prodos --> OS X

Nothing modern will read an 800k floppy, much less in ProDOS
format.

I do it by dragging out my old PB Wallstreet (OS9) and putting the
floppy into its Apple-branded floppy drive (which reads/writes 800k
or 1.4m disks). Convert the ProDOS data as needed to a more modern
format, then transfer to the OSX box (ethernet or 1.4m floppy). The
OSX box may have translators for the files.

Hope this helps.
 
I keep an old PowerMac 7100 with Mac OS 8.6 on the hard drive on a shelf in the back of my shop, just for occasions when I need to read an old 800K floppy.

External USB floppy drives will not read 800K floppies (because the 800K capacity on what was really a 720K disk required a drive that would run at variable speeds. None of the external USB floppy drives will do that). If you have something like a beige G3 or a G3 All-in-one that has a built-in floppy disk (which will read the variable-speed floppies) you have to use it in OS 9, because Mac OS X does not support built-in floppies (there are a couple of hacks that were supposed to remedy this, but none of them ever really did much for me).
 
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