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. 26, 1982
Filed:
Dec. 28, 1979
Applicant:
Inventor:
Jan G Oblonsky, Brookeville, MD (US);
Assignee:
International Business Machines Corp., Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
370 85 ; 370 95 ; 364200 ;
Abstract
A new polling apparatus for units on a shared bus of a data processing system operates with a relatively slow multi signal line request bus and a relatively slow local counter. The local counter divides each time slot into a few sub-slots. Each sub-slot is assigned to two or more units in a priority sequence and during a sub-slot the assigned units contend for access to the bus by raising signals on particular lines of the request bus according to their priority within the sub-slot.