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:
Sep. 27, 1977
Filed:
Apr. 27, 1976
Applicant:
Inventors:
Masahiro Hashimoto, Sagamihara, JA;
Kenichi Furumaya, Hadano, JA;
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ; G06F / ;
U.S. Cl.
CPC ...
364900 ; 3401 / ; 235312 ;
Abstract
In a memory hierarchy system comprising a main memory for storing data and a buffer memory for holding a part of the data stored in the main memory as a copy of the main memory data, the data on the buffer memory is frequently replaced by the data on the main memory so as to hold in the buffer memory the data which is very frequently used. The buffer memory also holds the data which is in an area of the main memory where an irremediable fault occurred and that data is prevented from being replaced. Therefore, the buffer memory is substituted for the fault area of the main memory so that a fail soft system is attained.