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#classiccomputing

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Though i played those "Early Gen X" consoles with friends or older cousins, the first ones that were "mine" were "Core Gen X". It was the Apple IIe, the Atari VCS, and the 4MHz IBM PC clone that really captured my heart. And we used the Commodore PET at school.

Which one was yours?

Oh well, I fnished the ZX81 plus 38 mainboard but it's *NOT* working.

I do not get any composite video signal out. There's not even a black screen!

I already followed all the hints in the manual:

I checked the logic ICs and they all get 5V from the power supply, as is expected.

The I checked the clock signal on the various ICs as recommended by the troubleshhoting section of the manual. I used my Hantek oscilloscope to check and the clock signal is active and can be measured at the ICs mentioned in the manual.

Anyone who finished this build successfully got a hint where to look next?!

#dudebuildingazx81
#ZX81
#ZX81plus38
#Sinclair
#Replica
#RetoComputing
#ClassicComputing