The large border at the top of Tempest

[krick]

I posted this over at MAMEWorld, but I'd like to get Calamity's thoughts on it...

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.

I compared the MAME driver source for Tempest to the source for Quantum (another vertical Atari vector game)...



I don't understand the visible area numbers.   First, a vector game doesn't have pixels, so I'm not sure what the "visible area" is supposed to mean in this context.  Second, the ones for Tempest are nearly a square.  Third, the area for Quantum is larger than the 640x480 (interlaced) that GroovyMAME runs it at.