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Hardware Generated Underscore

IP.com Disclosure Number: IPCOM000083975D
Original Publication Date: 1975-Aug-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Anderson, TL: AUTHOR [+3]

Abstract

The underscoring of any character from any character font is accomplished by character generator logic, which utilizes two distinct control commands to store a character into a print line buffer. One command sets an underscore flag on the character as it is stored and the other stores the character without setting the flag.

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Hardware Generated Underscore

The underscoring of any character from any character font is accomplished by character generator logic, which utilizes two distinct control commands to store a character into a print line buffer. One command sets an underscore flag on the character as it is stored and the other stores the character without setting the flag.

An attempt to overprint using the Write and No Space commands from the system with an underscore character activates the control logic. The underscore must be an assigned character from a character set that contains an underscore. When detected, the control logic will flag the characters to be underscored in the page buffer.

Later, during data transfer to the character generation hardware, the designated character will be stored in the print line buffer with the underscore flag set. As the data is scanned for dot matrix character generation, a flagged character will have all bits turned on for the matrix positions which represent the underscore.

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