anchor.diff:               *start*)
             internal-time-units-per-second)))
   
  +;;; Rendering function
  +
   (defun paint-time ()
     "Paint the elapsed time to the center of the screen."
     (multiple-value-bind (width height)
  
positive.code:                                     printed-time
                                      (- (floor width 2) length/2)
                                      (floor height 2)))))
  
  (defun main ()
    "Start the timer program."
  
negative.code: ;;; interface. Run MAIN and press the space bar to start, stop, and
  ;;; clear the timer. Press 'q' to quit.
  
  
  ;;; Timer state & manipulation
  
  (defvar *start* nil)
  (defvar *stop* nil)
  