Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!tank!uxc!uxc.cso.uiuc.edu!mcdurb!aglew
From: aglew@mcdurb.Urbana.Gould.COM
Newsgroups: comp.arch
Subject: Re: looking for >32-bit address space
Message-ID: <28200297@mcdurb>
Date: 6 Apr 89 21:10:00 GMT
References: <1032@myrias.UUCP>
Lines: 18
Nf-ID: #R:myrias.UUCP:1032:mcdurb:28200297:000:876
Nf-From: mcdurb.Urbana.Gould.COM!aglew    Apr  6 16:10:00 1989


>>Are there any micros or chipsets out there that support an address space
>>larger than 32 bits?  The current trend in micros seems to be toward 64-bit
>>data paths but only 32-bit address paths.  In a large-scale parallel
>>processor, this starts to feel a bit like a PDP-11.
>
>It was gonna come around sooner or later.  HP saw this coming five years ago
>when we developed our HP-PA (Precision arcitecture "RISC").  This gives you:
>
>32 bit virtual and 32 bit physical addressing : Level 0 compliance.
>48 bit virtual and 32 bit physical addressing : Level 1 compliance.
>64 bit virtual and 32 bit physical addressing : Level 2 compliance.

Ummh, correct me please, but I thought that HP's machine provided
segments, with 32 bits of maximum segment size, and the extra bits
basically accessible by segment base registers.

(I thought of the HP3000 when I read about it).