Because why not? There's a RPi shield for everything but buttons! So I decided to make one. Nothing fancy here- no serial encoding, no multiplexing. Just plug-and-play buttons mapped 1-to-1 to the Porta Pi Arcade controls.
Version 1.0 is available in the shop! I am working on am improved version.
For wiring arcade buttons in a more tradition wiring method. Use an old IDE cable to connect to the RPi. Availble in the shop!