You're missing that MAME scales the game to appear in the correct aspect ratio on your monitor. If you're using a common 16:9 or 16:10 flat panel, that's going to skew the calculations (but the results are correct). One of the video options in the tab menu turns that off, I forget what it's called off hand.
Edited by R. Belmont (02/11/11 05:20 PM)
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