Re: safe to use IBM VGA monitor in 800x600 mode?

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Article #9167

#9167

From: Doug McDonald
Date: Tue, 23 Jan 1990 21:56

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In article <1990Jan23.211547.3559@mks.com> eric@mks.com (Eric Gisin) writes:
>A recent article mentioned that most IBM VGA monitors
>will work in 800x600 mode. So I tryed it with our colour IBM monitor
>and an Orchid VGA, and it worked except for the loss of a few lines
>at the top and bottom.
>
>But I'm wondering if this is safe to do. Most VGA cards use
>a horizontal frequency higher than the standard 31.5 kHz in this mode.
>Orchid uses 35.5 or 37.24, for example.
>I thought it was not safe to change the horizontal frequency
>on fixed frequency monitors.

My IBM (8513) monitor wouldn't sync at 600x800. But it would in
540x720 mode. This mode on the IBM motherboard VGA I used had the same
horizontal frequency as 480x640, so that is for sure OK. It was used for
months and months so the vertical change appears to be OK also.

Doug McDonald

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uwm.edu!ux1.cso.uiuc.edu!aries!mcdonald
From: mcdonald@aries.scs.uiuc.edu (Doug McDonald)
Newsgroups: comp.sys.ibm.pc
Subject: Re: safe to use IBM VGA monitor in 800x600 mode?
Message-ID: <1990Jan23.215600.24385@ux1.cso.uiuc.edu>
Date: 23 Jan 90 21:56:00 GMT
References: <1990Jan23.211547.3559@mks.com>
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Organization: Univ. of Illinois at Urbana-Champaign, Chemical Sciences
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