Scrolling display refresh memory address generation apparatus

Details Scrolling display refresh memory address generation apparatus Scrolling display refresh memory address generation apparatus

H - Electricity

04

N

352/18.4, 352/40

H04N 5/68 (2006.01) G09G 5/34 (2006.01) G11B 27/10 (2006.01)

Patent

CA 1182918

ABSTRACT OF THE DISCLOSURE A refresh memory address generation apparatus for a video display controller is disclosed wherein rows of character information stored in a display refresh memory may be relocated without requiring the reconstruction of the display information as stored in the display refresh memory. A roll register and PROMs precoded to perform modular addition and multiplication are used to generate an address used to access the display controller refresh memory such that all but one stationary row of information on the display screen may be scrolled (rolled) up. The scrolling of the information on the display screen is accomplished without requiring movement of the display information in the refresh memory, and the only rewrite of information in the refresh memory is done to blank the one row of information which is vacated.

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