Thanks for the help.
I found the fault. The ULA-socket was bad.
Christian
Search found 3 matches
- Thu Mar 26, 2020 5:50 pm
- Forum: Hardware
- Topic: ZX81 repair help needed - strange fault!
- Replies: 8
- Views: 2781
- Thu Mar 26, 2020 12:59 pm
- Forum: Hardware
- Topic: ZX81 repair help needed - strange fault!
- Replies: 8
- Views: 2781
Re: ZX81 repair help needed - strange fault!
Hi, I tested all chips in the working zx81. I stored the faulty zx81 about 3-4 years ago in working condition. I replaced at this time the old ULA to the new model 210E for a better picture. When I now powered on the zx81 the first times I was able to press a 0 or some other keys - all chars appear ...
- Thu Mar 26, 2020 8:05 am
- Forum: Hardware
- Topic: ZX81 repair help needed - strange fault!
- Replies: 8
- Views: 2781
ZX81 repair help needed - strange fault!
Hello, I hope to get some help here - I normally repair Commodore or Atari - Sinclair is new for me ;) One of my two zx81 shows the "K" but the second pixel from right is a vertical line (white because of the reverse K). If I press any button I get these verical stripe over the whole screen and they...