After taking part in the very enjoyable RetroChallenge in 2024, I’ve decided to take part again in 2025.
Last year, I worked on a rotary encoder module for the RC2014 computer.
This year, my plan is to interface a classic Nintento Entertainment System joypad to my RC2014.
There is already a module for reading Atari-style joysticks, but I don’t think there is anything for a NES controller.
There are 8 buttons on the NES controller, but the connector has only 7 pins. This means that there is something interesting going on, and it’s not just each button shorting one pin.