http://www.macnn.com/articles/02/12/17/how.to/
How to install an internal Bluetooth adapter
updated 05:20 pm EST, Tue December 17, 2002
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MacProf has published an interesting tutorial that shows how to install an "internal" Bluetooth adapter into a PowerBook G4. The demonstrated implementation allows for rapid removal of the device, should it cause radio interference in a specific situation. Internal installation of the Mitsumi adapter requires soldering, and thus voids the warranty of the PowerBook.
