Radio shack, with their Model I, II, III and later TRS-80 color computer, were one of the earliest manufacturers of home computers. As a result, they are also one of the earliest computer game manufacturers. They offered a unique line of games, most of which were never available on other platforms. The majority of the adventure-type games came in plastic baggies with large 9"x12" manuals and cassettes tape containing the game (or occasionally a disk). Perhaps most noteworthy is that those famous games that have been said to have started the genre, Scott Adams' adventure series, began as he started coding them on his TRS-80 (see Adventure International section for details). Also note that the original Radio Shack version of Zork appears on the Infocom page for completeness, even though it is not technically an Infocom game at that point.