External Devices and Input/Output Functions Quiz
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Questions and Answers

Which category of external devices is suitable for communicating with the computer user?

  • Communication
  • Human readable (correct)
  • Machine readable
  • Input / Output

    • What is the major function of an I/O module related to device communication?

  • Error detection
  • Control and timing
  • Processor communication (correct)
  • Data buffering

    • In the context of input/output, what is the function of a transducer in a keyboard?

  • Interpret IRA code
  • Translate bit pattern
  • Generate electronic signal (correct)
  • Transmit to I/O module

    • Which category of external devices is suitable for communicating with remote devices?

    <p>Communication</p> Signup and view all the answers

    What type of signal is generated when a user depresses a key on a keyboard?

    <p>Electronic signal</p> Signup and view all the answers

    What category of external devices is suitable for storing data in IRA code?

    <p>Machine readable</p> Signup and view all the answers

    What does the Interrupt driven I/O technique allow the processor to do?

    <p>Execute other instructions while the I/O operation is in progress</p> Signup and view all the answers

    What is the main drawback of the Programmed I/O technique?

    <p>The processor must wait until the I/O operation is complete</p> Signup and view all the answers

    What does an I/O Device Controller handle?

    <p>Management of low-level device operations</p> Signup and view all the answers

    What distinguishes Direct Memory Access (DMA) from programmed and interrupt I/O techniques?

    <p>I/O module exchanging data directly with main memory without processor involvement</p> Signup and view all the answers

    What type of commands may an I/O module receive when addressed by a processor?

    <p>Peripheral activation and testing commands</p> Signup and view all the answers

    What does Memory Mapped I/O have in common with memory?

    <p>Devices and memory share an address space</p> Signup and view all the answers

    What distinguishes Isolated I/O from Memory Mapped I/O?

    <p>Separate address spaces for I/O and memory</p> Signup and view all the answers

    Processor communication consists of involves command decoding, data, status reporting, and ______ recognition

    <p>address</p> Signup and view all the answers

    Provide the Block diagram of an ______ module

    <p>I/O</p> Signup and view all the answers

    Make a distinction between I/O channel (I/O Processor) and I/O – device – ______

    <p>controller</p> Signup and view all the answers

    Explain briefly the Programmed I/O ______

    <p>technique</p> Signup and view all the answers

    Explain briefly the Interrupt driven I/O ______

    <p>technique</p> Signup and view all the answers

    Explain briefly the Direct memory Access I/O ______

    <p>technique</p> Signup and view all the answers

    List the common I/O commands that an I/O module may receive when it is addressed by a ______

    <p>processor</p> Signup and view all the answers

    Make a difference between memory mapped I/O and isolated modes of addressing an I/O in programmed I/O ______

    <p>context</p> Signup and view all the answers

    Memory mapped I/O Devices and memory share an address space I/O looks just like memory read/write No special commands for I/O Large selection of memory access commands available Isolated ______ Separate address spaces Need I/O or memory

    <p>sel</p> Signup and view all the answers

    With both programmed and interrupt I/O, the processor is responsible for extracting data from main memory for output and storing data in main memory for input. The alternative is known as direct memory ______

    <p>access</p> Signup and view all the answers

    External devices can be categorized into Human readable, Machine readable, and ___________ devices.

    <p>Communication</p> Signup and view all the answers

    The major functions for an I/O module include control and timing, processor communication, device communication, data buffering, and ___________.

    <p>Error detection</p> Signup and view all the answers

    The I/O module communicates both with the processor and with the ___________ unit.

    <p>external</p> Signup and view all the answers

    Keyboard input generates an electronic signal that is interpreted by the ___________ in the keyboard.

    <p>transducer</p> Signup and view all the answers

    On output, IRA code characters are transmitted to an external device from the I/O module, where the ___________ interprets this code.

    <p>transducer</p> Signup and view all the answers

    The text generated from keyboard input can be stored in the ___________ code.

    <p>IRA</p> Signup and view all the answers

    Study Notes

    External Devices

    • Human readable devices are suitable for communicating with the computer user
    • Machine readable devices are suitable for communicating with remote devices
    • Storage devices are suitable for storing data in IRA code

    I/O Module Functions

    • The major function of an I/O module related to device communication is to handle control and timing, processor communication, device communication, data buffering, and error detection and correction
    • The I/O module communicates both with the processor and with the external device unit

    Keyboard Input

    • When a user depresses a key on a keyboard, an electronic signal is generated
    • The signal is interpreted by the transducer in the keyboard
    • The text generated from keyboard input can be stored in the IRA code

    I/O Techniques

    • Programmed I/O technique allows the processor to execute a program to control the I/O operation
    • The main drawback of the Programmed I/O technique is that it occupies the processor's time and attention
    • Interrupt driven I/O technique allows the processor to continue with its normal tasks while the I/O operation is being performed
    • The Interrupt driven I/O technique allows the processor to multitask and not be occupied by the I/O operation
    • Direct Memory Access (DMA) I/O technique allows the I/O device to directly access the system memory without the processor's involvement

    I/O Device Controller

    • An I/O Device Controller handles the flow of data between the I/O device and the system memory

    I/O Commands

    • An I/O module may receive commands such as read, write, and control when addressed by a processor

    Memory Mapped I/O

    • Memory Mapped I/O has in common with memory that it shares an address space
    • I/O devices and memory share the same address space
    • No special commands for I/O are needed
    • Large selection of memory access commands are available

    Isolated I/O

    • Isolated I/O has separate address spaces for I/O devices and memory
    • Need I/O or memory commands for communication

    Processor Communication

    • Processor communication involves command decoding, data, status reporting, and error recognition

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    Description

    Test your knowledge of external devices and input/output functions with this quiz. Learn about the categories of external devices, block diagrams, and the functioning of a computer keyboard in the context of input/output processes.

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