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:
Apr. 29, 1986
Filed:
Jul. 05, 1983
Applicant:
Inventors:
Thomas L Murray, Jr, Merrimack, NH (US);
Kin C Yu, Burlington, MA (US);
Thomas O Holtey, Newton, MA (US);
Assignee:
Honeywell Information Systems Inc., Waltham, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; H04N / ;
U.S. Cl.
CPC ...
364200 ; 358148 ;
Abstract
A data processing system includes a cathode ray tube (CRT) display. Apparatus associated with the CRT tests and verifies the vertical and horizontal synchronization and the logic associated with a character generator. Refresh signals, horizontal synchronization signals and data bit signals from the character generator are counted. The counts of those signals which occur within a predetermined number of occurrences of vertical synchronization signals are verified.