Keep up the good work Nigel. I'm pretty sure the early work that I saw on the web
didn't include a clear description of the command &or status bytes &or bits.
(I may have even posted a link somewhere here, but lost track of it).
I'm hoping that you will include this kind of detailed information in your posts.
It might be a first for the WWW,
to have this kind of industry inside data exposed.
Hopefully, the protocol and bit definitions will be standard across many product lines.
But, even if they aren't, your methods and results will still be very useful as a guide for other experimenters.