Real Address Mode of 80386

The instructions available in the 80386 that are not available in its real address mode is

• addressing techniques
• instructions for protected address mode
• instructions for interrupt handling
• all of the mentioned

The unit that is disabled in real address mode is

• central processing unit
• memory management unit
• paging unit
• bus control unit

To form a physical memory address, appropriate segment register contents are

• shifted by left by 4 positions
• added to 16-bit offset address
• operated using one of addressing modes
• all of the mentioned

The segments in 80386 real mode are

• overlapped
• non-overlapped
• either overlapped or non-overlapped
• none of the mentioned

The operation that can be performed on segments in 80386 real mode is

• read
• write
• execute
• all above

The selectors contain the segment’s

• segment limit
• base address
• access rights byte
• all above

The linear address is calculated by

• effective address + segment base address
• effective address – segment base address
• effective address + physical address
• effective address – physical address

If the paging unit is enabled, then it converts linear address into

• effective address
• physical address
• segment base address
• none of the mentioned

If the paging unit is disabled, then the linear address is used as

• effective address
• physical address
• segment base address
• none of the mentioned

The paging unit is enabled only in

• virtual mode
• addressing mode
• protected mode
• none of the mentioned