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:
Dec. 21, 1982
Filed:
May. 06, 1980
James A Katzman, San Jose, CA (US);
Joel F Bartlett, Palo Alto, CA (US);
Richard M Bixler, Sunnyvale, CA (US);
William H Davidow, Atherton, CA (US);
John A Despotakis, Pleasanton, CA (US);
Peter J Graziano, Los Atlos, CA (US);
Michael D Green, Los Atlos, CA (US);
David A Greig, Cupertino, CA (US);
Steven J Hayashi, Cupertino, CA (US);
David R Mackie, Ben Lomond, CA (US);
Dennis L McEvoy, Scotts Valley, CA (US);
James G Treybig, Sunnyvale, CA (US);
Steven W Wierenga, Sunnyvale, CA (US);
Tandem Computers Incorporated, Cupertino, CA (US);
Abstract
A multiprocessor system the kind in which two or more separate processor modules are interconnected for parallel processing includes two redundant interprocessor buses dedicated exclusively to interprocessor communication. Any processor module may send information to any other processor module by either bus. The multiprocessor system includes a memory system in which the memory of each processor module is divided into four logical address areas--user data, system data, user code and system code. The memory system includes a map which translates logical addresses to physical addresses and which coacts with the multiprocessor system to bring pages from secondary memory into primary main memory as required to implement a virtual memory system. The map also provides a protection function. It provides inherent protection among users in a multiprogramming environment, isolates programs from data and protects system programs from the actions of user programs. The map also provides a reference history information for each logical page as an aid to efficient memory management by the operating system.