Editing Scientific Data Systems (section)

==Known users==
Although initially intended as a Scientific Computer System, the 900 series and the Sigma series were used extensively in commercial [[time-sharing]] systems. The biggest such user was [[Comshare]] Inc. of [[Ann Arbor, Michigan]], who extensively developed the hardware during the 1980s and the Sigma 9 was operated commercially until c. 1993. Developments and improvements by Comshare included the I-Channel, which allowed the utilization of Bus/Tag (IBM compatible) devices and the ISI Communications interface. These innovations allowed Comshare to capitalize on the Sigma CPU's and their software development (Commander II) by gaining access to current technology storage systems. When Xerox withdrew from the mainframe computer manufacturing business and relinquished all assets to Honeywell Corporation, Comshare opened a Research and Development facility in Phoenix Arizona, where they manufactured three Sigma 9 systems from spare and remanufactured parts acquired from Modutest, Inc. of [[Westlake Village, California]] and Modutest Systems, Inc., [[Phoenix, Arizona]]. Recognition Equipment Inc. of [[Dallas]], [[Texas]] used 910s in the 1960s to control its [[optical character recognition]] machines.

Other known users of SDS systems in the USA include:
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* [[Andrews University]] (Sigma 7)<ref name=Calkins />
* [[Ameren|Central Illinois Light Company (CILCO)]]<ref name=Calkins1 />
* [[Bucknell University]]<ref name=Kirkpatrick />
* [[Caltrans]] (Sigma 5/7, Los Angeles District 5 freeway monitoring center)
* [[Carnegie Mellon University]] (CMU) (Sigma 5, now at the [[Computer History Museum]])
* [[Cummins |Cummins Engine Co.]] (Sigma 9) Columbus, IN
* [[Delco Electronics|Delco]] (Sigma 7, Hybrid Simulation Lab, Goleta, CA)
* [[Eastman Kodak]] 
* [[Grand Valley State University]] (Sigma 6, Allendale, MI) 
* [[Grumman|Grumman Aircraft Company]] (Sigma 5/7 F-14A front seat simulator aka 2F95A at Pacific Missile Test Center, Pt. Mugu, CA)
* [[Hope College]] (Sigma 6) BTM for business and student records plus student online use. (Holland, MI)
* [[Hughes Aircraft]] Company (Sigma 5/7 F-14A rear seat simulator aka 15C9A at Pacific Missile Test Center, Pt. Mugu)
* [[Jet Propulsion Laboratory]], Pasadena (Sigma 5/7, Deep Space Center, bldg 230)
* [[Johns Hopkins University]], Experimental Particle Physics Group (Sigma 7)
* Los Alamos Scientific Laboratory (930)
* Los Angeles County Roads (Sigma 3 traffic light control system)
* [[Marquette University]]<ref name="Calkins1">{{cite web|last=Calkins|first=Keith|title=Former Sigma sites|url=http://www.andrews.edu/~calkins/profess/sigma.htm|access-date=August 29, 2013|archive-date=February 6, 2015|archive-url=https://web.archive.org/web/20150206072552/http://www.andrews.edu/~calkins/profess/sigma.htm|url-status=live}}</ref> (Sigma 9)
* [[Marquardt Aircraft Co.]], Van Nuys, Calif.
* [[McDonnell Douglas]]<ref name=Calkins1 />
* [[Michigan State University]]<ref name=Calkins />
* [[NASA]] (Sigma 5 and Sigma 7 - [[Pioneer program|Pioneer Space Project]])
* [[OCLC|Online Computer Library Center, Inc.]] (OCLC)<ref name=Calkins1/> Sigma6 with OCLC modifications to handle attached IBM 1403 printer and NCR 25&nbsp;MB removable disks. OP/SYS Software updates by Phillip Long.
* [[Queens College, City University of New York]] (Sigma 7) - In Temp 1 building into at least the 1980s 
* Robert Plan Corporation<ref name=Kirkpatrick />
* [[Rochester Institute of Technology]] (RIT) (Sigma 6 academic/administrative computing)
* [[SRI International|Stanford Research Institute]] (SRI) (used for "[[The Mother of All Demos]]" on the [[NLS (computer system)|oN-Line System]] (NLS) in 1968)
* [[University of California, Irvine]] (UCI) Computing Center (Sigma 7)
* [[University of California, Los Angeles]] (UCLA) (Sigma 7) "The first computer on the [[ARPANET]]"
* [[University of Texas at Arlington]] (UTA) (Sigma 7)<ref name=Kirkpatrick />
* University of Texas at Austin (910, 930, Sigma 5)
* [[University of Vermont]] (Sigma 7)
* [[University of Wisconsin–Green Bay]]<ref name=Calkins1 />
* [[University of Wyoming]] (Sigma 5/7)<ref name=Kirkpatrick>{{cite web|last=Kirkpatrick|first=Jim|title=The Sigma Era|url=http://w3.uwyo.edu/~jimkirk/sigma_era.html|archive-url= https://web.archive.org/web/20210421230200/http://w3.uwyo.edu/~jimkirk/sigma_era.html | archive-date=April 21, 2021| access-date=July 17, 2023}}</ref>
* [[Vandenberg Air Force Base]] (Sigma 5/7 data reduction system at South Base)
* [[Vanderbilt University]]<ref name="Kirkpatrick" />
* Warner Computer Systems, Inc.<ref name=Calkins1 />
* [[Washington Metropolitan Area Transit Authority]] (WMATA)<ref name=Calkins1 />
* [[Whirlpool Corporation|Whirlpool]] (Sigma 3 RTM) (Life testing appliances, Benton Harbor, MI)
* [[Wright-Patterson Air Force Base]] (A/D Flight simulation, Dayton, OH)
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* [[Youngstown Sheet and Tube]] research lab was running a Sigma 5 as a [[Hybrid computer]] with an AD 4 analog computer for projects like multiphase diffusion.
* The [[United States Air Force Academy]] (Sigma 5)
* Exploration Data Consultants Lakewood Colorado (Sigma 5)
* [[Martin Marietta]] Denver Aerospace Division (4 Sigma 7 for the MOL Program, SDS-930/Sigma 9 at Digidat division)
* Martin Marietta Dewey Rocky Mountain Cement, Lyons, Colorado (Sigma 2)
* [[United States Air Force|USAF]] [[Buckley AFB]], Colorado (Sigma 3)
* USAF [[Nellis AFB]], Nevada (6 Sigma 9's ACEVAL/AIMVAL Project CUBIC ACMI systems)
* USAF Nellis AFB, Nevada (2 Sigma 9's NTTR Range Control Operations)
* US Navy Yuma Arizona "Top Gun" CUBIC ACMI System (Sigma 5)
* [[Hughes Aircraft Company]], Burbank, California (Sigma 7)
* Global Marine ''[[Glomar Explorer]]'' research vessel (Sigma 2)
* [[University of Southern Mississippi]], Hattiesburg (Sigma 9)
* [[Pacific Bell|Pacific Bell Telephone]], Seattle, Washington (Sigma 3) 
* [[Montana State University]], Bozeman (Sigma 7)
* [[National Bureau of Standards]], Boulder, Colorado (SDS-940)
* Naval Nuclear Lab Idaho Falls Idaho (Sigma 5)
* [[Sunspot Solar Observatory]], Cloudcroft, New Mexico (Sigma 2, Sigma 5)
* [[Motorola|Motorola Electronics]], Scottsdale, Arizona (Sigma 5, Sigma 9)
* [[United Airlines]] Flight Training Center, Denver, Colorado (Sigma 5 LINK and Redifon flight Simulators)
* USAF [[Luke AFB]], Arizona (Sigma 5 LINK Simulator)
* [[Salt River Project]], Phoenix, Arizona (Sigma 2)
* [[Arizona Public Service]], Phoenix, Arizona (Sigma 5)
* [[Tennessee Valley Authority]] (Sigma 5)
* Dallas Power and Light (Sigma 5)
* [[Carolina Power & Light Company|Carolina Power and Light]] (Sigma 5)
* [[Conoco|Conoco Corporation]], Ponca City, Oklahoma (Sigma 7, Sigma 9)
* Space Data Corporation (Sigma 5 White Sands & Poker Flat Alaska)
* [[Los Alamos National Laboratory]] (Sigma 2)
* [[Lawrence Livermore National Laboratory]] (Sigma 7)
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Known users outside the U.S. include:
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* [[British Airways]] (Sigma 2 & 3 - Flight Simulation)
* Link Simulation (Lansing)
* [[WS Atkins]] Engineering (Epsom)
* [[British Aerospace]] (Wharton) (Dual Sigma 5 - MRCA (Tornado) Flight Telemetry)
* [[Carleton University]] (Sigma 9)
* Comshare (London) 
* Cybernetics Research Consultants (Slough)
* Dornier System ( Immenstaad Germany ) MUDAS- & CAMAC-cross-Assembler and other.
* [[Rank Xerox]] (Denham)
* Rank Radio International (Plymouth)
* [[Royal Naval Engineering College]] (Manadon)
* [[Warwick University]] (Sigma 5 - Braille Printer Research)
* [[Liverpool University]] (Sigma 2 - Particle Research)
* [[Addenbrooke's Hospital]] (Cambridge)
* [[Charing Cross Hospital]] (London)
* [[University College Hospital]] (London)
* [[Rolls-Royce and Associates]] (550 - Submarine Power Plant Research)
* [[St Thomas' Hospital]] (London)
* Government Chemist
* [[GCHQ]]
* N.G.T.E. Pyestock ([[National Gas Turbine Establishment]], AKA Ministry of Public Buildings) 
* J. Sefel
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* Watsons (Insurance) Redhill
* [[A&AEE]] Boscombe Down (Sigma 5 - MRCA (Tornado) Flight Telemetry)
* [[RAE Bedford]] (Sigma 9 flight simulator)
* [[Cambridge University]] Department of Engineering (Sigma 6)
* SMRE - Safety in Mines Research Establishment - Sheffield
* [[Aeritalia]] Turin (Sigma 5 - MRCA (Tornado) Flight Telemetry)
* [[Messerschmitt-Bölkow-Blohm|MBB]] Munich (Sigma 5 - MRCA (Tornado) Flight Telemetry)
* [[Imperial Chemical Industries|ICI]] North England (Sigma 2, 3, 5 - Chemical Plant Control)
* [[Sonatrach]] (Algeria)
* Rank Xerox (Milan)
* American Israeli Paper Mills (Israel)
* [[Israeli Navy]] (560)
* [[Israeli Air Force|IAF]] Aircraft (Israel) (Sigma 5 - Flight Telemetry)
* AKU Studsvik (Sweden) (Dual Sigma 9 - Nuclear Power Station Simulators)
* [[Vattenfall]] Vällingby (Sweden) (Dual Sigma 9 - Electricity Grid Monitoring)
* West Chester University (Sigma 9 and X560)
* [[University of Toronto Libraries|UTLAS]] (prev. University of Toronto Library Automation Systems) (Sigma 5, 7, 9)
* [[Dalhousie University]] (Sigma 5 with Honeywell memory mapping upgrade)
* [[Mitsubishi Heavy Industries]] Tsuruga Japan (Sigma 5 - Nuclear Core Simulator)
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