My Apple IIGS has a 3.5-inch drive plugged in to the internal port. Can I
daisy-chain a DuoDisk off the 3.5-inch drive or does the DuoDisk need its
own separate controller in slot 6?
Older Apple IIGS computers (ROM 01), you can connect the DuoDisk directly
to the SmartPort or to a drive attached to the SmartPort.
Newer Apple IIGS computers (ROM 03) need a DuoDisk interface card.