This might be old news to Nekochanners who have a lot of vintage Mac hardware, as it has been around for a couple of years, but I don't recall seeing it mentioned before, and it seems pretty neat, at least to me:
"Floppy Emu is a prototype floppy disk drive emulator for vintage Macs. It uses an SD memory card and custom hardware to mimic a 400K, 800K, or 1.4MB 3.5 inch disk drive and floppy disk. It plugs into the Mac’s external or internal floppy connector, and behaves exactly like a real disk drive, requiring no special software on the Mac."
Anyway, in case it helps anyone - http://www.bigmessowires.com/macintosh-floppy-emu/
"Floppy Emu is a prototype floppy disk drive emulator for vintage Macs. It uses an SD memory card and custom hardware to mimic a 400K, 800K, or 1.4MB 3.5 inch disk drive and floppy disk. It plugs into the Mac’s external or internal floppy connector, and behaves exactly like a real disk drive, requiring no special software on the Mac."
Anyway, in case it helps anyone - http://www.bigmessowires.com/macintosh-floppy-emu/