Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!execu!sequoia!uudell!twaddle.dell.com!jporter
From: jporter@twaddle.dell.com (Jeff Porter)
Newsgroups: comp.windows.ms
Subject: Re: Flicker. . .in 1024x768x256 w/Nec 3D
Message-ID: <15085@uudell.dell.com>
Date: 12 Feb 91 15:19:45 GMT
References: <91042.221913MXP122@psuvm.psu.edu>
Sender: news@uudell.dell.com
Reply-To: jporter@twaddle.dell.com (Jeff Porter)
Organization: Dell Computer Corp.
Lines: 29

In article <91042.221913MXP122@psuvm.psu.edu>, MXP122@psuvm.psu.edu (Malzor) writes:
|> OK, I remember some talk a while back about flicker in this mode with a Nec
|> Multisync 3D and I COMPLETELY ignored it because my windows worked great in
|> this mode.  Well, I just updated my system with memory and can now run in
|> 386 enhanced mode.  Now there is flicker on my Nec.  How do I get rid of this?
|>       It is OK if I then run it in real or standard mode. . .
|> 
|>       any advice???
|> 
|> 
|> Thanks.

The flicker is a function of the refresh rate of the display which is in
turn controlled by your graphics card.  To get 1024x768 resolution, your
graphic cards (as do most VGA/ super VGA) use interlaced mode.  In interlaced
mode, the graphics card updates the even scan lines and odd scan lines during
alternating frames.  The net effect is that the even scan lines are updated
30 times a second and the odd lines are updated 30 times a second.  At this
low speed, some flicker is noticable, especially with high contrast images.

To correct the problem, you will have to update your graphics card (ouch)
*and* your monitor (OUCH!!).  The Nec 3D is a great monitor (I have one
at home!), but it isn't fast enough to support non-interlaced 1024x768.

(In non-interlaced mode, the whole screen image is updated every 1/60th of
a second.  The scan lines are updated sequentially from top to bottom.)

Jeff Porter
Dell Computer Corp.