If you have a beige (or equivalent PowerBook) running 10.1 or earlier, you can load a(n old, out-of-date, no longer developed) floppy driver that is slow and buggy, but it does work. It happily reads 800K disks, too. (Driver is insanely buggy in 10.2, and won't work at all in 10.3+.)

Note, when I say "slow", I mean "ridiculously, agonizingly, painfully slow". I seem to recall it taking about four minutes to copy a single 100 KB file to a disk.

edit: Added no longer developed disclaimer.