This is ESC by default, and I know in later versions of Mame you can change it to a button combo. On a cocktail, I had it set to exit if you held player1 + player2 start.
Now, with 0.36, I can't seem to find a way to change the exit key in the menus. Is this feature not included in 0.36?
I can probably work around it with the Keywiz, but I'd like to try to obvious solution first.
Wade