Abstract: A television-type system for displaying characters of an alpha-numeric test n a horizontal line moving across the face of a TV monitor includes pulse-generator-fed frequency dividers emitting pulse sequences of which three are transmitted via viewer-operated selectors for forming two frequencies f.sub.L and f.sub.Z applied to shift registers of a character generator to determine character height and width and another frequency f.sub.G applied to the stepping input of a delay-increment counter to determine character speed. In response to character codes transmitted from an input unit via a read/write memory, the character generator emits binary signals combinable with horizontal and vertical sync pulses into a video signal fed to the monitor. The counter is reset upon every horizontal sync pulse to have a modulus n equal to the contents of a total-delay counter stepped by the vertical sync pulses and reset after N of the same by a divder calculating the quotient N=T.sub.Z /T.sub.