Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/IBM_System/4_Pi> ?p ?o }
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- 4_Pi abstract "The IBM System/4 Pi is a family of avionics computers used, in various versions, on the F-15 Eagle fighter, E-3 Sentry, AWACS, Harpoon Missile, NASA's Skylab, MOL, and the Space Shuttle, as well as other aircraft. It descends from the approach used in the System/360 mainframe family of computers in that members of the family were intended for use in many varied user applications. Previously custom computers had been designed for each aerospace application which was extremely costly.The Skylab space station employed the model TC-1, which had a 16-bit word length and 16,384 words of memory with a custom input/output assembly.The top-of-the-line 4 Pi is the AP-101, used in the AWACS. The U.S. Navy used a similar variant, the AN/ASQ-155, in the carrier based A-6E/A-6E TRAM medium attack aircraft. The Shuttle is controlled by five AP-101 computers, three of which are arranged in a Triple Modular Redundant configuration, one was kept powered up as a \"hot spare\" and one was maintained powered down as a \"cold spare\"redundant .The name of the system is derived from the fact that the angular measure of a complete sphere (solid angle) is 4π steradians, while the angular measure of a complete circle is 360 degrees; hence System/4 Pi and System/360. This implies that System/4 Pi is a version of the IBM System/360 for the three-dimensional world of avionics. This was only for marketing purposes because neither the electronics, architecture nor software were related to the IBM commercial 360 line.".
- 4_Pi thumbnail Space_Shuttle_upgraded_GPC.jpg?width=300.
- 4_Pi wikiPageExternalLink space_shuttle.html.
- 4_Pi wikiPageExternalLink space_skylab.html.
- 4_Pi wikiPageExternalLink Ch3-2.html.
- 4_Pi wikiPageID "858524".
- 4_Pi wikiPageLength "3857".
- 4_Pi wikiPageOutDegree "28".
- 4_Pi wikiPageRevisionID "703854124".
- 4_Pi wikiPageWikiLink 16-bit.
- 4_Pi wikiPageWikiLink ASQ-155.
- 4_Pi wikiPageWikiLink Attack_aircraft.
- 4_Pi wikiPageWikiLink Avionics.
- 4_Pi wikiPageWikiLink Boeing_E-3_Sentry.
- 4_Pi wikiPageWikiLink Category:Guidance_computers.
- 4_Pi wikiPageWikiLink Category:IBM_computers.
- 4_Pi wikiPageWikiLink Computer.
- 4_Pi wikiPageWikiLink Degree_(angle).
- 4_Pi wikiPageWikiLink Dimension.
- 4_Pi wikiPageWikiLink Grumman_A-6_Intruder.
- 4_Pi wikiPageWikiLink IBM.
- 4_Pi wikiPageWikiLink IBM_AP-101.
- 4_Pi wikiPageWikiLink 360.
- 4_Pi wikiPageWikiLink IBM_mainframe.
- 4_Pi wikiPageWikiLink Manned_Orbiting_Laboratory.
- 4_Pi wikiPageWikiLink McDonnell_Douglas_F-15_Eagle.
- 4_Pi wikiPageWikiLink NASA.
- 4_Pi wikiPageWikiLink Pi.
- 4_Pi wikiPageWikiLink Redundancy_(engineering).
- 4_Pi wikiPageWikiLink Skylab.
- 4_Pi wikiPageWikiLink Solid_angle.
- 4_Pi wikiPageWikiLink Space_Shuttle_program.
- 4_Pi wikiPageWikiLink Steradian.
- 4_Pi wikiPageWikiLink Word_(computer_architecture).
- 4_Pi wikiPageWikiLink File:Space_Shuttle_upgraded_GPC.jpg.
- 4_Pi wikiPageWikiLinkText "AN/ASQ-155".
- 4_Pi wikiPageWikiLinkText "IBM System/4 Pi".
- 4_Pi wikiPageWikiLinkText "Skylab Onboard Computers".
- 4_Pi wikiPageWikiLinkText "Space Shuttle General Purpose Computer".
- 4_Pi wikiPageUsesTemplate Template:Cite_journal.
- 4_Pi wikiPageUsesTemplate Template:Component-aircraft-stub.
- 4_Pi wikiPageUsesTemplate Template:Guidance_Computer.
- 4_Pi wikiPageUsesTemplate Template:Merge_from.
- 4_Pi wikiPageUsesTemplate Template:Reflist.
- 4_Pi wikiPageUsesTemplate Template:Space-stub.
- 4_Pi subject Category:Guidance_computers.
- 4_Pi subject Category:IBM_computers.
- 4_Pi hypernym Family.
- 4_Pi type Avionic.
- 4_Pi type Component.
- 4_Pi type Computer.
- 4_Pi type Product.
- 4_Pi comment "The IBM System/4 Pi is a family of avionics computers used, in various versions, on the F-15 Eagle fighter, E-3 Sentry, AWACS, Harpoon Missile, NASA's Skylab, MOL, and the Space Shuttle, as well as other aircraft. It descends from the approach used in the System/360 mainframe family of computers in that members of the family were intended for use in many varied user applications.".
- 4_Pi label "IBM System/4 Pi".
- 4_Pi sameAs Q3146519.
- 4_Pi sameAs 4_Pi.
- 4_Pi sameAs 4_Pi.
- 4_Pi sameAs m.03hxm2.
- 4_Pi sameAs Q3146519.
- 4_Pi wasDerivedFrom 4_Pi?oldid=703854124.
- 4_Pi depiction Space_Shuttle_upgraded_GPC.jpg.
- 4_Pi isPrimaryTopicOf 4_Pi.
