At Fri, 29 Dec 2000 17:34:56 -0500 (EST),
> "boot fd:0" pauses, spins a twirler for a moment (perhaps four twirler
> updates), and reports "FD: can't LOAD from this device".  I've tried

This seems to me the way of writing to the floppy is the problem.
(1) use dd if you have another Unix machine with fd drive available,
or 
(2) use suntar on MacOS and duplicate with Diskcopy to avoid read error,

http://www.ki.nu/software/NetBSD/macppc/starting-e.shtml#MAKING_FLOPPY
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(Makoto Fujiwara)