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From: c60c-1gd@e260-3c.berkeley.edu (Joon Song)
Newsgroups: comp.os.msdos.misc,comp.sys.ibm.pc.misc,comp.windows.ms
Subject: Re: NEC 3D OK in interlaced 1024 x 768 ??
Keywords: NEC 3D  choice of VGA card
Message-ID: <1990Sep29.200049.22028@agate.berkeley.edu>
Date: 29 Sep 90 20:00:49 GMT
References: <1618@mitisft.Convergent.COM> <1990Sep28.235629.15785@rick.cs.ubc.ca>
Sender: usenet@agate.berkeley.edu (USENET Administrator)
Organization: University of California, Berkeley
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In article <1990Sep28.235629.15785@rick.cs.ubc.ca> e4666881@rick.cs.ubc.ca (richard louie) writes:
>
>     The NEC 3D should not be ran too long in 1024 x 768 mode
>because of the feature referred to as interlaced.  When a display
>is interlaced, you will tend to see a flicker on the screen.  This
>flicker is caused by the monitor needing to refresh the display
>to get the 1024 x 768 more often than when a lower resolution 
>is displayed on the screen.  This means that most people will be
>able to see these additional refreshes - bad news.

This is incorrect.  Interlaced displays are not refreshed more often than
non-interlaced displays.  In fact the opposite is closer to the truth.  When
a display is interlaced, only every other line on the screen is refreshed
during each vertical pass.  So it takes two vertical passes to refresh the
entire display.  The reason the display flickers is that the display is
being refresh at only one-half the rate of a non-interlaced display.

-Joon Song
 c60c-1gd@web.berkeley.edu