Mike,

******You are right of course but every pressurized airplane that I am
familiar
with uses air compressed by a turbocharger or turbine engine compressor
(pretty much the same thing.)******

I'm sure you are vaguely familiar with the King Air 90, A90, and B90. None
of these use bleed air for pressurization. They have a Roots supercharger on
the left engine that supplies pressure for the cabin. Weird! Supposedly the
FAA was concerned about bleed air into the cabin in early turboprops.

Best