Message-Id:	<199602241847.NAA12097@delorie.com>
Date:	Sat, 24 Feb 96 13:37:05 EST
From:	"William Parsons Newhall, Jr." <NEWHALL AT american DOT edu>
Organization:	The American University
Subject:	Vertical Retrace Interrupt Questions
To:	DJGPP Mailing List <djgpp AT delorie DOT com>

I want to modify my SVGA graphics library(which uses a double buffer) so
that it automatically copies data from the virtual screen to the frame
buffer during the vertical retrace.  As it is now, I have to directly call
the screen copy procedure from within my code, and I'm curious to see if
having it happen automatically would increase performance.

I was wondering if anyone has done this before using DJGPP 2.0.  I have
documentation specifying how to do it using Borland C in real mode, but
I can see a number of places where protected mode issues might crop up...

Thanks for your attention...

William Newhall

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