This repository contains the source for the JVS I/O board I've built using a Teensy4.1 to run inside my Vewlix cabinet, connected to a Naomi. If this setup doesn't seem too bespoke to you and is something you're interested in replicating, setup the IO->button mapping in io.cc to your liking, connect a RS485 transceiver to Serial4, SENSE pin to 41, and you're good to go!
This project uses PlatformIO. Run pio run -t upload to build the project and upload it to the microcontroller.
Currently the IO board presents as the following:
- 2 player 12 buttons (6 ea)
- 2 coin slots
- 8 analog inputs
- 6 digital outputs
When you control the firmware for your I/O board, you can do some fun things:
- Pressing all the player buttons on one side presses the respective Service button to insert a credit
- Digital joystick inputs also update the analog inputs (emulating jerky movements of an analog joystick). The early levels of Monkey Ball are surprisingly playable!
- The I/O board can present to the NAOMI as many in a chain. It takes a good while for the NAOMI to enumerate the max allowed! As-is in the repo it only presents as one board, but this can be adjusted via
jvs_countin main.cc. There is currently no difference in functionality implemented for additional virtual boards, so they all report the same capabilities.