Update...
In Win98, it doesn't appear that you can switch primary displays. I can enable the "Extend my desktop onto this monitor", but that doesn't give me an option to make it the primary, and I can't turn that option off for the primary display. If someone DOES know how to do this, even if it's a hack, PLEASE PLEASE let me know...
Now... I can still get
close to having it work, even so. If I extend the desktop onto the V5 display, that allows Myth to detect that a 3Dfx rendering device is available, and I can pick 3Dfx in the video preferences.
If I do that, all of the 2D GUI stuff (game menu and movies) stay on the primary monitor, through the Radeon. Once a mission loads, though, it shows up on the second monitor, from the V5.
However, it's garbled. The picture becomes alternating horizontal lines of real image and "junk". And on the primary monitor, Myth is minimized. Worse, the mouse stays with the primary monitor, so that all mouseclicks are interpreted by the desktop, NOT the game, just like when you minimize a game to the taskbar.
Then I tried Myth II. It works better -- the 3D image is rendered perfectly on the second monitor, no problem -- but I still have the mouse trouble.
So somehow I need to get the mouse strictly attached to what's going on with the second display... and I have no idea how to go about that.
Starting to wonder if I might be screwed on this project.