That's fairly obvious I think. I'd expect that as Pentium M's were mobile class CPUs, they weren't expected to handle significant quantities of RAM and therefo

That's fairly obvious I think. I'd expect that as Pentium M's were mobile class CPUs, they weren't expected to handle significant quantities of RAM and therefore didn't need PAE. I can't think of a single Pentium M machine I had that ever saw more than 2GB of RAM.