avionics-systems

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• The rise and fall of IBM's 4 Pi aerospace computers: an illustrated history

  2026-03-29

  news

  49 min read

  IBM's 4 Pi aerospace computers were integral to the Space Shuttle's first flight on April 12, 1981, managing critical systems below the crew deck. A fifth computer was available as a backup in case of a catastrophic failure of the primary systems.

  ibmaerospace-technologycomputer-history