From:	b52g AT usa DOT net
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: An OS..
Date:	Thu, 07 May 1998 03:50:03 -0600
Organization:	Deja News - The Leader in Internet Discussion
Lines:	30
Message-ID:	<6irsjt$11h$1@nnrp1.dejanews.com>
References:	<6iqncs$1q3$1 AT alpha DOT sky DOT net>#1/1
NNTP-Posting-Host:	195.11.199.175
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

In article <6iqncs$1q3$1 AT alpha DOT sky DOT net>#1/1,
  "Kevin Hodle" <datastream AT bitsmart DOT com> wrote:
>
> Would it be feesible to write a small OS in DJGPP, considering it's
> extensive DPMI integration?

No, DJGPP's libraries will call down to the underlying OS.
However, you could theoretically bind it with FreeDOS, to use that for the
booting and the calls libc will make.
Then you could make it call a new layer, before command.com, that runs CWSDPMI
(or a variant thereof) to put the system into protected mode and act as the
memory manager.  A memory manager that supports DPMI, not XMS or EMS!
Although you could perhaps emulate XMS or EMS using a DPMI app..

Then you spawn a protected-mode command.com made with DJGPP.

Not entirely an OS, but an interesting idea nonetheless.

Drawbacks..  It might not run realmode programs.
FreeDOS is not yet compatible enough for DJGPP programs.

>
>                                     Please reply via Email if possible.
>                                     Thanks, Kevin
>
>


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