Here is a fun rare flashback to 1992 and the rare AutoCAD R11 for Macintosh. Having the actual R11 and R12 for Macintosh physical versions is like having your own private unicorn herd, in a CAD geek way.
From the AutoCAD Release 11 for Macintosh March 20, 1992 Installation Guide.
In the vintage AutoCAD for Mac R11 and R12 versions, we used a mostly standard AutoCAD R11/R12 DOS User Interface on the Mac, but with the current AutoCAD for Mac we asked Mac users what they wanted, and they overwhelmingly wanted a native Mac UI experience with the menubar, palettes, and visors.
Now Back to the Future of today:
The current AutoCAD 2014 Windows