[Alex Busman] has been working with an old microcontroller board called the Handy Board. Recently, he figured out how to interface an NES controller to play music. With 8 buttons on an NES ...
The chip in the middle of the board is a 4021 parallel to serial ... a couple of months ago to build the world’s smallest NES controller.
Its NES Hub connects to that port and adds Bluetooth connectivity, allowing up to four wireless controllers to be connected ...