Board 2
Says Digicard D-Net and has a wire that goes to a board in slot 1.
biggest chip is
an am8530h-
6pc
THe 8530 is a complex sync/async serial chip IIRC. It's the one used in
the Macintosh, etc. This could be some kind of network card (based on the
name), although it may well not use any well-known protocol.
Bet this is an appletalk network card. Rare birds, those.