Is the Xbox 360 wired controller backwards compatible with Xbox?

[Requiem]

I know that it has USB, but I think I saw a pic where it detaches along as certain part and I am wondering if this detached port can go into the original Xbox port.

Sorry for the rather n00b-ish question.

 

[Mattte]

Nope, which sucks, since the original's controller ports are modified USB ports.

 

[slickkill77]

No just a wee bit to small slash squared off to fit