(maxima.info)Interrupts

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32.2 Interrupts
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The user can stop a time-consuming computation with the ^C (control-C)
character.  The default action is to stop the computation and print
another user prompt.  In this case, it is not possible to restart a
stopped computation.

   If the Lisp variable '*debugger-hook*' is set to 'nil', by executing

     :lisp (setq *debugger-hook* nil)

then upon receiving ^C, Maxima will enter the Lisp debugger, and the
user may use the debugger to inspect the Lisp environment.  The stopped
computation can be restarted by entering 'continue' in the Lisp
debugger.  The means of returning to Maxima from the Lisp debugger
(other than running the computation to completion) is different for each
version of Lisp.

   On Unix systems, the character ^Z (control-Z) causes Maxima to stop
altogether, and control is returned to the shell prompt.  The 'fg'
command causes Maxima to resume from the point at which it was stopped.