I have a card in my 512 which increases memory and
gives a SCSI port.
It's called a MacSnap by Dove computer, dated 1985. It actually consists of
2 cards. One contains the memory chips aand circuitry and the other has
the SCSI socket and also 2 large chips labelled upper and lower ROMs. I'm
even able to boot off the external HDD.
Great product, I used mine with a Cutting Edge 30MB external drive
until the drive's piggyback OMTI SCSI <=> MFM adapter went south.
Anyone know where I can get one of these tiny adapters?
-dq