Electronic digital tape timer

Abstract From the Canadian patent

A digital tape timer containing a counter and associated arithmetic control and timing logic to detect the relative tape position and provide a time-multiplexed binary coded decimal (BCD) output for the display of the tape position in hours, minutes, seconds and/or tenths of seconds of play/record time at any of the selected tape speeds. The timer employs an eight digit format; five digits are displayed and one of the three remaining digits becomes the least significant digit whose modulus is altered to present the correct division rate to the incoming tach pulses. The counter generates serial digits with one digit appearing on a selected clock line, whereby all eight digits are transmitted …