> We do have a Sparc-20 at work with the Ross PROM upgrade... does
> anyone know whether a copy of this PROM would work in the Sparc
> 10??? Or do I have to locate a Sparc-10 version? 

I think so. I have exchanged PROMs between SS10s and SS20s and did not
have a problem with it so far. A good test is to first change the PROM
(with the SM41 module still in place), see if that works and then go for
the upgrade. The PROM should allways manage older CPUs.

If nothing else helps I could fix a PROM for you that works for the
Hypersparcs I have. I'll trade that for any N scale model railroad
car by Microtrains or Roundhouse. So now you know that :-)

Harald.