Original Xbox emulator legality

Hey all, so I saw a video on youtube of an old xbox game, and my nostalgia kicked in like mad lol. I found an Xbox emulator called xemu or something available for mac but was wondering about the legality.

But my first question is, how does it work? Like, after installing the emulator itself do I get the ability to install games that are available?

And if that is how it works, how does the legality of the entire situation work? I know that installing emulators are legal but what about the games? For example, if I download Battlefront and Need for Speed Hot Pursuit 2 (two random games I wanted to play), would it be illegal to download those games only for personal use? And if the answer is "it is illegal" does it make a difference that I own the physical copies of those games (I have the discs but no longer have a console to play them on)?

 

Appreciate the opinion, I'm talking to a friend about getting his PS2, so that would solve my problem anyways, would just have to repurchase the PS2 versions of the games I want

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Thanks for this information, that helps a lot.