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From: gnu@hoptoad.UUCP
Newsgroups: comp.sys.intel
Subject: Re: pointer alignment when int != char *
Message-ID: <2894@hoptoad.uucp>
Date: Sun, 6-Sep-87 21:42:11 EDT
Article-I.D.: hoptoad.2894
Posted: Sun Sep  6 21:42:11 1987
Date-Received: Tue, 8-Sep-87 00:43:08 EDT
References: <493@its63b.ed.ac.uk> <6061@brl-smoke.ARPA> <3812@spool.WISC.EDU> <201@hobbes.UUCP>
Organization: Nebula Consultants in San Francisco
Lines: 17

root@hobbes.UUCP (John Plocher) wrote:
> -- New Subject:  pointer manipulation on intel chips --
> 	A pointer has 2 parts, a SEGMENT and an OFFSET, each 16 bits in length.
>     e.g.:  1040:3333
> 	SEGMENT:OFFSET
>     An address may be converted into a normalized pointer by constructing a
>     SEGMENT:OFFSET pair where the lower 12 bits of the SEGMENT are ZERO.
> 	segment = (unsigned short)(address & 0x000F0000) / 16;
> 	offset  = (unsigned short)(address & 0x0000FFFF);

I think it's great :-) that people are teaching folks how to write programs
for the 8086 that will break when recompiled for the 80386.  There's nothing
like software foolishness to break even the best-implemented hardware
compatability...
-- 
{dasys1,ncoast,well,sun,ihnp4}!hoptoad!gnu	     gnu@postgres.berkeley.edu
My name's in the header where it belongs.