On Wed, 1 May 2002 21:54:56 +0200 (MET DST)
Juergen Tritthardt <juergent@mpimf-heidelberg.mpg.de> wrote:

> To my knowledge the 540C has also a 68LC040 like the 520, the difference
> is the clock speed (33MHz external, internal 66MHz). The only classic
> PowerBook with full featured CPU is the 550. The CPUs are soldered, so no
> easy exchange.

Soldered, but on a daughterboard. I'm guessing here, but if you could find a
junked 550 (yeah, right) you might be able to swap in its daughterboard with
the full 68040.

Bruce