0> boot fd:0 can't LOAD from this device
How did you write the boot floppy ?
You need suntar on MacOS to write. There are other ways to 
do that, but in your case suntar seems to be the best fit.
When you write by suntar, write the file several times
( write the same thing several times. suntar is weak to
write-confirm).

Ryan> I tried booting from CD.
Also in this case, how to write is important. There is
a instruction to use Toast in INSTALL document (By Michael Wolfson).

Ryan> I tried booting from an external ZIP disk.

Ryan> This one is better but still not there.
0> boot scsi/sd@5:0, <anything here doesn't seem to matter> unrecognized
Ryan> Client Program formatstate not valid

In this case, you need installboot utility to make ZIP to boot, unless
you write boot.fs on that.
u---
Makoto  Fujiwara
http://www.ki.nu/software/NetBSD/iBook2/