If you go to AVS and search under "HD DVD software," you find an HD DVD test pattern thread where 'Dr. Z' created some HD DVD test patterns which are said to be accurate. You can download them and burn them as an ISO file to a DVD+R, etc. presuming you have a DVD burner.
For HD color decoding, be sure use pattern 709 (instead of 609 which is SD).
No one knows, but that doesn't matter. The point of the disc is to provide accurate testing patterns and audio signals so one can fully calibrate his HD DVD player to his display, equipment, etc.
Did find the site, thanks now having a hard time with the ISO file and Nero 6 to burn it to disk. have burned before, but I guess just having a senior moment or day???