Was Ralph macchio on joanie loves cha chi?

Yes, Ralph Macchio appeared in the sitcom "Joanie Loves Chachi," which was a spinoff of "Happy Days." He played the character of "Johnny," who was a friend of Chachi Arcola, portrayed by Scott Baio. Macchio's role was notable as it showcased his talent before he gained widespread fame in "The Karate Kid." The show aired from 1982 to 1983.