拔河游戏机需要9个发光二极管排成一行，开机后只有中间一个亮点，以此作为拔河的中间线，游戏双方各持一个按键，迅速、不断地按动产生脉冲，哪方按得快，亮点就向哪方移动，每按一次，亮点移动一次。移到任一方二极管的终端，该方获胜，此时双方按键均无作用，输出保持，只有经复位后才能使亮点恢复到中心线。-Tug of War game 9 LEDs need to line up, the boot after only a bright spot in the middle as the middle line a tug of war, games, and each party holds a key to quickly and continuously press the generate pulse, which side by fast, bright to which side to move, each time, highlight moving again. Move to either diode terminal, the party won, this time there was no key role in both the output remains the only bright spot by only after you reset back to the center line.