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:
Nov. 10, 1981
Filed:
Jan. 31, 1979
John J Bradley, Framingham, 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 information, blocks of information may be transferred between main memory and an input/output controller (IOC) synchronously with operations of the central processor unit (CPU). Logic is provided for enabling one unit of the block of information 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 provides the CPU with a channel number assigned to the requesting IOC. Means are provided within the CPU for determining: the direction of the data transfer, the address of the location of the unit of data to be transferred to/from the main memory, and the number of units of data remaining to be transferred between the main memory and the IOC.