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:
Mar. 18, 2003
Filed:
Jun. 15, 2000
Yuchuan Chang, Taipei, TW;
Kuang Shin Lin, Taipei, TW;
Xue Ning Ren, Tien Chin, CN;
Cheng Long Hu, Tien Chin, CN;
Inventec Corporation, , TW;
Abstract
A method of detecting short-circuits of a keyboard is provided. The method includes the steps of establishing a database of standard scanned codes and a keyboard matrix that corresponds to keys of a keyboard in the memory device of a computer mainframe and then predefining a set of 25 keys of the keyboard for detection purpose. When a tester presses one of the predefined keys, in the keyboard matrix a row of data line and a column of data line will connect with each other, allowing a keyboard controller to receive a signal variation responsive to the pressed key and then to produce a scanned code responding to the pressed key. After that, the scanned code is transmitted into the buffer of computer mainframe, triggering an interrupt IRQ1 in computer hardware. By executing a comparison program in the memory device of the computer mainframe, the computer mainframe compares the transmitted scanned code in the buffer with the data in the database stored in the memory device. As a result, whether the keys of the keyboard are short-circuited or not can be determined.