On Sun, 22 Jul 2018, Charles Dickman via cctalk wrote: If you use the Radio Shack distribution of OS-9, then just booting with the RS OS-9 boot disk. I never took it much past that. I played with it a little to learn a little about it, but didn't have any active need or use for it. Make spare copies of the disks, and write protect them. If unfamiliar with the commands of an OS, it's quite possible to accidentally issue destructive commands. I remember somebody (NOT ME) accidentally formatting an Apple II disk when they first came out, while trying to guess the commands. It is certainly your choice, and it sounds like a good idea. However, if it were I, I would separate the hardware project from the software project, rather than doing both at once. Being cowardly, I would set up a stock disk system, and play with OS-9. Separately, I would try implementing solid-state memory. THEN I would try to combine the two modifications. There are still some Coco and OS-9 people around, although hardly as many as there once were. I'm in touch with Doctor Marty, but he's no longer doing Coco. His current project(s) are retrospective scanning/digitization of communist newspapers from the 1920s through 1940s. -- Grumpy Ol' Fred cisin at xenosoft.com