CynicalJedi

Thanks, I'm having trouble understanding how you would emulate it via software with the GPIO directly. There are plenty of example of people using a shift register with the RPI but I haven't found anything that looks like emulating one.  I may start with just wiring to register on the controller directly, the only 'gotcha' I see there is that when buttons are pressed it pulls to ground but I think the RPI can handle that. 

Is it possible to wire the GPIO pins from an PRI directly to an NES controller port to attempt to control the game from software? I'm wondering if you'd need a shift register for it to read or if the RPIs GPIO would be enough on its own.