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. 28, 1980
Filed:
Oct. 31, 1978
Bruce H Tarbox, Billerica, MA (US);
Kenneth E Bruce, Nashua, NH (US);
John W Conway, Waltham, MA (US);
Ralph M Lombardo, Jr, Lowell, MA (US);
Honeywell Information Systems, Inc., Waltham, MA (US);
Abstract
A logic system in an intersystem link (ISL) unit is provided for avoiding deadlock conditions which may occur in a data processing system wherein multiple CPUs on one communication bus attempt to communicate with resources on remote communication busses. The data processing system has plural communication busses, each providing a common information path to plural data processing units including memory units, peripheral control units, central processing units (CPUs) and ISL units, and each of the plural communication busses are in electrical communication with an ISL unit, and ISL units are electrically connected in pairs.