The present invention relates to a gaming machine having mechanical spinning reels and display units mounted inside the reels that are driven between a retracted position and a forward position. The device includes an external force free position detector for detecting the tip position of the tool from a detection value thereof, a strain detector for detecting a strain of the spindle guide, and a corrector for correcting the tip position of the tool, which has been detected by the external force free position detector, with the use of a detected strain value of the strain detector. Output drivers of the memory are placed in a tri-state condition in response to a detected read error. The controller determines stall conditions of the lower pedal arm between the limits of travel based on the velocity information received during movement of the lower pedal arm to reduce injury or damage resulting from engagement with obstructions. The connection terminal received in the terminal groove has a connection portion and a contact portion adapted for connecting a mating extending downward from the connection portion.