Sinclair ZX80 / ZX81 / Z88 Forums

Hello all

I am finally the proud owner of a ZX80. It works but the output on my telly (even an old CRT) is predictably poor.

Are there any non-invasive methods of improving the output? Its is such nice condition I don’t want to open the case.

By way of example there is the Chroma 81 for the ZX81 - is there anything similar for the ‘80?

ZX8-CCB can be used
I upgraded the ZX80 that Richard owned. I put the ZX8-CCB in the modulator can as that was what was requested. But you don’t have to do that.

Chroma 80 interface (coming soon) according to Paul’s web site...

Mark

Thanks Mark. I will wait for the Chroma 80. I really don’t want to make any changes to this one.

I had great success with the 555 based back porch generator from:

http://zx.zigg.net/misc-projects/

It works very well. Granted it is a bit more complicated, but if you add an external power source you won't have to open your ZX80 up at all. Here it is working on my ZX80:

http://www.myprius.co.za/ZX80kit/100_6219.JPG

Thanks for that. So it takes the normal signal directly from the ZX80 and improves it without any case opening? Impressive!

I think that circuit only works on the composite video signal, not the RF (UHF) TV aerial signal.

Mark