EDIT: never mind, found the answer to U104:
"Model III ......... you can start with a 4K Level I system and let it grow with your needs....... Available with either Level I or powerful Model III BASIC."
http://www.trs-80.com/wordpress/trs-...ine/model-iii/
I'd like to know what the differences might be between the Model I and Model III Level I ROMs.
Radio Shack also offered a 4K version with Level I BASIC, identical to Model I Level I BASIC, but with the addition of LPRINT and LLIST commands for printer output
trs80gp -m1 -l1
and trs80gp -m3 -l1