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:
Aug. 18, 1987
Filed:
Apr. 22, 1983
Akira Mitarai, Yamatokoriyama, JP;
Kunio Kubota, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An electronic cash register includes a mask ROM for memorizing a fixed operation program. First through third RAM's are provided for storing information for partly modifying the operation program memorized in the mask ROM. The first RAM stores information which indicates an address of the mask ROM at which the program should be modified. The second RAM stores a modified program. The third RAM stores an address table which correlates the address of the mask ROM at which the address should be modified, and the addresses of the second RAM at which the modified program is stored. A control system performs an operation in accordance with the operation program memorized in the the mask ROM with reference to the first RAM. When the first RAM indicates the modification, the operation is conducted in accordance with the modified program information and associated address table stored in the second and third RAM's.