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. 26, 1996
Filed:
Mar. 15, 1996
Applicant:
Inventor:
Thomas M Ogletree, Austin, TX (US);
Assignee:
Compaq Computer Corporation, Houstin, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
3951832 ; 39518316 ;
Abstract
A printer has test circuitry external to its processor to test memories used inside the printer. The test is initiated by the processor by signalling the test circuitry. The test circuitry stores a first sequence in each memory then reads the sequence from the memory and compares the memory's data to the original sequence. The test is repeated with a second sequence which is the logical inverse of the first sequence. If an error occurs, a flag is set. When the test is complete, the processor is notified. The processor can check the error flag to determine whether the test was successful.