3.Īs it turns out, the NES hardware itself has a small bug, such that reading sound data from this channel results in the CPU sometimes making an extra 'read' request from one of the controller inputs. This one-bit data stream was used to play extremely basic audio samples in select games, including Super Mario Bros. Further Reading Pokémon plays Twitch: How a robot got IRC running on an unmodified SNESTASBot's newest bit of game-breaking magic relies on the vagaries of the NES' DPCM (differential pulse code modulation) sound channel.
