> I am building a custom cabinet. I'm thinking of buying a 16:9 monitor, rotating it 90
> degrees clockwise, and covering up the bottom so that what is viewable to the player
> looks like a 4:3 monitor.
> In order for this to work, I'd need to have MAME rotate its game display—I know it
> can do that—but also, draw the upper left corner of the game display in the lower
> left corner of the monitor. In other words: both rotate and reposition MAME's game
> Is this possible in any MAME builds out there?
NEC manufacturers excellent 4:3 LCDs. We used them at my old job. Otherwise I think you might be able to accomplish this with layout files.