Sparcstation 2 OBP password recovery

I guess my Yahoo-fu is just off today.  I would expect that I could easly find 
this from a search engine.

I got a call out of the blue this morning from a friend who had picked up a Sun 
Sparcstation 2.  They were trying to do install the OS, but someone had put a 
password on the OBP.

Hoping that someone has a pointer to a SS 2 OBP passwd recovery page.

Thanks for any comments.

Jerry