Pushbutton decoder and printer

摘要

Apparatus for sequentially printing characters along a ribbon or paper tape in response to receiving a sequence of touch tone signals. The apparatus comprises a touch tone decoder and a printer. Included in the touch tone decoder is a dual tone multiple frequency analyzing circuit which receives the touch tone signals and transmits therefrom BCD signals and control logic signals. A select function control circuit is responsive to the BCD signals and the control logic signals to select an ROM memory from a group of ROM memories. A select letter control circuit receives the BCD signals and the control logic signals and addresses the selected ROM memory to produce a parallel multiplex output signal for controlling the operation either of a matrix or a line print head of the printer. Included in the printer is a motor circuit and a control circuit to advance the ribbon or paper tape past the matrix or the line print head. Signals from the touch tone decoder operate the step motor control circuit for controlling the operation of the motor circuit. The matrix or line print head receives the output signal from the selected ROM memory and is operative to print a character or several successive lines or columns of dots in the advancing ribbon or paper tape in accordance with touch tone signals transmitted to the touch tone decoder.