Display_expand help

Hi all,

I just finished getting my trackball control panel done and it works
fine on my advmame machine..I mainly wanted to set it up for centipede
and marble madness. 

Stupid me, I thought marble madness was a vertical game when it is
really horizontal so now of course the display is squashed and part of
it is off-screen at the edges.

I read about the display_expand option.  Can someone give me a good
setting for a standard CGA arcade monitor so that I can play it on a
vertically oriented monitor?

Thanks! 



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