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SiriusHardware · 20th Sep 2022, 11:13 am

If you could just let us know whether your board is (or is not) the one in the first PDF in AJ's post #14, we'll be in a better position to advise.

One of the ICs you had out when cleaning up the PCB would have been the character generator ROM which is one possible cause of your display problem - if you could just make sure none of the ROMs have any of their pins folded over? I have been using DIP ICs for almost 50 years, and even now I sometimes get a pin out of line when inserting an IC into a socket.

20th Sep 2022, 11:13 am	#18
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,586	Re: 1978 Commodore PET project If you could just let us know whether your board is (or is not) the one in the first PDF in AJ's post #14, we'll be in a better position to advise. One of the ICs you had out when cleaning up the PCB would have been the character generator ROM which is one possible cause of your display problem - if you could just make sure none of the ROMs have any of their pins folded over? I have been using DIP ICs for almost 50 years, and even now I sometimes get a pin out of line when inserting an IC into a socket.