| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine which facilitates the easier discovery of the fraudulence while curtailing the number of signal lines. SOLUTION: The transmission of signals is carried out between the main board 10 and the subboard 20 by the I<SP>2</SP>C bus system. The main board 10 and the subboard 20 are provided with a bidirectional bus buffer 110 individually. The bidirectional bus buffers 110 branch off the two bidirectional serial lines (SDA and SCL) making up the I<SP>2</SP>C bus off respectively to two one-way serial lines each. The connection is made between the bidirectional bus buffer 110 provided on the main board 10 and the bidirectional bus buffer 110 provided on the subboard 20 with four serial wires, through which the signals are transmitted in the respective directions to match each other between the one-way serial lines branched off respectively. Thus, the main board 10 and the subboard 20 are connected with the four serial wires. COPYRIGHT: (C)2006,JPO&NCIPI
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