Hello All & Dead ZX .. probably

thedevworks · Post by **thedevworks** » Tue Mar 05, 2019 4:03 pm

fair point that was worth trying, I tried on another TV and it was a little different.

Either.. A few times I got a very steady black screen (No cursor etc, just black)

the other times I got crazy noises and patterns like in the video

1024MAK · Post by **1024MAK** » Tue Mar 05, 2019 4:36 pm

Modern TVs, if they can’t detect the back porch part of the video signal, they get their auto calibration of the black video level wrong. This results in a very dark image even with the brightness and contrast turned up to full or nearly full.

Mark

thedevworks · Post by **thedevworks** » Wed Mar 13, 2019 6:10 pm

Oh well, I tried first the CCB because it was the least disruptive, which didnt work, followed by a new ULA, which also results in the same video signal. I guess now the only thing left to do is replace the other chips!

thedevworks · Post by **thedevworks** » Thu Mar 14, 2019 12:31 am

Ok I was wrong, the new ULA does work!! Keyboard is a bit iffy, but for now, I'm happy!

thedevworks · Post by **thedevworks** » Thu Mar 14, 2019 12:33 am

1024MAK · Post by **1024MAK** » Thu Mar 14, 2019 1:12 pm

Good to hear that you are up and running (well, once you have sorted the keyboard)

Mark

Andy Rea · Post by **Andy Rea** » Thu Mar 14, 2019 5:58 pm

McKlaud wrote: ↑
Tue Mar 05, 2019 1:16 pm
Dishwasher would be better

i had a commodore pet universal main board ( from a cbm 4032 machine) in the kitchen sink... my missus thought i'd gone nuts... works a treat and is clean to boot now

Sinclair ZX80 / ZX81 Forums

Hello All & Dead ZX .. probably

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Re: Hello All & Dead ZX .. probably

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