I remember how things all changed one night either late in 1982 or early in 1983.
The Lakers were hosting the Philadelphia 76ers. They decided to experiment, by putting a home game on cable! I can't remember the cable station, but I do remember that it had to be on cable, because my dad asked to come over to the apartment to watch the game. It was really incredible to see a home game on TV for the Lakers...last I can remember, they would show some home Finals games in 1980 against the 76ers, but some of those were tape-delayed (weeknights), but the Sunday games may have been live.
Anyway, it was really an anomaly. The Lakers won that game, then I believe it was the next season or the season after that they started showing home games on Prime Ticket. Of course, the games were being sold as part of a cable package.