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Font Exception Tables Disclosure Number: IPCOM000039004D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01

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Nielsen, LR [+details]


Printers in which the characters are formed by printing selected dots of a high density dot matrix are inherently capable of printing any character set in multiple font styles of any pitch and desired print quality. A known technique for exploiting this capability is to store, in ROS (read-only storage), dot images of all desired characters in all style and pitch variations. Then font tables, which contain the ROS addresses of the images of all the characters required for a particular font, are created and stored in ROS. A particular font is activated for printing use by loading its font table from ROS to an access table in RAM (random-access memory). It is seen that in printer applications using many fonts, considerable memory capacity may be required for the ROS font tables.