| 摘要 |
PURPOSE:To improve the reliability of information by duplexing a memory. CONSTITUTION:At the time of writing information, an interface part 1 receives an instruction of write, information and a storing position from an IC card reader/writer, and delivers them to a CPU 2. The CPU 2 writes the information in a memory 4, and also, writes this information in the same storing position as that of the memory 4, in a memory 5, as well. At the time of reading information, the interface part 1 receives an instruction of read from the IC card reader/ writer, and informs it to the CPU 2. The CPU 2 reads the information which has been stored in the same store positions of the memory 4 and the memory 5, and compares both of them. When they are equal, read information is outputted to the IC card reader/writer through the interface part 1. When they are not equal, error information is informed to the interface part 1. |
