I/O Mapping (Memory-Mapped I/O, Isolated I/O) MCQs

1. What is the primary characteristic of Memory-Mapped I/O?

(A) Devices are accessed through separate I/O instructions

(B) Devices are accessed using the same address space as memory

(C) It requires additional hardware for I/O operations

(D) It uses interrupt-driven I/O exclusively

2. How does Isolated I/O differ from Memory-Mapped I/O?

(A) Isolated I/O is more efficient than Memory-Mapped I/O

(B) Isolated I/O requires the use of memory-mapped addresses

(C) Isolated I/O uses separate address spaces for I/O devices and memory, while Memory-Mapped I/O uses the same address space

(D) Isolated I/O handles I/O operations without requiring I/O instructions

3. What is a key advantage of using Memory-Mapped I/O?

(A) It simplifies programming by allowing I/O devices to be accessed using standard memory instructions

(B) It increases the number of required I/O instructions

(C) It separates memory access from I/O access

(D) It requires additional hardware support

4. Which instruction type is used in Isolated I/O to communicate with devices?

(A) Control instructions

(B) Standard memory instructions

(C) Arithmetic instructions

(D) Special I/O instructions

5. In Memory-Mapped I/O, how are I/O devices treated by the CPU?

(A) As separate entities requiring distinct I/O instructions

(B) As if they are memory locations

(C) Through dedicated I/O ports

(D) Using dedicated interrupts

6. What is the main disadvantage of Isolated I/O compared to Memory-Mapped I/O?

(A) It reduces the number of required instructions

(B) It simplifies the addressing of devices

(C) It requires separate instructions for I/O operations, increasing complexity

(D) It uses the same address space as memory

7. Which type of I/O mapping allows the use of standard memory read and write instructions for device access?

(A) Direct Memory Access (DMA)

(B) Isolated I/O

(C) Memory-Mapped I/O

(D) Programmed I/O

8. What is one key feature of Isolated I/O?

(A) It reduces the complexity of I/O operations

(B) It allows devices to be accessed through standard memory instructions

(C) It shares the address space with memory

(D) It uses a different set of instructions for I/O operations compared to memory operations

9. In which I/O mapping method are I/O devices and memory addresses completely separated?

(A) Memory-Mapped I/O

(B) Isolated I/O

(C) Direct Memory Access (DMA)

(D) Interrupt-driven I/O

10. How does Memory-Mapped I/O impact the complexity of device programming?

(A) It increases complexity by requiring special I/O instructions

(B) It reduces complexity by using standard memory access instructions for device communication

(C) It requires more hardware for device communication

(D) It involves frequent interrupts for I/O operations

11. Which method allows the CPU to use the same address space for both memory and I/O devices?

(A) Programmed I/O

(B) Isolated I/O

(C) Direct Memory Access (DMA)

(D) Memory-Mapped I/O

12. What is the main advantage of Isolated I/O?

(A) It simplifies the use of standard memory instructions

(B) It allows for more controlled and separate management of I/O and memory operations

(C) It reduces the number of required I/O instructions

(D) It merges memory and I/O address spaces

13. In which I/O mapping technique are special I/O instructions used to access I/O devices?

(A) Isolated I/O

(B) Memory-Mapped I/O

(C) Direct Memory Access (DMA)

(D) Interrupt-driven I/O

14. What does Memory-Mapped I/O use for device communication?

(A) The same address space as system memory

(B) A separate set of I/O ports

(C) Special I/O instructions

(D) Dedicated hardware for I/O operations

15. Which I/O mapping method allows for simpler device programming by using memory access instructions?

(A) Direct Memory Access (DMA)

(B) Isolated I/O

(C) Memory-Mapped I/O

(D) Programmed I/O

16. How does Isolated I/O handle the interaction between CPU and I/O devices?

(A) By integrating I/O devices within the memory address space

(B) By using distinct I/O instructions and address spaces

(C) By using standard memory access instructions

(D) By managing all interactions through interrupts

17. Which I/O mapping technique is typically used when devices are treated like memory locations?

(A) Programmed I/O

(B) Isolated I/O

(C) Direct Memory Access (DMA)

(D) Memory-Mapped I/O

18. What is a key benefit of Isolated I/O in terms of system design?

(A) It simplifies the use of standard memory instructions

(B) It allows for separate, controlled handling of I/O and memory operations

(C) It integrates I/O devices directly into memory address space

(D) It reduces the number of I/O instructions required

19. In which I/O mapping approach are I/O devices accessed through a unified memory address space?

(A) Direct Memory Access (DMA)

(B) Isolated I/O

(C) Memory-Mapped I/O

(D) Interrupt-driven I/O

20. Which method allows for the use of dedicated I/O instructions for device communication?

(A) Programmed I/O

(B) Memory-Mapped I/O

(C) Direct Memory Access (DMA)

(D) Isolated I/O

21. What is one disadvantage of using Memory-Mapped I/O?

(A) It requires additional I/O instructions

(B) It can lead to address space conflicts if not managed properly

(C) It increases the number of I/O interrupts

(D) It necessitates separate handling of memory and I/O operations

22. How does Isolated I/O manage the addresses of I/O devices?

(A) By integrating I/O devices into the memory address space

(B) By assigning a separate address space distinct from memory

(C) By using the same address space as memory

(D) By requiring constant polling of I/O devices

23. What type of instructions are used for Memory-Mapped I/O operations?

(A) Special I/O instructions

(B) Standard memory access instructions

(C) Arithmetic instructions

(D) Control instructions

24. Which I/O mapping method requires that memory and I/O operations be handled separately?

(A) Isolated I/O

(B) Direct Memory Access (DMA)

(C) Memory-Mapped I/O

(D) Interrupt-driven I/O

25. What is a primary benefit of using Memory-Mapped I/O in a system?

(A) It increases the number of I/O instructions required

(B) It requires separate handling for I/O operations

(C) It allows I/O devices to be accessed as if they were memory locations, simplifying programming

(D) It mandates the use of special I/O instructions

26. Which method provides a clear separation between I/O and memory addresses?

(A) Direct Memory Access (DMA)

(B) Isolated I/O

(C) Memory-Mapped I/O

(D) Programmed I/O

27. How does Isolated I/O impact programming complexity?

(A) It simplifies the integration of I/O devices within the memory address space

(B) It reduces complexity by using standard memory instructions

(C) It increases complexity by requiring distinct I/O instructions and address spaces

(D) It eliminates the need for I/O instructions

28. What is the key advantage of using Isolated I/O for device communication?

(A) It simplifies the use of memory instructions for device access

(B) It provides controlled access by using separate address spaces and instructions for I/O devices

(C) It integrates I/O devices into the memory address space

(D) It requires fewer I/O instructions

29. Which I/O mapping technique allows devices to be accessed using the same instructions as memory operations?

(A) Programmed I/O

(B) Isolated I/O

(C) Direct Memory Access (DMA)

(D) Memory-Mapped I/O

30. What is the primary disadvantage of Memory-Mapped I/O?

(A) It simplifies programming by using standard memory instructions

(B) It can cause address space conflicts if not managed properly

(C) It reduces the number of required I/O instructions

(D) It requires additional hardware for implementation

31. How does Isolated I/O handle I/O operations in comparison to Memory-Mapped I/O?

(A) By using the same instructions for both memory and I/O operations

(B) By integrating I/O operations within the memory address space

(C) By using a separate set of instructions and address spaces for I/O operations

(D) By reducing the number of I/O instructions required

32. What does Memory-Mapped I/O use to access I/O devices?

(A) A distinct set of I/O instructions and address space

(B) The same memory address space used for system memory

(C) Separate hardware controllers

(D) Special interrupt routines

33. Which method involves using special instructions to perform I/O operations?

(A) Isolated I/O

(B) Memory-Mapped I/O

(C) Direct Memory Access (DMA)

(D) Programmed I/O

34. What is one of the primary uses of Memory-Mapped I/O?

(A) To require constant polling of I/O devices

(B) To separate memory and I/O operations distinctly

(C) To use dedicated hardware for I/O operations

(D) To simplify device access by treating I/O devices as memory locations

35. In which method are I/O devices and memory operations completely separated?

(A) Direct Memory Access (DMA)

(B) Memory-Mapped I/O

(C) Isolated I/O

(D) Interrupt-driven I/O

36. How does Memory-Mapped I/O simplify system design?

(A) By requiring more frequent interrupts

(B) By requiring separate address spaces and instructions for memory and I/O

(C) By increasing the complexity of I/O management

(D) By using standard memory access instructions for both memory and I/O devices

37. What does Isolated I/O provide in terms of address space management?

(A) Integration of I/O devices into the memory address space

(B) A dedicated address space for I/O devices separate from memory

(C) Simplified access using memory instructions

(D) Reduced number of I/O instructions

38. What is a key characteristic of Memory-Mapped I/O regarding device access?

(A) Devices are accessed using memory addresses rather than special I/O instructions

(B) Devices require special I/O instructions and address spaces

(C) It uses direct memory access for all I/O operations

(D) It simplifies interrupt handling

39. Which I/O mapping technique simplifies programming by integrating device access with memory operations?

(A) Memory-Mapped I/O

(B) Isolated I/O

(C) Direct Memory Access (DMA)

(D) Programmed I/O

40. What is the primary function of Isolated I/O in an I/O system?

(A) To reduce the complexity of I/O operations

(B) To use the same address space for memory and I/O operations

(C) To handle device communication using memory instructions

(D) To provide separate instructions and address spaces for I/O operations