Watch a broadcast TV signal on an old CRT: The scanlines appear to roll up (or down, depending on how you are trying to perceive them).<p>Hook up an NES to an old CRT and look closely at the screen: The scanlines are absolutely still. (This is also the case with the full-screen menus of VCRs, with the white text on blue background.)<p>The NES most definitely outputs progressive-scan video at 240p, with all 240 lines drawn 60 times per second.