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The Burroughs AN/FST-2 Coordinate Data Transmitting Set (CDTS) Mill Valley Air Force Station was a Cold War military computer system at SAGE radar stations for displaying aircraft tracks and converting them for digital transmission to IBM AN/FSQ-7 Combat Direction Centrals at air defense data centers. Developed by the Great Valley Research Laboratory of the Burroughs Corporation as part of the Electronic Systems Division's 416L network of computers,[1]:241 134 CDTSs were deployed.[2] Each was to "process the raw radar data, antenna position information, and IFF data, and send it over voice grade toll phone lines"[3] at ~1200 baud with 1/4 mile precision.[4] The transmissions were received as "Long Range Radar Input" at SAGE Direction Centers, which performed the aircraft control and warning operations (e.g., launch and flight control for CIM-10 Bomarc SAMs) and provided command information to Command Centers which forwarded data to the NORAD command center in Colorado (Ent AFB, 1963 Chidlaw Building, & 1966 Cheyenne Mountain). The AN/FST-2A included 2 vacuum tube computers and accepted 14 input signals (32 inputs for transistorized AN/FST-2B sets).[5]

Nuvola apps kview.svg External images
Searchtool.svg "AN/FST-2 in SAGE System"
Searchtool.svg AN/FST-2 data flow to AN/FSQ-7
Searchtool.svg end view of racks
Searchtool.svg OA-1204 & -367 consoles


  1. History of Strategic and Ballistic Missile Defense, 1945-1955: Volume I. 
  2. Gray, George (March 1999). "Some Burroughs Transistor Computers" (Wikipedia-styled webpage). Retrieved 2010-01-24. "The Burroughs Great Valley Research Laboratory at Paoli outside Philadelphia… When the system was complete, 134 of these data communications devices had been installed." 
  3. "AN/FST-2, RADAR Data Processor/Network System". Retrieved 2013-01-24. "took raw analog radar data, along with operator overlaid masking (editing), digitized it, and placed it on voice grade toll telephone lines. … The AN/FST-2 used about 8000 vacuum tubes in three bays of racks." 
  4. "title tbd". Retrieved 2013-01-24. "Each system processes data all the time but only the active system transmits data to the direction center and controls the height finder radar. … Data was [digitized] in quarter mile increments. One radar quarter mile was 3.09 microseconds." 
  5. Transmitting Set Coordinate Data. (1965-12-15). Retrieved on 2013-09-18.

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