What version of PROM is in the 690?  It could be it takes a different 
firmware version than the 100MHZ version?  Also, what's the MBUS speed set
to?  I believe the 150MHZ chips want 50MHZ MBUS, but the 100MHZ might want
40?
-Brian
On Jan 9,  9:54am, Herb Peyerl wrote:
} Subject: Re: Ross question
} buhrow@lothlorien.nfbcal.org (Brian Buhrow)  wrote:
}  > 	When we've purchased Ross chips for Sparc 10 and 20 machines, the 
}  > seller didn't know which machine we were going to install in.  PROMS were
}  > provided with the chips, and they've worked in both 10 and 20 machines.
}  > The advice is good, change the PROM, test, then change the chip.
} 
} So I have a Ross related question.
} 
} I have a 4/690 in the build-lab that has a Ross 100Mhz chip in
} it, working fine.  (pk used it to do the hypersparc support).
} 
} We recently acquired a 150Mhz Ross (626) in an SS20.  It works fine
} there but putting the cpu in the 4/690 in place of the 100 doesn't
} work.  The mchine doesn't come out of reset and all LED's stay
} on.  What am I missing?
>-- End of excerpt from Herb Peyerl