Resetting/bypassing P/OS password on DEC Pro 3xx series?

Johnny Billquist bqt at
Mon Sep 28 07:15:59 CDT 2015

On 2015-09-28 05:39, Josh Dersch wrote:
> Anyone recall what the procedure is for resetting or bypassing the
> password on P/OS?
> I *know* I was able to find this out before (in 2008 or so) because I
> did it on another Pro 350 I have, but I cannot for the life of me find
> anyplace that documents the procedure (the FAQ
> ( has no useful suggestions).
> I recall it required booting from a special floppy that had a few
> filesystem tools that'd allow replacing the password file; I'm sure I
> still have the disk image but I have no idea which one it is.  I guess I
> should have saved the instructions somewhere (or maybe I did and I
> simply can't find them!).  I must be getting old.
> I have a new Pro 350 in my possession which has a PC compatibility card;
> I'd like to see if the hard drive contains software for it (or anything
> else interesting) before I wipe it...

You might find some help/inspiration at


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