Well it's for my buddy who has a 4-sided cocktail cabinet, he would like to fire up a game then press a button to rotate the screen without having to leave the game.
So yeah, that would be cool, when it's player 2's turn press the button until it is facing him.
Thank you,
Craig
I don't know anything about Advance MAME.
If you just want the game to be vertical for vertical games, horizontal for horizontal, just set -rol=1 or -ror=1 in mame.ini (or maybe it's -autorol, etc, something like that).
If you want cocktail game to flip for player 2, just go into the dip-switches and enable cocktail mode (assuming it has one and assuming it will flip (it's broken on a lot of games).
If it's not a cocktail games, most of the newer Nvidia or ATI drivers have hotkeys to rotate the screen, but you would have to set them so they could be activated from the CP, but wouldn't conflict with MAME.
Even then I don't know if MAME would pass the info to the graphics driver when it was active, so you might have to pause MAME, Alt-Tab to the desktop or front-end, rotate the screen, and Alt-Tab back to MAME.
BTW, any game that is 2P alternating and does not have a cocktail mode, will require you to map the P1 and P2 Controls to Player 1, so either player will be able to mess up the other player's turn.
HTH.