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Keyboard Switch Algorithm for Accessing Home and Extension Keys From the Prompt Line

IP.com Disclosure Number: IPCOM000059747D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08

Publishing Venue

IBM

Related People

Authors:
Copenhave, MA [+details]

Abstract

In the Displaywrite 3 text processing program for the IBM Personal Computer, the Prompt function can accept characters from the keyboard extension set by an enhancement to its L3P datastream management capability described as follows: 1. A keyboard mode switch indicating the current keyboard mode (either home or extension) is implemented as a toggle flag. 2. The keyboard mode is set or reset each time a switch is detected between keyboards; a keyboard switch occurs each time the operator types a key from a keyboard different from the last key typed. 3. For each keyboard switch, an L3P Graphic Character Set Global identification multi-byte control (SCG) is inserted into the input buffer prior to the current keystroke.