The Model 3 Level I machine is extremely rare. Pictured is the related user manual. (User manual part number is unknown.)
The machine can be identified by it's familiar unibody shape and grey color case. Unlike Level II machines the Level I machine should never contain a floppy disk drive. It can be indentified by it's three error messages: 'WHAT?', 'HOW?' and 'SORRY.'
If you have one of these machines please post a message in the usenet comp.sys.tandy forum. []