moss>You'll probably find that the "float" of ARM was to soothe Apple's worries about using a chip from a compeditor (it also meant Apple could influence future developments of that chip - who knows the more cynical might think they'd use the oppertunity to steer ARM development away from the desktop market and leave Acorn floundering). As for Xemplar it was set up with an Apple man at the head (used to be a big wig in Apple's Cork (Ireland) operation) - who knows maybe it was a way to "steer" some educational institutions towards Apple rather than Acorn.
I'd be interested in what Richard Hallas discovers about that phase in Acorn's history.
From my slightly jaundiced perspective Apple generally do what benefits apple, taking the ARM out of Acorn's control and having a direct sales route into Acorn's main customer base was a real coup for Apple - and an enormous own goal for Acorn. Yet another case of Defeat snatched from the jaws of victory methinks.