You can add wireless controller support to the NES through its unused expansion port
RetroTime has found a good use for the expansion port Nintendo included on the underside of the NES but never utilized. Its NES Hub connects to that port and adds Bluetooth connectivity, allowing up ...
Hackaday5y
Use Your Game Boy As A Wireless Controller
Set out to make it happen, the final product is a game cartridge that makes the classic handheld a wireless ... with a weirder controller than all your friends. A Super Nintendo version is also ...
Hackaday6y
Bring Your Own Controller Kits Just Add Bluetooth
Known for their build quality and low latency, the [8bitdo] line of Bluetooth controllers are generally well liked among classic videogame ... the original NES controller, SNES controller, and ...