A system which interprets the contents of address and data fields provided by a central processing unit 1 which controls the display. The address fields are selectively interpreted to obtain a direct access by the central processing unit to a general system memory 5, or so as to constitute instructions...http://www.google.com.tw/patents/US4799146?utm_source=gb-gplus-share專利 US4799146 - System for displaying graphic information on video screen employing video display processor
