@Will-i-am:
Could you perhaps count the pins on the SCSI-ish and Floppy-ish connectors?
And tell us what is written on the small lables in the corner? Someone might recognize something, you never know..
From the picture i counted 60 pins on the larger one, and 48 or 50 on the smaller one (please confirm). This suggests that there might have been some sort of daughter-board plugging in there, or perhaps they are debug-connectors.
As for the Altera chips, they are IIRC programmable logic chips, often used in prototypes and amiga hardware, since it is cheaper than manufacturing custom chips in small quantities. They probably serve as 'glue-logic' between the A4000 motherboard and this board.
-Paul
P.S: It seems to be four 72-pin SIMM sockets there.
