Using an internal Superdrive or 800K macintosh floppy on IIgs

--- On Tue, 6/25/13, Alexandre Souza <alexandre.tabajara at gmail.com> wrote: Yes. You can. You can use any of the auto inject drives from a Macintosh, connected to that 19 pin port on the back. The 800k mechanism in the external 3.5" drive is exactly the same as the one in a Mac. And you can swap the mechanism in an external drive with a Superdrive and it will work with the IIgs as 800K, it just won't work as a Superdrive unless you have the (very rare) Superdrive controller for the IIgs. The eject button on the external drive is connected to the little board in the external drive enclosure with the daisy chain connector on it. I don't remember the specifics of that board off the top of my head, unfortunately. I forget exactly how drive select is done on the 3.5 drives, but I know on the Unidisk 5.25, there are two pins for drive select. 9 and 17, IIRC. 17 selects the first drive, 9 selects the second, and 9 on the first drive is routed to 17 on the daisy chain connector for the second. I think there's an additional pin for 3.5 enable. Hence why you have to have the 3.5" drives first in the chain, before the 5.25's. -Ian