Quoting Adam Lebsack (adam@lebsack.com):
> I have a strange piece of 486 hardware here that has two ISA slots, and
> no onboard video.  I have an ISA VGA card in there right now, but I'd
> like to remove it, making a headless machine.  The only problem is that,
> to the best of my knowledge, netbsd now complains that there is no
> console configured, since there's no serial onboard, either.  I gathered
> this from a coredump left by the panic().
> 
> Is there a way to get around this lack of a console?  Shall I write a
> driver that basically uses /dev/null for the console?  

We've done this before.  Life is good until you have problems.
Then you have no way to debug.
Can I suggest stuffing a, hmm, serial card in there?
Won't hurt, will help (nothing like debugging from a coredump
if it comes back up).

There are a number of serial LCD's out there than
might be a good thing for you for fun and use.