I'm guessing this is extremely easy to do, but for the life of me I can't figure out how to actually start a game once I get to the title screen of an Atari 5200 cartridge rom while using the Caanoo-Atari emulator. I can load the cartridges, see the Atari loading screen, and then see the game cycle through its demo/attract modes, but I can't figure out what button, or combination of buttons to push, to actually get into the game and play.