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Explicit Display of Multiply Mapped Characters

IP.com Disclosure Number: IPCOM000078814D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Bennett, JL: AUTHOR

Abstract

On some graphic display devices, the same character is used to represent more than one bit-pattern. This description suggests how a user of a display device can be provided with a means for determining which characters are ambiguous and which bit-patterns underlie them. Two alternatives are:

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Explicit Display of Multiply Mapped Characters

On some graphic display devices, the same character is used to represent more than one bit-pattern. This description suggests how a user of a display device can be provided with a means for determining which characters are ambiguous and which bit-patterns underlie them. Two alternatives are:

(1) When a nondestructive cursor is positioned by an authorized user to a character, then a distinctive indication appears which enables the user to determine which of several possible underlying bit-patterns occurs. If the character is uniquely represented, then no change in displayed character occurs. When the cursor is moved to another character position, the character returns to its normally displayed form.

(2) A special function key is provided which, when depressed by an authorized user, causes each character on the screen which is generateable from more than one bit-pattern to take on a distinctive indication, thus enabling the user to determine which of several possible underlying patterns occurs. If a character is already uniquely represented, then no change in the character occurs. When the key is released, the entire display returns to its normally displayed form.

There are at least two applications where the described capability has value: text editing and display of security-sensitive data. TEXT EDITING:.

For the purpose of proofreading during the editing process, it is often desirable to display certain different bit-patterns as the same character. For example, it is sometimes desired to have two or more different keyboard keys (encoded as different bit-patterns) produce the same character on the display screen. Thus, the displayable "space character" (displayed as "no character" in a screen position) is produced When the operator pushes the "variable-space bar" or the "fixed-space bar," and when the terminal hardware supplies...