I've got NetBSD 1.1 installed on my IIX (5/160). I am getting an error in 
both boot modes (explained in more detail below):

sd0(ncrscsi0:0:0): Unknown error 80

Things are the same regardless of the presence of my ethernet card. I 
used the APS PowerTools 4.01 formatter to format/partition the disk. I 
got no errors when using the Mac-based mkfs and installer utilities. Any 
ideas? 

Single User Mode:
I can boot into single user mode ok, but after dinking around for a while 
(5-10 min) I get the error. I can run fsck and it says that things are ok.

Multi-user:
Things (as far as I know) go ok in the boot process untill we get into 
the Autmoatic boot process section:
[fsck does its thing]
setting tty flags
starting network
add host myname.my.domain: gateway localhost
sd0(ncrscsi0:0:0): Unknown message 80


-Peter Loron