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I think there were some progressive-scan/480p TV sets just before HD sets became commonly available, and, yes, the 480p feature is intended for those TV sets (or for SD/HD CRT sets). In that era, quality of deinterlacing varied quite a bit from one player to another, and from one display to another (and still can, to some degree). A good modern display can do a much better job than most DVD players, so it is usually just as well to leave the player in 480i mode. "Progressive scan" is still added to players today because it costs about zero to do so, and probably helps to sell them, justified or not.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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