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:
Aug. 20, 1991
Filed:
Jul. 06, 1988
Applicant:
Inventors:
Steve L Belt, St. Joseph, MI (US);
Robert A Kohtz, St. Joseph, MI (US);
Assignee:
Zenith Data Systems Corporation, Buffalo Grove, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364900 ; 3649705 ;
Abstract
An improved means and method for expanded memory system access and control is disclosed. A logic array in the expanded memory control circuitry which accesses and controls up to two separate expansion boards through the use of static random access memory as register circuits and octal buffers for addressing. The control and access method implemented through a state machine in the logic array provides the operation of the improved expanded memory system to control additional expansion boards and to access the appropriate memory locations.