The circuit board (top and underside views).
The circuit board attached to the CF Board, USB to ATA/ATAPI bridge and the Microdrive IDE controller.
The USB socket on the rear of the case and the USB bracket.
Power switch circuitry. Since MOSFETS provide switching of current in only one direction, U1 and U2 do the device switching while U3 and U4 are there for reverse current protection.