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From: sorrow@oak.circa.ufl.edu
Newsgroups: comp.os.msdos.programmer
Subject: How do I (or can I) sync to vertical retrace
Message-ID: <0094A875.86885A20@MAPLE.CIRCA.UFL.EDU>
Date: 23 Jun 91 03:58:47 GMT
Sender: news@uflorida.cis.ufl.EDU
Reply-To: sorrow@oak.circa.ufl.edu
Organization: University of Florida CIRCA VAX Cluster
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I am attempting to write a 3d graphics program.  I mean REAL three
d here.  I have a homebrewed set of goggles (X-specs for the Amiga) that
I modified to work with the IBM serial port.  They flip everytime
I set DTR or RTS high and low.  I need to be able to flip them the
same time the monitor swaps...is this possible?  I know the Amiga 
somehow does this (although I think it relies on the interlacing).

During the retrace I also have to swap video pages...is this possible?
In other words, an image on page 0 will have a picture that is slightly
offset from the image on page 1.  Swapping pages at the same time that
the glasses swap shutters would produce a 3d effect...I know this
works since I've done in character mode, where speed isn't as larage
a concern.

Any info in C would be appreciated.

Brian
/*
Brian Hook -- Specialist in X to ANSI.SYS porting software
-----------------------------------------------------------------
"Seamus, that's my dog...I saw her today at the reception...sorry, sixTEEN
inches....better save the women and children first...but this one goes to 11!
..anymore of that plutonium nyborg?....there can be only ONE!....like a 
finger pointing to the moon....ease the seat back...one day closer to death
*/