der Mouse wrote:
  (2) It's set for output to video and input
from serial.  (This would be
     an unusual way to set it, but I think it's possible.) 
 I could see that happening for a 'hobby' machine snagged from a dumpster
 if all the person had was the CPU unit. It'd be reasonably easy to hook
 some form of graphical display to the machine, but more tricky to
 emulate a missing Sun keyboard.
 It was actually my plan for our Sun 2 machine as we were in exactly that
 situation; we just had the system unit, but no keyboard or display.
 Finding a capable display would be easy enough though, and we had a few
 VT220's laying around with dead LOPTs - I was planning on stripping one
 of those down so it would just run as a nice RS232 keyboard.