an electronic recording and display apparatus for performing the function of a chart recorder comprises a solid state display device controlled from a memory by a display controller . the memory receives signals in the form of 8 - bit binary number digitized by a signal digitizer from an analogue input signal . the display device graphically displays a set of the signals stored in the memory and this can be &# 34 ; scrolled &# 34 ; through all the information stored in the memory in a manner similar to a chart recorder .