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. 15, 1980
Filed:
Oct. 23, 1978
Mark F Diez, Rochester, MN (US);
David O Lewis, Rochester, MN (US);
Thomas S Robinson, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A monitor circuit for overseeing input/output activity in a digital computing system is disclosed. The circuit comprises a memory array for storing subchannel status words, each of which corresponds to an input/output operation unit. Each subchannel status word includes a timing monitor field having a current count subfield, a count limit subfield, and a command-in-progress bit position. Circuits are provided for incrementing at timed intervals numbers encoded in the current count subfields of those subchannel status words against which a request for an input/output operation is outstanding. A circuit is provided for comparing the numbers encoded in the current count subfields to the count limit subfields to determine if a response to a request for an input/output operation is overdue.