Re: Vertical Retrace interrupt?

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#418

From: Matthew Smith
Date: Wed, 05 Aug 1992 15:29

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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?  If anyone has some source, I'd really appreciate it
>Cheers,  Chris.
>

That's kind of tricky.  Some video controllers generate an IRQ 2 whenever a 
vertical retrace begins.  However, some don't.  It's a hit and miss situation,
although, I do believe that most adapters made today *do* generate the 
interrupt.  It's those old ones you have to watch out for.

~
Matt Smith
msmith@peruvian.utah.edu
Student - University of Utah Department of Computer Science

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Message-ID: <1992Aug5.092918.5736@hellgate.utah.edu>

Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!destroyer!gumby!wupost!cs.utexas.edu!hellgate.utah.edu!peruvian.utah.edu!msmith

References: <1992Aug3.233204.16778@cs.aukuni.ac.nz>

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Newsgroups: rec.games.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!destroyer!gumby!wupost!cs.utexas.edu!hellgate.utah.edu!peruvian.utah.edu!msmith
From: msmith%peruvian.utah.edu@cs.utah.edu (Matthew Smith)
Subject: Re: Vertical Retrace interrupt?
Date: 5 Aug 92 09:29:18 MDT
Message-ID: <1992Aug5.092918.5736@hellgate.utah.edu>
Keywords: retrace
Organization: University of Utah CS Dept
References: <1992Aug3.233204.16778@cs.aukuni.ac.nz>
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