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:
Oct. 02, 1984
Filed:
Apr. 01, 1982
Applicant:
Inventor:
Richard A Carey, Ashland, MA (US);
Assignee:
Honeywell Information Systems Inc., Waltham, MA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 16 ; 371 20 ;
Abstract
An address bus of a central processor unit (CPU) is tested by generating repetitive 'no operation' (NO OP) instructions. A microprocessor in the CPU receives the NO OP instruction code set manually into switches and generates sequential addresses on successive CPU cycles on the address bus. The microprocessor generates a read signal during each CPU cycle which is jumpered to portions of the logic to allow continuity of operation during test.