To: broehl@sunee.waterloo.edu
Subject: VGA vertical retrace
Cc: glove-list@karazm.math.uh.edu
Message-Id: <9110241117.AA02342@roi.ca41.csd.mot.com>
Date: 24 Oct 91 11:17:39 PDT (Thu)
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