[1] Of course
the only thing to make me think it's S100 is that the connectors
are the right type; there's a possibility that it's some totally random bus
specific to whatever system this is :-)
There are in fact several bus systems out there that use the 100-pin
edge connectors.
Two obvious ones being :
1) The Intel MCS8i. Although this is an 8080 system, the bus is not S100
compatible (I believe it pre-dates the S100 bus). Same edge connectors,
but narrower, more square, boards. When I wanted to make an I/O card for
my MCS8i, I used an S100 prototyping board, cut down.
2) HP DIO (HP9000/200 etc expansion bus). Same connectors, much smaller
boards, and, of course 68000-like signals.
But... not all of them use the same size board, or
have the connector
-tony