Abstract: A seven character segment display assembly with each assembly including a rotatable drum carrying a character display adapted to be viewed at a window of a stationary mask. The drum includes a permanent magnet which is adapted to be attracted by the poles of a stationary wire coil wound as a bifilar center tapped winding on a core. The control circuit provides a D. C. voltage to the center tap of the coil. The circuit includes first and second invertors having outputs connected to the opposite ends of the coil. The output of the first invertor is connected to the input of the second invertor. A decoder generating logic signal pulses has an output connected to the input of the first invertor.