Re: Racal 9081 phase detector problems.
Have you checked the PROM inputs are all switching and confirmed if the PROM outputs are switching?
PSU for PROM can fail.
Is your PROM on-board, or on the digital board? If on the digital board the connecting cable could be a problem.
I have only had two PROMs fail in about 15 units.
I had manufactured some EPROM boards a few years ago. They were only intended for my own use though. I will need to review them before I could offer one.
My board replaces the PROM, the multiplexer, the level converters and the logic gates. I cant remember if I re-programmed the EPROM to just fire three outputs High, LOW and MIDDLE directly from the inputs, so I need to re-visit what I actually did.
My MK1 replacement board was a PIC PROM simulator which also worked well.
I have also just moved from Windows machine to Linux, so have to see if I can get my EPROM programmer to work.
Also need to get KiCad working again!
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