However, that was not the end of the troubles. I discovered, that although the Mod 8 seemed to work correctly, it could not read 1702 or 1702A EPROMs in the ZIF socket. It turned out that one of the 1N270 diodes (D7), was defective. Once that was replaced. All seemed good. Now the only test that remained was to try and burn an EPROM. For some reason that didn't seem to work. The 48V programming voltage was not making it's way into the socket for some reason. At this point, I am leaving that debugging for another day.