Possibly stupid question, but...
I downloaded the Doom 1.2 binary to Previous 3.0, copied my doom.wad file over and when I go to run the doom.app it fails saying it can't find the init files.
Not sure what to do about this.
Ok, seems it doesn't like running with the full wad to start with. Run the shareware wad once and then you can go in and change things around. Got it running now. The joy of working overnights and having too much time 😎