[comp.sys.att] undocumented option in AT&T System

rjd@tiger.UUCP (08/11/87)

> >> Yep! works with version 3.0 too.  Looks like we should all make sure
> >> to change that firmware password from the default!  
> >
> >The 3B2 firmware password may be reset by unplugging the "non-volatile
> >RAM" battery for a moment while the primary power is off.
> 
> 	Yea?  I did this and now I get:
> 
> 	FW ERROR 1-02: DISK SANITY FAILURE
> 
> 	I say don't try it!!!!!
> 

   The act of unplugging the battery for about thirty seconds or more
while the machine is off will indeed erase all of your NVRAM (Non-Volatile
RAM) storage, which contains the firmware password.  On the first subsequent
application of power to the system, it will report an NVRAM SANITY FAILURE
and say "Default values assumed", which means that "mcp" is your firmware
password again.
   If you are careful in getting to the connector, since you cannot easily
unplug it without unbolting the apparatus housing, there will be no problem.
If you are not careful, you can possible zap the system board with static
or disturb any of the disk cables.  The DISK SANITY FAILURE message may be
caused by you disturbing one or more of the cables to the hard disk(s) or
something more serious, such as a static damaged system board.  Try
reseating all of the hard disk cables but BE CAREFUL and be grounded while
doing so.

Randy