Article View: comp.sys.intel
Article #1548Why are segment selectors arranged the way they are?
From: tim
Date: Sat, 22 Nov 1986 00:47
Date: Sat, 22 Nov 1986 00:47
13 lines
1121 bytes
1121 bytes
On a 286, a selector has 13 bits of index, two bits of protection
information, and a bit that tells if it is local or global.
Why is the index in the high order bits instead of the low order
bits? It seems to me that if the index had been put in the low
order bits, then one could simulate a linear address space by making
consecutive segments be 64k, thus getting rid of the biggest objection
most people have to the 286.
--
emordnilapanalpanama
Tim Smith USENET: sdcrdcf!ism780c!tim Compuserve: 72257,3706
Delphi or GEnie: mnementh
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!rutgers!sri-unix!hplabs!sdcrdcf!ism780c!tim From: tim@ism780c.UUCP Newsgroups: comp.sys.intel Subject: Why are segment selectors arranged the way they are? Message-ID: <4664@ism780c.UUCP> Date: Fri, 21-Nov-86 19:47:15 EST Article-I.D.: ism780c.4664 Posted: Fri Nov 21 19:47:15 1986 Date-Received: Sun, 23-Nov-86 04:00:47 EST Reply-To: tim@ism780c.UUCP (Tim Smith) Distribution: net Organization: Interactive Systems Corp., Santa Monica, CA Lines: 13