struggling with minor issue on porting of maxima



most everything seems to work in Allegro common lisp 9.0, not including 
graphical front end
or plotting (neither of which I have even tried);
except in the old-fashioned read-eval-print loop, the
(maxima::continue) program does not catch errors like macsyma-quit or 
to-maxima-repl.
Now maybe no one is still using the relevant code in suprv1 or init-cl 
or macsys,
but if someone has a thought about why there are not any relevant 
"catches" for
these throws, I'd welcome suggestions.

Typing something like 0/0;  gives a bunch of messages describing the
error and then Attempt to throw to the non-existent tag macsyma-quit...

Thnx

PS. Why no plot or front-end? I'm trying to keep the build process 
ENTIRELY in Lisp.
No make, no gcc, ... Just lisp. Maybe this is unnecessarily retro. and I 
rarely use
plotting;  I don't mind the more primitive front-end controlled in emacs.