Ok, I guess I still need some help, I'm trying to map my IPAC-4 for the Atari 2600 using retroarch with core stella. When I'm in the game, I press F1 and go into Controls and then Port 1. I want to remap the fire key from Key z to Key Lft Ctrl. When i click on it, it doesn't give me an option to change it. It seems like there is a Device type issue that may not be seeing my IPAC-4?