Irregular Screen Flicker

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Article #36564

#36564

From: S.H.Cogheil
Date: Tue, 14 Feb 1989 16:27

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I am currently writing a graphics routine which requires the alternating display
of two screens. At present I am using the set_screen routine to change both the
logical and physical display base.
Doing this on the odd occasion is fine, but when I repeatidly switch between 
screens, I get a FLASH of the previous screen appearing about half-way down the
present screen, and this occurs at none to regular intervals.
It was my understanding that the set_screen command actually waited for the 
vertical interrupt before it switched bases, if this is the case, WHY do I get a
DODGEY display.

{ All replies will be welcomed with open EYES !! }

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|   SAMUEL.H.COGHEIL  |          I-TEQUENOLOGY        '89  |
|---------------------|------------------------------------|
|    Darwin College   |        My Tequenology is           |
|  University of Kent |         High Technology            |
|    shc1@ukc.ac.uk   |           < I-TEQUE >              |
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!sunkisd!uunet!mcvax!ukc!harrier.ukc.ac.uk!gos.ukc.ac.uk!shc1
From: shc1@ukc.ac.uk (S.H.Cogheil)
Newsgroups: comp.sys.atari.st
Subject: Irregular Screen Flicker
Message-ID: <2532@gos.ukc.ac.uk>
Date: 14 Feb 89 16:27:13 GMT
Reply-To: shc1@ukc.ac.uk (S.H.Cogheil)
Organization: Computing Lab, University of Kent at Canterbury, UK.
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