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:
Jan. 04, 1977
Filed:
Dec. 20, 1974
Angelo Bardotti, Cesano Boscone (Milan), IT;
Honeywell Information Systems Italia, Milan, IT;
Abstract
In a data processing system having a plurality of input/output channels, a first plurality of physical resources is dedicated to each of the channels. Said first plurality is sufficient only to enable standard data character exchanges between each of the channels and the central processing unit in a time-sharing manner. A second plurality of physical resources (including registers and logic) is provided which is dedicated to a corresponding plurality of service classes. The service classes are ordered according to a priority criterion and selectively assigned to different channels in accordance with the priority level of the interrupt which has requested the service. In this manner, while services of the same class are not reciprocally interruptible, services of different classes on different channels are hierarchically interruptible.