Display system with fewer display memory chips

Details Display system with fewer display memory chips Display system with fewer display memory chips

1987-12-21

1990-06-05

Clark, David L.

Boots, shoes, and leggings

340799, G06F 1202

Patent

active

049319582

ABSTRACT:
For reducing the number of display data RAM chips to designate one pattern of a character pattern ROM which contains patterns of a large number of characters and needs a large number of bits to be designated, a clock signal whose cycle time is the same or less than the updating cycle time of the designating address data of the display data RAM is employed to address the display data RAM. Conventionally, the data of the display data RAM to designate the character pattern ROM is stored separately in different chips when the data length (bit number) becomes large. But, according to the present invention, the data is stored separately in one chip.

REFERENCES:
patent: 4298931 (1981-11-01), Tachiuchi et al.
patent: 4462028 (1984-07-01), Ryan et al.
patent: 4468662 (1984-08-01), Tanaka
patent: 4663619 (1987-05-01), Staggs et al.

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