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(nasm.info)Section 6.1.1

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6.1.1. `ORG': Binary File Program Origin
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   The `bin' format provides an additional directive to the list given
in Note: Chapter 5: `ORG'. The function of the `ORG' directive is to
specify the origin address which NASM will assume the program begins at
when it is loaded into memory.

   For example, the following code will generate the longword
`0x00000104':

             org     0x100
             dd      label
     label:

   Unlike the `ORG' directive provided by MASM-compatible assemblers,
which allows you to jump around in the object file and overwrite code
you have already generated, NASM's `ORG' does exactly what the directive
says: _origin_. Its sole function is to specify one offset which is
added to all internal address references within the section; it does not
permit any of the trickery that MASM's version does. See *Note Section
10.1.3:: for further comments.