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Logical Structure for Efficient Storage of Dot Matrix Patterns

IP.com Disclosure Number: IPCOM000064184D
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Casey, DL Fess, RO Hanson, KC [+details]

Abstract

Dot patterns for dot matrix printers need to be accessed quickly to give a user an acceptable level of performance without wasting data base storage. Three different-sized physical files are used for storing different sizes of patterns depending upon the size of the pattern. A logical file is built over the three physical files such that the user need only remember the name of the logical file. The patterns are stored as though the printer is capable of printing adjacent matrices. When the printer is not capable of printing adjacent matrices in one pass, a masking algorithm is used to determine which dots will be printed on the first pass of the printer and which on the second.