Before you start. make sure you go to options in MAME, select "default game options," go to controllers and check the box that says "enable joystick input." Then exit and restart MAME, then start a game up.... Once the game is runnig, pause then hit the "TAB" key, then select "input general," from there just select the buttons you want as your "coin, "start," "button 1, 2, etc"...... Once done the system will save the data input for all the games....... Enjoy......