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From: bcsaic!chrise@cs.washington.edu (ChrisEsposito)
Newsgroups: sci.virtual-worlds
Subject: Re: Multiple Screens for Stereo Imaging
Message-ID: <1991May28.211920.18374@milton.u.washington.edu>
Date: 28 May 91 20:21:17 GMT
References: <1991May24.161108.16393@milton.u.washington.edu>
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Organization: Boeing Computer Services Advanced Technology Center
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In article <1991May24.161108.16393@milton.u.washington.edu>
fearing@qucis.queensu.ca (Paul Fearing) writes:

>  Does anyone know how to get a Silicon Graphics machine to 
>drive two seperate TV screens at once? Ideally, we'd like to 
>have a different window connected to each screen. 
>This allows us better resolution than using a single screen
>and using mirrors/prisms, etc. to divide it in half.
>Are there any "super" genlock boards that are able to 
>pump out more than one image? 

If you really mean TV screens rather than hi-res color monitors that normally
serve as SGI console displays, then the SGI Video Splitter may do what you
want.  According to the manual (SGI Document #007-5352-010) this board allows
you to split the console screen into up to 4 lower-resolution video outputs
that grab their image from windows on the screen.  The video outputs are frame
synchronous since they share the same video timing and output clock rates.  A
quick scan through the manual reveals that you have a choice as to what the
pixel clock rate will be, output format (VGA, RS170A, 625), whether to genlock
all outputs to the genlock input source, and a few other things.  I haven't
had much of a chance to play with one yet, so I have little real experience to
pass on.  I believe the board is fairly expensive ($15-20K). I don't know of
anything else that can do what it claims to do, but then I'm no video expert.

Chris Esposito




-- 
"Anybody want to trade heads?"  -- Eric Haines, Ray Tracing News, Vol. 4, No. 1
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Chris Esposito                            | Internet: chrise@atc.boeing.com
Boeing Research & Technology, Comp. Sci.  | uucp: ...!uw-june!bcsaic!chrise