while using only a couple of
   the device's native ports.  Pinscape currently supports one such
   chip, the PCA9555.
</p>
<p>
   Connecting a PCA9555 chip to the Pico only requires two GPIO ports
   on the Pico, and in exchange, you get 16 new digital in/out ports -
   a net gain of 14 ports.  Better still, you can connect up to 8 of
   these chips to the Pico, all sharing those same two GPIO ports.
   For a virtual pin cab, you can get all the button inputs you'll
   probably ever need with just two of t