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:
Oct. 06, 1981
Filed:
Jan. 31, 1979
John J Bradley, Framingham, MA (US);
Thomas O Holtey, Newton Lower Falls, MA (US);
Robert C Miller, Braintree, MA (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 processing unit (CPU). Logic is provided for enabling one unit of data to be transferred during a Direct Memory Access (DMA) data transfer operation in which the requesting IOC requests a DMA data transfer of the CPU. Means are provided within the system for: resolving conflicting requests for the one or more common buses, the CPU to acknowledge the DMA request, the IOC to transfer the address of the location where the unit of data is to be written into main memory followed by the unit of data, or the IOC to transfer the address of the location in main memory from which the unit of data is to be read and then receive the unit of data read from main memory.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile