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- Q3146519 subject Q8529921.
- Q3146519 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.".
- Q3146519 thumbnail Space_Shuttle_upgraded_GPC.jpg?width=300.
- Q3146519 wikiPageExternalLink space_shuttle.html.
- Q3146519 wikiPageExternalLink space_skylab.html.
- Q3146519 wikiPageExternalLink Ch3-2.html.
- Q3146519 wikiPageWikiLink Q1204361.
- Q3146519 wikiPageWikiLink Q167.
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- Q3146519 wikiPageWikiLink Q3114593.
- Q3146519 wikiPageWikiLink Q332809.
- Q3146519 wikiPageWikiLink Q37156.
- Q3146519 wikiPageWikiLink Q3893632.
- Q3146519 wikiPageWikiLink Q4440864.
- Q3146519 wikiPageWikiLink Q609843.
- Q3146519 wikiPageWikiLink Q625642.
- Q3146519 wikiPageWikiLink Q68.
- Q3146519 wikiPageWikiLink Q8529921.
- Q3146519 wikiPageWikiLink Q948200.
- Q3146519 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.".
- Q3146519 label "IBM System/4 Pi".
- Q3146519 depiction Space_Shuttle_upgraded_GPC.jpg.
