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:
Jun. 14, 1988
Filed:
Sep. 16, 1986
Joaquin Picon, St. Laurent du Var, FR;
Clement Y Poiraud, Cagnes sur Mer, FR;
Daniel Sazbon-Natansohn, Villeneuve Loubet, FR;
International Business Machines Corp., Armonk, NY (US);
Abstract
A method for storing the control code of a processor in a read only memory ROM (5) and in a read/write memory RAM (7) comprising a code area and a patch area. It consists in virtually dividing the control code in blocks of n instructions, storing the first instruction of each block into the code area of the read/write memory, and storing the n-1 following instructions of each block in the read only memory ROM. When an error is detected in at least one block, the first instruction of said block normally stored in the read/write RAM, is replaced by a branch instruction containing a branch address value so as to point to the patch area where the corrected block is stored. This method is implemented using a specific addressing circuit.