| 摘要 |
The erroneous-operatin preventive apparatus has a unit for receiving the opertion medium. The unit includes two data modifiers and the operation medium stores a first set of data, second data equal to the first data modified by the first data modifier, and third data equal to the first data modified by the second data modifier. When the operation medium is set in the unit, the first and second modifiers modify the first data from the operation medium. The modified data is compared with the second and third data from the operation medium to decide the correctness of operation when the comparison results indicate a predetermined relationship between the modified first data with the respective second and third data.
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