Sinclair ZX80 / ZX81 / Z88 Forums

Thanks LARDO. Much appreciated. I am among friends

I was a nerdy 11 yr old in 1981. Glad in retrospect!!

Wow, I wasn't expecting such an in depth response 1024MAK. That's brilliant. I didn't realise the chip nos. were set out that way. I know from watching videos that Sinclair were clever in buying chips on the cheap. I will check the modulator cap. I had already done the MOD before I took the photos. ...

Thanks for letting me join the forum. Got a ZX81 issue 1 dated 1980 (1st ZX81 came out in March 1981) (3 photos attached) I've got a few questions you might be able to shed light on (referring to the photos). 1) The board predates the original launch date which makes sense and it has hand traced etc...