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. 29, 1981
Filed:
Jan. 31, 1979
Robert C Miller, Braintree, MA (US);
John J Bradley, Framingham, MA (US);
Richard L King, Hollis, NH (US);
Ming T Miu, Chelmsford, MA (US);
Jian-Kuo Shen, Watertown, MA (US);
Theodore R Staplin, Jr, Chelmsford, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
In a data processing system which includes one or more common buses to which a plurality of input/output controllers are connected for the transfer of data, blocks of data may be transferred between main memory and an input/output controller (IOC) synchronously with operation of the central processor unit (CPU). Logic is provided for enabling one unit of data to be transferred during a Data Multiplex Control (DMC) data transfer operation in which the requesting IOC requests a DMC data transfer of the CPU and later provides the CPU with a channel number assigned to the requesting IOC. Means are provided within the system for: resolvng conflicting requests for the one or more common buses, the CPU to acknowledge the DMC request, identifying the requesting IOC to the CPU, accessing one unit of data from main memory or the IOC, and transferring the unit of data to the IOC or main memory.