Sinclair ZX80 / ZX81 / Z88 Forums

On the board there are some tuners once the composite mod has been done they can be adjusted to tweek display vertical hold and colour match. Note make a mental note of where the setting is before starting you should use this method carefully moving the setting in slight increments then test

Hi all I know i am late in the game at pumping my Spectrum but i thought i'd share some results. List of mods so far: Added on off switch Added power LED Added custom white keyboard Added "always cool" regulator - out with heat sink Replaced all capacitors Changed output to composite Replaced keyboa...

You have enough heat sinks to cool down the wife.. what a star

Anybody know of any other ROM's that can fit our humble ZX81 board?

:lol: - "64k ZX81" - "RTI" Eeprom… ??? Just a fake picture (it's a sticker added on the component) and the background (grey) had been rerive from a deleted sérial number(white sticker in the UV window deleted too! !photoshop! ). It's a good Joke. This wasn't a Photoshop, real life Sinclair weird mo...

Many thanks im developing a custom zx81 and spectrum and hope to share some pictures with you. I have started by changing the regulator. To reduce the heat output by 98% reducing excess wear on the machines capacitors photis to follow

You could just simplify things and retro fit a 128 board inside a 48k case which maybe 1. Cheaper 2. Less risk of damaging. Was there any ram packs made for the 48 or 16k spectrum? If so a clue to further expansion could be found inside. 64 ram packs were produced for the zx81. It wouldn't surprise ...

How much do they go for, i just see the cases... is the developer contactable?

Hi thought id inspire some conversation here. What is your must have tip or Sinclair easter egg?

Mine is as follows... did you know you get an extra foot on the 2nd edition Spectrum? Crazy but true Sinclair research used one stuck on a chip inside the case!

:l

Hi all, can anyone confirm was this a regular fit by Sinclair?

See attached screen shot with the two red wires indicating modification.

Thanks!