I have one computer set up with Mame OSX, and if I hit ESC while playing a game, the program quits completely, thus returning to the front end. On my new computer, ESC just quits the running game, and Mame OSX stays open as the front most application. You need to click or tab to the frontend to reactivate that. I don't know what I did on the old computer to have it work like this.
Now I was wondering how I can set up Mame (OSX) to quit on ESC. Is it a Mame thing or a specific Mame OSX thing. Anybody know what to search for?