Today I got the PC video displaying on the arcade monitor. Looks like Emudriver and Switchres are working.
Attract Mode with Opacity layout (thanks Frizz!) and GroovyMAME are displaying vertically.
I've got some tuning to do, the monitor will either focus in the middle or the edges, not both. A little reading points to purity adjustment, tube rejuvenation or even a bad tube. The one time I did a PC restart with the monitor on, it seemed to go into shutdown just as the desktop was coming up. I haven't done the card bios yet but I thought the J-Pac was supposed to prevent that.
I'm sure there are several settings I need to tweak in VMMaker and GroovyMAME as well to get the most out of it. I still haven't turned the monitor vertical yet and I don't have any controls hooked up or even a proper panel.
As long as I make a little progress each week, I'll be happy.