MAME allows bezels to be overlaid when displaying an emulation. Download this zip file and put it in the artwork directory. When you run the coco3 driver in MAME, there will be a “CM-8″ option in the “Video Options” menu.
Duplicate the zip file and rename the copy “coco3h.zip” to allow the bezel to be available for the coco3h driver as well.
Do you own a monitor that would make a great MAME bezel? I’m looking for original photographs of TVs or monitors that would go well with the other CoCo / Dragon drivers. Contact me and we can discuss the specifics.