I found that when I connected a projector, display went all garbled. Found suggestions that this was the 'mirrored display' mode of OS X, which is known to be broken in the graphics drivers on the Wind/Advent 4211.
There was a suggestion to enable the "show display settings in menu bar" or somesuch, which I did, and then hover the mouse button over the icon when plugging a projector in, press down twice, then enter. That disables mirror mode, which seems to be enabled by default when a projector is plugged in.
Did that. It works.
Then had to use DisplayConfigX to remove the 100Hz settings that the monitor didn't like, reboot, mac says it's now at 1024x768 60 Hz, projector says 1280x768 (it is 1280x800 native), everything looks about right in terms of aspect ratio.
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