[OT] extracting boot image from 'el torito' image

[Brent Verner <brent@rcfile.org>]

Hi,
  Sorry for the noise, but I figured this is the best list for the
question.

  How can I extract the boot image from a bootable ISO image?

I've tried
    dd if=iso.raw of=boot.img bs=2 skip=21 count=720
but it doesn't give me the bootable floppy image.

Many thanks.
  brent

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