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The Mac OS nanokernel is an operating system kernel that serves as the basis of most PowerPC based system software versions 7 through 9 of the classic Mac OS, predating Mac OS X.
The initial revision of this software is a single tasking system which delegates most tasks to an emulator running the Motorola 68000 series (68K) version of the operating system. The second major revision supports multitasking, multiprocessing, and message passing, and would be more properly called a microkernel. Unlike the 68K-derived Mac OS kernel running within it, the PowerPC kernel exists in a protected memory space and executes device drivers in user mode.
The nanokernel is very different from the Copland OS microkernel, although they were created in succession with similar goals.[1][2][3]
^Inside Macintosh: PowerPC System Software. Apple Technical Library. Reading, Mass.: Addison-Wesley Pub. Co. 1994. ISBN 978-0-201-40727-3. OCLC 29636881.
^Inside Macintosh: PowerPC System Software. Apple Technical Library. Apple Computer, Inc. July 3, 1996. Archived from the original on May 18, 2008. Retrieved April 4, 2013.
^"Technical Note TN1084: Running CFM-68K Code at Interrupt Time: Is Your Code at Risk?". Apple Computer, Inc. March 27, 1997. Archived from the original on June 23, 2004. Retrieved April 4, 2013.
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