Computer Organization: Binary, Interrupts, Polling
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Questions and Answers

What is an interrupt? Choose the most appropriate answer.

  • A signal that a peripheral device sends to the CPU to indicate that it is ready to transfer data.
  • A signal that is generated when a peripheral device requires attention from the CPU. (correct)
  • A signal that the CPU sends to a peripheral device to indicate a task completion.
  • A signal that the CPU sends to the peripheral device to indicate a data transfer error.
  • What is the role of the interrupt register (IR)?

  • To store the address of the current executing program.
  • To store the address of the interrupt handler for a specific interrupt. (correct)
  • To store the priority of specific interrupts.
  • To store the status of the CPU.
  • Which of the following statements about polling is TRUE?

  • Polling is a very efficient way to manage CPU resources.
  • Polling is a common technique for managing interrupts. (correct)
  • Polling requires minimal communication overhead.
  • Polling relies on the CPU being idle to work properly.
  • Which of these correctly describes the role of a buffer in a computer system?

    <p>A buffer is a temporary storage area used to synchronize data transfer between devices with different speeds. (C)</p> Signup and view all the answers

    Which of these statements about handshaking is TRUE?

    <p>Handshaking is a technique for identifying and authenticating devices before data transfer. (C)</p> Signup and view all the answers

    What is the basic unit of information in computer systems?

    <p>Bit (A)</p> Signup and view all the answers

    How many bits make up a byte?

    <p>8 (D)</p> Signup and view all the answers

    What is the purpose of an interrupt?

    <p>To allow the CPU to temporarily pause its current task and handle a higher priority task (B)</p> Signup and view all the answers

    What is the relationship between a byte and a character?

    <p>A byte can store a single character (A)</p> Signup and view all the answers

    Which of these is NOT a common use for bytes?

    <p>Measuring the processing power of a CPU (B)</p> Signup and view all the answers

    What are control systems primarily designed to do?

    <p>Guide devices or systems without human intervention (B)</p> Signup and view all the answers

    Which statement best describes the functionality of sensors in a control system?

    <p>They provide feedback by detecting motion or presence (B)</p> Signup and view all the answers

    What is a characteristic feature of automatic doors as part of a control system?

    <p>They can detect motion before acting (D)</p> Signup and view all the answers

    Which operating system is based on the Linux kernel and designed for embedded systems?

    <p>Tizen (C)</p> Signup and view all the answers

    What type of operating system is eCos designed to support?

    <p>Real-time applications in embedded systems (B)</p> Signup and view all the answers

    What is the primary goal of multiprogramming?

    <p>To minimize CPU idle time. (A)</p> Signup and view all the answers

    How does multitasking differ from multiprogramming?

    <p>Multitasking focuses on smaller tasks rather than whole programs. (D)</p> Signup and view all the answers

    Which term describes the ability for a program to execute different parts simultaneously?

    <p>Multithreading (D)</p> Signup and view all the answers

    What is the relationship between paging and virtual memory?

    <p>Paging allows secondary storage to be utilized as if it were RAM. (B)</p> Signup and view all the answers

    What does the term 'swapping' refer to in operating systems?

    <p>Temporarily moving processes or program code between RAM and disk. (A)</p> Signup and view all the answers

    Which statement correctly describes multiprocessing?

    <p>It entails having multiple CPU cores within a computer system. (C)</p> Signup and view all the answers

    What problem can excessive page swapping cause in an operating system?

    <p>Thrashing, leading to poor system performance. (B)</p> Signup and view all the answers

    What is the characteristic feature of TinyOS?

    <p>It is an embedded OS designed for low-power devices. (D)</p> Signup and view all the answers

    What is the primary purpose of virtual machines?

    <p>To provide a software emulation of other operating systems (D)</p> Signup and view all the answers

    Which feature does NOT impact the speed of processors?

    <p>Operating System (D)</p> Signup and view all the answers

    What is a key requirement for effective Voice over IP (VoIP) performance?

    <p>Low internet latency (D)</p> Signup and view all the answers

    Which type of RAM continuously leaks data and needs periodic refreshing?

    <p>Dynamic RAM (DRAM) (B)</p> Signup and view all the answers

    What is the function of the operating system regarding memory management in multitasking?

    <p>To allocate separate memory for each program (C)</p> Signup and view all the answers

    What is a disadvantage of using normal routers for VoIP?

    <p>They do not prioritize VoIP traffic effectively (D)</p> Signup and view all the answers

    What does ROM typically store?

    <p>Critical instructions for booting the computer (C)</p> Signup and view all the answers

    What occurs during paging in operating systems?

    <p>Pages of memory are written to secondary storage (A)</p> Signup and view all the answers

    Which factor is NOT a system resource managed by an operating system?

    <p>User preferences (A)</p> Signup and view all the answers

    What defines batch processing in computing?

    <p>Executing a group of programs without user intervention (D)</p> Signup and view all the answers

    What is a major benefit of virtual machines in software testing?

    <p>They enable testing across different platforms economically (D)</p> Signup and view all the answers

    What characteristic of SRAM makes it suitable for placement between the processor and DRAM?

    <p>Higher speed compared to DRAM (B)</p> Signup and view all the answers

    Why is high bandwidth crucial for VoIP performance?

    <p>It directly influences the quality of streaming (C)</p> Signup and view all the answers

    Which feature most significantly impacts the multitasking capabilities of an operating system?

    <p>The allocation of time slices for processes (D)</p> Signup and view all the answers

    Flashcards

    Interrupt Handling

    The process by which the CPU responds to an interrupt signal from a client or device.

    Interrupt Register (IR)

    A memory location used to detect the specific interrupt-handling code.

    Polling

    A technique where one unit checks the status of another at regular intervals.

    Handshaking

    The exchange of signals between devices to confirm readiness for data exchange.

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    Buffer

    A temporary data storage area for devices that process data at different speeds.

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    Tizen

    An operating system based on the Linux kernel and GNU C Library.

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    eCos

    A free, open-source, real-time OS for embedded systems that supports multiple threads.

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    Control System

    A system that manages and guides devices automatically without human intervention.

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    Sensors in Control Systems

    Devices that provide feedback to control systems to help manage actuators.

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    Automatic Doors Example

    A control system that opens doors based on sensor feedback to detect motion.

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    Bit

    The basic unit of information in computer systems, representing a value of 1 or 0.

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    Byte

    A group of 8 bits that can represent a single character.

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    Binary

    A number system that uses only two digits: 0 and 1.

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    Decimal

    The standard numerical system using ten digits (0-9).

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    Interrupt

    A signal to the CPU to temporarily suspend a task for a higher-priority one.

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    Batch Processing

    A method where one program runs at a time, completing before the next begins.

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    Multiprogramming

    Multiple programs are loaded in memory, but only one is executed by the CPU at a time.

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    Multitasking

    Simultaneous execution of tasks that share a CPU, completing quickly.

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    Multiprocessing

    A system with more than one CPU core, allowing for concurrent processing.

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    Multithreading

    Ability of a program to execute multiple threads simultaneously without interference.

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    Swapping

    Transferring processes out of RAM to hard disk temporarily for execution management.

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    Paging

    Mechanism allowing a system to use secondary storage as if it were RAM.

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    Thrashing

    Excessive page swapping leading to poor system performance.

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    Virtual Memory

    Use of secondary memory to enhance primary memory.

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    Processor Speed Factors

    Features like word length, bus size, and cores that affect CPU speed.

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    Virtual Machines

    Software emulations of operating systems that abstract the host environment.

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    VoIP Requirements

    Utilizes high bandwidth, powerful routers, and stable networks for audio/video streaming.

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    Bandwidth Impact

    Quality of VoIP calls depends on available bandwidth and usage.

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    OS Functions in Multitasking

    Manages memory and processors to allow multiple programs to run concurrently.

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    Primary Memory

    Holds processed data and instructions that the CPU uses directly.

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    RAM

    Volatile memory where data can be read or written while powered.

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    Static RAM (SRAM)

    Type of RAM that retains data as long as power is supplied, faster but more expensive.

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    Dynamic RAM (DRAM)

    Type of RAM that needs periodic refreshing to retain data.

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    Read Only Memory (ROM)

    Non-volatile memory holding critical instructions for startup.

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    Secondary Storage

    Permanent data storage with mass capacity, ensuring data integrity.

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    Processor Management

    OS function assigning time slices for process execution.

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    Memory Isolation

    Ensures each process has its memory space to prevent interference.

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    Study Notes

    Computer Organization - Binary Representation

    • All data and instructions in computer systems are stored as binary digits (bits), which have values of 1 or 0.
    • Eight bits form a byte.
    • Bytes are used to represent characters, file sizes (e.g., 12MB), and connection speeds (e.g., 50Mbps).

    Interrupt

    • Allows a higher-priority task to interrupt a current CPU job temporarily.
    • Can be triggered by hardware or software.
    • Used to signal that a client needs access to a server in a multi-access system.
    • Used to signal a peripheral needing service (e.g., printer).
    • Used to signal software errors or problems (e.g., low battery).
    • CPU handles interrupts by suspending current tasks, activating an interrupt handler, and servicing the interrupt request.
    • An interrupt register (IR) stores the location of the interrupt-handling code in memory.

    Polling

    • A technique that allows a unit to check the status of another unit at regular intervals.
    • Efficient use of CPU time when CPU is not busy.

    Handshaking

    • The exchange of signals/messages between devices to confirm readiness for data exchange.
    • Devices use signals to establish parameters, protocols, and certificates for data transmission.

    Buffer

    • Temporarily holds data to compensate for speed differences between devices.
    • Peripherals are often slower than the CPU.
    • The buffer allows the CPU to complete other tasks while the peripheral processes the data.

    Paging

    • A memory management technique used in virtual memory.
    • Divides memory into pages which can be swapped between RAM and secondary storage.
    • Improves the effective amount of RAM by allowing programs larger than RAM to be run.

    Virtual Machines

    • Emulate other operating systems, hiding the host machine's environment.
    • Allow software to be executed on different platforms (portability).
    • More practical and cost-effective than testing software on multiple physical machines.

    Voice over IP (VoIP)

    • Audio (and potentially video) transmitted over the internet.
    • Requires broadband internet connection.
    • Can be integrated with office computers, collaborative devices (webcams, desk endpoints), and phones.
    • Resources include bandwidth (and quality considerations).
    • Routers must be capable of handling VoIP traffic for optimal performance.

    Memory Management

    • Operating systems (OS) allow multiple programs to share memory by assigning separate memory areas to each.
    • OS manages memory isolation for each program to avoid conflicts.
    • Paging can occur if shared memory storage gets full.
    • CPU management prioritizes tasks for efficient use.

    Primary Memory (RAM)

    • Stores data and instructions active in a computer.
    • Directly connected and communicates with the processor.
    • Includes RAM (static and dynamic), and cache.
    • Enables the fetch, decode, and execute CPU cycle.

    Secondary Storage

    • Provides affordable, mass-storage permanence for data that doesn't need constant access.
    • Types include direct and sequential access.

    Batch Processing

    • Executing multiple programs together as a group.
    • Programs wait in sequence to be executed.
    • No user interaction during processing.
    • Can be inefficient and not suited for all applications.

    Multiprogramming

    • Running multiple programs concurrently, but only executing one at a time.
    • Minimizes CPU idle time, improves system utilization.

    Multitasking

    • Similar to multiprogramming, but tasks are smaller and completed quickly.
    • Uses CPU time-sharing.

    Multiprocessing

    • Using multiple CPUs to execute tasks simultaneously.
    • Improves processing speed and performance on complex tasks.

    Multithreading

    • Allows a program to execute several parts concurrently (called threads).
    • Avoids thread interference.

    Swapping

    • Technique of temporarily moving code from RAM to secondary storage.
    • Allows more programs/processes to be in RAM than the physical memory allows.
    • Can result in less efficient operations.

    Paging

    • Mechanism that implements virtual memory.
    • Allows modern OS to use secondary storage as if it were additional RAM.
    • Excessive paging (swapping) causes inefficiencies and performance issues.

    Control Systems

    • Device systems that operate automatically.
    • Includes sensors for feedback information and actuators for control.
    • Examples include door openers, and other automated systems.

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    Description

    This quiz covers fundamental concepts in computer organization, including binary representation, interrupts, and polling techniques. Test your understanding of how data is stored in binary, how CPU prioritizes tasks through interrupts, and how polling is used for efficient resource management.

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