An often-overlooked feature of the HD20 is the floppy-out connector on the back of the drive. When Apple introduced the HD20 external hard drive in 1985, the situation changed. This would be true whether you used Floppy Emus, or real floppy drives. If you somehow brewed up a custom splitter cable to connect two floppy drives to a single floppy port, it definitely wouldn’t work, and would cause electrical contention that might damage the drives or the Mac. ![]() So you can have one drive on the external floppy port (if the Mac has one), and one drive on the internal floppy port, and that’s all. There’s only a single ENABLE signal at each port, and the Mac ROM only expects to find one drive on each port. With a standard Macintosh floppy drive, there can only be one drive per floppy port. This enabled the use of much larger disk images up to 2 GB, but it also enabled another feature that’s been unexplored until now: daisy chaining! More recently, I added the ability to emulate a hard disk too, for those Mac models that support Apple’s original HD20 hard drive.
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