I'm hoping someone can help. Yesterday I loaded the full NES library, a couple SNES, N64 and one Sega ROM. I loaded with 2.14b and retroarch. I have two classic controllers with extension cords. Everything worked except for games that needed the additional controls....
Any idea why I cannot use an extension cord on both controllers at the same time? If I use two extension cords together in series with one controller it does work, which leads me to believe the cord is not bad.
I did uninstall to revert to stock and then reinstalled everything, and the problem remains.
Maybe it is a problem with the flow resistance of your extention cords being just too much for the nes mini. Did you try another power supply?