SAGE was an air-defense system, consisting of over 20 locations across the US. Each housed an A/N FSQ-7 computer, which had around 60,000 vacuum tubes. IBM constructed the hardware, based on the Whirlwind, and each computer occupied a huge amount of space. From it's completion in 1954 it analysed radar data in real-time, to provide a complete picture of US Airspace during the cold war.
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