Video system with combined text and graphics frame memory

Details Video system with combined text and graphics frame memory Video system with combined text and graphics frame memory

1987-08-05

1989-05-02

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340721, 340747, 340750, 340799, G09G 102

Patent

active

048272493

ABSTRACT:
This system includes a composite memory (5) in which are memorized the data for images to be displayed for each frame. A video display processor (12) controls the screen (8). A central processing unit (1) effects the composition of the image with the memory and an address processor (10), the extraction of the point data to be displayed being effected by a time base circuit (BT) synchronized with the sweeping of the screen, and by a control device (15) for dynamic access which distributes the access times among different units utilizing the memory. The memory (5) includes a first control memory for the memorization of a data word for a line or group of lines making up the image, each word having an address value for addressing a second control memory which contains, at each of these addresses, at least one display attribute data word characterizing the contents of the line(s) corresponding to the value of the respective address of the first control memory. A zone memory is provided for storing, in addressable zones, the text or graphics information for those lines which have intelligible information. For each of the lines having such information, a data word following the display attribute data word contains the initial address in the zone memory of the corresponding zone which contains the intelligible information to be displayed on the line.

REFERENCES:
patent: 3591842 (1986-05-01), Clarke, Jr. et al.
patent: 4074254 (1978-02-01), Belser et al.
patent: 4203107 (1980-05-01), Lovercheck
patent: 4249172 (1981-02-01), Watkins et al.
patent: 4308532 (1981-12-01), Murphy
patent: 4543645 (1985-09-01), Vigarie 340703

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