"Bonanza" aired on NBC in September of 1959. Filmed in color, it was put in the 7:30 PM slot on Saturday nights so that people in the appliance stores could see it on the television sets and be convinced to buy an RCA color television. The ploy worked.
In 1961 it was moved to Sunday nights after NBC realized they had a hit on their hands. It lasted another 13 or so years before being canceled. But it is a landmark in television history.
One suggestion - if you ever find a DVD of "Bonanza" and an episode titled "To Die in Darkness" is listed, don't hesitate to buy the DVD. The episode guest-starred James Whitmore and was filmed in about the mid-1960s. All I will say is that the episode was probably the best of the series.
