VIDEO GRAPHIC PROGRAM EDITING SYSTEM AND METHOD AND SUPERPOSITION CONTROL CIRCUIT APPLIED TO THE EDITING SYSTEM AND METHOD

摘要

PURPOSE: To easily produce an original video game by providing a control circuit which superposes the editing relative display output on the video graphic program display output. CONSTITUTION: One of two picture processing units PPU includes a circuit which generates the video game display under the control of a game CPU, and the game CPU has an access to one of both RAMs via the PPU in the vertical and horizontal blanking periods. The other PPU generates the editing relative video display through other video RAM under the control of an operating system CPU. These two PPU outputs are inputted to a user TV 15 via a superposition manipulator 216 which is connected to an RGB encoder 218.