USB BitScopes require the installation of a driver when used with Mac OS X.
Unlike Windows, this is not automatic, but also unlike Windows it's very easy!
Simply download the driver and run the installer.
If you have only one BitScope there is nothing more to do.
If you have more than one BitScope you may need to configure the BitScope Software to use the right one. See this explanation of how it's done (this explanation is for Windows, but it's the same on the Mac, only the COM port names are different).
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