Abstract: Apparatus for storing, retrieving and replacing information contained within discrete magnetic tape information bearing cartridges comprising a storage area for storing a plurality of said cartridges each having a predetermined and designated location in the storage area; at least one processing station for extracting information from individual cartridges; computer memory means for storing a play schedule for sequential movement of said cartridges through said processing station; mechanical selection means operatively connected to said computer memory means operable in response to signals received therefrom to retrieve an individual cartridge and transferring it to the processing station and for returning same to its designated location in the storage area; servo motor means driving said mechanical selection means, said servo motor means being driven by power transmitted to it as a result of said computer signals; current feed back loop interconnecting said servo motor output and said computer output whereby