On the game Tempest, the black border at the top of the screen (from the edge to the high score) is almost 2.5 times as high as the black border at the bottom of the screen (from the edge to the credits text).
This seems like a bug to me.
EDIT:
I compared the MAME driver source for Tempest to the source for Quantum (another vertical Atari vector game)...
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possible bug: Tempest - large border at top of screen
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