Article-I.D.: well.354
Posted: Tue Dec 17 22:29:30 1985
Date-Received: Fri, 20-Dec-85 01:49:43 EST
References: <133@daisy.UUCP> <97800013@ima.UUCP> <464@looking.UUCP> <154@ism780c.UUCP> <351@well.UUCP>
Reply-To: asgard@well.UUCP (J. R. Stoner)
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 32
Keywords: IBM, 8086, 8088, Intel, 80286
Xref: watmath net.micro:13160 net.arch:2322

In article <351@well.UUCP> farren@well.UUCP (Mike Farren) writes:
>In article <154@ism780c.UUCP>, tim@ism780c.UUCP (Tim Smith) writes:
>> It could have been done with no work from the compiler if Intel had
>> put the bits in a reasonable place.  A full pointer has a selector and
>> an offset.  Here is what they look like:
>>
>> ( BONK BONK! :-)
>>
>> 
>
>	Huh?  Wha?  Am I awake yet?   That is NOT the way the segments work;
>the "Other Stuff" is not a pointer into any kind of table, in fact, it doesn't
>exist at all.  A full pointer on the 8086 is two words. The first word is
>nothing more than a pointer to a 16-byte boundary which is the beginning of
>the 64K segment.  The second word is the offset within the segment, and is
>simply added to the (left-shifted 4 bits) first word to obtain a 20-bit real
>address.
>
>-- 
>           Mike Farren
>           uucp: {dual, hplabs}!well!farren
>           Fido: Sci-Fido, Fidonode 125/84, (415)655-0667
>           USnail: 390 Alcatraz Ave., Oakland, CA 94618
>

Not at all.  The information previously posted was in reference to the
user documentation for the iAPX 286 and not the brain damaged 808x 
(the black book).

-- 
From the mania of:
J. R. (May the farce be with you) Stoner, Esq.

Article-I.D.: well.368
Posted: Thu Dec 19 03:58:16 1985
Date-Received: Sat, 21-Dec-85 00:38:27 EST
References: <133@daisy.UUCP> <97800013@ima.UUCP> <464@looking.UUCP> <354@well.UUCP>
Organization: Whole Earth Lectronic Link, Sausalito, CA
Lines: 20
Keywords: IBM, 8086, 8088, Intel, 80286
Xref: watmath net.micro:13181 net.arch:2330
Summary: Open mouth, insert foot...

In article <351@well.UUCP> I wrote:
>In article <154@ism780c.UUCP>, tim@ism780c.UUCP (Tim Smith) writes:
>> It could have been done with no work from the compiler if Intel had
>> put the bits in a reasonable place.  A full pointer has a selector and
>> an offset.  Here is what they look like:
>>
>
>	Huh?  Wha?  Am I awake yet?

	Well, the answer is, of course, no.  If I had been paying more
attention (or had bothered to look at the previous articles), I would
have realized that the subject wasn't 8086 segments, but 80286 protected
mode, as many have been kind enough to point out. My apologies to all - 
I'll try and see that it doesn't happen again.
 
-- 
           Mike Farren
           uucp: {dual, hplabs}!well!farren
           Fido: Sci-Fido, Fidonode 125/84, (415)655-0667
           USnail: 390 Alcatraz Ave., Oakland, CA 94618