I think it's because both technologies are actually serial devices. One important hint to pass on: If you completely remove the Bourns network filter (or equivalent) off of the logic board, it disables the external floppy port and the internal still works. The same goes with the network filter for the SCSI side.

If you need more schematics for the whole blasted thing, let me know.

73s de Phreakout. :rambo: