Re: mapping 36 bit physical addresses into 32 bit virtual

From: Christoph Hellwig (
Date: Wed Oct 16 2002 - 18:21:43 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.

The 64bit mode of the original r4k was so buggy that you couldn't use
it in practice..

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