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. 20, 1990
Filed:
Aug. 04, 1989
Joseph P Buonomo, Endicott, NY (US);
Robert W Callahan, Endwell, NY (US);
Steven R Houghtalen, Endicott, NY (US);
Sivarama K Kodukula, Binghamton, NY (US);
Raymond E Losinger, Endicott, NY (US);
Brion N Shimamoto, Greenwich, CT (US);
Harry L Tredennick, San Jose, CA (US);
James W Valashinas, Endicott, NY (US);
International Business Machines Corp., Armonk, NY (US);
Abstract
A microprocessor chip which is capable of executing a specific subset of instructions on behalf of the main storage portion of a computer memory can be made to emulate direct execution instructions not in that specific subset while working on behalf a control storage portion of the computer memory in a manner which is transparent to the main storage portion by means of a novel set of operand space selection instructions in the control storage portion and a novel switching circuit on the microprocessor chip which controls the access of the chip to the control store portion and the main store portion.