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:
Sep. 23, 1980
Filed:
Oct. 23, 1978
David O Lewis, Rochester, MN (US);
John W Reed, Pine Island, MN (US);
Gary W Wallin, Mantorville, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In a computer system having: an addressable storage for storing instructions, data and input-output (I/O) commands; a central processing unit (CPU) which fetches and executes instructions; and channel means connecting I/O adapters to the storage and the CPU, an apparatus transfers I/O commands to the I/O adapters whereby the I/O command is either accepted immediately or is queued by the I/O adapter. A queued command is taken up by the I/O adapter when no other data transfer operation is pending. To take up a queued command, the I/O adapter initiates a fetch of the pending command by invoking a standard data-transfer-from-storage sequence. The channel means responds to the fetch initiated by the I/O adapter to send the pending command to the I/O adapter.