Very interesting that the architecture has no condition codes, or any global state for that matter. Also, that the belts are logical, in that there really isn't a chunk of memory where the belt lives, but the members of a belt live where they live and know "which belt" they belong to and "where on that belt" they are.
Too bad they can't release their emulators/simulators, but I sympathize with their desire to be first-to-file to protect what sounds like years of work.