General walkthrough of what it takes to upgrade a MR-1 to a different controller. This one is UCCNC, but others have done linux and acorn so far. Note that this is part one; more headaches ahead.
link to shared documents such as the UCCNC profile and pinouts - https://drive.google.com/drive/folders/1U-p7zBginS4Xzua3PdDdZZhJWKcoD80b?usp=sharing
AlexW's Github - https://github.com/alexphredorg/mr1
