I can look into putting the printer port and other drives back in. Double sided will never work without hardware modifications, as there is no IO pin hooked up to the side select pin....
For the other drives, how would that work? Does it just respond on selected drive +? So if DIP switch is drive 1, it responds on 1,2,3,4, and if the switch is at 3 it does 3,4,5,6?