80x86 Slides

• Privilege levels for the 80286 microprocessor
• Protected mode addressing using a selector
• Addressing memory data in protected mode
• 80386 paging mechanism

Windows NT Slides

• NT supports multithreading within individual tasks
• NT symmetric multiprocessing (SMP)
• Kernel mode vs. User mode
• NT executive architecture (kernel mode)
• Multiple message queues prevent bottlenecks
• NT user-mode environment subsystems
• NT VDMs use the 386 virtual 8086 mode
• VDMs are preemptively multitasked in protected mode
• DOS VDMs use the Win32 subsystem
• WOW 16-bit cooperative multitasking
• WOW VDMs use the Win32 subsystem
• Separate WOWs provide 16-bit preemptive multitasking
• NT is object-oriented
• Local procedure calls (LPCs)
• Security subsystem (user mode)
• NT security reference monitor subsystem (kernel mode)

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