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Character Mode Designation Using Prefix Codes

IP.com Disclosure Number: IPCOM000062314D
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Cecil, RH Gerstle, PJ [+details]

Abstract

Each character stored in a memory of an electronic typewriter has a one-byte prefix code added to it when it is to be expanded, underscored, or both. This allows the display to show the state of each character even if the string of characters that is underscored, expanded, or both is greater than the length of the display. In an electronic typewriter having an 80-character display with keyboard modes and a memory, the state of any particular character or string of characters is usually indicated by inserting markers into the document in memory to indicate the start and end of the specific mode. For example, an underscored word exists in memory as a start underscore code, the word, and an end underscore code.