The Apple I actually shipped with a full disassembly of the ROM, with Woz's comments.
http://s3data.computerhistory.org/brochures/apple.applei.197...
http://s3data.computerhistory.org/brochures/apple.applei.197...
If someone’s really keen how about annotating the old GEOS applications from the c64? Someone’s already done the OS.