A better (and potentially more obtainable, *although not much more
attainable*) is to replace the daughtercard with one of the Newer Tech's
PowerPC upgrade daughter cards.  You  see them on eBay occasionally...

btw, sorry about the misinformation vis a vis PB 540 ;-{

--brendan

On 5/2/02 4:58 AM, "Bruce Harada" <bruce@ask.ne.jp> wrote:

> 
> 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
> 
>