Crt display control system

Details Crt display control system Crt display control system

G - Physics

09

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355/19

G09G 1/16 (2006.01) G09G 1/28 (2006.01) G09G 5/02 (2006.01) G09G 5/12 (2006.01)

Patent

CA 1222063

ABSTRACT OF THE DISCLOSURE A CRT display control system has a display timing signal and a clock signal applied to the signal input terminal and the clock input terminal of a flip-flop, respect- ively, a vertical retrace signal being output from the out- put terminal of the flip-flop, and a microprocessor display- ing the specified data on the CRT display in accordance with the vertical retrace signal. In addition, a CRT display control system for scroll display consists of a first counter to obtain vertical pulses for CRT vertical scanning by dividing horizontal pulses for CRT horizontal scanning, and an image memory to store image information from one or more screens, and a second counter to obtain an image memory read-out timing signal by dividing the horizontal pulses at a dividing ratio slightly different from that of the first counter.

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