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. 11, 1983
Filed:
Apr. 25, 1980
Steven Wallach, Framingham, MA (US);
Kenneth D Holberger, North Grafton, MA (US);
David L Keating, Natick, MA (US);
Steven M Staudaher, Northboro, MA (US);
Data General Corporation, Westboro, MA (US);
Abstract
A data processing system handles thirty-two bit logical addresses which can be derived from either sixteen bit logical addresses or thirty-two bit logical addresses. The system uses hierarchical memory storage using in a particular embodiment eight storage segments (rings), access to the rings being controlled in a privileged manner according to different levels of privilege. The segment locations are designated by successive segment numbers having a descending order of protection with reference to data accesses thereto. A current address for data access includes a segment identification and a comparison is made with the segment identification of a preceding address to determine whether access can be made by the current address.