It's definitely interlaced output, though in most display modes the content is progressive (i.e., both fields look the same) - which is a bit of a dumb arrangem

It's definitely interlaced output, though in most display modes the content is progressive (i.e., both fields look the same) - which is a bit of a dumb arrangement, really, since you get all of the flicker and none of the benefit. Fortunately there's a command to switch it off, and no TV seems to mind displaying 50.08Hz output rather than 50Hz...