Therefore setting the variable inferior-lisp-program as in
(setq inferior-lisp-program "c:/home/bin/ccl/wx86cl64 -K utf-8")
is not enough to change Lisp implementation?
for an example setup, see slime-lisp-implementations e.g. here:
http://dwim.hu/darcsweb/darcsweb.cgi?r=HEAD%20hu.dwim.environment;a=headblob...
hint: in my experience it's more effective to search for this string in the slime sources and to run through the code/comments around the matches...
The more I spend time with Emacs-SLIME the more I'm confused...
well, slime's defaults are not exactly newbie friendly... you need to climb that fence (i oppose that, but i don't have the influence to change it).