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Apparatus for displaying a sprite on a screen

  • US 4,951,038 A
  • Filed: 02/25/1988
  • Issued: 08/21/1990
  • Est. Priority Date: 05/15/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for displaying a sprite on a display screen comprising:

  • sprite attribute tables each including coordinates indicating a display position of a sprite, a pattern code defining said sprite in regard to pattern data, and control data defining a display mode of said sprite;

    first detection means for comparing a vertical position value of said coordinates with a raster number to detect a sprite to be displayed;

    a sprite generator storing pattern data of said sprite;

    second detection means for comparing a horizontal position value of said coordinates of said sprite to be displayed with a dot clock signal to detect pattern data to be displayed;

    a pattern data buffer for storing pattern data of said sprite to be displayed in accordance with the reading thereof from said sprite generator;

    means for storing standard coordinates of a display region on said screen;

    a gate circuit for providing said pattern data stored in said pattern data buffer to said screen; and

    means for controlling said screen to display said sprite to be displayed thereon in accordance with said pattern data to be displayed,wherein said controlling means decides selectively an allowance or an inhibition of said transmission of said pattern data in accordance with a comparison of said coordinates indicating said display position with said standard coordinates.

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