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Data processing system having a hierarchy of service computers including a state display

  • US 4,799,155 A
  • Filed: 12/31/1986
  • Issued: 01/17/1989
  • Est. Priority Date: 12/31/1986
  • Status: Expired due to Fees
First Claim
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1. A data processing system comprising, a general-purpose, programmable first computer constructed from a plurality of first circuits, said first circuits having direct connections for accessing said first circuits in connection with the execution of a first program of instructions, said first circuits having first redundant connections for use in accessing said first circuits independently of said first program of instructions, said first computer including first scanner means for accessing said first redundant connections,a programmable second computer constructed from a plurality of second circuits, said second circuits having direct connections for use in the execution of a second program of instructions using selected ones of said second circuits, said second circuits having second redundant connections for accessing said second circuits independently of said second program of instructions, said second computer including second scanner means for accessing said second redundant connections, said second computer connected to said first scanner means whereby said second program controls the accessing of said first circuits through said first redundant connection and independently of said first program of instructions,a programmable third computer constructed from a plurality of third circuits, said third computer executing a third program of instruction, said third computer connected to said second scanner means whereby said third computer controls the accessing of said second circuits through said second redundant connections under control of said third program and independently of said second program, said third computer including means for continuously monitoring said second computer to determine if said second computer requires control by said third computer,a display means for displaying scan data, anda fourth computer coupled to said display means for controlling the display of scan data from said third computer.

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