Date: Tue, 8 Feb 2000 09:34:40 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Thorsten Erdmann <thorsten DOT erdmann AT gmx DOT de>
cc: djgpp AT delorie DOT com
Subject: Re: How to create overlays
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On Mon, 7 Feb 2000, Thorsten Erdmann wrote:

> I want to create a set of routines which should be loaded on demand from the
> main program. These routines are a hardwaredriver for several display types.
> I want to define some routines like putpixel, drawstring etc. These routines
> exist for every display type and should be in a file separated from the main
> program, so the user can exchange these driver files without recompiling the
> main program.

Try the DXE feature provided with DJGPP.  See section 22.15 of the
DJGPP FAQ list (v2/faq230b.zip from the usual DJGPP sites) for some
info and pointers.