I finished setting up GroovyMAME and the custom drivers on my cool laptop setup about a week ago, and I enjoyed a few days of MAMEing it up. My setup is a notebook with a Radeon HD 7XXX running Windows 7, outputting the video signal via a VGA to 5 BNC connectors, with horizontal and vertical sync tied together with a T-connector. I haven't set up a front-end, so I am simply launching games from the command line.
The first game I tried was Makaimura, then I played some of my favorite CPS games because I planned on going through Daimakaimura soon and wanted to adjust the geometry for that system's interesting resolution. I played a few CPS games and adjusted the geometry, then decided to try Makaimura to see what it would look like to try a game with a different resolution. The moment I hit Enter to launch the game, my PVM's screen became a scrambled mess, and I quickly hit a button on the PVM to switch the input to another channel with no signal on it to protect it from possible damage.
Unfortunately, I guess I wasn't fast enough, because since then, no matter what I hook up, whether via RGB or component or composite, the image is a wavy and stormy mess, presumably because the PVM is failing to read the sync signal correctly.
At least the menus still look fine:
...but when I try any input here, a Sega Saturn over composite the image is a mess:
So, is there something I can check to verify that GM was outputting a valid signal when I launched Makaimura? Could this have been caused by my use of a T-connector to "combine" the syncs rather than a proper solution such as an Extron RGB or UMSA? I will say though that I played DOS games through DOSBox using the same setup for dozens of hours without issue, plus the damage seemed to occur right when I launched Makaimura. I'm also pretty sad that I received an Extron RGB last week, but it had some picture quality issues when I tested it; had it worked fine, I would have already incorporated it into my setup. Finally, does anyone know how to fix my PVM?