From:	Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: OS Loader
Organization:	Pin Eight Software http://pineight.8m.com/
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NNTP-Posting-Date:	Sat, 16 Dec 2000 15:54:44 GMT
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Date:	Sat, 16 Dec 2000 15:54:44 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

On 14 Dec 2000 16:21:43 GMT, Hans-Bernhard Broeker
<broeker AT physik DOT rwth-aachen DOT de> wrote:

>MarcoCorelli AT gtwparc DOT padova DOT ccr DOT it wrote:
>> My problem is that the 1st file is my OSLoader and not IO.SYS !!! I can't 
>> change this because the MBR Booter load the 1st file and lunch it.
>> I need know where and how IO.SYS is loaded for launch MS-DOS!!!
>
>But (even if you write 15 exclamation points after each sentence...)
>that still doesn't explain why you insist on loading IO.SYS directly,
>rather than a copy of an MSDOS boot block, which is how MSDOS is
>supposed to be booted.

I think OP is trying to say that either
 o the DOS bootloader is not loading io.sys because it isn't in the
   first directory entry, or
 o OP really wants to load eir own bootloader instead of io.sys, and
   then chain to io.sys.

>In principle, you should be able to disassemble the boot code and
>understand how it loads and starts IO.SYS, but I wouldn't bet on that
>to be easy, or even legal these days. Not with the "Digital Millenium
>Copyright Act" stating that reverse engineering is forbidden.

Only when an "effective access control" (ask your attorney) is
present.  Currently, this means encrypting the content with at least
2-bit XOR.

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