Patent
1992-07-29
1996-06-11
Powell, Mark R.
395166, G06K 1500
Patent
active
055264700
ABSTRACT:
Within a document printing system, a dot generator for determining dot ON/OFF states for a multiple channel matrix print head includes a RAM memory in which is stored print characters received from the print system. The received print characters are stored in ASCII format in predetermined character box memory locations within the RAM memory. The dot generator further includes a ROM memory having (1) a first storage area containing an association table correlating each one of the dot print addresses or locations within the document print zone with one of the character box memory locations within the RAM memory; (2) a second storage area containing an association table correlating each one of the dot print locations with a character box print location row and column number; and (3) a third storage area containing dot state ON/OFF values corresponding to each row of each standard ASCII character. A ROM lookup procedure is utilized to determine the ON/OFF state for each dot location within the print zone. In brief, the dot generator performs the followings steps:
REFERENCES:
patent: 4480541 (1984-11-01), Grummett
patent: 4567570 (1986-01-01), Peer
patent: 4715006 (1987-12-01), Nagata
patent: 4763281 (1988-08-01), Arakawa
patent: 4837712 (1989-06-01), Shibamiya
patent: 4866671 (1989-09-01), Yokoyama
patent: 4978971 (1990-12-01), Goetz et al.
NCR Corporation
Popovici Dov
Powell Mark R.
Stover James M.
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