Background: James William Johnson (born July 16, 1943) is an American football broadcaster and former player, coach, and executive. He served as the head football coach at Oklahoma State University-Stillwater from 1979 to 1983 and the University of Miami from 1984 to 1988. Johnson then moved to the National Football League (NFL), serving as head coach of the Dallas Cowboys from 1989 to 1993, winning two Super Bowls with the team (both against the Buffalo Bills), and finally serving as head coach of the Miami Dolphins from 1996 to 1999. As of 2016, he is an analyst for Fox NFL Sunday, the Fox network's NFL pregame show for the NFL games.
Context: In 1984, Johnson was hired by the University of Miami to replace former coach Howard Schnellenberger, who had won Miami's first national championship in 1983 and departed for the recently formed United States Football League. Johnson's hiring was met with an initial response of "Jimmy who?" by the fans and media. Johnson started with a shaky 8-5 record his first season, which included a game in which Johnson's Hurricanes blew a 31-0 halftime lead in a loss to Maryland with Frank Reich as its QB, and also included a 47-45 loss to Boston College immortalized by Doug Flutie's "Hail Mary" touchdown pass on the game's final play. But Johnson developed the Hurricanes into a football program that came to be known as "the Decade of Dominance". In his five years at Miami, Johnson compiled a 52-9 record, appeared in five New Year's Day bowl games, winning one national championship (1987) and losing one to the Penn State Nittany Lions (1986). Johnson created a free-wheeling atmosphere where he allowed, and at times encouraged, his players to showboat, trash-talk, and run up the score. He also brought the modern 4-3 defense predicated on athletic upfield linemen to the forefront. The criticism they received from other teams caused the media to deem them the "Bad Boys of College Football", a moniker Johnson openly accepted. Johnson's Hurricanes posted the school's first undefeated regular season in 1986, only to lose the Fiesta Bowl and the national championship to #2-ranked Penn State. The loss, along with losses in Miami's prior two bowl games, began to raise questions about whether Johnson was capable of winning major games. In the ensuing 1987 season, however, the Hurricanes went undefeated in the regular season yet again, and won the school's second national title by defeating Oklahoma for the third season in a row. Johnson also created controversy by allowing the University of Miami to retire Vinny Testaverde's football jersey number #14, but refusing to retire Bernie Kosar's number #20, though Kosar played one season for Johnson and led the Hurricanes to the national title (though that did not come under Johnson). Johnson's reason for not retiring Kosar's number was, "Bernie didn't finish the program here (at Miami)." Kosar graduated with honors a year ahead of his freshman class in 1985 with a dual major in finance and economics and subsequently entered the NFL's supplemental draft. Testaverde won the school's first Heisman Trophy award in December 1986 and was the first player selected in the 1987 NFL Draft. However, Johnson later reached out and signed Kosar, who was thrown out by the Cleveland Browns during the 1993 NFL season, to be the Cowboys backup to Troy Aikman, playing during the Cowboys 1993 Super Bowl run and clinched the NFC Championship game, earning a Super Bowl ring. Johnson was inducted into the University of Miami Sports Hall of Fame in 1996. In May 2012, Johnson was inducted into the College Football Hall of Fame. CANNOTANSWER
Question: When did Jimmy go to U of M?. Whats the answer?

In 1984, Johnson was hired by the University of Miami to replace former coach