SCOER_DISPLAY

National 5841 IC is used for display of video game scores on TV receiver, as well as for time and channel number displays.Properly conditioned H and V pulses must be applied to pins 18 and 19 to interface TV. Output video on pin 15 must be buffered and summed into existing video inside TV set. Display position is controlled by H and V pots. Horizontal display size depends on clock frequency.Grounding M input gives only channel number.Positive voltage at M gives both channel and time. Grounding D input provides 5-slot time display, while positive D input gives 8-slot time display. Channel inputs are applied continuously in negative-logic form, with time inputs multiplexed externally.-D. Lancaster, CMOS Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 158.