Season 1 CBS , 1979 - 1980 Season 2 CBS , 1980 - 1981 Season 3 CBS , 1981 - 1982 Season 4 CBS , 1982 - 1983 Season 5 CBS , 1983 - 1984 Season 6 CBS , 1984 - 1985 Season 7 CBS , 1985 - 1986