The Keith G. Calkins collection on Sigma systems consists of material documenting the Sigma computers developed and released
by Scientific Data Systems (SDS), Xerox, Honeywell, Inc., and Telefile Computer Products. The collection holds records from
all of these companies as well as the user groups focused on Sigma machines and their operating systems and software. Included
in the collection are program descriptions of software designed for Sigma systems, manuals, maintenance and testing reports,
conference proceedings, and records relating to Telefile Computer Products and its user group TeleXchange. Sigma machines
were released and operated primarily from 1966 through 1993 and the material in this collection spans 1969 through 1987.
Keith G. Calkins was born in Cadillac, Michigan on February 1, 1958. Most of his education was spent at Andrews University
in Berrien Springs, Michigan, where he received a BS in mathematics in 1981, an MS in computer information science in 1982,
another BS in physics in 1988, a second MS in interdisciplinary studies (math and physics) in 1996, and a Master of Arts in
Teaching (MAT) in 2002. Calkins also attended the University of Notre Dame, receiving an MS in physics in 1996 and a PhD in
2005, also in physics. Calkins' work experience includes consulting for Artware, Telefile, and NASA and working in various
teaching roles including at Andrews University as an Associate Professor of Math & Science and at Ferris State University
as an Adjunct Instructor in the Department of Physical Sciences.
10.75 Linear feet,
8 record cartons and 1 small box
The Computer History Museum (CHM) can only claim physical ownership of the collection. Users are responsible for satisfying
any claims of the copyright holder. Requests for copying and permission to publish, quote, or reproduce any portion of the
Computer History Museum's collection must be obtained jointly from both the copyright holder (if applicable) and the Computer
The collection is open for research.