On Thu, 9 Feb 2012, Marc S. Ressl wrote:
Another question... on PAL Apple II's, full-screen text is displayed in white (as is the case for NTSC, because there is no color carrier). But is that also true in mixed mode? In NTSC it is, because the color carrier is turned on.
As we have discussed some time ago with M.J. Mahon, even if some lines don't have color carrier, they will still be displayed in color. It's because of the way TV's color carrier detector works - it has LPF for stability. If you feel lucky with searching you might find Michael's estimate of the time constant.