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Display Control Circuit

IP.com Disclosure Number: IPCOM000062089D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Maezawa, Y [+details]

Abstract

The display control circuit for performing a keyed function in accordance with the operating status of the display workstation includes a status register which stores bit patterns representing the operating status of the display workstation, a condition table which stores bit patterns of keyed internal code, and a function subroutine vector table which selects the function of the display workstation in response to ANDed results of the bit pattern of the operating status and the bit pattern of the internal code. Each key on the keyboard of the display workstation is assigned to various functions. One of the functions is selected in accordance with the shift status, e.g., upper shift, lower shift, control shift, etc., which are designated by shift key.