On Thu, Nov 21, 2002 at 12:28:54AM -0500, vance@neurotica.com wrote:
> On Wed, 20 Nov 2002, Thor Lancelot Simon wrote:
> 
> > > 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.
> 
> Is there any difference in implementation?  Or only clock rate?

The R2000 and R3000 are different implementations of the same instruction
set; the R3000 achieved higher clock rates.  The follow-on to the R3000
was the R6000, which implemented an instruction set much more like that
of modern 32-bit MIPS processors, but which was very expensive, had supply
problems, and ran quite hot -- unsurprising, since it was implemented in 
ECL.

Both the DS2100 and DS3100 use the R2000 CPU.  IIRC, the 2100 runs at
14MHz and the 3100 runs at 16MHz.  The DS5000/200 uses the R3000 CPU,
at 25MHz as I recall.

Thor