I'll second that too...
The COCO - fond memories, OS9 rocked! At one point had 31 terminals connected to mine over phone lines. Wrote a machine control program for a fellow in Texas and last I heard he was still running his production line with it. He bought a 100 of them when they closed it out. This was the machine I learned to program on. Unfortunately my last surviving model, a CoCo3 was lost in a fire. OS9 with its multi-tasking, multi-threading model was great, and to think we actually created programs that worked in 4K of Ram. Brings back fond memories to me.