VGA +ve to -ve Sync

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Article #6880

#6880

From: John Carr
Date: Tue, 15 Sep 1992 20:37

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  I currently have an old 19" computer monitor which has 4
BNC inputs Red, Green, Blue and Sync (Composite that is).
I understand that the horizontal and vertical sync signals
are negative. I would like to build a circuit which allows
me to drive this monitor from a standard VGA card. The 
problem is:   
           1) the VGA sync signals are positive 
           2) the VGA 15 pin connector has seperate horizontal
              and vertical sync signals

I need to invert the sync pulses and superimpose the two
signals (horizontal and vertical sync) into a single 
composite signal. I have no information on the pulse width
and amplitudes of the sync signals. Is there any information
available out there for computer monitor signals? Are there
any IC's which will drive these signals? Any help is much
appreciated.

Regards...
John Carr
carr@bnr.ca

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Message-ID: <1992Sep15.203714.20115@bcrka451.bnr.ca>

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!torn!cunews!nrcnet0!bnrgate!bcrka451!carr
From: carr@bnr.ca (John Carr)
Subject: VGA +ve to -ve Sync
Message-ID: <1992Sep15.203714.20115@bcrka451.bnr.ca>
Originator: carr@bcrks49
Sender: 5E00 Corkstown News Server
Reply-To: carr@bnr.ca (John Carr)
Organization: Bell-Northern Research, Ltd
Date: Tue, 15 Sep 1992 20:37:14 GMT
Lines: 23