Sinclair ZX80 / ZX81 / Z88 Forums

Moggy wrote: ↑Fri Mar 05, 2021 8:38 pm A toast also to Lardo whose most excellent refurbished zeddies will probably be around for another 40 years.

Just standing on the shoulders of giants.

Happy days!!!

I think you have to replace all caps initially. Then replace C28 with a 47uF capacitor (original is 22uF, right of the 5 way keyboard connector) Replace caps C7 and C8 with 1uF ceramic capacitors (next to IC12 and IC13 RAM chips, bottom left of the board). You could also add 1uF caps underneath the...

For jailbar reduction you could add caps to the memory chips.. https://youtu.be/R_E3eX3Gtas The vertical white lines was something I came across before, the RGB signal was too strong for the monitor, and I was able to adjust monitor settings to fix https://m.facebook.com/story/graphql_permalink/?gr...

Does seem a ‘little’ (lot) excessive!

It will probably be worth cleaning the legs on the Mostek RAM - they always seem to tarnish badly.

Your second one has a quite early ULA at 8106. Nice. As most of the chips are socketed you could try swapping them around and may get a working zeddy. Thanks, but I'd rather repair them both. Gotta keep these 8bit machines running! I keep buying BBC's as 'spares' machines. But so far I've managed t...

Your second one has a quite early ULA at 8106. Nice.

As most of the chips are socketed you could try swapping them around and may get a working zeddy.

Welcome on board!
To be a bit controversial I quite like the Apple II and have a Europlus I am in the process of getting usable. I used to go round a friends house and play Bard’s Tale and Wizardry on one a lifetime ago so its a nostalgia thing.

Bump!