I recently came across an Apple IIe at a junk sale with an interesting card that I cannot identify. I'm hoping you can help explain the purpose of this card. I found this card in Slot 7. This computer was an unusual configuration:
Aux Slot: Microsoft CP/M card
Slot 1: Standard Parallel printer card
Slot 3 or 4 (I don't recall): Super Serial Card
Slot 6: Standard Disk Controller
Slot 7: This mystery card
The weird thing is that the ribbon cables from the disk controller were connected to connectors on the mystery card, not to the disk drives. The ribbon cables from the disk drives (standard Apple Disk II Drives) were also connected to this mystery card - so the mystery card stood between the drive controller and the disk drives. The mystery card has another ribbon connector that runs to what appears to have been a toggle switch that was on the outside of the machine. The two positions of the toggle switch are "NETWORK" and "LOCAL". The toggle switch is broken off. There is what appears to be a Floppy connector on the external toggle switch module.
There are three standard logic gate chips soldered to the board (74LSxxxx). It appears to me to be a way to connect another kind of floppy drive to the Apple IIe and having a card in Slot 7 may provide a way to control the switching function programmatically.
See the attached pics. Let me know your thoughts. Thanks in advance.