From Nesdev wiki
- That depends on photos of the controller sockets on the Famicom four-player adapter. If they're identical to NES controller sockets, or an extension cable would make them that way, I don't see how it wouldn't work. Just make sure at least one of them is actually a (wired) Four Score; two (infrared) NES Satellite accessories would probably just interfere with each other. --Tepples (talk) 14:45, 20 March 2013 (MDT)
- The wired controllers (commons:File:Wikipedia_nes_fourscore.jpg) plug into both ports on the front on the NES or AV Famicom. Player 1 and 2 are permanently attached to the plain famicom. You could cut apart a NES four score and solder on a DA15 connector to get 6 players on a conventional famicom.
- The Famicom expansion port doesn't connect to $4016.0, so there's a bunch of discussion/confusion on the internet about how Hori's four player adapter could possibly work. Nonetheless, games do expect the four player adapter to work as outlined on Standard controller —Lidnariq (talk) 13:55, 21 March 2013 (MDT)