Article View: comp.sys.mac
Article #42794Novice Mac hardware question
From: Pavel Rozalski
Date: Fri, 19 May 1989 17:53
Date: Fri, 19 May 1989 17:53
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1009 bytes
How do I detect the vertical position of the video beam? The problem is
that I am drawing an image to the screen often and noticed that when
it is at the top of the screen there is anoying flicker but lower down
there isn't any at all. This is in monochrome and in color but the
monochrome is better (flickers only very close to the top). I am using
CopyBits. What I had in mind was to wait till the video beam was below
where I wanted to put the image and then start to draw.
Any advice?
Pavel Rozalski
UUCP: ..!uunet!dgp.toronto.edu!pavel
Bitnet: pavel@dgp.utoronto
Internet/Ean: pavel@dgp.toronto.{edu,cdn}
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!dgp.toronto.edu!pavel From: pavel@dgp.toronto.edu (Pavel Rozalski) Newsgroups: comp.sys.mac Subject: Novice Mac hardware question Keywords: Video beam position Message-ID: <8905191753.AA21847@explorer.dgp.toronto.edu> Date: 19 May 89 17:53:19 GMT Organization: University of Toronto, CSRI Lines: 15