First board had no RAM, CPU, ULA, ROM or VIA, but there were sockets for all the missing chips. I got new ULA, CPU and VIA and borrowed 4164 RAM chips from my spare Spectrum, and the ROM from the other Oric mainboard. I checked the 5V line to be within tolerances. The image I’m getting on my Amstrad GT65 is as below. It is also buzzing.
The other one had all the chips accounted for, although I knew it was not working. I got a set of new 4164 RAMs and installed those on sockets. Also removed the ULA, put a socket and tried the new ULA. This one makes a chime (relay click?) upon startup. Picture is as below. 5V line is all right.
Which of the two boards is a better canditate for revival, and what would be the next thing to check out? I have a multimeter and logic probe that I can use.
Thank you in advance!