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:
Jul. 26, 1977
Filed:
Apr. 30, 1976
Max Abbott Bouknecht, Boca Raton, FL (US);
Donall Garraid Bourke, Boca Raton, FL (US);
Louis Peter Vergari, Palm Springs, FL (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Common logic in a peripheral device control unit responds to a serially propagated poll signal from I/O control logic, or channel, along with a coded signal identifying either a poll for a cycle steal request or a poll for an interrupt request having one of several priorities. The poll signal received will be captured or propagated to following control units dependent upon whether the control unit has requested a cycle steal transfer, or has requested an interrupt at the priority level indicated by the coded signal accompanying the poll signal. Proper functioning of poll capture or propagation is possible even though one of the control units is physically removed from the serial chain of control units.