Singular points of the orthogonal separable coordinates in the hyperbolic plane

A visual display system including a display unit for simultaneously displaying the individual characters of a word unit. A selector switch is operative to select any one of a plurality of messages, each message consisting of one or more word units which are separately stored in the memory locations of a memory bank. Logic means responsive to the selector switch sequentially activates individual ones of the memory locations in accordance with the selected message. Finally, a character generator receives the output of the memory bank and activates the display unit, a character at a time, until the entire word unit appears, whereupon the memory bank signals the logic means to activate the next memory location in accordance with the selected message.