sd1diskutil: Resurrecting a disk format from the dead for a brand-new emulator

A little history The Ensoniq SD-1 is a synthesizer from the 1990s — a ROMpler with a Motorola 68000 at its heart. Like many synthesizers of the era, it uses the cheap, easy, and simple storage medium of the day: 800K floppy disks for storage of everything: factory programs, user programs, presets (organized small sets [ ]