This is off topic, but A fascinating thing about these planes is the control surfaces are aero powered through tab surfaces. They hang and move freely when the plane is stopped and only become controllable after the plane starts rolling down the runway.
To give a simplified explanation, a small tab located at the trailing edge of the surface is deflected by the control linkage. The deflection of the tab generates an aerodynamic force which then creates a moment around the control surface hinge, moving the entire surface.
So if you deflect the tab upwards, that air flow over the tab generates a downwards force that acts to move the control surface down.
Usually the connection between pilot intent and wing movement is:
Pilot moves the stick->Aileron moves, changing lift on the wing->wing moves
In the MD-80:
Pilot moves the stick->Tab moves, changing lift on the aileron->aileron moves, changing lift on the wing->wing moves