System for displaying character and graphic information on a col

Details System for displaying character and graphic information on a col System for displaying character and graphic information on a col

1977-04-06

1979-12-25

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

273 85G, 354200, 340724, 340750, 340799, G06F 314

Patent

active

041808053

ABSTRACT:
A system for displaying character and graphic information on a color video display utilizes a unique memory architecture. A display memory having a plurality of addressable words corresponding to character positions on the display is utilized to store the digitally coded image signals generated by the processor. A digital processor generates digitally-coded signals indicative of a plurality of character or other graphic color images which are to be displayed on the color video display. Contiguous addresses of the display memory are developed by counters which are also used to generate horizontal and vertical sync signals for the display. A plurality of sets of characters with a plurality of characters per set are stored in a character generator memory. Each word of the display memory is formatted as two bytes. A character memory is provided separately from the display memory, and is addressed by the first byte of the display memory word. Each word of the character memory is partitioned into two bytes, a first byte for addressing the character generator memory to select a character set with the second byte of the display memory word addressing the character generator memory to select a particular character in the selected set to be displayed on the video display. The second byte read from the character memory determines the color of the displayed character, and is applied to a video signal generator along with the output of the character generator memory to produce the desired character or other graphic information on the color video display.

REFERENCES:
patent: 3603962 (1971-09-01), Lechner
patent: 3992702 (1976-11-01), Bailey
patent: 4016362 (1977-04-01), Bristow et al.
patent: 4016544 (1977-04-01), Morita et al.

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