access to $display from Lisp REPL?



Is it possible to call $display (line 737, comm.lisp) from
inside the Lisp interpreter?  

The definition starts with (defmspec $display (form) ...)

I get a lisp error if I naively call it like a function:
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MAXIMA> (setf s1 "This is my string")

"This is my string"

MAXIMA> ($display s1)

Maxima encountered a Lisp error:

 Error in EVAL [or a callee]: The function $DISPLAY is undefined.

Automatically continuing.
To reenable the Lisp debugger set *debugger-hook* to nil.
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Ted Woollett