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I think it's more likely it's a II Plus board, and not a particularly early one. (It's totally missing the 4k/16k jumper blocks, for instance.) Without getting my Plus down and taking a look I'm sort of inclined to say it's one of the post-1982 ones that says "Singapore" on the back, because that's what's in mine and it looks suspiciously like the same thing.Now, when was it made?![]()
Do you mean the big board to the left (looking from the rear) of the drive cage? No way that's a memory board. Notice how it has three ribbon cables coming off it, one of which goes to a slotted card in the motherboard (see below). That's pretty obviously an MFM-to... something, disk controller. I want to say that "something" is SASI, 1978's paleolithic predecessor to SCSI, but it could be something proprietary. (I don't think it's Corvus, it looks like that used fewer pins.)W
Anyways, Rant aside. I think the large board on the side is a memory expansion. To access the HDD, it would had to have a modified ROM so it can boot from it, or a special floppy to load the HDD drivers.
Given that it appears that this connected to the board above I'd say it's the host interface for the hard drive adapter board above.The board with a blue connector looks like a Printer card.