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vgasync
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vgasync.doc
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1992-04-04
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883b
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NAME
vgasync - Keep VGA sync polarities negative
SYNOPSIS
detach vgasync
DESCRIPTION
'vgasync' runs as a background process under OS/2 and periodically
(re)sets the horizontal and vertical sync polarities of an (S)VGA card to
negative sync.
Many (all?) SVGA cards change the polarities of the H and V sync
signals to indicate to an assumed multisync monitor the current video mode
(and implied scan frequencies). 'vgasync' allows older fixed-frequency
monitors that require a fixed sync polarity to be used with such SVGA
cards without requiring hardware modification of the sync signals. With
the addition of manual sync controls on the monitor and/or a means (eg.
software drivers) of tweaking the VGA CRT control registers, a "fixed
frequency" monitor can then display most of the SVGA extended video modes.
This program requires IOPL to run.