8086 Microprocessor Quiz

The 8086 microprocessor is executing a program, and the next instruction to be executed is located at memory address 4000H. The BIU is responsible for fetching this instruction. If the Instruction Pointer (IP) is currently at 3FFEH and the Code Segment (CS) register holds the value 2000H, what will be the next value of IP after the BIU fetches the instruction?

• 4000H

• 3FFFH

• 0000H

• 3FFEH

The EU needs to access data located at a memory address calculated as CS

+ displacement. If the CS register is set to 3000H, the IP register is 1234H, and the displacement is 0020H, what role does the BIU play in this process?

A. The BIU calculates the effective address and directly fetches the data from memory.
B. The BIU sends the values to the EU for address calculation.
C. The EU calculates the address and instructs the BIU to fetch the data.
D. The EU and BIU jointly calculate the address and fetch the data.

• A

• B

• C

• D

During the execution of a program, the EU encounters an instruction that requires reading from a memory location. After the BIU fetches the instruction and any required operands, what does the EU do next?

A. It immediately executes the instruction without any further communication with the BIU.
B. It waits for the BIU to decode the instruction and then proceeds with execution.
C. It decodes the instruction, executes it, and stores the result if necessary.
D. It hands over control back to the BIU to perform the execution.

• A

• B

• C

• D

An 8086 microprocessor program needs to access data located in a different segment than the default Data Segment (DS). The program must temporarily switch to a new segment using a different segment register and then restore the original DS. Which segment register would typically be used to access the new segment without altering the DS?

A. SS
B. ES
C. CS
D. BP

• A

• B

• C

• D

A microprocessor employs a technique where it begins executing a new instruction before the previous instruction has completed. What is this technique called, and what is its primary benefit?

A. Multithreading; Increases the number of threads
B. Pipelining; Improves instruction throughput
C. Hyperthreading; Enhances parallelism
D. Branch Prediction; Reduces the number of branches

• A

• B

• C

• D

In an 8086 microprocessor, a programmer wants to access a specific memory location using the DS (Data Segment) register and the BX register as the offset. If the DS register contains the value 3000H and BX contains 0040H, what is the physical address that will be accessed?

A. 30040H
B. 3004H
C. 30040H
D. 34000H

• A

• B

• C

• D

An 8086 program needs to handle large data sets that exceed the size of a single segment (64 KB). How can the program effectively manage these large data sets using segmentation?

A. Increase the segment size
B. Use multiple segments and switch between them
C. Reduce the data set size
D. Use the same segment for all data

• A

• B

• C

• D

A program in the 8086 microprocessor needs to jump to a location within the same code segment. What type of jump should be used to perform this operation efficiently, and how does it differ from a far jump?

A. Far Jump; Uses segment and offset
B. Near Jump; Uses only offset
C. Near Jump; Uses segment and offset
D. Far Jump; Uses only offset

• A

• B

• C

• D

A program requires that the code segment and data segment be different to access separate code and data regions. If the code segment is set to 2000H and the data segment to 3000H, how will the program handle memory addressing?

A. The program will use the same base address for code and data.
B. The program will use separate base addresses for code and data with their respective offsets.
C. The program will need to use the same segment register for both code and data.
D. The program will combine code and data segments into one segment.

• A

• B

• C

• D

After executing the instruction SUB AX, BX with AX = 5000H and BX = 6000H, what will be the state of the Carry Flag (CF)?

A. CF will be set (1).
B. CF will be cleared (0).
C. CF will be undefined.
D. CF will be set if the result is negative.

• A

• B

• C

• D