Podcast
Questions and Answers
80386 features ______ and Virtual Memory
80386 features ______ and Virtual Memory
Multitasking
Virtual Memory helps enlarge the ______ space
Virtual Memory helps enlarge the ______ space
address
ADS stands for Address Data ______
ADS stands for Address Data ______
Strobe
NA causes the 80386 to output the address of the next instruction or data in the current bus ______
NA causes the 80386 to output the address of the next instruction or data in the current bus ______
Memory is divided into 4 8bit ______ called memory banks
Memory is divided into 4 8bit ______ called memory banks
Real mode allows to address only the first 1MB of ______
Real mode allows to address only the first 1MB of ______
In protected mode, segment register contains a ______
In protected mode, segment register contains a ______
Each table contains 8192 ______
Each table contains 8192 ______
Protected mode allows access above the first 1MB of ______
Protected mode allows access above the first 1MB of ______
Segment address is the beginning address of any 64KB memory ______
Segment address is the beginning address of any 64KB memory ______
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Study Notes
80386 Features
- Offers both segmentation and virtual memory capabilities, enhancing system architecture.
- Virtual memory expands the available address space for applications, enabling more efficient resource management.
- Address Data Space (ADS) facilitates the organization and movement of data within the system architecture.
Operation of 80386
- NA (Next Address) signal directs the 80386 to identify the next instruction or data in the current bus cycle, crucial for instruction fetching.
- Memory is structured into four memory banks, each consisting of 8-bit sections, allowing for organized data storage and retrieval.
Memory Modes
- Real mode restricts access to only the first 1MB of memory, limiting the program's operational scope.
- Protected mode utilizes segment registers to manage memory access, enhancing system security and application stability.
- Each segment features a base address, which is the starting point of any 64KB memory block.
Tables and Memory Access
- Each segment table is designed to hold 8192 entries, facilitating structured memory management within protected mode.
- Protected mode permits access to memory beyond the initial 1MB limit, allowing for more extensive applications and multitasking environments.
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