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Graphics processor nonconfined address calculation system

  • US 5,329,617 A
  • Filed: 11/10/1993
  • Issued: 07/12/1994
  • Est. Priority Date: 07/23/1989
  • Status: Expired due to Term
First Claim
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1. A video graphics system, comprising:

  • a display medium having pixel locations arranged in rows with the address location between adjacent rows defined in terms of pitch used for converting X-Y memory addresses consisting of separate X coordinates and Y coordinates into linear physical locations on said display;

    a video presentation memory having established locations therein corresponding to each said pixel location;

    a register for controlling said conversion, said register including a first section storing a first value and a second section storing a second value; and

    circuitry connected to said register for converting pixel display medium address locations from said memory from said X-Y address format used within said memory to said linear addresses based upon said digits in said register, said circuitryif said first value of said first section of said register has a predetermined value, performing a full multiplication of said Y coordinate and said pitch,if said first value of said first section of said register does not have said predetermined value and said second value is zero, shifting said Y coordinate by said first value number of places forming a first resultant, andif said first value of said first section of said register does not have said predetermined value and said second value is not zero, shifting said Y coordinate by said first value number of places forming a first resultant, shifting said Y coordinate by said second value number of places forming a second resultant, and adding said first resultant and said second resultant forming a third resultant.

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