Stereo on a Macintosh

[P3D <Gregg_Podnar@xxxxxxxxxxxxxxxxx>]

I've done a lot of stereo on a Mac with StereoGraphics CrystalEyes-PC
and wireless LCS eyewear.  This is a bit pricey though.  It was designed
for PCs but works just fine on a Mac (VGA cable adapters required).

It works by doubling the vertical sync pulse downstream from the video card.
Any system which does external vertical sync pulse doubling will work on a 
Mac.

StereoGraphics SimulEyes are cheaper ($119) with wired LCS eyewear.  I have 
not tried this on a Mac yet.

Concerning interlace:

Most computer monitors will not to sync to NTSC 60Hz.  Macintoshes have been
capable of outputting NTCS since the Mac II if memory serves.

Officially in NTSC there are timing balance pulses which delay the first line
of a frame so it starts half way across the screen (and the last line of
the second field is a half line as well).  The lines are not strictly 
horizontal, unlike the raster on a computer monitor.

The NTSC RGB standard is called RS-170.  And only a few very specialized
monitors will accept this (clearly advertized as a mode).  

That's NTSC.  Other so-called interlaced formats are for another message.


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