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. 24, 1981
Filed:
Nov. 02, 1979
Vittorio Zanchi, Milan, IT;
Tiziano Maccianti, Pregnana Milanese, IT;
Honeywell Information Systems Italia, Milan, IT;
Abstract
An interrupt handling apparatus for a data processing system comprising a plurality of processing units and a working memory to which the units may access through a common bus by means of multilevel priority or access requests. Access requests are forwarded by each unit to a bus access controller preferably made part of the working memory through a single lead for each unit, irrespective of the access request priority level; and if the priority level of an access request is high, a high priority level access request signal is distributed by the high priority level interrupting unit to the other system units, which mask their possible access request of a lower priority level in response to such signal. The bus access controller grants access to a unit at a time on a priority basis determined by a priority network in the controller totally insensitive to any priority level difference of the access requests.