Big Mess O’ Wires (BMOW) announced this morning that they were releasing the Yellowstone controller card to the public. The release makes the cards a Creative Commons license open source project.
Yellowstone is a Liron compatible disk controller for the Apple II. The original Liron cards were created in 1985 but this card uses FPGA to handle all aspects of the cards control features.
You can download the source and design data from the BMOW website at: https://www.bigmessowires.com/2019/01/28/yellowstone-goes-open-source/