Short answers, pulled from the story.
The first regular season NFL game aired on CBS television on the 30th of September 1956. This broadcast featured the visiting Washington Redskins against the Pittsburgh Steelers and marked a pivotal shift in sports media history.
The first color broadcast of a regular-season NFL game occurred on the 25th of November 1965 in Detroit. By 1968 all network telecasts transitioned fully to color broadcasting after only two games were shown in color that entire season.
Pat Summerall and John Madden worked together as commentators starting on the 25th of November 1979 during a Minnesota Vikings versus Tampa Bay Buccaneers broadcast. Their partnership lasted twenty-one seasons until Fox acquired rights in 1993.
CBS lost its NFL coverage because Fox won the broadcast rights to the National Football Conference on the 18th of December 1993 by outbidding CBS significantly. Fox placed a record bid of fifteen point eight billion dollars for four years while CBS offered two hundred ninety-five million annually.
CBS returned to NFL television on the 6th of September 1998 after acquiring American Football Conference rights from NBC. The network had spent four years without any professional football broadcasts while rebuilding its sports division.