James Graham <greywolf@captech.com>  wrote:
 > Hit break on your serial console, however you do so.  It will NOT be a
 > control-C; it will be a genuine hardware break.  You should get an "ok "
 > prompt (if you get a ">" prompt, type "n" first).
 > 
 > Type:
 > 	banner
 > 
 > and all information (ethernet address, host ID, serial number,
 > prom revision, and workstation type) will be displayed.


....and then type "go" again if you want to allow the operating system to
continue running after you've done so... If you were in 'X', then run 
'xrefresh' to refresh your display (after hitting L1-A to get into the prom).

anyway, probably obvious but it might help someone.