Browse Prior Art Database

Method to Prevent Automatic Hardware Scrolling on a Display Terminal

IP.com Disclosure Number: IPCOM000038732D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Baumgartner, DM: AUTHOR

Abstract

Many applications which depend on a constant display to the user find it undesirable when a character is placed in the bottom right-hand corner of a terminal screen, for the terminal to scroll - displacing the rest of the screen. In accordance with the new method, this is avoided by the following steps: 1. When a character is added to the presentation plane, a check is made to insure that it will not be marked for refresh if it will cause an illegal scroll. 2. During the refresh process, if a character is in a location which, if refreshed, would cause an illegal scroll, then ignore the character until such time as it is no longer illegal to scroll.

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Method to Prevent Automatic Hardware Scrolling on a Display Terminal

Many applications which depend on a constant display to the user find it undesirable when a character is placed in the bottom right-hand corner of a terminal screen, for the terminal to scroll - displacing the rest of the screen. In accordance with the new method, this is avoided by the following steps: 1. When a character is added to the presentation

plane, a check is made to insure that it will not

be marked for refresh if it will cause an illegal

scroll.

2. During the refresh process, if a character is in a

location which, if refreshed, would cause an

illegal scroll, then ignore the character until

such time as it is no longer illegal to scroll.

1