Path: utzoo!utgpu!water!watmath!clyde!rutgers!mcnc!gatech!ufcsv!codas!killer!chasm
From: chasm@killer.UUCP (Charles Marslett)
Newsgroups: comp.sys.ibm.pc
Subject: Re: VGA
Summary: VGA 640x480 uses different Sync-specs than EGA+ 640x480
Message-ID: <2920@killer.UUCP>
Date: 15 Jan 88 05:31:01 GMT
References: <2667@slovax.UUCP> <1249@cg-atla.UUCP> <2181@netsys.UUCP>
Distribution: na
Organization: The Unix(R) Connection, Dallas, Texas
Lines: 30

In article <2181@netsys.UUCP>, tsl@netsys.UUCP (Tom Livingston) writes:
> In article <1249@cg-atla.UUCP> donovan@cg-atla.UUCP (Dennis Donovan X5176) writes:
> >In article <2667@slovax.UUCP> steve@slovax.UUCP (Steve Cook) writes:
> >called Paradise and talked with someone there who informed me that I would
> >need at least the NEC Multisync II because the NEC Multisync doesn't have a
> >screen lock or something and it will roll on you. He also suggested the
> >Mitsubishi DiamondScan.
> >
> 
> 	I currently use the Paradise Autoswitch 480 ( up to 640 x 480,
> 16 colors, but _not_ VGA) and a normal Nec Multi Sync monitor and
> I've never had any problems... isn't 640 x 480 the most stressfull
> (for monitors, of course) mode of the VGA?

Actually, the problem is not either with the resolution or with the number
of colors, but the fact that in 480 line modes the PS/2 monitors expect 2
negative sync signals, in 400 line mode, one positive and the other negative,
and in 350 line modes one negative and the other positive -- some older
multisync monitors don't like these rather arbitrary setups.  Most work
best with a positive H-sync and a negative V-sync (as in EGA-350 line modes).
The Taxan multi frequency monitor is the most versatile in the respect that
I am aware of, by letting you adjust the screen for each of the 4 sync
combinations -- you can make it a PS/2 monitor clone if you want, you can
make it work with older video boards too.  Its a shame I don't like its
colors. . .

Charles Marslett
STB Systems, Inc.
chasm@killer.UUCP
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