Actually, no, that syntax doesn't work.  I still haven't found a
way to specify the kernel from the boot prom.  However, I can 
enter conversational boot, with 

B/1 DIA0

and after the first boot blocks do their job:

they ask:

Enter image name:

You can type "vmunix" here, and keep going as before.  I could't get 
vmunix -s, or "vmunix -s" to work.

However, the Ctrl-C trick works like a charm.  Thanks to Paul and 
Isildur!

Doug


On Wed, 29 May 2002, Lord Isildur wrote:

> that syntax works on a vax? i thought only DECstations [23]100 used that 
> syntax! 
> isildur
> 
> On Wed, 29 May 2002, Paul Thompson wrote:
> 
> > 
> > You can boot 
> > boot rf(0,0,0)vmunix -s to get into single user mode. (assuming unit ID 0)
> > Supposedly a generous number of CTRL C's during boot will accomplish the 
> > same.
> > 
> > On Tue, 28 May 2002, Douglas Meade wrote:
> > 
> > > 
> > > I just got today a Microvax 3300.  It has 12 Mb RAM, 
> > > 1 RF30 (143 Mb) disk, and Ultrix 4.2 installed.  Is 
> > > there a way to boot this kitty into single user mode
> > > and change the root passwd?
> > > 
> > > Doug