Update 2018-02-10: I moved all the old files to a GitHub repo: https://github.com/ccg/irix-video-modes
This page has good information on custom video modes for the SGI O2: http://dart.ncsa.uiuc.edu/slevy/o2-stereo/
The author of that page has a zip file with useful files and information: o2-stereo.tar.gz
I wrote a couple video modes of my own:
- 1400x1050 @ 60 Hz
- 1600x1024 @ 60 Hz
I also have a script to help me remember how to compile new modes: mkvfo.sh