I'm pretty
sure they're the same in practice -- and in any case neither
PAL nor SECAM mandate the resolution, only the colour coding.
Really?
Really.
Checking my somewhat old list of _broadcast_ TV systems used around the
world, I can find PAL used with both 525 and 625 lines. NTSC was only
used with 525 lines nad SECAM with 625.
But those are the _broadcast_ standards. There is nothing to stop you
making a device with RS-170 (525 lines, 60 Hz vertical) using SECAM
colour encoding. Or a 625 line system using NTSC colour encoding. Or for
that matter any (odd) numbr of lines that you like.
The *cough* website I looked at listed specific resolutions for each
(including NTSC). Perhaps the site had some misleading information? (don't
ask for an URL, it's been too long)
There is a lot of very good information on the web, but alas there's a
lot of misleasing and downright wrong infroation out there too.
-tony