Tom just emailed to me a set of 5 of these Denon 5805 Kaseikyo signals learned from the original remote. Meanwhile I misplaced the pdf file with Denon's description of those signals.

I got (different) Denon pdf files listing Kaseikyo signals by email from two people. I haven't found those files on Denon's website, but Denon seems to have that kind of information on the web site.

If anyone has the URLs for those pdf files, I think that belongs in this thread.

Meanwhile, the five learned signals I have follow the Kaseikyo standard for the usage of the last four bits. I think I remember that the PDF file documented those last four bits and they didn't follow Kaseikyo standard. Once I find that pdf again, I'll look up these five signals and compare the learned versions to what Denon documented.