Hi Drtaylor, one more question:
In the switch test diagnostic of the 8060A, the buttons each have a binary value when depressed, 8, 4, 2, and 1, respectively. The sum of the depressed buttons is displayed, so dB+REL displays a 5 for example. But these can sum together to higher than 9: in hexadecimal notation, you would still have just one digit, but it goes to 0xA, 0xB, etc.
The 8060A doesn't display "A" on the 7-segment display, it looks more like "o". Was this o symbol used for any actual purpose? It seems strange for its only purpose in life to be a diagnostic!