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Keyboard operated terminal apparatus

  • US 4,012,594 A
  • Filed: 08/06/1974
  • Issued: 03/15/1977
  • Est. Priority Date: 08/06/1974
  • Status: Expired due to Term
First Claim
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1. A keyboard operated terminal apparatus comprising:

  • a main memory for storing an N number of data frames, each frame consisting of a given number of characters, each character consisting of a finite number of data bits;

    a display memory for storing a selected one frame of said N number of data frames;

    said data frames being stored statically in said main memory and display memory when the keyboard is not operated;

    means including the keyboard for entering characters of data into said display memory;

    means for entering a frame of data into said main memory;

    means for shifting N-1 frames of data from said main memory and for recalling a selected frame of data for storage in said display memory;

    means for displaying a frame of data statically stored in said display memory;

    means for converting said N number of data frames stored statically in said main memory to an audio signal, said converting means being coupled to the output of said main memory; and

    means for transmitting said audio signal to an apparatus other than said terminal apparatus;

    said display memory, main memory and means for recalling being coupled in a closed feedback loop.

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