Yeah the black borders on PAL games don't mean anything in relation to them either being NTSC originated or Atari ST ports, whilst some do, the only reason a lot of especially earlier Amiga games have borders is pure and simple to keep the game speed up.
It wasn't until dedicated Amiga games from companies like Team 17 that used overscan and displayed full screen on PAL, its today's world it would be hard to understand why a game wasn't full screen, but a lot of Amiga games weren't. And the reason why black bar PAL games still get cropped on NTSC machines is because the screen area is still centered and without NTSC code it will just cropped the bottom 96 lines off.
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