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Franklin James (Jim) Butterfield (14 February 1936 – 29 June 2007) was a Toronto-based author and computer programmer famous for his work with Commodore microcomputers, and a longtime contributor to periodicals such as The Transactor and TPUG. One of Jim's major works was the book Learning Machine Code Programming on the Commodore 64 (and other Commodore computers), one of the leading references on programming the 6502-derived 6510 microprocessor.

Jim was born in Ponoka, Alberta, and attended the University of Alberta and the University of British Columbia, but never graduated. In 1957 he moved to Whitehorse, Yukon Territory, to work on the microwave system along the Alaska Highway.

In 1962 he was transferred to Toronto, Ontario. There he was exposed to computers.

In a November 2006 newsgroup message, Butterfield revealed that he was undergoing chemotherapy. His death from cancer was announced on the [news:comp.sys.cbm comp.sys.cbm] newsgroup on 30 June 2007.

This author page uses material from the Wikipedia article "Jim Butterfield", which is released under the Creative Commons Attribution-Share-Alike License 3.0