The way I broke into my VS3100 went something like this:
>> B/R5:1
SYSBOOT> SET/STARTUP OPA0:
SYSBOOT> SET WRITESYSPARAMS 0
SYSBOOT>C
$ SPAWN
$ @SYS$SYSTEM:STARTUP
$ SET DEFAULT SYS$SYSTEM
$ RUN AUTHORIZE
UAF> MODIFY SYSTEM/PASSWORD=YOURPASSWORD
UAF> EXIT
$ @SYS$SYSTEM:SHUTDOWN
When you reboot, you should get the username/password prompt and will be
prompted to change your password after you log in.
I used this to get into my VS3100, before I got the hobbyist license
through DECUS...
Hope this helps,
Aaron
Aaron C. Finney Systems Administrator WFI Incorporated
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"UNIX is an exponential algorithm with a seductively small constant."
--> Scott Draves