def _frame_advance(self, action):
        """
        Advance a frame in the emulator with an action.

        Args:
            action (byte): the action to press on the joy-pad

        Returns:
            None

        """
        # set the action on the controller
        self.controllers[0][:] = action
        # perform a step on the emulator
        _LIB.Step(self._env)