Hello Gui, thanks for your answer. Yes i was thinking about this solution, but this is not what I really want, because a hard reset means that the hole system must reboot again. What I mean is that you just reset the current game you play. So I use the GPIO not for controlling the game. I have 2 wireless USB Controller for that. In retroarch you have the option under settings/control to reset the game, but this function is related to the hotkey function. The problem is in the moment for me that just the first player controller has the Hotkey function enabled. All other controller 2,3,4 player can not use hotkey. If I could change the permission that every controller can use Hotkey the reset will probably work. The purpose is to have the real feeling from the old NES.