PAL and NSC are both formats for specific TV broadcast and receiving equipment. In the UK we use PAL, which has a higher number of lines making up the picture than is used with NTSC, the American standard. Over here, we can currently buy VCR players which will display both PAL and NTSC videos on our PAL television sets. I don't know the details, as I don't have one of them. I also do not know whether one would display a PAL video on a NTSC television set, or whether it is just so that we can watch tapes imported from the USA. That said - the equipment is probably made in Japan, so may be designed to convert both ways.
My old computer was a Commodore Amiga, which used a TV as default monitor, and could be set to use PAL or NTSC for its display.
Quack!
GtD.