After being used as a wall-hanging for approximately 20 years, then surviving an intercontinental trip in my luggage, the Synertek SYM-1 is running. I think a few segments of the display are iffy, but it responds to the keyboard and beeps. Next step is to hook up the serial port.
These single boards sure do produce a lot of RFI. Waving the almost exactly ten year old radio near it produces howls and churrs.
Biggest problem I had was with the cheap hookup leads which had no continuity …