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AN/FSQ-7: the computer that shaped the Cold War by Bernd Ulmann

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8 Input/output system

The input/output system of an AN/FSQ-7 installation, decoupled by the LOG and MIXD drums as shown in figure 7.7, connected the central computer to the variety of input and output channels such as radar stations, manned interceptor bases, missile bases, other DCs and CCs etc. In essence, three basic types of data transmission regarding such input and output operations can be identified:386

  1. High data-rate sources and sinks which were directly connected to the computer by means of 1,300 bit/s channels over voice-grade telephone lines and radio channels – typical examples are radar inputs and communication links to adjacent centers.387
  2. Lower speed channels used to connect Teletype (TTY) terminals.
  3. Finally, voice communication ...

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