On Wed, Nov 20, 2002 at 08:28:32PM -0800, Chuck Silvers wrote:
> On Wed, Nov 20, 2002 at 11:08:06PM -0500, vance@neurotica.com wrote:
> > On Wed, 20 Nov 2002, Chuck Silvers wrote:
> > 
> > > > FWIW, I remember my DECstation 3100 always identifying itself as
> > > > having a MIPS R3000 processor during boot, which puzzled me because I
> > > > was always led to believe the 3100 was supposed to have a R2000...
> > >
> > > what I remember from days gone by was that the 3100 had an R3000
> > > and the 2100 had an R2000.  my 3100 also claims to have an R3000 chip.
> > 
> > I believe a 3100 has a R2000 at 16MHz, and a 2100 has an R2000 at 12MHz.
> > I've looked inside my 3100 and it is indeed an R2K.
> 
> 
> ok, you got me curious.  I dug my 3100 out of the pile and opened it up.
> the big chip inside says:
> 
> 
> 	PACEMIPS
> 	PR2000A 16PGC
> 
> 
> so it looks like it's an R2000 after all.  whaddya know...

The R2000 and R3000 instruction sets are the same.

The only difference between the 2100 and 3100 is clock rate.

-- 
 Thor Lancelot Simon	                                      tls@rek.tjls.com
   But as he knew no bad language, he had called him all the names of common
 objects that he could think of, and had screamed: "You lamp!  You towel!  You
 plate!" and so on.              --Sigmund Freud