That's do-able, too. Put two sets of ROM sockets on your SCSI adapter with a switch. A SCSI ROM isn't impossible, it's just a lot of work for a problem that's already been solved. Micah's ROMs were written by Steve Brecher, a real Mac Guru, and he spent six months refining and debugging them. I suppose I am missing something, but I don't see the allure of the 64K ROM. The 128K ROMs contain the same code and toolbox as the original with bug fixes, and also support HFS, SCSI, and the rudiments of AppleTalk, among other things, *and* they were written by the genuine Mac team. If you enjoy writing drivers, a SCSI driver for the original Mac is a fine way to spend your summer. I promise you'll learn a lot!
Has anyone else seen a Micah drive? It appears they are much more rare than HyperDrives. IMHO, they were a more elegant solution, since they didn't require a CPU clip, drilling holes in the chassis, pop rivets, etc.