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

What is the primary characteristic of Memory-Mapped I/O?
a) Devices are accessed using the same address space as memory
b) Devices are accessed through separate I/O instructions
c) It requires additional hardware for I/O operations
d) It uses interrupt-driven I/O exclusively
Answer: a) Devices are accessed using the same address space as memory

How does Isolated I/O differ from Memory-Mapped I/O?
a) Isolated I/O uses separate address spaces for I/O devices and memory, while Memory-Mapped I/O uses the same address space
b) Isolated I/O requires the use of memory-mapped addresses
c) Isolated I/O is more efficient than Memory-Mapped I/O
d) Isolated I/O handles I/O operations without requiring I/O instructions
Answer: a) Isolated I/O uses separate address spaces for I/O devices and memory, while Memory-Mapped I/O uses the same address space

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
Answer: a) It simplifies programming by allowing I/O devices to be accessed using standard memory instructions

Which instruction type is used in Isolated I/O to communicate with devices?
a) Special I/O instructions
b) Standard memory instructions
c) Arithmetic instructions
d) Control instructions
Answer: a) Special I/O instructions

In Memory-Mapped I/O, how are I/O devices treated by the CPU?
a) As if they are memory locations
b) As separate entities requiring distinct I/O instructions
c) Through dedicated I/O ports
d) Using dedicated interrupts
Answer: a) As if they are memory locations

What is the main disadvantage of Isolated I/O compared to Memory-Mapped I/O?
a) It requires separate instructions for I/O operations, increasing complexity
b) It simplifies the addressing of devices
c) It reduces the number of required instructions
d) It uses the same address space as memory
Answer: a) It requires separate instructions for I/O operations, increasing complexity

Which type of I/O mapping allows the use of standard memory read and write instructions for device access?
a) Memory-Mapped I/O
b) Isolated I/O
c) Direct Memory Access (DMA)
d) Programmed I/O
Answer: a) Memory-Mapped I/O

What is one key feature of Isolated I/O?
a) It uses a different set of instructions for I/O operations compared to memory operations
b) It allows devices to be accessed through standard memory instructions
c) It shares the address space with memory
d) It reduces the complexity of I/O operations
Answer: a) It uses a different set of instructions for I/O operations compared to memory operations

In which I/O mapping method are I/O devices and memory addresses completely separated?
a) Isolated I/O
b) Memory-Mapped I/O
c) Direct Memory Access (DMA)
d) Interrupt-driven I/O
Answer: a) Isolated I/O

How does Memory-Mapped I/O impact the complexity of device programming?
a) It reduces complexity by using standard memory access instructions for device communication
b) It increases complexity by requiring special I/O instructions
c) It requires more hardware for device communication
d) It involves frequent interrupts for I/O operations
Answer: a) It reduces complexity by using standard memory access instructions for device communication

Which method allows the CPU to use the same address space for both memory and I/O devices?
a) Memory-Mapped I/O
b) Isolated I/O
c) Direct Memory Access (DMA)
d) Programmed I/O
Answer: a) Memory-Mapped I/O

What is the main advantage of Isolated I/O?
a) It allows for more controlled and separate management of I/O and memory operations
b) It simplifies the use of standard memory instructions
c) It reduces the number of required I/O instructions
d) It merges memory and I/O address spaces
Answer: a) It allows for more controlled and separate management of I/O and memory operations

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
Answer: a) Isolated I/O

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
Answer: a) The same address space as system memory

Which I/O mapping method allows for simpler device programming by using memory access instructions?
a) Memory-Mapped I/O
b) Isolated I/O
c) Direct Memory Access (DMA)
d) Programmed I/O
Answer: a) Memory-Mapped I/O

How does Isolated I/O handle the interaction between CPU and I/O devices?
a) By using distinct I/O instructions and address spaces
b) By integrating I/O devices within the memory address space
c) By using standard memory access instructions
d) By managing all interactions through interrupts
Answer: a) By using distinct I/O instructions and address spaces

Which I/O mapping technique is typically used when devices are treated like memory locations?
a) Memory-Mapped I/O
b) Isolated I/O
c) Direct Memory Access (DMA)
d) Programmed I/O
Answer: a) Memory-Mapped I/O

What is a key benefit of Isolated I/O in terms of system design?
a) It allows for separate, controlled handling of I/O and memory operations
b) It simplifies the use of standard memory instructions
c) It integrates I/O devices directly into memory address space
d) It reduces the number of I/O instructions required
Answer: a) It allows for separate, controlled handling of I/O and memory operations

In which I/O mapping approach are I/O devices accessed through a unified memory address space?
a) Memory-Mapped I/O
b) Isolated I/O
c) Direct Memory Access (DMA)
d) Interrupt-driven I/O
Answer: a) Memory-Mapped I/O

Which method allows for the use of dedicated I/O instructions for device communication?
a) Isolated I/O
b) Memory-Mapped I/O
c) Direct Memory Access (DMA)
d) Programmed I/O
Answer: a) Isolated I/O

What is one disadvantage of using Memory-Mapped I/O?
a) It can lead to address space conflicts if not managed properly
b) It requires additional I/O instructions
c) It increases the number of I/O interrupts
d) It necessitates separate handling of memory and I/O operations
Answer: a) It can lead to address space conflicts if not managed properly

How does Isolated I/O manage the addresses of I/O devices?
a) By assigning a separate address space distinct from memory
b) By integrating I/O devices into the memory address space
c) By using the same address space as memory
d) By requiring constant polling of I/O devices
Answer: a) By assigning a separate address space distinct from memory

What type of instructions are used for Memory-Mapped I/O operations?
a) Standard memory access instructions
b) Special I/O instructions
c) Arithmetic instructions
d) Control instructions
Answer: a) Standard memory access instructions

Which I/O mapping method requires that memory and I/O operations be handled separately?
a) Isolated I/O
b) Memory-Mapped I/O
c) Direct Memory Access (DMA)
d) Interrupt-driven I/O
Answer: a) Isolated I/O

What is a primary benefit of using Memory-Mapped I/O in a system?
a) It allows I/O devices to be accessed as if they were memory locations, simplifying programming
b) It requires separate handling for I/O operations
c) It increases the number of I/O instructions required
d) It mandates the use of special I/O instructions
Answer: a) It allows I/O devices to be accessed as if they were memory locations, simplifying programming

Which method provides a clear separation between I/O and memory addresses?
a) Isolated I/O
b) Memory-Mapped I/O
c) Direct Memory Access (DMA)
d) Programmed I/O
Answer: a) Isolated I/O

How does Isolated I/O impact programming complexity?
a) It increases complexity by requiring distinct I/O instructions and address spaces
b) It reduces complexity by using standard memory instructions
c) It simplifies the integration of I/O devices within the memory address space
d) It eliminates the need for I/O instructions
Answer: a) It increases complexity by requiring distinct I/O instructions and address spaces

What is the key advantage of using Isolated I/O for device communication?
a) It provides controlled access by using separate address spaces and instructions for I/O devices
b) It simplifies the use of memory instructions for device access
c) It integrates I/O devices into the memory address space
d) It requires fewer I/O instructions
Answer: a) It provides controlled access by using separate address spaces and instructions for I/O devices

Which I/O mapping technique allows devices to be accessed using the same instructions as memory operations?
a) Memory-Mapped I/O
b) Isolated I/O
c) Direct Memory Access (DMA)
d) Programmed I/O
Answer: a) Memory-Mapped I/O

What is the primary disadvantage of Memory-Mapped I/O?
a) It can cause address space conflicts if not managed properly
b) It simplifies programming by using standard memory instructions
c) It reduces the number of required I/O instructions
d) It requires additional hardware for implementation
Answer: a) It can cause address space conflicts if not managed properly

How does Isolated I/O handle I/O operations in comparison to Memory-Mapped I/O?
a) By using a separate set of instructions and address spaces for I/O operations
b) By integrating I/O operations within the memory address space
c) By using the same instructions for both memory and I/O operations
d) By reducing the number of I/O instructions required
Answer: a) By using a separate set of instructions and address spaces for I/O operations

What does Memory-Mapped I/O use to access I/O devices?
a) The same memory address space used for system memory
b) A distinct set of I/O instructions and address space
c) Separate hardware controllers
d) Special interrupt routines
Answer: a) The same memory address space used for system memory

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
Answer: a) Isolated I/O

What is one of the primary uses of Memory-Mapped I/O?
a) To simplify device access by treating I/O devices as memory locations
b) To separate memory and I/O operations distinctly
c) To use dedicated hardware for I/O operations
d) To require constant polling of I/O devices
Answer: a) To simplify device access by treating I/O devices as memory locations

In which method are I/O devices and memory operations completely separated?
a) Isolated I/O
b) Memory-Mapped I/O
c) Direct Memory Access (DMA)
d) Interrupt-driven I/O
Answer: a) Isolated I/O

How does Memory-Mapped I/O simplify system design?
a) By using standard memory access instructions for both memory and I/O devices
b) By requiring separate address spaces and instructions for memory and I/O
c) By increasing the complexity of I/O management
d) By requiring more frequent interrupts
Answer: a) By using standard memory access instructions for both memory and I/O devices

What does Isolated I/O provide in terms of address space management?
a) A dedicated address space for I/O devices separate from memory
b) Integration of I/O devices into the memory address space
c) Simplified access using memory instructions
d) Reduced number of I/O instructions
Answer: a) A dedicated address space for I/O devices separate from memory

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
Answer: a) Devices are accessed using memory addresses rather than special I/O instructions

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
Answer: a) Memory-Mapped I/O

What is the primary function of Isolated I/O in an I/O system?
a) To provide separate instructions and address spaces for 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 reduce the complexity of I/O operations
Answer: a) To provide separate instructions and address spaces for I/O operations

Which I/O mapping method requires the CPU to use different instructions for memory and I/O operations?
a) Isolated I/O
b) Memory-Mapped I/O
c) Direct Memory Access (DMA)
d) Interrupt-driven I/O
Answer: a) Isolated I/O

How does Memory-Mapped I/O affect system performance?
a) By using standard memory instructions, which can simplify programming and potentially improve performance
b) By requiring more complex instructions for I/O operations
c) By increasing the need for separate I/O hardware
d) By requiring frequent polling of I/O devices
Answer: a) By using standard memory instructions, which can simplify programming and potentially improve performance

I/O Mapping (Memory-Mapped I/O, Isolated I/O) MCQs
By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 20, 2024

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