Differences between PAL and NTSC:
1) The colour information is carried differently. This means that the TV has to be capable of understanding the NTSC colour signal; from what you say, yours is.
2) The frame rate is different. On PAL, the frame rate is 25hz i.e., each full picture takes 1/25 second to display before moving on to the next. On NTSC it is 30hz. This means a faster refresh rate for NTSC. Unless you have a "100hz" TV you may notice this as reduced "flicker" on bright parts of the picture.
3) The number of horizontal lines making up the picture is different. On PAL it is 625 (of which 576 are actually used for the picture). On NTSC 525 total, 480 used. This means that the vertical definition of an NTSC picture is slightly lower than on PAL although for practical purposes you are unlikely to notice any difference, unless you sit very close to a very large screen.
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