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:
Nov. 01, 1994
Filed:
Feb. 28, 1994
Applicant:
Inventors:
Dennis A Cummins, Raleigh, NC (US);
Wayne R Hucaby, Raleigh, NC (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395800 ; 395275 ; 364D / ; 364234 ; 364228 ; 3642383 ;
Abstract
A controller and communications architecture for controlling the operation of computer I/O devices such as a keyboard or the like includes two microprocessors, a three-wire half duplex communications interface and a transmission protocol allow data transmission, error, detection and contention resolution. The transmission protocol allows the microprocessors to transmit serial data over the interface which includes a single shared data line and two simplex clock lines.