Browse Prior Art Database

Merging of Presentation Space Data And Extended Character Buffer Data By Work Station Controller Hardware

IP.com Disclosure Number: IPCOM000100711D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 85K

Publishing Venue

IBM

Related People

Dancker, GA: AUTHOR [+2]

Abstract

A method to merge extended character bit (ECB) and presentation space (PS) data by work station controller (WSC) hardware is described. This is in marked contrast to a conventional design of sending ECB data and PS data separately to a work station (W/S) or merging ECB and PS data by WSC Licensed Internal Code (LIC).

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This is the abbreviated version, containing approximately 52% of the total text.

Merging of Presentation Space Data And Extended Character Buffer Data By Work Station Controller Hardware

       A method to merge extended character bit (ECB) and
presentation space (PS) data by work station controller (WSC)
hardware is described.  This is in marked contrast to a conventional
design of sending ECB data and PS data separately to a work station
(W/S) or merging ECB and PS data by WSC Licensed Internal Code (LIC).

      Some work stations contain an ECB which controls how data are
displayed, such as reverse image, underscore, etc. The work stations
also contain a PS which contains characters to be displayed.  A
typical WSC supports multiple active W/Ss.  A single microprocessor
(MPU) is used along with a twin-ax adapter.

      For W/Ss that have an ECB and a PS, a buffer is set up
in WSC storage for each.  This is to improve the performance of
keystroke processing and to reduce the need to read the ECB or PS
from the W/S to WSC storage.  When sending data to a W/S, two or more
data transfers are required--one for each ECB and one for the PS.
Each transfer requires the following series of operations; each
operation requires some MPU utilization and some twin-ax adapter
utilization.
 1. Load address command - sets the starting point in the W/S buffer
where data are written.
 2. Write data command - notifies the W/S to prepare to receive data
for an ECB or the PS.
 3. Poll the W/S until the busy bit in the poll response goes
inactive.  The busy bit inactive means the W/S has finished
processing a command and is ready to accept the data.
 4. Write activate command im...