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. 13, 1984
Filed:
Jul. 18, 1983
Kin C Yu, Burlington, MA (US);
Gary J Goss, Acton, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
A data processing system includes a central processing unit, a main memory, and a communication subsystem servicing a number of communication lines. The communication subsystem includes a free running timer, a line microprocessor for communicating with the communication lines and a shared memory, and an I/O microprocessor for communicating with the shared memory and the central processing unit and main memory. The line microprocessor, desiring to communicate with a specified communication line after a predetermined time delay, loads a first mailbox in shared memory with a binary number indicative of the predetermined time delay. The I/O microprocessor adds the output of the free running timer to the binary number, stores the result in a location in a random access memory, and periodically compares the result against the free running timer output. The I/O microprocessor loads a second mailbox with a control character when the results of the comparison indicate that the predetermined time delay is accomplished. The line microprocessor responds to the information in the second mailbox to communicate with the specified communication line.