THIS FILM IS PUBLIC DOMAIN (continued from part 1...) The AN/FSQ-7 is the largest computer ever built, and will likely hold that record in the future. Each machine used 55000 vacuum tubes, about ½ acre (2000 m²) of floor space, weighed 275 tons and used up to three megawatts of power, although the failure rate of an individual tube was low due to efforts in quality control. Each SAGE site included two computers for redundancy, with one processor on "hot standby" at all times. In spite of the poor reliability of the tubes, this dual-processor design made for remarkably high overall system uptime. 99% availability was not unusual. SAGE operator's terminal. The light pen, which was shaped similar to a handheld power drill or gun, is resting on the console. The terminal's desk contains a built-in ash tray just left of the light pen. SAGE operator's terminal. The light pen, which was shaped similar to a handheld power drill or gun, is resting on the console. The terminal's desk contains a built-in ash tray just left of the light pen. SAGE sites were connected to multiple radar stations which transmitted tracking data (range and azimuth) in digitized format by modem over ordinary telephone lines. These digitized inputs were automatically prepared from analog radar inputs by the AN/FST-2B (or successor, AN/FYQ-47[1]) at the radar stations. The SAGE computers then collected the tracking data for display on a CRT as icons. Situation Display (SD) console operators at the center ...
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