Browse Prior Art Database

Display Performance Improvement

IP.com Disclosure Number: IPCOM000037124D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Pelt, AB: AUTHOR

Abstract

Disclosed is a programming concept which improves the performance for a display service.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

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Display Performance Improvement

Disclosed is a programming concept which improves the performance for a display service.

For improved performance during IBM 3101 and Digital VT100 terminal emulation, bits were set and tested at various points to determine when none, part or all of the display was to be updated. Based on tests, code was not executed which was not necessary. Several display conditions were focussed on to set these bits: 1) Display Initialization - Bits set so entire display would be updated initially. 2) Cursor Movement - Bits set so new cursor position would get updated on display and only code involved would be

executed. 3) No Change To Display - Bits set so display would not be updated and code involved would not be executed. In most

cases, after display gets updated, the "no change" value is

assigned to bits. 4) Partial Display Updates - Any change in minimum/maximum variables cause bits to be set. 5) Full Screen Updates - Bits set when functions cause entire display to be updated.

Significant performance improvements are realized using this philosophy. Two bits were used to achieve this goal and several variables assisted.

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