The best known floppy disk
drive for the
Commodore 64. The 1541 was a single-sided 160 Kb drive but
converting to flippy disks would give another 160 Kb.
The disk drive used Group Code Recording and contained a
6502 processor as a disk controller. Some people wrote
code for it to vibrate the head at different frequencies to
The transfer rate was about 300 bytes per second. The 1541
used a bit-serial version of the IEEE 488 parallel
protocol. Some third-party speed-ups could transfer about 4
kilobytes per second over the interface, and some "fast
loaders" managed up to 10 kbps.
The Commodore 1570 was an upgraded 1541 for use with the