Screen off center on Original XBOX

[Bct182]

 Hello,

I'm hoping someone can help me as I'm very frustrated. I'm trying to set up Mugen on a XBOX I modded for my boys. It's a 1.6 with a 250gb hard drive that was softmodded with the unleashX dashboard. I installed XBMC as an app and set it to boot straight to XMBC. I have to use file manager to go back to unleashX for FTP to work.

My boys of course want the huge character choices on Mugen. Since I'm new to this and my knowledge is limited I was looking for a pre-build FTP and play Mugen download.

Ive downloaded two different Mugen versions that load and can be played.

The issue is, I cannot figure out the screen issue I am having. The screen is slightly oversized so I cannot see the far right and bottom side of the screen.  I cannot figure out how to shrink the display down so that the entire screen is displayed on my TV.

I would really appreciate some advice and thanks for reading.