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:
Sep. 26, 1995
Filed:
Mar. 02, 1995
Tomonari Sagane, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
An electronic apparatus for allowing firmware contained therein to be corrected externally at a mass production stage. Correction data with which to correct an internal ROM content are held in an external storage. The correction data are placed by a program residing in the ROM into a register and a RAM. A comparator compares an execution address on the address bus with a correction address in the register. In case of a match between the two addresses, the CPU is interrupted to execute the correction content placed in the RAM, the correction content taking the place of the data portion to be corrected in the ROM. If an update command is entered from the outside to update the content of the external storage, the storing of the correction data into the register and the RAM is inhibited.
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