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:
Apr. 10, 1990
Filed:
Mar. 18, 1985
Robert P Ryan, Marlborough, MA (US);
Kin L Cheung, North Andover, MA (US);
Wang Labortatories, Inc., Lowell, MA (US);
Abstract
A distributed reference and change table 36 for a virtual memory system 10 has a number of storage locations at least equal to the maximum number of data blocks of an associated read/write physical memory. A memory module 24 has a plurality of data words organized into n number of data blocks. The memory module includes an integral reference and change table having at least n storage locations each having at least two bits, one bit indicating the occurrence of an access (reference) to a corresponding data block and the other bit indicating if the access was a write (or change) type of access. A plurality of such memory modules are physically and electrically coupled to a common memory carrier module, each of the plurality of memory modules having an integral reference and change table.