Re: Vertical Retrace interrupt?

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#402

From: sl8nl
Date: Tue, 04 Aug 1992 03:05

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> 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

Question:  If you set the retrace up as an interrupt (possible...by modifying
the timer interrupt to run at 60 times a second), wouldn't you still have
to poll for it.  For instance, the polling code sets a flag to true for the
retrace.  Wouldn't you still have to poll for this flag the same way to
poll for the retrace?

Josh

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Message-ID: <1992Aug3.210504.57823@cc.usu.edu>

Path: arc1-ca.pugleaf.net!sparky!uunet!caen!hellgate.utah.edu!cc.usu.edu!sl8nl

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

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Path: arc1-ca.pugleaf.net!sparky!uunet!caen!hellgate.utah.edu!cc.usu.edu!sl8nl
From: sl8nl@cc.usu.edu
Newsgroups: rec.games.programmer
Subject: Re: Vertical Retrace interrupt?
Message-ID: <1992Aug3.210504.57823@cc.usu.edu>
Date: 3 Aug 92 21:05:04 MDT
References: <1992Aug3.233204.16778@cs.aukuni.ac.nz>
Organization: Utah State University
Lines: 11

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