Multi-tasking also runs a sizable number of threads; intense multi-tasking scenarios have actually shown improvements of considerably more than two times.
The 80286 was designed for multi-user systems with multitasking applications, including communications (such as automated PBXs) and real-time process control.
Zilog added a memory management unit (MMU) to expand the addressing range to 16 MB, features for multitasking and multiprocessor and coprocessor configurations, a 256 byte cache, and a huge number of new instructions and addressing modes (giving a total of over 2000 combinations).
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However, like any server software on the "classic" Mac OS, Butler was seriously hampered by the Mac's single-user file system and limited multitasking and could never really deliver the sort of performance the same server would have on Windows NT or Unix.
To implement a task switching or multitasking environment, it was thought that a special, separate key was needed.