> if you use serial console and standard pc box as terminal, when pc is up,
> everything is OK. But, if your pc box went sleep, connected pmax (in my
> case Decstation 5000/20) starts debugger mode (uncomfortable, when your
> DEC acts as Internet server). The easiest solution is to disconnect pc
> box before shutting it down, or using serial link only to start/stop
> machine and working using telnet/ssh. Any more elegant solutions?

Michael Hitch provided solutions to prevent DECstation from entering
in-kernel debugger mode accidentally.  Observed from your symptom the
PC accidentally emits BREAK condition on serial port upon sleep/wakeup
power management event.  You'd have a similar trouble when the PC used
as any SPARC consoles.  Just curious to know it happens... 

Tohru Nishimura
Nara Institute of Science and Technology