I have heard that later Powerbooks, into the early G4 series even, used ADB internally for the trackpad. What would be involved in hooking into that, I have no idea.

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Yes, that is the cause why some ADB driver code is hidden inside MacOS X even for the late Titanium PowerBooks. The lack of ADB driver support is the cause for the limited functionality of the Griffin iMate adapter in combination with recent systems.

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