Want to use your SNES controllers with your Famicom? Now you can! The cable label indicates player 1 side.

Only standard controllers and joysticks will work. Accessories like Super Scope, multitap, etc. will not work.

Note: Not all games read input devices connected to the Famicom Expansion port. JeffQChen created a PCB fix here: https://github.com/jeffqchen/Famicom-Expansion-Port-Switcher