| 摘要 |
PROBLEM TO BE SOLVED: To make data control by an illegally copied memory difficult by replacing the data of the memory with the different data in a data replacement circuit. SOLUTION: By the instruction of software starting from a switch connected to an I/O 27, the data of a CD-ROM 11 are read by a reader 23 on the side of a game machine 20 and the read data of the CD-ROM 11 are loaded to the RAM 26 of the game machine 20. At the time of executing a program loaded to the RAM 26, a CPU 24 outputs an address A on an address bus 21, specifies the data replacement circuit 12 and inputs the data DI from the RAM 26 to the data replacement circuit 12. When the data DI satisfying an address access order registered beforehand are inputted, the data replacement circuit 12 replaces the data DI with the different data DO and outputs them and thus, a normal operation is continued. In this case, as long as the replacing method of the data is not completely imitated, correct replacement is not performed. |
