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Thread: Cold Boot

  1. #1
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    Question Cold Boot

    Identify what happens during a cold boot for a PC using Windows Operating System

  2. #2
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    1st the video BIOS runs, telling the computer what video card is installed.

    Power On Self Test runs next, which reads the BIOS or CMOS information. Basic Input Output System is stored in a ROM chip called Complimentary Metal Oxide Semiconductor and holds information about the machine, CPU, hard drives, periferals, IRQ addresses for COM ports, and other information needed at start up. Memory is counted up at this time.

    Then the config.sys and autoexec.bat files are run, the Operating System takes over and runs himem.sys, system.ini, win.ini, reads the registry, installs necessary drivers and loads the GUI or Graphical User Interface, which we know as Windows, and loads any programs in the Start Up folder.

    That's a basic description, anything more in-depth would get really technical, and I'm barely awake...couldn't get much deeper than that anyway.

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  3. #3
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    Post

    Originally posted by Paleo Pete:
    1st the video BIOS runs, telling the computer what video card is installed.

    Power On Self Test runs next, which reads the BIOS or CMOS information. Basic Input Output System is stored in a ROM chip called Complimentary Metal Oxide Semiconductor and holds information about the machine, CPU, hard drives, periferals, IRQ addresses for COM ports, and other information needed at start up. Memory is counted up at this time.

    Then the config.sys and autoexec.bat files are run, the Operating System takes over and runs himem.sys, system.ini, win.ini, reads the registry, installs necessary drivers and loads the GUI or Graphical User Interface, which we know as Windows, and loads any programs in the Start Up folder.

    That's a basic description, anything more in-depth would get really technical, and I'm barely awake...couldn't get much deeper than that anyway.

  4. #4
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    I just wanted to say thanks to Paleo Pete for the info. I got that for assignment and I saw persons handing in pages of info, so I don't know how they got so much.

    But you're right, that's technical enough as it is. I'll see I can compare with fellow students. Thanks again.

  5. #5
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    Post

    Somewhere on the site I have a listing of the boot process. Search for "boot and cold and process" without the quotes and it's probably in the results somewhere.

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    Charles M. Kozierok
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    Charles M. Kozierok
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    Note: Please reply to my forum postings here on the forums. Thanks.

  6. #6
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    OK, here it is, from the horse's mouth, as it were...

    Boot Process as described in the PC Guide.

    Didn't think to look up any kind of resources when I posted my first reply, just wanted to see if I could come up with a good description off the top of my head without looking up any info...

    ------------------
    If you had everything...Where would you put it?

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    Note: Please post your questions on the forums, not in my email. Otherwise I may sic my armed bear on you!

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  7. #7

    Post

    POST (Power On Self Test)

    When the power is first tunred on, the system clock begins to generate clock pulses.

    The CPU (Central Processing Unit) begins working and initializes itself (resetting its internal values).

    The CPU turns to memory address FFFF0, which is the memory address always assigned to the first instruction in the ROM BIOS startup program.

    This instruction directs the CPU to run the POST tests.

    POST first checks the BIOS program operating it and then tests CMOS RAM.

    A test is done to determine that there has not been a battery failure.

    Hardware inturrupts (IRQs) are disabled (this means that pressing a key on the keyboard or using another imput device at this point will not affect anything).

    Tests are run on the CPU and it is further initialized.

    A check is done to determine if this is a cold boot. If so, then the first 16 KB of RAM is tested.

    Hardware devices installed on the computer are inventoried and compared to configuration information.

    Video, memory, keyboard, floppy disk drives, hard drives, ports, and other hardware devices are tested and configured, and IRQ, I/O addresses, and DMA assignments made. The OS will later complete this process.

    Some devices are set up to go into "sleep mode" to conserve electricity.

    The DMA controller is checked.

    Interrupt vectors are moved into the interrupt vector table.

    The interrupt controller is checked.

    CMOS setup is run if requested.

    BIOS then begins its search for an OS!


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