I wrote the message below regarding my troubles booting with the ethernet card 
installed in my IIvx.  Colin Wood suggested trying it with extensions off.  So I did, 
and unfortunately encountered the same troubles.  Can anyone suggest anything else to 
try?

Thanks for your help.
Paul Phillips
> 
> > I am setting up a new system on a Mac II vx.  Without the ethernet card
> > installed, I can get the system up an running all the way through login
> > as root.  However, with the ethernet card in its Nubus slot, the system
> > hangs about halfway throught the booting process (even before the single
> > user prompt comes up).  The last line I get is:
> >
> > ae0 at nubus 0: address 00 00 94 21 08 16, type MacCon Ethernet 32k mem.
> >
> > Then the system hangs.
> >
> > My setup is as follows:
> > Mac II vx with 12 meg memory.
> > System 7.1 - everything I can think of taken OUT of the system folder.
> > 32 bit addressing on, VM off.
> > Asante MacCon Nubus thick/10 base T ethernet card. Link light is lit.(I
> > even tried two different cards that I know are working with appletalk.)
> > External Hard drive 560 meg with a Mac partition and the Unix partition
> > on it (and a swap partition) set as SCSI 1.
> > The base etc and so forth files are from the March 19 binaries, so I
> > guess they are pretty recent.  I tried both the Booter 1.8 and
> > prerelease of 1.9.
> >
> > Something about this ethernet thing is hanging the boot process, and I
> > am at a loss.  I even tried switching nubus slots - no luck.  If anyone
> > can help, I would be MOST grateful.  I want to get this thing on the
> > net!
> 
> Have you tried completely shutting off all Mac-side networking before
> booting into NetBSD?  That is, unless your machine needs MODE32, try
> booting with extensions off and then boot NetBSD.  In the past, I
> experienced hangs produced by Mac networking software (either EtherTalk
> or MacTCP, but I'm not sure which).
> 
> Later.
> 
> --
> Colin Wood                                      ender@is.rice.edu
> Consultant                                        Rice University
> Information Technology Services                       Houston, TX