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. 23, 1976
Filed:
Jun. 30, 1975
Frank V Cassarino, Jr, Weston, MA (US);
George J Barlow, Tewksbury, MA (US);
George J Bekampis, Sudbury, MA (US);
John W Conway, Waltham, MA (US);
Richard A Lemay, Bolton, MA (US);
David B O'Keefe, Tyngsboro, MA (US);
Douglas L Riikonen, Westford, MA (US);
William E Woods, Natwick, MA (US);
Honeywell Information Systems, Inc., Waltham, MA (US);
Abstract
In a data processing system having a plurality of units coupled for the transfer of information therebetween over a common electrical bus during asynchronously generated information bus transfer cycles, the units are coupled in a priority network and depending upon their respective priority may gain access to the bus before a lower priority unit is so enabled. Each one of the units includes apparatus for responding to a request for the transfer of information from another unit by providing any one of up to three signal responses including a positive acknowledge signal indicating an immediate response, a negative acknowledge signal indicating that the unit will most likely be busy for a relatively extended period of time and a quasi-negative response indicating that the unit will probably be ready during the next asynchronously generated bus transfer cycle.