"Butterfield, Frank James"@en . "2007Z"^^ . "Frank James \"Jim\" Butterfield (14 February 1936 \u2013 29 June 2007) was a Toronto-based computer programmer, author, and television personality famous for his work with early microcomputers. He is particularly noted for associations with Commodore Business Machines and the Toronto PET Users Group, for many books and articles on machine language programming, and for educational videos and TV programs."@en . . "1936-02-14Z"^^ . . "1936Z"^^ . "2007-06-29Z"^^ . . . . . . . "Canadian computer programmer" . "Jim Butterfield"@en . . . "Butterfield, Jim"@en . .