Method and apparatus for processing a line-graphic in a 2 bytes

Details Method and apparatus for processing a line-graphic in a 2 bytes Method and apparatus for processing a line-graphic in a 2 bytes

1992-07-28

1994-02-15

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345141, 340750, 340751, G09G 114, G09G 106

Patent

active

052870944

ABSTRACT:
A method and apparatus for processing a line-graphic in a 2 bytes character mode of a display adapter unit, whereby a line-graphic code can be prevented from being misdiscriminated as a 2 bytes character code in the 2 bytes character mode and be thus processed as a line on a screen. The apparatus comprises a code discriminator for retrieving the most significant bit of each of character codes inputted therein to discriminate whether each of the character codes is a 1 byte character code or a 2 bytes character code and generating a 1 byte/2 bytes character code discriminate signal depending on each of the retrieved most significant bit values, a line-graphic discriminator for decoding each of the character codes inputted therein and generating a line-graphic code discriminate signal if line-graphic codes are inputted successively above a predetermined number of times in accordance with the decoded result, such that the line-graphic codes are processed as 1 byte character codes, and an AND gate for ANDing output signals from the code discriminator and the line-graphic discriminator and outputting the ANDed signal as the final 1 byte/2 bytes character code discriminate signal.

REFERENCES:
patent: 4723217 (1988-02-01), Nakano et al.
patent: 4954979 (1990-09-01), Eibner et al.
patent: 5124694 (1992-06-01), Dien

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