See also: OpenFlops is an Open Hardware Floppy Disk Drive emulator/simulator. https://github.com/SukkoPera/OpenFlops

HN discussion on various open hardware floppy controllers. https://news.ycombinator.com/item?id=22970693

Greaseweazle - Tools and USB interface for accessing a floppy drive at the raw flux level. https://github.com/keirf/Greaseweazle https://www.retrocomputers.online/greaseweazle-flux-level-fl...

FC5025 USB 5.25" Floppy Controller http://www.deviceside.com/fc5025.html