Originally Posted by
xbox.com
Auto-Selection of widescreen
When you use the HD AV pack in widescreen (16:9) ratio while displaying in 480p, 720p, or 1080i mode, note that you may have to manually adjust your television to fit the Xbox display to the shape of the screen.
At the time the Xbox video game system was developed, there was not an established standard for alerting a monitor to a 480p wide-screen mode switch. Therefore, the console does not send a mode-switch signal while outputting in 480p, 720p, or 1080i mode. The console does send such a mode-switch signal while in 480i mode, as an established signal standard did exist for this mode when the Xbox video game system was developed.
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