Display control system using a different clock in the graphics m

Details Display control system using a different clock in the graphics m Display control system using a different clock in the graphics m

1994-06-07

1997-06-24

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display driving control circuitry

Physically integral with display elements

345190, 345193, 345213, 345116, G09G 500

Patent

active

056421389

ABSTRACT:
Depending on whether the display mode specified by a CPU is the graphics mode or the text mode, the access mode of an image memory is switched. In the text mode, a random access is executed in a single read cycle with the timing synchronizing a video clock to alternate the reading of character codes and attributes with the reading of character fonts on a character basis. This makes shorter the time that the image memory is occupied for screen refreshing, thereby making so much longer the drawing time of the CPU. Furthermore, because an entire display controller functions as a video clock synchronizing circuit, the function of synchronizing the circuits is not necessary, which results in simplified control.

REFERENCES:
patent: 3609666 (1971-09-01), Kamm
patent: 4663735 (1987-05-01), Novak et al.
patent: 4757309 (1988-07-01), Bowater et al.
patent: 5483257 (1996-01-01), Otake et al.

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