I was dismantling some old stuff that I got as a lot and came across
this beastie.
It's a National Semiconductor Microcomputer Systems BLC 80/10.
Clone of an Intel iSBC 80/10.
Single board 8080A computer with sockets for PROMs and 1K of RAM
onboard, several parallel ports, one serial port, and Multibus
interface for expansion. As used in this case, it was standalone with
only the power pins on the Multibus connected (and the I/O at the top).
As the only Multibus backplane I have is an IRIS 3000 series
(double-deep), it's available.