| 摘要 |
PROBLEM TO BE SOLVED: To keep a normal probability of a big winning pattern even if there is cheating, and the like, by updating a value stored in a set probability storage means to one within a range that can be set by a probability setting means when the value stored in the set probability storage means and the range that can be set by the probability setting means disagree. SOLUTION: A value for probability of a big winning pattern set by a probability setting switch 45 when the power is on is stored in a set probability memory 38. Random number generation program is started up synchronously with a timing signal inputted from a RSTI terminal of a microcomputer 30 to compare the value stored in the memory 38 with an upper limit value, a median value, a lower limit value of a range that can be set by the setting switch 45. If the value stored in the memory 38 does not agree with any of the values, the median value is stored in the memory 38. If agrees, a value to be stored in the memory 38 as a final value steppe up by a mode determination counter 33 is set. Due to this structure, even if there is a runaway, or the like, a normal probability of the big winning pattern can be kept the same. |
