Radar return signals are digitized and the resultant bits entered serially into an input buffer in the form of a storage register. The bits are integrated on a bit-by-bit basis and then entered into the main memory in the form of a circulating storage register. The information stored in the main memory is subsequently recalled and conveyed through an output buffer for display on a cathode ray tube. The rate at which the bits of each word are entered into the input buffer determines the display range. In addition, the rate at which bits are entered into the input buffer may differ from the rate at which bits are displayed on the cathode ray tube.