<Tr> <Th> Original network </Th> <Td> NBC (1975--89, 1991) CBS (1989--91) Syndicated (1983--present) </Td> </Tr> <Tr> <Th> Picture format </Th> <Td> 480i (SDTV) (1975--2006) 720p / 1080i (HDTV) (2006--present) </Td> </Tr> <Tr> <Th> Audio format </Th> <Td> Stereo </Td> </Tr> <Tr> <Th> Original release </Th> <Td> Network January 6, 1975 (1975 - 01 - 06)--June 30, 1989 (1989 - 06 - 30) (NBC) July 17, 1989 (1989 - 07 - 17)--January 11, 1991 (1991 - 01 - 11) (CBS) January 14, 1991 (1991 - 01 - 14)--September 20, 1991 (1991 - 09 - 20) (NBC) Syndication September 19, 1983 (1983 - 09 - 19)--present </Td> </Tr>

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