Digital data display system

Details Digital data display system Digital data display system

G - Physics

09

G

375/12

G09G 1/00 (2006.01) G09G 5/22 (2006.01)

Patent

CA 1155982

DIGITAL DATA DISPLAY SYSTEM ABSTRACT A digital data display system in which the display device includes a plurality of random access stores into which character cell definitions are loaded from a remote central processing unit. A character cell may be a 9 x 16 picture element matrix and each is defined in the c.p.u. according to the requirements of a display request received from a users application program. The system control services include a graphics manager and graphics routines which construct a character buffer and character cell definition table according to the picture to be displayed. A character cell definition that is required more than once in a picture is only included once in the definition table, the character buffer having the required number of pointers to the one definition. When the character buffer and charac- ter definition table have been constructed they are trans- mitted to the display device using a data communication system. The system can be used for colour or monochrome displays.

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