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Field-Controlled Character Graphics for Display Station

IP.com Disclosure Number: IPCOM000063904D
Original Publication Date: 1985-May-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Regehr, JL Shepherd, BJ [+details]

Abstract

This field-controlled character graphics design provides a low-cost method of presenting character graphics on a display station with a full set of fixed graphic symbols, and display is accomplished without special host system support beyond the application program. A set of fixed graphic symbols is stored in an extended page space of the display station's character generator ROS (read-only store). The page control or "mode control" of this two-part character generator is accomplished by shift-in or shift-out field-attribute control characters. The control characters are supported by the standard system data stream, resulting in host system support without change to the interface protocol.