Sorry for the radio silence on this project, had to deal with moving our arcade out of our previous premises.
I've had a batch of FFB boards made up and they are now available, only about 16 at the moment and the next batch will likely be the summer as I've got a few other projects needing attention.
Available on our arcade store, with Euro / international shipping options:
https://boneyard.sumupstore.com/product/redriver-forcefeedback-for-model-2
I've not put this FFB on github, and it may not be open sourced just yet but my other projects will slowly be creeping onto there, all model 2 hardware based.
Recently released a test rom for model 2 Daytona hardware which you can burn to eproms and it will report if it finds issues with ram, and it can boot without a working IO board attached which can be useful.
Source code and compiler is included on the github:
Test program for Daytona arcade game on Model 2 hardware - stevej0/DaytonaTestRom
github.com
Upcoming next version (February) will have working 3D geometry, texture mapping tests and a debug monitor tool which can download new executables to program memory via a simple USB to serial interface.