To run this, unextract the usim-2023-03-24.tar.gz file.  Then,

  cd usim; make; cd -
  ./usim/usim -c usim-100-0.ini

And you should have the Lisp Machine running on the CADR.  See the
Lisp Machine Manual, or the Operating the Lisp Machine manual for
details on how to use the system.