If you're actually loading boot.mop then you will see a banner that 
announces its trying to boot regardless of how fast DHCP is. It will 
complain about not being able to load netbsd.gz and then continue with 
"trying DHCP/BOOTP" Its actually quite "chatty."

I still can't figure out if you have the correct console port. Did you set 
switch S3 into the "up" position? Presumably you get the entire power 
sequence up to the chevron prompt ">>>" right?

--Chuck