Bally Manufacturing Corporation

Atish Ghosh

John J Pasierb, Jr

John Pasierb

A priority ordered multiple video object display system is disclosed for use with a raster scan display having a plurality of display locations on a plurality of display lines. The display system comprises means for generating a list of ordered video object data packets, and buffer means for storing the list of ordered data packets at locations spatially associated with respective display locations. Also included are means for varying the order in which the packets are written into the buffer means, and means for selectively suppressing zero overwrite for secondary writes to a single location in said buffer means during the construction of a common single display line stored within said buffer means. A method of presenting a video display is also disclosed.

Prioritized overlay of foreground objects line buffer system for a video

A line buffer system can display a large number of objects and a background in connection with the play of a video-type game. The system may be used with a microprocessor. Game data is transmitted from the microprocessor during a brief 'handshake' operation which may occur at any time. The game data specifies the objects and background to be presented and the screen location of each. The objects and background, respectively, are stored as rectangular blocks in two memories. At least two buffers are provided, each buffer capable of storing data to represent one line of the picture. The system operates upon the game data to load the buffers in real time during picture drawing and just prior to picture drawing. One buffer then outputs a data stream to provide real time control of the drawing of one line of a picture. A flip feature provides for inverting any object or an entire picture about a vertical or horizontal axis, or both.

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Glendale Heights, IL, United States of America

Atish Ghosh