I can't help you with the settings of Magic Engine (and hey, if it's a registered version you should have some kind of documentation or you could ask the authors for help, cos' you've *paid*, right?), but if the 640*480 screen doesn't fill up your monitor it simply means you haven't adjusted your monitor correctly. Just play around with the h/vsize- and h/vpos-settings until you get a picture you can live with. The monitor should remember the settings for that particular videomode, so you only have to do it once.