Browse Prior Art Database

Screen Scrolling

IP.com Disclosure Number: IPCOM000048290D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Adam, TL: AUTHOR [+6]

Abstract

Both cursor position and a selected one of available cursor motion control keys determine the effect of vertical scrolling in a keyboard/ display word processing system.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 72% of the total text.

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Screen Scrolling

Both cursor position and a selected one of available cursor motion control keys determine the effect of vertical scrolling in a keyboard/ display word processing system.

Scrolling down information displayed on the viewport is accomplished by first positioning the cursor on the last line of the viewport. Then, the insertion of a carrier return by depressing a return key, or a carriage return via an auto carrier return, or depression of a "cursor down" key scrolls the viewport down by one line. Likewise, if the cursor is positioned on the first line of the viewport, depressing a "cursor up" key scrolls the viewport up by one line. In either case, if the last character or the first character is not on the display, depressing the "boundary down" or "boundary up" key will scroll the viewport in the desired direction until either the last character of the page appears on the bottom line or the first character appears on the top line of the display. When scrolling down, if the page contains fewer lines then the viewport, the first line of the page will be displayed on the first line of the viewport and the cursor will be positioned on the last character of the page which normally will be a "page end" code. When scrolling up, the cursor will be positioned on the first character of the page on the top line of the viewport.

If the cursor is moved down past the page end code of a page while scrolling down, the system stores the page and reads the next page....