|Originally posted by montreal
The Genesis chip is the actual DVI decoder chip. It only connects to the video 7 input, the DVI connector. It converts whatever arrives in an encrypted digital form to analog. Only HD formats are converted, 1080i and 720p. Neither 480i nor 480p are HD formats and neither will ever be transmitted over a DVI wire.
If you have a DVD player with a DVI output, then the player will rescale the numeric image from the disk to 1080i (or possibly 720p - a bad choice for CRTs because a subsequent conversion to 1080i is required) HD format and also do a pseudo encryption.
The DVI input on Sony TVs conforms to the EIA-861 standard, and I'm pretty sure that specification includes most or all of the ATSC formats currently in use, including 480p, 720p, and 1080i. (It will also support HTPC variations on these provided the timings conform to one of the standard ATSC modes.) My personal experience using the 480p DVI mode on the Samsung 931 DVD player, and 720x480p modes on my DVI HTPC confirms this as well. 480p via DVI works fine.
Perhaps some of my earlier remarks regarding the upconversion of 848x480p to 540p caused some confusion on this.
DVI can also be used to transmit a variety of other kinds of signals including VESA computer modes like 1024x768, and 1280x1024. Most HDTVs do not support these modes though, and wouldn't know how to display them. Aside from the differences in timings, resolutions, and HDCP support, the VESA computer modes and the EIA-861 HDTV modes seem to work pretty much the same. Both are essential just digital RGB. So most HDTVs are really just glorifed dual- or multi-scan computer monitors, with a few different trimmings here and there.