Between 1989 and 1991, several add-on computer disks were released for Jack Nicklaus' Greatest 18 Holes of Major Championship Golf and Jack Nicklaus' Unlimited Golf & Course Design, adding additional golf courses and features. The disks are compatible with both games. Jack Nicklaus Presents the Major Championship Courses of 1989 adds courses from major 1989 golf championships: Oak Hill Country Club (1989 U.S. Open), Royal Troon Golf Club (1989 Open Championship), and Kemper Lakes Golf Club (1989 PGA Championship).