I've got a cabinet with a Sega Dreamcast in it and two hacked gamepads. I would like to use two P360 joysticks. I can get 5v from a switching power supply, but the ground wire needs to come from the Dreamcast, right? How would I hook this up?
BTW, I know I can get 5v from the gamepad, but I am interested in how to wire power from an external power supply.