N.F.L. 1975 SEASON]
The 1975 NFL season was the 56th regular season of the National Football League. It was also the first time that featured an entire season with no games ending in a tie. The league made two significant changes to increase the appeal of the game:

The surviving clubs with the best regular season records were made the home teams for each playoff round. Previously, game sites rotated… More by division.
The league pioneered the use of equipping referees with wireless microphones to announce penalties and clarify complex and/or unusual rulings to both fans and the media.
Instead of a traditional Thanksgiving Day game hosted by the Dallas Cowboys, the league scheduled a Buffalo Bills at St. Louis Cardinals contest. This would be the first season since 1966 that the Cowboys did not play on that holiday.

The season ended with Super Bowl X when the Pittsburgh Steelers repeated as champions by defeating the Dallas Cowboys 21-17 at the Orange Bowl in Miami. Less