TELEVISION - April 13, 1993

Briefly: Pop group En Vogue, rappers Heavy D and Tone Loc, and “In Living Color’s” Jamie Foxx guest on the two-part season finale of “Roc.” The episode airs May 2 and 9 on Fox. . . . Fans of the late jazz trumpeter Dizzy Gillespie will want to tune into the April 27 episode of “Tribeca,” on which Gillespie, along with former New York Mayor Ed Koch, guests. . . . CBS will air an hour special about “Knots Landing” just before that show’s two-hour May 13 series finale. The “Knots Landing Block Party” will feature series stars recalling their favorite moments from the show.