What's goofy is that the floppy drive in a beige G3 works just fine in most of the varieties of Linux and BSD; and the internal floppy drives work fine on MkLinux machines.
The driver is just a MkLinux driver hacked and ported to Darwin/OS X.

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And if I remember right, both NeXTSTEP and OS X use some variant of BSD buried deep in their core, so if you can make a floppy driver for BSD, it should be no problem to make one for OS X. I would think it should have taken an Apple software engineer all of about 30 seconds to bash one out.