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143 Reset Circuit You may also want to incorporate a reset button in your circuitry. If so, a normally open, momentary contact switch may be connected directly between pin 4 of the ZX and ground. If other circuitry in your application also needs the reset signal, you may want to isolate that circuitry from the ATN resets using a buffer gate or a diode. A suggested diode isolation circuit for the reset line is shown below. Reset Signal Isolation