After 12 months of playing mostly Defender and Robotron, with a bit of Galaxian and Frogger thrown in, yesterday I finally got round to trying my 17" LCD in vertical mode. And WOW, so much nicer for Galaga, Frogger (I'll come to Galaxian later

).
So now I want to finish the job I started, rotatable screen with a front end.
So here are the noob questions:
Can I set it up so that different games call different versions of MAME with different settings ?
Will I need 2 MaLas, one for vertical and one for Horiziontal ? or does MaLa care of the rotating the games, and itself ? (I will manually rotate the screen for now, no servo yet)
Thanks
Oh yes, I said I'd come to Galaxian. I use integer scaling but Galaxian vertical resolution was tripled at some point to 768 and it doesn't work well on my 1280x1024 lcd. I'm going to look back at the earlier versions of Mame to how it plays and looks at 256x224.