>> It causes a reset for the machine (drops it back into the PROM). 
>> Ctrl-Alt-BS is the sequence, but remember this is like yanking 
>> out the power cord..
>
> is the PROM different on these such that you can't return to whatever was
> running? the console monitor should be enterable and then returnable to
> the running machine.

As long as my 3.5 year experience of Personal DECstation, Ctrl-Alt-<X
interruption can not be resumed into normal runtime.  It behaves
differently from SPARCstations or larger VAX style Digitals.

Tohru Nishimura