I believe you can use eeprom -i -c to ignore the bad checksum and then
to calculate a new one.  This bad checksum is probably the result of you
extracting the battery earlier.  I don't know if you can see the old
password, but if you turn off the password mode, it will ignore the
password.
-Brian

On Nov 5,  3:05pm, Rick Copeland wrote:
} Subject: PROM Pass: x0K%*~sappho#
} 
} I went back to the guy that sold me the 4/110 and looked around his store,
} we finally found the Tape drive / disk drive box that came with the 4/110.
} When I connected it to the 4/110 and booted it up it started loading SunOs
} 4.1.1 and managed to get near finishing then said reboot failed with the
} following warning:
} 
} WARNING: file systems have NOT been remounted read-write. Use fsck to fix
} any file system problems, rebooting the system if any problems are found
} with a mounted file system. After file systems have fsck'ed cleanly, you
} can remount file systems and finish single-user setup using "/etc/rc.single"
} #
} -:/usr/spool/mqueue:bad directory
} -:cdmq: not found
} #
} 
} At this point I seem to be in user mode or at least somewhere near, I then
} typed:
} 
} # cd /dev
} # cat eeprom
} ----sd x0K%*~sappho#
} 
} Then I figured I would try:
} 
} # eeprom
} # eeprom: diagnostic area checksum wrong
} 
} Looking at the above is there a password in "----sd x0K%*~sappho#" or would
} the command eeprom have cleared it if it had not had the error?
} 
} Rick Copeland
} 
>-- End of excerpt from Rick Copeland