Swanie, take a look at older British a/c. Most of the pressurised ones used "cabin compressors" or "cabin superchargers" to supply the necessary air. They were an engine driven "Rootes Blower" actually. Google that. Almost invariably automotive superchargers (not turbochargers) are Rootes blowers.
If you want to know about the consequences of certain failure modes, research the Viscount crash in WA (Pt Headland?) in the long ago. They did not like to be starved of lube oil!