Re: BOOK: OS/2 Warp Unleashed, 4th Edition cancelled

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Article #4597

#4597

From: Jeffrey C. Dege
Date: Wed, 13 Aug 1997 00:00

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On Tue, 12 Aug 97 08:05:15 -0400, Brandon S. Allbery KF8NH; to reply, change "void" to "kf8nh" <bsa@void.apk.net> wrote:
>
>The 68000 had 32-bit internal address and data, 24-bit external address, and
>IIRC 16-bit external data.  The easiest way to deal with it was as a 16-bit
>processor, although you could treat it as a 32-bit processor if you were
>careful about the upper 8 address bits.  Early 68000 software used it as a
>16-bit processor, later software generally ("pay no attention to that
>TRSDOS-12 behind the curtain" --- nobody else did :-) used it as a 32-bit
>processor.

The 68000 moved data out to the bus 16 bits at a time, but all of the
instructions were 32 bit, all of the addressing was 32 bit, etc.

The 80386 was a 32-bit chip designed to be compatible with preceding
16-bit chips, and was an ugly kludge.  The 68000 was a 16-bit chip
designed to be compatible with a succeeding 32-bit chip, and as
a result, the 68020 was very cleanly designed (and ran 68000 code
with none of the ugly compromises that the 80386 resorted to to
run 8086 code.)

-- 
      IF 2 + 2 .EQ. 5 THEN 5 = 4

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From: jdege@jdege.visi.com (Jeffrey C. Dege)
Subject: Re: BOOK: OS/2 Warp Unleashed, 4th Edition cancelled
Date: 1997/08/13
Message-ID: <slrn5v252s.2o.jdege@jdege.visi.com>
X-Deja-AN: 263829886
References: <5fcrh0$s3p@nnrp1.news.primenet.com>  <33f0551b$1$ofn$mr2ice@speaker.kf8nh.apk.net>
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NNTP-Posting-Date: 12 Aug 1997 20:46:56 CDT
Reply-To: jdege@nospam.visi.com
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