Hello,
I would suggest that you do a Google search on "Lisp OS X" and see if you can port your Lisp 4.2 code into the programs available for OS X. Be prepared for a porting issue though; I do not know Lisp, and have no way to test it. But, I think it would be wise for you to look into the other OS X native solutions instead of investing loads of time.
You can start here:
http://www.david-steuber.com/~david/Lisp/OSX/
Let us know what you find!
Christian
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