Re: Vertical Retrace interrupt?

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#503

From: Khan
Date: Tue, 04 Aug 1992 15:17

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In article <1992Aug3.233204.16778@cs.aukuni.ac.nz> cmil2@cs.aukuni.ac.nz (Christopher David   Miller         ) writes:
>Hi, I'm new to VGA programming, and I want to know if it is possible to
>detect the retrace with an interrupt, rather than polling for it.  I want to
>use this so I can flip screens for animation every retrace - I think this is
>how it's done?

EGA and up should be able to do this (I say SHOULD because apparently
some cards don't implement the retrace interrupt properly). I don't have
any source, but everything you need to know is contained in Richard
Wilton's Programmer's Guide to PC and PS/2 Video Systems. The source for
the examples in this book are floating around the net somewhere as
MSCVIDEO.ZIP (sorry, I don't know where exactly).

Hope this helps at least somewhat.

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From: tmkk@uiuc.edu (Khan)
Subject: Re: Vertical Retrace interrupt?
References: <1992Aug3.233204.16778@cs.aukuni.ac.nz> 
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Organization: University of Illinois at Urbana
Date: Tue, 4 Aug 1992 15:17:22 GMT
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