The Telegraph and The Digital Revolution

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The Telegraph

Pulse Width Modulation Code

  • akin to Morse code
    • based upon letter frequency in Delang
    • a shift character code switches between letters and numbers and punctuation
      • each transmission blocks are separated by two shift characters
        Ex: SHIFT SHIFT T H I S SPACE I S SPACE A SPACE T E S T SHIFT 1 2 3 SHIFT SHIFT
    • numbers 1-5 is 1 to 5 dots, while 6 to 9 is one dash and 1 to 4 dots. zero is two dashes
      1 ▄▄, 2 ▄▄▄▄, 3 ▄▄▄▄▄▄, 4 ▄▄▄▄▄▄▄▄, 5 ▄▄▄▄▄▄▄▄▄▄, 6 ▄▄▄▄▄▄, 7 ▄▄▄▄▄▄▄▄, 8 ▄▄▄▄▄▄▄▄▄▄, 9 ▄▄▄▄▄▄▄▄▄▄▄▄, 0 ▄▄▄▄▄▄▄▄

The Digital Revolution

The First Computers

  • wire based digital storage using PWMC
    • the digital storage was constructed using a telegraph key as output, a long coiled string, and a pickup transducer to pick up the signal
    • required a refresh circuit

Zero Deliminated Character Code

  • binary stream based digital storage
  • based upon Pulse Width Modulation Code
  • shift character codes switches between lower case, upper case, numbers, punctuation, and codes
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