Jim Butterfield

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For the American football player, see Jim Butterfield (American football).
Jim Butterfield
Born (1936-02-14)February 14, 1936
Ponoka, Alberta, Canada
Died June 29, 2007(2007-06-29) (aged 71)
Toronto, Ontario, Canada
Occupation Computer programmer, author
Spouse(s) Vicki Butterfield
Children Susannah Butterfield, born in 1988.

Frank James "Jim" Butterfield (February 14, 1936 – June 29, 2007) was a Toronto-based author and computer programmer famous for his work with Commodore microcomputers.

A longtime contributor to periodicals such as The Transactor and TPUG, one of Butterfield's major works was Learning Machine Code Programming on the Commodore 64 (and other Commodore computers),[1] one of the leading references on programming the 6502-derived 6510 microprocessor. Butterfield was also the author of Supermon and Supermon 64, two machine language monitors that many Commodore assembly language programmers used to debug and test code.

Butterfield 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 to work on the microwave system along the Alaska Highway.

In 1964, while working for CNCP Telecommunications, Butterfield first programmed a computer. A decade later he returned to computing by purchasing a KIM-1, hosted the first Toronto PET User's Group meeting in his home, and began writing on computer topics. After quitting his job with CNCP because he did not wish to relocate from Toronto, and with previous experience writing radio commercials, Butterfield in 1981 became a freelance writer, lecturer, and consultant.[2] He became so well known to Commodore users that an issue of The Transactor included a satirical centerfold of a (clothed) Butterfield.[3]

In 1983, Butterfield appeared as the resident expert in the TVOntario educational television program, The Academy, which served as a companion series to Bits and Bytes.

In a November 2006 newsgroup message, Butterfield revealed that he was undergoing chemotherapy.[4] His death from cancer was announced on the comp.sys.cbm newsgroup on 30 June 2007.[5]



  1. ^ Butterfield, C64 Learning Machine Code Programming
  2. ^ Hook, Gail (September 1982). "Meet Jim Butterfield". Compute!. p. 45. Retrieved 30 October 2013. 
  3. ^ "Butterfield Centerfold". The Transactor. 1983-01. p. 33. Retrieved 2 July 2014.  Check date values in: |date= (help)
  4. ^ Jim Butterfield (2006-11-10). "Re: TPUG presents: World of Commodore 2006!". Newsgroupcomp.sys.cbm. Usenetf1i9l2db4tenqp0hkbo091ra69tnggqr9b@4ax.com. http://groups.google.com/group/comp.sys.cbm/msg/ab595abbfc9f039f. Retrieved 2009-06-24.
  5. ^ Amigoat (2007-06-30). "Jim Butterfield". Newsgroupcomp.sys.cbm. Usenet1183234921.929738.81250@o61g2000hsh.googlegroups.com. http://groups.google.com/group/comp.sys.cbm/msg/fc4721a1ac5bf16d. Retrieved 2009-06-24.

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