| 摘要 |
PROBLEM TO BE SOLVED: To present an effective index of operation rate. SOLUTION: A counter circuit 1930 counts counter values which correspond to the period during which operation symbol change signals are at a high level. A counter circuit 1940 counts counter values which correspond to the period during which operation signals are at a high level. The counter values are subtracted by a subtraction circuit 1950 so that the ratio of the period during which symbols are changing during operation period to all the operation period is presented as an index indicating the operation rate of a game machine.
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