Gaming machine and method of detecting fraud in the same

A gaming machine which, in response to a first external operation, becomes enabled to execute a game, and in which said game is executed while said machine is enabled to execute said game so as to determine a reward, comprising:

• a controller for executing said game;
• first signal generator means connected to said controller via a signal line for generating a first signal representing a game-enabled state in response to said first external operation;
• second signal generator means connected to said controller via a signal line for generating a second signal in response to a second external operation performed before determination of said reward;
• and
• test signal generator means for outputting a test signal to said signal line of a selected one of said first and second signal generator means, said controller checking said signal line of the remaining one of said first and second signal generator means during generation of said test signal and, if said test signal is detected through said signal line of said remaining one signal generator means, inhibiting payment of said reward, detection of said test signal indicating fraudulent operation of said gaming machine;
• said test signal generator means and said gaming machine receiving power from a common power supply.

A method of detecting fraudulent operation in a gaming machine by a test signal generating means, said gaming machine and said test signal generating means receiving power from a common power supply;

• wherein, a first signal enabling execution of a game is input upon a first external operation to a controller through a first signal line, a second signal is input upon a second external operation to said controller through a second signal line, and thereafter a reward for said game is determined, said method comprising the steps of:
• outputting a test signal to said second signal line;
• checking said first signal line;
• and
• if said test signal is detected through said first signal line, inhibiting payment of said reward, detection of said test signal indicating said fraudulent operation.

A method of detecting fraudulent operation in a gaming machine by a test signal generating means, said gaming machine and said test signal generating means receiving power from a common power supply;

• wherein, a first signal enabling execution of a game is input upon a first external operation to a controller through a first signal line, a second signal is input upon a second external operation to said controller through a second signal line, and thereafter a reward for said game is determined, said method comprising the steps of:
• outputting a test signal to said first signal line;
• checking said second signal line;
• and
• if said test signal is detected through said second signal line, inhibiting payment of said reward, detection of said test signal indicating said fraudulent operation.