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Date: Thu, 24 Oct 91 15:28:40 -0400
From: Dave Stampe-Psy+Eng <dstamp@watserv1.uwaterloo.ca>
Message-Id: <9110241928.AA10942@watserv1.uwaterloo.ca>
To: broehl@sunee.uwaterloo.ca, lance@roi.ca41.csd.mot.com
Subject: Re:  VGA vertical retrace
Cc: glove-list@karazm.math.uh.edu
> From glove-list-request@karazm.math.UH.EDU Thu Oct 24 14:57:02 1991
> To: broehl@sunee
> Subject: VGA vertical retrace
> Cc: glove-list@karazm.math.uh.edu
> From: Lance Norskog <lance@roi.ca41.csd.mot.com>
> 
> 
> The answer is to get one of the many VGA cards which do support
> vertical retrace interrupts.
> 
> Alan Killian discussed his work with LCD goggles awhile back
> on sci.virtual-worlds, and we realized that the LCD timing
> is such that it may be preferable to switch the goggles
> ahead of the vertical retrace rather than on it.  Also,
> we might want to separately control the two cells rather
> than just have a left-right control line.
> 
> This would need an outboard box which read the horizontal
> and vertical sync, counted up retraces, and switched the
> LCD cells just before rather than "on the beat".
> 
> This sounds like another job for the outboard glove control board.
> It could do the serial port AA and control line trick to control
> the LCD cells.
> 
> Lance Norskog
> 

I've had no problems using Sega glasses with monitor VSYNC...  if
they're driven properly.  Some of the older models might have had
slower pi-cells.. I dunno.

- Dave Stampe