Sorry @cheshirenoir,
I posted the link to my original version of the controller, it's a private repository. I've updated the link in my first comment.

https://github.com/evg2000/ATTiny84_Version3.1

Hi, I'm Charles, I go by evg2000 on the forums. I picked up a CV a few years ago, did a simple video mod so I could use it on a composite monitor. Unfortunately the joysticks don't work well. I hope to work on a couple of hardware projects for the CV later this year, so I'm hoping to get some info f...