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Blue Box(operating system)
The complete implementation of the Mac OS run-time environment on the more modern Rhapsody operating system. Blue Box is not an emulation layer; at any given time it will be based on the same source code and ROM image as the current version of Mac OS and will thus incorporate future Mac OS improvements.
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Blue BoxA programming interface (API) for Apple's Rhapsody operating system, which later became Mac OS X. The Blue Box was the Mac Toolbox API, which enabled a Mac OS 9 or previous Mac application to run without modification. The Blue Box was renamed Classic in OS X. See Mac OS X, Classic Environment and Yellow Box.
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