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AN/FSQ-31 SAC Data Processing System
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<h2 id="description">Description</h2> <p>The FSQ-31 included: </p> <ul><li><a href="/facts/IBM_4020_Military_Computer/lhBWdTo4">IBM 4020 Military Computer</a><a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> with Programming and Numerical System and "Arithmetic Unit including storage access", liquid-cooled Ferrite Core storage (65,536 <a href="/facts/Word_(computer_architecture)/2e5umRaj">words</a>), High-Speed Input/Output to the Drum Memory system,<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> and the Low-Speed Input/Output section to interface with several different devices:</li></ul> <ul><li>Electronic Data Transmission Communications Central (EDTCC) at 4 "zone-of-interior headquarters bases" for EDT with "outlying" Remote Communications Centrals (e.g., routing "to RCC's, computer (DPC's), or the display devices.")<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a></li> <li>Tape Controllers 1 and 2, connected to 16 <a href="/facts/IBM_729/YelQt3Pq">IBM 729</a>-V Tape Drives</li> <li>Disk File Controller, which was a modified Tape Controller, connected to the <ul><li>Bryant PH 2000 Disk File, which had 24 disks that were 39 inches in diameter, 125 read/write heads that were hydraulically actuated, and had a total capacity of 26 <a href="/facts/Megabyte/RBF4XpWb">MB</a></li></ul></li> <li><a href="/facts/IBM_1401/SrdHgTWx">IBM 1401</a>, which controlled data transfers from unit-record equipment: <ul><li><a href="/facts/IBM_1402/sUcqbWAz">IBM 1402</a> Card Reader/Punch</li> <li><a href="/facts/IBM_1403/QFmmBv2m">IBM 1403</a> Line Printer</li> <li>2 <a href="/facts/IBM_729/YelQt3Pq">IBM 729</a>-V Tape Drives</li></ul></li> <li>2 <a href="/facts/IBM_Selectric/1WVhgxhL">IBM Selectric</a> Typewriters, (I/O Typewriters) one of which was used for operational messages and the other for diagnostic messages and maintenance activities.</li></ul> <ul><li>Advanced Display Console<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a></li> <li><a href="/facts/Drum_memory/yul0r8nG">Drum memory</a> system with controller and two vertical drum memory devices. Each drum read and wrote 50 bits at a time in parallel so transferring data could be done quickly. The drums were organized as 17 fields with 8192 words per field for a total capacity of 139264 words. The motors that rotated the drums required 208 VAC at 45 Hz so a motor generator unit was required to change the frequency from 60 Hz. This added to the noise level in the computer room.</li> <li><a href="/facts/Rockwell-Collins/QypYFE6y">Rockwell-Collins</a> modem<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a></li> <li>Water chilling system for maintaining the liquid coolant temperature in the IBM 4020<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a></li></ul> <p>SACCS systems outside of the AN/FSQ-31 included the <a href="https://fas.org/nuke/guide/usa/c3i/cvpmrjan/sld010.htm">Subnet Communications Processor</a> and the <a href="https://fas.org/nuke/guide/usa/c3i/cvpmrjan/sld009.htm">SACCS Software Test (SST) Facility</a> at the Offutt command center (the backup SCP was at Barksdale AFB.)<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> SAC's QOR for the National Survivable Communications System (NSCS) was issued 13 September 1958;<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a>: 175 and in September 1960 the "installation of a SAC display warning system" included 3 consoles in the Offutt command center.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a>: 218 </p><p>Initial weight: 105,650 pounds (52.8 short tons; 47.9 t).<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> </p> <h3>Memory</h3> <p>The Q-31s were equipped with four 16 <a href="/facts/Word_(computer_architecture)/2e5umRaj">kiloword</a> memory banks. The memory bank was oil and water cooled. Also considered as part of the memory subsystem in that they were addressed via fixed reserved memory addresses, were four 48 position switch banks, in which a short program could be inserted, and a <a href="/facts/Plugboard/fE3HX8tS">plugboard</a>, similar to the one used in <a href="/facts/IBM/QszA7nwd">IBM</a> <a href="/facts/Unit_record_equipment/xkRvng9j">unit record equipment</a>, that had the capacity of 32 <a href="/facts/Word_(data_type)/2e5umRaj">words</a>, so longer <a href="/facts/Bootstrapping/6dkM4EQv">bootstrap</a> or diagnostic programs could be installed in plug panels which could then be inserted into the receptacle and used. This served as a primitive <a href="/facts/Read-Only_Memory/P9QMuDLH">ROM</a>. </p> <h2 id="see-also">See also</h2> <ul> <li>Electronics portal</li></ul> <ul><li><a href="/facts/List_of_military_electronics_of_the_United_States/xD9ktU3e">List of military electronics of the United States</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Weik, Martin H. (March 1961). "Chapter II: Computing System Description". A Third Survey of Domestic Electronic Digital Computing Systems. Ballistic Research Laboratory. p. 0044 (start page). Report No. 1115. Retrieved 1 April 2014. <a href="http://ed-thelen.org/comp-hist/BRL61-a.html" target="_blank">http://ed-thelen.org/comp-hist/BRL61-a.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Weik, Martin H. (March 1961). "Chapter II: Computing System Description". A Third Survey of Domestic Electronic Digital Computing Systems. Ballistic Research Laboratory. p. 0044 (start page). Report No. 1115. Retrieved 1 April 2014. <a href="http://ed-thelen.org/comp-hist/BRL61-a.html" target="_blank">http://ed-thelen.org/comp-hist/BRL61-a.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Wohlman, John (1968). "An Aid to Command and Control". Computer-Generated Map Data. Air University Review. Archived from the original on 9 March 2009. Retrieved 20 June 2006. <a href="https://web.archive.org/web/20090309010149/http://www.airpower.maxwell.af.mil/airchronicles/aureview/1968/jan-feb/wohlman.html" target="_blank">https://web.archive.org/web/20090309010149/http://www.airpower.maxwell.af.mil/airchronicles/aureview/1968/jan-feb/wohlman.html</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Paul N. Edwards (1996). The Closed World: Computers and the Politics of Discourse in Cold War America. MIT Press. p. 107. ISBN 0-262-05051-X. SAGE—Air Force project 416L—became the pattern for at least twenty-five other major military command-control systems… These were the so-called "Big L" systems [and] included 425L, the NORAD system; 438L, the Air Force Intelligence Data Handling System; and 474L, the Ballistic Missile Early Warning System (BMEWS). … Project 465L, the SAC Control System (SACCS) [with] over a million lines, reached four times the size of the SAGE code and consumed 1,400 man-years of programming; SDC invented a major computer language, JOVIAL, specifically for this project. … In 1962 the SACCS was expanded to become [WWMCCS] <a href="0-262-05051-X" target="_blank">0-262-05051-X</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>SAC missile chronology <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Coleman, DA. "[biographical anecdote]". www.DAColema.com. Archived from the original on 7 April 2014. Retrieved 1 April 2014. <a href="https://web.archive.org/web/20140407075359/http://www.dacoleman.com/work%20history.html" target="_blank">https://web.archive.org/web/20140407075359/http://www.dacoleman.com/work%20history.html</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Gorenstein, S. (15 March 1963). A Simplified Queuing Model for the 465L System (PDF) (Report). System Development Corporation. Archived from the original (Technical Memorandum) on 7 April 2014. Retrieved 2 April 2014. All incoming messages to the EDTCC are automatically switched and routed to the designated locations. <a href="https://web.archive.org/web/20140407090205/http://www.dtic.mil/dtic/tr/fulltext/u2/402626.pdf" target="_blank">https://web.archive.org/web/20140407090205/http://www.dtic.mil/dtic/tr/fulltext/u2/402626.pdf</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Gorenstein, S. (15 March 1963). A Simplified Queuing Model for the 465L System (PDF) (Report). System Development Corporation. Archived from the original (Technical Memorandum) on 7 April 2014. Retrieved 2 April 2014. All incoming messages to the EDTCC are automatically switched and routed to the designated locations. <a href="https://web.archive.org/web/20140407090205/http://www.dtic.mil/dtic/tr/fulltext/u2/402626.pdf" target="_blank">https://web.archive.org/web/20140407090205/http://www.dtic.mil/dtic/tr/fulltext/u2/402626.pdf</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>"The IBM 4020 Military Computer" (PDF). IBM Federal Systems Division. 31 October 1959. Retrieved 28 September 2009. <a href="http://bitsavers.org/pdf/ibm/4020/4020_Military_Computer_General_Info_Oct59.pdf" target="_blank">http://bitsavers.org/pdf/ibm/4020/4020_Military_Computer_General_Info_Oct59.pdf</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>SAC missile chronology <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"The IBM 4020 Military Computer" (PDF). IBM Federal Systems Division. 31 October 1959. Retrieved 28 September 2009. <a href="http://bitsavers.org/pdf/ibm/4020/4020_Military_Computer_General_Info_Oct59.pdf" target="_blank">http://bitsavers.org/pdf/ibm/4020/4020_Military_Computer_General_Info_Oct59.pdf</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>http://bitsavers.org/pdf/ibm/4020/ Bitsavers.org IBM 4020 documentation <a href="http://bitsavers.org/pdf/ibm/4020/" target="_blank">http://bitsavers.org/pdf/ibm/4020/</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>Gorenstein, S. (15 March 1963). A Simplified Queuing Model for the 465L System (PDF) (Report). System Development Corporation. Archived from the original (Technical Memorandum) on 7 April 2014. Retrieved 2 April 2014. All incoming messages to the EDTCC are automatically switched and routed to the designated locations. <a href="https://web.archive.org/web/20140407090205/http://www.dtic.mil/dtic/tr/fulltext/u2/402626.pdf" target="_blank">https://web.archive.org/web/20140407090205/http://www.dtic.mil/dtic/tr/fulltext/u2/402626.pdf</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>"The IBM 4020 Military Computer" (PDF). IBM Federal Systems Division. 31 October 1959. Retrieved 28 September 2009. <a href="http://bitsavers.org/pdf/ibm/4020/4020_Military_Computer_General_Info_Oct59.pdf" target="_blank">http://bitsavers.org/pdf/ibm/4020/4020_Military_Computer_General_Info_Oct59.pdf</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Coleman, DA. "[biographical anecdote]". www.DAColema.com. Archived from the original on 7 April 2014. Retrieved 1 April 2014. <a href="https://web.archive.org/web/20140407075359/http://www.dacoleman.com/work%20history.html" target="_blank">https://web.archive.org/web/20140407075359/http://www.dacoleman.com/work%20history.html</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Weik, Martin H. (March 1961). "Chapter II: Computing System Description". A Third Survey of Domestic Electronic Digital Computing Systems. Ballistic Research Laboratory. p. 0044 (start page). Report No. 1115. Retrieved 1 April 2014. <a href="http://ed-thelen.org/comp-hist/BRL61-a.html" target="_blank">http://ed-thelen.org/comp-hist/BRL61-a.html</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>"PPT Slide". <a href="https://fas.org/nuke/guide/usa/c3i/cvpmrjan/sld010.htm" target="_blank">https://fas.org/nuke/guide/usa/c3i/cvpmrjan/sld010.htm</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Moriarty, J. K. (June 1975). The Evolution of U.S. Strategic Command and Control and Warning: Part Two (1954-1960) (Report). Institute for Defense Analyses. pp. 139–266. <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>Moriarty, J. K. (June 1975). The Evolution of U.S. Strategic Command and Control and Warning: Part Two (1954-1960) (Report). Institute for Defense Analyses. pp. 139–266. <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>Weik, Martin H. (March 1961). "Chapter II: Computing System Description". A Third Survey of Domestic Electronic Digital Computing Systems. Ballistic Research Laboratory. p. 0044 (start page). Report No. 1115. Retrieved 1 April 2014. <a href="http://ed-thelen.org/comp-hist/BRL61-a.html" target="_blank">http://ed-thelen.org/comp-hist/BRL61-a.html</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> </ol>