Program modification system in an electronic cash register

Details Program modification system in an electronic cash register Program modification system in an electronic cash register

G - Physics

06

F

354/230.74

G06F 9/22 (2006.01) G06F 9/26 (2006.01) G06F 9/445 (2006.01) G06F 12/02 (2006.01) G07G 1/12 (2006.01)

Patent

CA 1200610

ABSTRACT OF THE DISCLOSURE An electronic cash register or other apparatus includes a mask ROM for memorizing a fixed operation pro- gram. A first RAM stores information indicating an ad- dress of the mask ROM of which the program should be modi- fied. A second RAM stores a modified program. A third RAM stores an address table indicating the address of the mask ROM of which address the program should be modified, and indicates an address of the second RAM at which the modified program is stored. A control system performs an operation in accordance with the operation program mem- orized in the mask ROM with reference to the first RAM. When the first RAM indicates the modification, the opera- tion is conducted in accordance with the modified program information stored in the second and third RAMs.

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