for
   a virtual pin cab.
</p>
<p>
   Wiring a button to a 74HC165 port is similar to a GPIO port input,
   with the addition of a "pull-up" resistor:
</p>
<ul>
   <li>Wire one of the button's switch terminals to a Pico GND pin, or 0V on the PC power supply
   <li>Wire the other button switch terminal to a 74HC165 input port
   <li><b>Also</b> wire the second switch terminal to a 10K resistor, and connect the other end of the
   resistor to the +3.3V power pin on the Pico (3V3 OUT on the <a href="PicoPinout