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Row grabbing video display terminal having local programmable control thereof

  • US 4,135,213 A
  • Filed: 04/23/1976
  • Issued: 01/16/1979
  • Est. Priority Date: 09/10/1975
  • Status: Expired due to Term
First Claim
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1. A real time frame grabbing video display terminal for substantially instantaneously providing a continuous direct video display of a selectable predetermined video frame of information on a video display means from continuously receivable information remotely provided over a transmission media, said continuously receivable information comprising a plurality of pseudo video scan lines, each of said pseudo video scan lines having a television video scan line format and capable of comprising a complete self-contained packet of digital information sufficient to provide an entire displayable row of video data characters, said pseudo video scan line having an associated transmission time equivalent to said television video scan line, said packet of digital information comprising at least address information for said displayable row and data information for said displayable characters in said displayable row, said pseudo video scan line being a composite video signal, said terminal comprising microcomputer means for controlling the operation thereof, said microcomputer means being operatively connected to said transmission media for receiving said continuously receivable information, selection means operatively connected to said microcomputer means for variably selecting said predetermined video frame to be continuously displayed, local storage means for selectably retrievably locally storing said continuously receivable video displayable data corresponding to said predetermined video frame, said local storage means being operatively connected to said microcomputer means, means operatively connectable to said microcomputer means, to said selection means and to said local storage means for selectively controlling the local storage of said continuously receivable information in said local storage means, said local storage selective control means comprising read only memory means comprising a condition responsive network for controlling said microcomputer means in accordance with a predetermined set of conditions for enabling said direct video display of said selected predetermined video frame from said plurality of continuously received pseudo video scan lines, and video display means operatively connected to said microcomputer means and said local storage means for providing said direct video display, said microcomputer means comprising means for processing said continuously received composite pseudo video scan lines for providing retrievable locally storable displayable video row data to said local storage means from each of said received pseudo video scan line signals pertaining to said selected predetermined video frame and a displayable video row signal to said video display means from said local storage means from each of said locally stored predetermined video frame pertaining pseudo video scan line signals for enabling said direct video display, said microcomputer means processing said continuously received composite pseudo video scan lines in accordance with said predetermined set of conditions, whereby said continuous direct video display of said selected predetermined video frame of information from said continuously received information is substantially instantaneously provided.

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