In 1974, the second channel of the Bulgarian Television was launched, with the original channel being called simply "first channel". Later, they were given on-screen logos and were named "BT1" ("БТ 1") and "BT2" ("БТ 2"). In the late 1980s, some western programming was allowed, including Pink Panther cartoons and the television series "La piovra" ("Октопод") and "Escrava Isaura" ("Робинята Изаура"). Ivan Garelov's "Panorama" and Kevork Kevorkyan's "Vsyaka nedelya" talk shows/news magazines were among BT's most popular programs. With the fall of the communist rule in 1989, the two channels changed dramatically. They started airing a lot of US films and TV series, one of the first being "The Flintstones" ("Семейство Флинтстоун"). Their names were also changed, BT 1 became Kanal 1 (Channel1) (Канал 1) and BT 2 became Efir 2. The television organisation's name was changed to Bulgarian National Television. In the 1990s, BNT changed the color television system to PAL, while keeping compatibility with older TV sets by using the DK audio standard (on such sets, only black-and-white picture is seen). Efir 2's frequencies were sold in 2000 to News Corporation for the country's first over-the-air national channel: bTV. In 2008, Channel 1 was again renamed to BNT 1. The second programme started again in 2011 under the name BNT 2. It merged the regional BNT programmes.