old tech and new tech can play together

Two of my grandchildren are spending the weekend with me and this afternoon we spent some time beginning to clear out a storage room (aka junk room) in the basement.  Wonder of wonders, my grandson discovered, tucked away in a corner, all of the components - box, dual controls, etc. - of a Nintendo 64 system and a Zelda game, among others.  Considering where these were found (it's like an archaeological dig in that room) I think they must be about 20 years old.  What I really find astonishing is that my grandson was able to hook everything up to my 3-year-old hi def TV and it's working beautifully, it even looks good in the wide screen format.  How fun is that?