DOS Backward compatibility? /b/

Does anyone know where I can go to not only see if a command exists in a particular DOS version, but also along  with their available switches? It would be so helpful to be able to look up any DOS command (dead or alive) from DOS 1.0 to 'DOS XP'.

Example: DIR has a switch of "/b" available, but how far backward is that available?

Thank you.

Robert
KentuckyProgrammer