That should do it. Either a break via serial or stop+A then boot cdrom at the OK prompt.
Sent from my mobile device. Please pardon any brevity.
On Jul 20, 2013, at 15:19, "Cory Smelosky" <b4 at gewt.net> wrote:
 On Sat, 20 Jul 2013, Beau Walker wrote:
 Hi all.  I was recently gifted this machine but as you can probably
 ascertain from the subject of this email, it has a forgotten password on
 the OS.
 Unfortunately I can't find how to get to single user mode.  I downloaded
 
http://www.sysresccd.org/SystemRescueCd_for_Sparc but it doesn't make any
 attempt to boot to the cd drive.  Is there a startup key/sequence I need to
 hit, or is my only option to pull the drive and slave it to another
 machine. I don't have anything with SCSI setup yet but if that's the route
 I have to take then so be it.
  
 Does dropping to openboot and boot cdrom -s not work? (I'm not familiar with the
SPARCSTATION 20.  Please correct me if I'm wrong)
 --
 Cory Smelosky
 
http://gewt.net Personal stuff
 
http://gimme-sympathy.org Projects