"Pedro" == Pedro pedrosl@gmail.com writes:
Pedro> however, when I start Aquamacs, do M-x and type slime I get this message:
Pedro> "Process inferior-lisp bus error"
Pedro> why?
I have not seen that error, and I also use slime on Mac (allthough mostly with SBCL), so I am guessing, but it could a message indicating that the lisp process (CMUCL) has died with a bus error. I would be rather surprised if it is the emacs process (anf not the child lisp process) that generates the bus error since that would quite likely have killed emacs alltogether.
Have you tried running /usr/local/cmucl/bin/lisp from a shell to verify that the binary actually works?
You could also try both in a Mac terminal window and a emacs shell (M-x shell) just to make sure that starting the process from within emacs doesn't tilt something important.
Finally you could consider trying with some of the other emacs' (such as http://www.porkrind.org/emacs) and/or different version of Aquamacs (there is both a released version and a nightly generated snapshot).