Xerox Data Systems, Inc. (XDS); Xerox Corporation; Honeywell Information Systems, Inc.
These folders include program descriptions of software designed for Sigma 5/9 (also commonly listed as 5-9) computers. Some of these programs were also applicable to the Xerox 550 and 560 computers.
Program Description; Program Listing
Keith G. Calkins collection on Sigma systems
Gift of Keith Calkins