Sinclair ZX80 / ZX81 / Z88 Forums

thanks for the replies.
I have it working ia the composite input on a 80's computer monitor, though the lines are there, I can live with it.

I have the standard ZX power supply, AC adapter, outputis 9v DC AT 0.7A
Model UK 700

I'll also attach a photo, but I think the extra characters on that chip are
3N74L3VZN

Hi My first computer was a ZX81, bought new back in 1981, from memory. We eventually sold it and upgraded to a Commodore 64. Over the last few years, I've re-purchased another Commodore 64, a VIC 20 and also a ZX81. I have 2 ZX81's, in the hope that I can get one working properly, and get some 80's ...

Hi thanks very much for your reply. and yes I'll introduce myself on the forum. I have attached some more photos. The one from the screen isn't very clear, but you can see the vertical lines, ignore the dark diagonal one. I have connected the zx81 to a commodore monitor which has a composite input, ...

Hi I've got a ZX81 which has the composite video mod, and another which just has the standard TV output. See the photos When I connect the ZX81 which has the video mod, I get the K displayed on the bottom left, but also grey vertical lines on the screen. What is normally the cause of this? I read so...