From: mcgratjp@elec.canterbury.ac.nz (J. P. McGrath)
Subject: TECH: Sega LCD Spex problem 
Date: 5 Apr 92 20:30:51 +1200
Message-ID: <1992Apr5.203052.4533@csc.canterbury.ac.nz>
Organization: Electrical Engineering, University of Canterbury, New Zealand


I have just coaxed some Sega LCD glasses into operation with my PC,
doing a little wire-framing. The software runs, generating frames, and
an ISR (called off INT 1c) swaps display pages and controls the
glasses. This results in some synch'ing problems, because the timer
tick is not a multiple of the frame refresh rate, and so some frame
changes occur after a partial frame. Polling the vertical retrace bit
in the display controller is an unsatisfactory overhead. Does anyone
have a code fragment that will allow the use of IRQ2 or IRQ9 or
whatever it is to drive my ISR?

	Any help on this would be much appreciated. Also can someone
point me to any 3d source code (ideally wrt this Power-Glove thingie.)
						Thanks very much,
								Jim McGrath
mcgrath@orpheus.elec.canterbury.ac.nz