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Alternative Keystroke Functions Using Option Director Mask

IP.com Disclosure Number: IPCOM000088996D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Prokop, CJ: AUTHOR

Abstract

Option director masks are provided for a keyboard input, processor-based machine to eliminate redundant and multiple overlays of a random-access memory keyboard distributor in order to change the function defined for a particular keystroke. The keyboard distributor 1 is a control routine which senses a keystroke and passes control to an appropriate service routine by branching to an address stored in a table associated with the keyboard.

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Alternative Keystroke Functions Using Option Director Mask

Option director masks are provided for a keyboard input, processor-based machine to eliminate redundant and multiple overlays of a random-access memory keyboard distributor in order to change the function defined for a particular keystroke. The keyboard distributor 1 is a control routine which senses a keystroke and passes control to an appropriate service routine by branching to an address stored in a table associated with the keyboard.

A single keyboard distributor overlay 2 is provided, consisting of all possible keystroke processing and handling locator elements for a given application within the overall processing system. An Y-bit keystroke function mask (KFM) 3 is provided which corresponds to the N-possible locator elements within the keyboard distributor 1. This KFM 3 is defined to provide a binary indication for particular keystrokes of the keyboard distributor as to the option of processing the keystroke using the "normal" function or requesting an alternative keystroke processing function.

Referring to the figure, depression of the entry key 6 selects an address in the keyboard distributor 1 which points to the key handler routine 4 for the desired function. Each key handler routine 4 contains a transfer node 5 which invokes a centralized alternative hierarchy process for the purpose of obtaining the option director mask 3 and hierarchically utilizing the binary conditions preset in the mask to...