Play Original Xbox Games in HD (High Definition)

It seems that the original Xbox can be "forced" into Hi-Defenition mode. In the following video the user claims that the original Xbox can be forced into High Definition mode and allows all original Xbox games to be in HD, even if they were only meant for standard definition. Therefore the standard 480p games can be played in 720p and 1080i HD upscaled.

To connect the original Xbox to a HDTV you must have a High Definition AV Pack. High defenition is accessed via component cables, these are the best video cables for the original Xbox, HDMI is not accessible. The original Xbox allows up to 1080i HD. There are plenty original Xbox games that offer HD support as well as emulators for original Xbox.

*concerning the PAL region, your original Xbox must have a softmod installed to access HD settings

Instructions for forced High Definition:

Enter "settings" from the Xbox dashboard
Enter "video"
Choose "normal" video mode
Choose "yes" for 480p, 720p and 1080i
Return to the Xbox dashboard
Hold the following buttons together left trigger, right trigger, left analog stick (button), right analog stick (button)
Your original Xbox is now in forced HD mode. The mode will remain even after shutting off the Xbox. To resume your Xbox to standard simply re-do the steps prior.

Synopsis:

The following HD formats are supported for Gaming
480i/480p/576i/576p output at 480p (Not Scaled)
480i/480p/576i/576p output at 720p (Upscaled)
480i/480p/576i/576p output at 1080i (Upscaled)

*720p & 1080i resolutions are not supported, at any output resolution

Original Xbox Supported Video Formats and Resolutions
This is a comparison table of common video-codecs to show what the original Xbox 733Mhz PIII CPU and 64MB RAM can handle. Click on image to enlarge.