Windows XP Resolution
It can be done via Display >Settings >Advanced >Device >List All Modes.
This is the ideal Windows resolution for the Polostar.
I don't know yet if there's a possibility for the Polostar to have a modified 800 * 600 resolution without panning.
Meanwhile, I'm stuck with a low-res resolution on a 28 inch screen, which doesn't really matter anyway: it's supposed to be a Mame machine after all.
As for the games, the VGA mode is not taking advantage of the ability to display native arcade resolutions.
Maybe the famous ArcadeVGA will be the solution, but first, I need to know if this card has also a low profile bracket as option.
(The PC can only handle low profile AGP videocards)
There's an excellent Monitor faq here: Ultimarc