sra@idx.com (05/14/91)
In layman's terms how does a VGA board and Autosync Monitor figure out how to
talk to one another? I have a board/monitor combination that (2 times out of 3)
can't get in "sync" and the monitor "snaps" off (or gives up).
tnx, steve
/------------------------------------------------------------------------\
> Steve Alpert (W1GGN) IDX Corporation Marlborough, Massachusetts <
\--------------------------- sra @ idx.com ------------------------------/steveq@syd.dms.CSIRO.AU (Stephen Quigg) (05/15/91)
In article <1991May13.134149.2267@idx.com> sra@idx.com writes: >In layman's terms how does a VGA board and Autosync Monitor figure out how to >talk to one another? I have a board/monitor combination that (2 times out of 3) >can't get in "sync" and the monitor "snaps" off (or gives up). > >tnx, steve > > /------------------------------------------------------------------------\ > > Steve Alpert (W1GGN) IDX Corporation Marlborough, Massachusetts < > \--------------------------- sra @ idx.com ------------------------------/ The VGA board tells the monitor what to expect by the polarity of the horiz. and vert. sync signals. Here's what an NEC MultiSync 2A sets up to. Vert Res. Horiz Freq H Sync Vert Freq V Sync Polarity Polarity 350 lines 31.5 kHz pos 70.07 Hz neg 400 lines 31.5 kHz neg 70.07 Hz pos 480 lines 31.5 kHz neg 59.95 Hz neg 600 lines 35.2 kHz pos 56.24 Hz pos Your problem is probably one of the following; 1. You are trying a mode your monitor won't support. 2. Your monitor is out of adjustment. 3. Your monitor is faulty. Possibly, the card or monitor is not "playing the rules", eg monitor expects one set of sync rates according to the sync polarities, and the card is sending out another (unlikely but...)