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. 21, 1978
Filed:
Feb. 17, 1977
David Cronshaw, Torrance, CA (US);
James R Keddy, Huntington Beach, CA (US);
Jack E Shemer, Los Angeles, CA (US);
William D Turner, San Marino, CA (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A mapping arrangement for memory overlay wherein the address coordinates are referenced to a main serial memory. This main memory is partitioned into pages of equal size. An accelerator memory is concurrently loaded with a few pages representing a small portion of the main memory contents and is periodically overlayed with new memory contents on a page-at-a-time basis as the using system demands. During this overlay the fields of the accelerator memory are inscribed at corresponding main memory address coordinates together with code bits indicating whether certain memory fields go together and are therefore promoted as a single unit. The resulting effect is to cause an apparent increase in page size since more than one page is promoted as a consequence of a reference to a page not contained in the accelerator memory.