From: jerry@jvdsys.nextjk.stuyts.nl (Jerry van Dijk)
Subject: Re: Gnat For use at Question
Date: 1996/07/13
Date: 1996-07-13T00:00:00+00:00 [thread overview]
Message-ID: <DuI8zM.BJ@jvdsys.nextjk.stuyts.nl> (raw)
In-Reply-To: ws94tnd2g8v.fsf@schonberg.cs.nyu.edu
Laurent Guerby (guerby@gnat.com) wrote:
: Spasmo> Hmmmm ok, well here's a question about To_Address. Since PC's
: Spasmo> use segment, base addressing,
: This is a question for a DJGPP master I guess.
Now, I couldn't let that pass, could I ?
The segment:offset adressing is something that belongs to the real-mode
domain. As djgpp (and thus GNAT/DOS) is a protected mode eviroment it
uses the full 32-bit physical addressing. (Physical := 16 * segment + offset).
Instead of a segment, protected mode uses a selector, but a selectors memory
range can be 4 Gb, instead of real-mode's 64K.
--
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-- Jerry van Dijk -- e-mail: jerry@jvdsys.nextjk.stuyts.nl --
-- Banking Consultant -- Member Team-Ada --
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next prev parent reply other threads:[~1996-07-13 0:00 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-07-11 0:00 Gnat For use at Question Spasmo
1996-07-11 0:00 ` Jon S Anthony
1996-07-11 0:00 ` Robert A Duff
1996-07-12 0:00 ` Spasmo
1996-07-12 0:00 ` Robert Dewar
1996-07-12 0:00 ` Laurent Guerby
1996-07-13 0:00 ` Jerry van Dijk [this message]
1996-07-15 0:00 ` Spasmo
1996-07-12 0:00 ` Jon S Anthony
1996-07-15 0:00 ` Jon S Anthony
1996-07-15 0:00 ` Jon S Anthony
1996-07-15 0:00 ` Robert Dewar
1996-07-15 0:00 ` Spasmo
1996-07-15 0:00 ` Jerry van Dijk
1996-07-11 0:00 ` Robert Dewar
1996-07-19 0:00 ` Spasmo
1996-07-11 0:00 ` Jerry van Dijk
1996-07-11 0:00 ` Robert A Duff
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