document.addEventListener('keydown', keyDown);
        document.addEventListener('keyup', keyUp);

        var mapping = {
            'KeyQ': [0x15],
            'KeyW': [0x1d],
            'KeyE': [0x24],
            'KeyR': [0x2d],
            'KeyT': [0x2c],
            'KeyY': [0x35],
            'KeyU': [0x3c],
            'KeyI': [0x43],
            'KeyO': [0x44],
            'KeyP': [0x4d],
            'KeyA': [0x1c],
            'KeyS': [0x1b],
            'KeyD': [0x23],
            'KeyF': [0x2b