Sinclair ZX80 / ZX81 / Z88 Forums

Does anybody have the Manual for this add-on for the ZX81? The manufacturers were a company called R.I.S.T., I found it but I forgot how to use it and I can't find the manual. Thanks.

OK, guys, here it goes. In the 70s and 80s of last century I was engaged in archaeological research and the work was going very slowly. Then the ZX80 was made available and I immediately bought it. It was great at the time and I used it for my research which got 10 times faster thanks to the program...

Hello, I had lots to do with the ZX81 in many ways as a user, I could share a long story of what I did with it and how it rewarded me in many ways, until the PCs appeared in the 90s and with sadness had to let go. If there is interest, I'll post it, otherwise I'll let sleeping dogs lie... Juan ( sor...