? :p Even if there were vents to dissipated the heat. It would be very interesting to see a comparison of performance, might be an interesting experiment. There's many posts saying running on 9v allows the computer to run cooler and is ...

Paul wrote: ↑Thu May 11, 2017 9:01 pm

gozzo wrote: ↑Thu May 11, 2017 8:36 pm reversible if necessary.....

what could cause such requirement?

I don't understand why anyone would want to revert back to RF, Its an extremely poor quality source and totally outdated so I can see why anyone would want to go from composite to RF especially as the tvs capable of receiving this kind of signal are disappearing and one day will be gone, I have a CR...

Quick update, 16k RAM pack is fixed followed a guide on here to check systematically for faults, all voltages were ok, so I socketed all the ram chips, replaced all the caps, checked transistor, re-flowed all the solder joints... nothing Checked continuity on the ribbon cable, seemed ok but was a bi...

I think there are more than enough museum example zx81, spectrum and the like in the world... its not like they are uber rare, If people want to use them regularly they should be modernised with respect to the power train and video output so that they are more accessible and easier to maintain and k...

I have 2 zx81 power units, one marked uk700 the other uk1200 which unloaded give 16v and 13v respectively, both seem ok in use thou. Because older power supplies are inefficient and unreliable I'm basically replacing all my systems with modern 9v switching units and changing the internal 7805 to a s...

:mrgreen: On another Note, and I may get "STONED" for this too... Sooo, I am currently using... Dare I say it?... An ATARI 2600 WOODY Power Supply! :roll: It err, Does Work ! :mrgreen: Darren in OZ I do have a tip, don't be half asleep and too eager to test your newly refurbished woody 2600 that yo...