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Thread: Loading a program in a boot sector

  1. Feb 27th, 2002, 02:28 PM #1
    Steven Graham
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    Loading a program in a boot sector

    Hi
    I have a boot sector program that I want to load another program from the disk.

    Since free space on the 512KB Boot sector is limited, I want to go straight to the start of the data part of the disk (ignoring the FAT).

    I want to load this file from disk into memory and then execute it.

    Please note, this is in Real Mode.

    1. How do I set aside some RAM and load it in (I know it's using Int13).

    2. I'm not sure how to execute it, I know I take the CPU to it with a JMP Instruction, but I need some helpful advice.
    Steven Graham
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  2. Feb 27th, 2002, 03:53 PM #2
    VBTZH
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    Re: Loading a program in a boot sector

    I don't have a clue
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  3. Feb 27th, 2002, 04:47 PM #3
    ChimpFace9000
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    Re: Re: Loading a program in a boot sector

    Originally posted by VBTZH
    I don't have a clue :(
    Then why did you post?
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  4. Mar 6th, 2002, 03:37 PM #4
    CornedBee
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    I collected some links:
    http://nondot.org/sabre/os/files/Booting/nasmBoot.html
    http://www.geocities.com/mvea/bootstrap.htm
    http://www.omen.net.au/~philipm/dazi...rial/menu.html

    In this order from least to most advantaged.
    The first seems what you're searching for, the second scans the FAT of the floppy disk and the third seems to be pretty advanced, with much background information. It is incomplete (but bootstraps are explained).
    All the buzzt
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  6. Mar 6th, 2002, 04:20 PM #5
    CornedBee
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    BTW I think this is the bootstrap of linux 2.x
    http://www.ibiblio.org/navigator-bin...oot/bootsect.S
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    CornedBee

    "Writing specifications is like writing a novel. Writing code is like writing poetry."
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