Re: Microsoft open sources DOS 1.0

From	malxau <invalid@invalid.net>
Newsgroups	aus.computers
Subject	Re: Microsoft open sources DOS 1.0
Date	2026-05-23 04:09 +0000
Organization	A noiseless patient Spider
Message-ID	<10ur99u$20ea9$1@dont-email.me> (permalink)
References	<n5sqgvFoc0jU1@mid.individual.net> <b5dmscvsqb8w.rmi8usiekuqr$.dlg@40tude.net>

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JJ <jj4public@gmail.com> wrote:
> All Microsoft's released MS-DOS source codes are not true open source. All
> of them are missing the source code for the boot sector bootstrap code.

I've been working with the 4.0 release.  src\boot\msboot.asm should
generate boot.inc which is the code included by format.  I think it's
all there.

(...it's also quite nuts.  It checks that the system files are the first
two in the root directory, but loads the first cluster on the disk
to boot from whether the files point to it or not.  sys.com works by
defragging to ensure the first few clusters are free, poking the global
DOS memory to tell the allocator to look at the first cluster, and
creating a file.)

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Microsoft open sources DOS 1.0 Axel <none@not.here> - 2026-05-05 10:04 +1000
  Re: Microsoft open sources DOS 1.0 JJ <jj4public@gmail.com> - 2026-05-05 13:37 +0700
    Re: Microsoft open sources DOS 1.0 Frank Slootweg <this@ddress.is.invalid> - 2026-05-05 12:57 +0000
      Re: Microsoft open sources DOS 1.0 Frank Slootweg <this@ddress.is.invalid> - 2026-05-05 13:50 +0000
      Re: Microsoft open sources DOS 1.0 JJ <jj4public@gmail.com> - 2026-05-06 15:02 +0700
        Re: Microsoft open sources DOS 1.0 Frank Slootweg <this@ddress.is.invalid> - 2026-05-06 14:09 +0000
          Re: Microsoft open sources DOS 1.0 JJ <jj4public@gmail.com> - 2026-05-07 03:29 +0700
            Re: Microsoft open sources DOS 1.0 Keithr0 <nothing.to.see@here.com.au> - 2026-05-07 10:49 +1000
            Re: Microsoft open sources DOS 1.0 Frank Slootweg <this@ddress.is.invalid> - 2026-05-07 12:24 +0000
    Re: Microsoft open sources DOS 1.0 malxau <invalid@invalid.net> - 2026-05-23 04:09 +0000

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