Input devices

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The NES and Famicom have a set of I/O ports used for controllers and other peripherals, consisting of the following:

  • One output port, 3 bits wide, accessible by writing the bottom 3 bits of $4016.
  • Two input ports, each 5 bits wide, accessible by reading the bottom 5 bits of $4016 and $4017.

The NES has two general-purpose controller ports on the front of the console, as well as a (rarely used) 48-pin expansion port underneath.

The Famicom's standard controllers are hardwired to the front of the unit, and a special 15-pin expansion port is commonly used for third-party controllers. The AV Famicom, however, features detachable controllers using the same ports as the NES.


Programmer's reference

Hardware

Other I/O devices