Re: mapping 36 bit physical addresses into 32 bit virtual

[jw schultz]

On Wed, Oct 16, 2002 at 05:20:15PM +0900, Miles Bader wrote:
> jw schultz <[e-mail]> 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.

-- 
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	J.W. Schultz            Pegasystems Technologies
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