         enigmaMachine.keyDown(aLetter: aLetter)
         if let outputLetter = enigmaMachine.litLamp
         {
-            printerController.displayLetter(letter: outputLetter)
+            printerController.display(letter: outputLetter)
         }
     }
 


    func connectLetterPair(letterPair: (Letter, Letter), plugboardView: PlugboardView)
    {
        enigmaMachine.plugInPair(pair: letterPair)
    }

    func connectionForLetter(letter: Letter, plugboardView: PlugboardView) -> Letter?

                {
                    rotorBoxDataSource.insertRotor(newRotor: removedRotor)
                }
                enigmaMachine.insert(rotor: rotorBeingDragged, inSlot: ringIndex, position: Letter.A)
                self.rotorBeingDragged = nil
            }
            ret = true
