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:
Jul. 12, 1983
Filed:
May. 20, 1980
Applicant:
Inventor:
John Lewis, Tigard, OR (US);
Assignee:
Tektronix, Inc., Beaverton, OR (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364200 ;
Abstract
A circuit for enhancing the performance of a random-access-memory-based memory expansion system is disclosed. Memory capacity and a control register are added to the traditional memory mapping circuit. The increased memory is utilized to store several maps simultaneously and the circuit output is then switched from one stored map to another according to data present at the control register outputs. Thus, by pre-loading the circuit with all the memory maps required by a particular program, delay caused by map changes is reduced to the time required to move data to the control register outputs.