
   shift registers, and GPIO extenders, with the caveat that some of those
   outputs are "active low" only, which requires a little tweaking to the
   circuit designs shown for the basic booster circuits.
</p>

<h4>Logical outputs</h4>
<p>
   On the Windows side, none of the software knows anything about Pico GPIO
   ports, TLC59116 chips, or any of the other hardware that the Pico can use
   to control output devices.  So how does the Windows software know how to
   activate your shaker motor or flasher 