There's an EASY way to get things to work for guys with a G400. You can plug the arcade monitor in output #2 of the video card, set TV-OUT to ON, CLONE mode, and click on advanced and select type:SCART-RGB. I know the windows says only for europe but it works fine with NTSC. This gives you a 15Khz RGB output of Windows up to 1024 X 768. You then just run the windows version of MAME. The pinout of the #2 output to get this to work is:
1 - RED
2 - GREEN
3 - BLUE
4 - Composite sync
5 - Ground.
12 - connect to pin 15 - This lets the G400 know that there is a TV-OUT cable attached
I wish I could have known this 2 years ago... I used to run the system in DOS with ARCADEOS. Now I run Windows, MAME AND Daphne on my arcade monitor.. WOOHOO!!! Cliff hanger brings back a lot of memories!
BTW all the above info was found in the Matrox Tech support forums.. There's a wealth of info there...
Mike