Richard of http://www.dragondata.co.uk got to spread out across two display tables today, with a collection of unique Dragon prototypes. He was incredibly generous with his time!
I knew the #Dragon32 had a lot in common with the #TandyColorComputer, but I'd always assumed that was thanks to some kind of licencing arrangement. That's not the case! Richard describes the Dragon 32 as an "incompatible clone" of the #CoCo. Yet Tandy chose not to sue, because the CoCo in turn was a copy of the Motorola 6809 reference implementation!