Joe asks:
Anybody know what this is for? It's about 4 x
6" and has a 3 pin
power connector, a 2 pin connector for a reset signal and ONE 7
segment display. There is no other connectors or I/O. It has the part
number 64783-66502 on it but I can't find anything from HP with a
65783 model number.
It's most likely a test/demo target for the 64700 in-circuit-emulator.
You'd need a 64700 with the 68040 pod and probe for it to be useful.