Some of you will be aware of the issues that have been experienced with the Coco SDC and OS9. It has often meant mounting the VDK in DOSplus and then BANKing across to another DOS prior to BOOTing the image.
Finally, the root cause of that has been identified, and I have prototype boards which demonstrate this.
This video shows a DragonPlus-endowed machine booting OS9 from a CocoSDC before the fix and after the fix.
I hope to have the adapter boards available for sale soon.
https://youtu.be/gYpFQ0iMR1Q