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:
Feb. 24, 1987
Filed:
Sep. 27, 1983
Ed C Ng, San Jose, CA (US);
Motorola Computer Systems, Inc., Cupertino, CA (US);
Abstract
In a system including a central processor, central memory, and local video controller communicating with a video terminal, the video terminal including a terminal processor and a video memory for storing video information for displaying on the terminal screen, a change detect circuit is provided in the local video controller for detecting whenever a change has occurred in that portion of the central memory containing video information to be displayed on the terminal's video screen. Responsive to the change detect circuit, the local video controller sends updated video information to the video memory at the terminal. The change detect circuit reduces the workload on the system by sending only the updated video information to the terminal. The change detect circuit is capable of operation with a system employing multiple terminals each having multiple independent screen display areas.