Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!lll-winken!uunet!microsoft!donh
From: donh@microsoft.UUCP (Don Hacherl)
Newsgroups: comp.arch
Subject: Re: looking for >32-bit address space
Message-ID: <1220@microsoft.UUCP>
Date: 4 Apr 89 02:24:32 GMT
References: <1032@myrias.UUCP>
Reply-To: donh@microsoft.UUCP (Don Hacherl)
Organization: Microsoft Corp., Redmond WA
Lines: 18

In article <1032@myrias.UUCP> cmt@myrias.UUCP (Chris Thomson) writes:
>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.

The Intel 386 supports a 46-bit virtual address space (32 bits of
offset + 16 bits of selector - 2 bits of selector protection),
although the linear and physical address spaces are only 32 bits.  I
know of no OS that supports this, though (does Intel have a 386 iRMX?).
Flat 32-bit address spaces are very popular these days, and no one
wants to buck the trend. 

don
-- 
Don Hacherl		"Sorry, no pithy quotes today"
donh%microsof@beaver.washington.edu or {decvax,uunet,uw-beaver}!microsoft!donh
Disclaimer:  Little of what I say should be taken seriously, and none
	     should be taken as the opinion of my employer.