Edit: Updated information on V-Blanking   I'm doing some more reversing, but I'm not 100% familiar with the NES hardware.   First off, my R.O.B. does not work with my LCD TV. But I can see that the flashing signal gets messed up by the de-interlacing.   Secondly, Gyromite is programmed to wait to start at a certain point before it flashes each screen. First it waits for V-Blank to clear the Sprite 0 Hit bit of the PPUSTATUS, then it waits for the Sprite 0 Hit to occur again. If you step it