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Mail Archives: djgpp/2000/12/08/02:00:08

Date: Fri, 08 Dec 2000 08:55:46 +0200
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: djgpp AT delorie DOT com
Message-Id: <8011-Fri08Dec2000085545+0200-eliz@is.elta.co.il>
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In-reply-to: <90pkp4$kt9$1@nnrp1.deja.com> (craziestman@my-deja.com)
Subject: Re: DJGPP and protected mode.
References: <90pkp4$kt9$1 AT nnrp1 DOT deja DOT com>
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> From: craziestman AT my-deja DOT com
> Newsgroups: comp.os.msdos.djgpp
> Date: Fri, 08 Dec 2000 03:32:52 GMT
> 
> If I write a program and compile with DJGPP, does my program
> automatically run in protected mode?

It switches to protected mode at startup, and then runs in protected
mode.

> If so, what is the benefit of using DPMI?

You need it to switch into protected mode and to issue real-mode
DOS/BIOS system calls from a protected-mode program.  For more about
this, see:

  http://www.delorie.com/djgpp/doc/eli-m17n99.html#Extending%20DOS

> My understanding was that
> in order to run in protected mode, you needed to use DPMI, but I
> have been finding "documentation" that states otherwise,
> specifically at:
> http://www.rt.e-technik.tu-darmstadt.de/~georg/djgpp/djgpp_asm.html

That page is about inline assembly.  Where do you see it say something
about DPMI?

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