The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 10, 1989
Filed:
Dec. 17, 1985
Banri Nakagawa, Yamato, JP;
Katsuyuki Nojima, Yokohama, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
In a CRT display system, its screen is divided into a least two partitions or viewports for displaying different data groups, and characters in one of the groups can be vertically scrolled bit by bit in one of the partitions. The partition to be scrolled is defined by line attributes assigned to successive rows of the screen. When a raster scan passes the scrolling partition, a line count output of a (scan) line counter is modified by adding a content of a smooth scroll offset register to the line count. The modified line count is used together with a character code as an address for a character generator. By gradually changing the content of the offset register, the characters are vertically shifted smoothly in the partition.