Re: R4600PC upgrade

["William J. Earl" <wje@fir.engr.sgi.com>]

Ulf Carlsson writes:
 > Hi,
 > 
 > I received a R4600PC today (thanks Lukas), and I happily went to my Indy
 > and plugged it in instead of my R4000SC. It failed on the diagnostics test
 > though. 
...
     If your machine is an early R4000SC machine, you may well need a new
PROM to go with the newer processor.  The final PROM, supplied with all
R5000 systems, works with all processors, but a given older PROM generally
does not work with newer processors.  The error message looks like the
result of using an obsolete PROM.