Hmm.. I thought the original strengths of things like DCTV was that they could create 24-bit GFX that was suitable for genlocking and other analog video stuff like that.
These days most (all?) broadcast/TV imagery is done in the digital domain, so isn't all that's needed is a video card that'll do 1920x1080 and a support video in and fast CPU to push thing along?
Feel free to correct me if I'm WAYYY off! :-)
Cheers,
Mike.