Display controller having a function of controlling various disp

Details Display controller having a function of controlling various disp Display controller having a function of controlling various disp

1989-01-30

1991-11-26

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340799, 340803, G09G 114, G09G 102, G09G 300

Patent

active

050686488

ABSTRACT:
There is disclosed a graphics display controller for controlling a display memory, which includes a display address register temporarily storing an address which is changed in a predetermined cycle during a display period, a first circuit for producing a first signal each time less significant bits of the address becomes the same value as each other, a second circuit for producing a second signal each time a horizontal scan line to be displayed changes, and a third circuit for producing a display memory access request signal in response to the first or second signal. The controller further includes a flag register and a mask circuit, this mask circuit masking the second signal to prevent it from being transferred to the third circuit when the flag register stores first information, and allowing the second signal to be transferred to the third circuit when the flag register stores the second information.

REFERENCES:
patent: 4249172 (1981-02-01), Watkins et al.
patent: 4368466 (1983-01-01), Dwire
patent: 4628467 (1986-12-01), Nishi et al.
patent: 4648077 (1987-03-01), Pinkham et al.
patent: 4663735 (1987-05-01), Novak et al.
patent: 4868557 (1989-09-01), Perlman
patent: 4876663 (1989-10-01), McCord
patent: 4897636 (1990-01-01), Nishi et al.

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