CS609 Quiz No.2 Solution and Discussion


  • Cyberian's

    Please post your current Quiz and Help the Students.
    Quiz No.2 Total Questions : 10
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  • Cyberian's Gold

    @zareen said in CS609 Quiz No.2 Solution and Discussion:

    What are the 3 types of viruses?

    • Resident Virus. Resident viruses live in your RAM memory. …

    • Multipartite Virus. …

    • Direct Action Virus. …

    • Browser Hijacker. …

    • Overwrite Virus. …

    • Web Scripting Virus. …

    • Boot Sector Virus. …

    • Macro Virus.



  • What are the 3 types of viruses?


  • Cyberian's

    @zaasmi
    (1)_________ is used to identify the cause of interrupt.

    Interrupt ID Register (Page 116)

    PC Register

    Register

    None of All These

    (2)Int ________ is used to control the printer via the BIOS.

    17H (Page 84)

    18H

    20H

    21H

    (3)Only ________ ports are important from programming point of view.

    70 and 71H (Page 141)

    71 and 72H

    70 and 72H

    72 and 73H

    (4)In case of synchronous communication a timing signal is required to identify the start and end of a bit.

    True ( 105)

    False

    (5)

    In order to produce the sound from PC internal Speaker we have to load the___bit divisor value at the ___port.

    8, 0x21

    16, 0x42

    32, 0x22

    64, 0x32

    (6)The ____________ function simply enables the self test facility within the modem control register STOn()

    SelfTest()

    SelfTestOn() (Page 127)

    Non of these

    (7)BIOS support _____________UARTS as COM ports.

    6

    4 (Page 113)

    3

    2

    (8)The BIOS interrupt 0x1AH can be used to configure real time clock

    True (Page 136)

    False

    (9)The baud rate is set in accordance with the divisor value loaded within the UART internal registers base +0 and base +1.

    TRUE (Page 114)

    FALSE

    (10) The -------------function uses the COM port number to receive a byte from the COM port using BIOS services.

    Receive( )

    Recievebyte()

    recievechar() (125)

    None of All These


  • Cyberian's

    1_Blocks can be termed as______________.
    Cylinder per sector (not sure)

    2_ _______ are the circular division of the disk.
    Tracks

    3_ We can access Blocks for FAT using _________.
    FCB

    4_ ________ is an internal data structure of DOS and resides in main memory.
    None of the given.
    (Ans is SFT, however its not in options.)

    5_ To access drive parameter block we use undocumented service ______.
    21H/32H

    6_ _______ is an absolute address relative to the start of physical drive.
    LBA 240pg

    7_There is/are ____ DMA controller’s masking register(s).
    1 not sure

    8_ Highest physical capacity of the disk according to the IDE interface is approximately _________.
    127GB

    9_ To access the block within cluster using BIOS services the cluster number should be converted into _____.
    LSN pg258

    10_ What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
    3 pg249


  • Cyberian's

    @zaasmi
    There is/are ____ DMA controller’s masking register(s). CS609


  • Cyberian's

    1. Extended BIOS services require that the address of the block is specified as _______. CS609

    2. Highest capacity of disk can be accessed using BIOS functions is _______.
      • Hence the highest capacity of disk can be
      accessed using bios functions is
      •63x16x1024x512= 504 MB approx

    3. _______ are the circular division of the disk. (Track)

    4. _________ can be used to simulate a DMA request through software (Choose best option).

    All quiz are repeating as per previous post.


  • Cyberian's

    There is/are ____ DMA controller’s masking register(s). CS609
    Not confirmed
    2bff1733-3f97-496b-823b-b8fa55118ab9-image.png


  • Cyberian's

    ______________ used to program various common parameters of transfer for all the channels. CS609

    (DMA command register) Page 191

    29713bdd-9ca4-48a9-a0c1-6193e182d1f1-image.png

    This is the command register. It is used to program various common parameters of
    transfer for all the channels.


  • Cyberian's

    Blocks can be termed as______________. CS609
    sectors per track (Page 202)
    92766509-30ad-492d-87b3-23bc0bbca045-image.png

    Blocks
    • Blocks are the sectors per track
    •Smallest addressable unit in memory
    •Address of block is specified as a unique
    combination of three parameters (i.e. track, head,
    sec)


  • Cyberian's

    Extended BIOS services require that the address of the block is specified as _______. CS609
    LBA address (Page 210)

    Extended services require that the address of the block is specified as a LBA address.

    328be538-02e7-40a5-8f92-ddf88aaab578-image.png


  • Cyberian's

    Highest physical capacity of the disk according to the IDE interface is approximately _________. CS609
    (127GB) Page 212

    Highest IDE capacity
    • Hence highest physical capacity of the disk
    according to the IDE interface is
    255x16x65536x512 = 127GB
    •Extended BIOS functions allow to access disk
    with sizes greater than 504 MB through LBA
    translation.

    56f19559-90a8-4ab0-bda4-397e09debfb1-image.png


  • Cyberian's

    ________ are the longitudinal division of the disk. CS609
    (Sector) Page 201
    9d4e7cdc-ccb7-4e0a-869f-21b511717404-image.png
    Tracks are the circular division of the disk and the sectors are the longitudinal division of
    the disk as shown in the diagram above.

    60941831-db48-43cb-be69-a1ff36e62f5f-image.png


  • Cyberian's

    _________ can be used to simulate a DMA request through software (Choose best option). CS609
    (DMA request register) Page 192
    7d3e1519-9af8-49f5-b3bc-8f52cd4f53a0-image.png


  • Cyberian's

    A DMA cannot work in ___________ mode.

    8c2bcf74-333b-42a1-ad9b-1c4dc314bc0c-image.png


  • Cyberian's

    __________ will specify if the DMA transfer will happen as a single transfer, block transfer or demand transfer. ( command register Page 73)
    9bb06582-008d-473d-94fb-37cb36020cd4-image.png



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