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. 16, 1990
Filed:
Dec. 21, 1988
Applicant:
Inventors:
Joao B De Azevedo, Jr, Endicott, NY (US);
Peter N James, Algonquin, IL (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
364200 ; 371 201 ; 3642419 ; 364267 ;
Abstract
Provision is made for conducting an I/O channel diagnostic test by using a first I/O channel in a test mode to provide a sequence of test signals to a second I/O channel. The second I/O channel responds to the test sequence by producing a series of data transfer protocol signals which are conducted to the first channel. In the first channel, the series of data transfer protocol signals are used to check operation of the second channel.