Hi Gang! It has been my experience that the first OS needed to be installed is OS-9.2.2. Then install OS-X. From there Classic can be called up from within System Ten. However I often prefer to restart my computer into OS-9 rather than use classic, as this works better with some older OS-9 programs. Friends of mine who have installed OS-9 after they had installed OS-X noticed a wide variety of "hinkyness" when they did so. Bill