See also Photographic Display Unit References Further reading Stories about SAGE - oral history "The largest computer ever built" - "Locklin on science" External links On Guard: The Story of SAGE (1956) IBM Corporation, Military Products Division Cold War Computing: The SAGE System, Computer Museum Computer networks Cold War military equipment of the United States North American Aerospace Defense Command 1950s computers Computer-related introductions in 1958 Lists of Cold War sites 1950s in technology 1950s in the United States