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Modes of 80386

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The document discusses the different modes of the 80386 processor: Real Mode which allows direct access to memory and I/O but no protection; Protected Mode which allows features like virtual memory and paging for increased security and multi-tasking by enabling descriptor tables and the PE bit; and Virtual Mode which allows real mode applications to run on protected mode systems by virtualizing memory.

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Real Mode- Unlimited direct software access to all memory, I/O address & hardware. Protected Mode- It allows system software to use features such as virtual memory, paging and safe multi-tasking designed to increase an operating system's control over application software. It begins executing instructions in real mode. It starts after the system software sets up several descriptor tables and enables the Protection Enable (PE) bit in the control register 0 .  Virtual Mode - Allows the execution of real mode applications that are incapable of running directly in protected mode Paging – Organize the available physical memory in to 4kb size each, under segmented memory. 8/22/2014 Modes of 80386 Modes of 80386
8/22/2014 Modes of 80386

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Modes of 80386

  • 1. Real Mode- Unlimited direct software access to all memory, I/O address & hardware. Protected Mode- It allows system software to use features such as virtual memory, paging and safe multi-tasking designed to increase an operating system's control over application software. It begins executing instructions in real mode. It starts after the system software sets up several descriptor tables and enables the Protection Enable (PE) bit in the control register 0 .  Virtual Mode - Allows the execution of real mode applications that are incapable of running directly in protected mode Paging – Organize the available physical memory in to 4kb size each, under segmented memory. 8/22/2014 Modes of 80386 Modes of 80386