I'm a bit confused about NTSC video and hoping someone here might be able to explain this to me. I've always understood (and just verified) that NTSC has 525 scanlines. A book I recently read about the Atari 2600 ("Racing the Beam"), which doesn't have a frame buffer and hence forces programmers to use the horizontal and vertical blanking intervals for game logic, stated that NTSC had 192 scanlines. I don't doubt that the Atari's resolution would have been 192 lines instead of 525, but how does that work with old CRT TV's which have an electron gun making (I believe) 525 passes? I can understand that the gun could make several passes, drawing multiple, identical lines, but that would give the programmer additional horizontal blanking intervals, while with the 2600 the programmer can expect 192 horizontal blanking intervals per vertical blanking interval. Surely CRT's can't make dots of different sizes, can they?
I realize this doesn't apply to LCD and plasma TV's, which have fixed pixels.
I realize this doesn't apply to LCD and plasma TV's, which have fixed pixels.