if you use a tv, and like he already said, dont charge anyone to play it, it's all legal. you could make it seem a little more authentic by making a control panel with real buttons and wiring them up to the input from the original joystick controller to make it look as authetic as possible. but it might take some work, and maybe even two of those, since you might mess up. good luck, and ask any more questions if you have em.