The MIT derived Lisp Machines had all an Emacs called Zmacs.
But that was just one application among dozens others. Applications usually were not based on Zmacs, with only a few exceptions: on a Symbolics: Zmail and the Concordia documentation editor application frame. Other tools were not Zmacs based: Listener/REPL, the debugger, the directory editor, the font editor, the PEEK tool to view system details, the document examiner, the tape tool, ...
But that was just one application among dozens others. Applications usually were not based on Zmacs, with only a few exceptions: on a Symbolics: Zmail and the Concordia documentation editor application frame. Other tools were not Zmacs based: Listener/REPL, the debugger, the directory editor, the font editor, the PEEK tool to view system details, the document examiner, the tape tool, ...