Re: mapping 36 bit physical addresses into 32 bit virtual

From: jw schultz (
Date: Wed Oct 16 2002 - 05:04:39 EST

On Wed, Oct 16, 2002 at 05:20:15PM +0900, Miles Bader wrote:
> jw schultz <> writes:
> > i distinctly remember the working with the newest R400x in 1993 which
> > was still 32bit. I know MIPS went to 64bit sometime not too long
> > after that (mid 90's?) but by then Alpha and Sparc had beaten them to
> > the punch.
> You're wrong -- the R4000 was absolutely 64-bit, and was released in
> 1991. The 64-bit sparc was circa '93, and alpha I dunno, but I think
> '91-'92.
> [note that I'm talking about chips, not software; I believe it was quite
> a while before the OS stuff caught up with the 64-bit mips processors]

OK. I guess i'm wrong. It may be that the hardware was
locked into 32bit mode. The development period was a couple
of years so we were running on essentially 89-90 tech with a
faster clock.

	J.W. Schultz            Pegasystems Technologies
	email address:

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