A
Scenario: An instruction requires accessing data from a different segment than where the code is located. Which segment register would be used in this scenario?
d) ES (Extra Segment)
Scenario: The 8086 microprocessor needs to address data in different segments. How many segment registers does it have for this purpose?
c) 4
Scenario: The offset within a segment is specified in an instruction. What role does the offset play in calculating the physical address?
c) It adds to the segment address to determine the physical address.
Scenario: A developer needs to perform string operations, like moving data blocks. Which pair of registers are often used together for such operations in the 8086 microprocessor?
c) SI and DI
Scenario: In assembly programming for the 8086, you need to perform a loop operation where the loop count is decremented automatically. Which register is usually involved in this?
b) CX
Scenario: A function call needs to save the address for returning to the caller after execution. Where is this return address typically stored?
b) Stack
Scenario: A subroutine accesses local variables stored on the stack. Which register is commonly used to point to the base of the stack frame?
c) BP
Scenario: An interrupt occurs while executing a program. Where is the return address stored during this interrupt handling process?
b) On the Stack
Scenario: You need to transfer control to an interrupt service routine located in a different segment. Which registers are updated for this purpose?
b) CS and IP
Scenario: A software developer needs to implement a software delay loop. Which register would be typically decremented in each iteration?
c) CX
Scenario: You want to set up a data structure that crosses segment boundaries. How would the 8086 handle such a situation?
d) By using a far pointer
Scenario: In a memory model with separate data and code segments, where would variables typically be stored?
b) Data Segment (DS)
Scenario: An instruction requires accessing the next byte of data in a string. Which index register would be incremented in this scenario?
a) SI
Scenario: An interrupt-driven application needs to manage high-priority tasks. Which interrupt type does the 8086 microprocessor use for hardware-based interrupts?
b) Non-Maskable Interrupt (NMI)
Scenario: You need to access a global variable stored in a different segment from the current code. How would you address this variable?
c) By using a far pointer
Scenario: A large program is segmented into different modules. How does the 8086 handle jumps between segments?
c) Using a far jump
Scenario: You need to calculate the effective address in a complex addressing mode that uses both base and index registers. Which registers are involved?
b) BX and SI
In 8086, the segment registers are used to manage memory segmentation. Which of the following is NOT a segment register?
a) CS
b) DS
c) SS
d) PC
d) PC
In the 8086 architecture, the Execution Unit (EU) is primarily responsible for which of the following?
a) Fetching instructions
b) Decoding instructions
c) Executing instructions
d) Storing results in memory
c) Executing instructions
If the CS register is set to 5000H and the IP is 2000H, what is the physical address of the next instruction to be fetched?
a) 52000H
b) 7000H
c) 5200H
d) 5000H
a) 52000H
In 8086, the instruction queue holds up to 6 bytes. What is the purpose of this queue?
a) To store operands
b) To store flags
c) To prefetch instructions
d) To manage interrupts
c) To prefetch instructions
Which unit in 8086 is responsible for generating the physical address?
a) Execution Unit (EU)
b) Bus Interface Unit (BIU)
c) Control Unit
d) Arithmetic Logic Unit (ALU)
b) Bus Interface Unit (BIU)
In the 8086, the Overflow Flag (OF) is set when:
a) There is a carry out from the most significant bit
b) The result of a signed operation is out of range
c) The result has an even number of 1s
d) The result is zero
b) The result of a signed operation is out of range
Which register is used by the 8086 microprocessor to access data from the stack?
a) IP
b) SP
c) DX
d) AX
b) SP
Which register in the 8086 is specifically used to store the offset of a data segment?
a) SS
b) DS
c) ES
d) SP
b) DS