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(nasm.info)Section 6.1

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6.1. `bin': Flat-Form Binary Output
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   The `bin' format does not produce object files: it generates nothing
in the output file except the code you wrote. Such `pure binary' files
are used by MS-DOS: `.COM' executables and `.SYS' device drivers are
pure binary files. Pure binary output is also useful for operating
system and boot loader development.

   The `bin' format supports multiple section names. For details of how
nasm handles sections in the `bin' format, see *Note Section 6.1.3::.

   Using the `bin' format puts NASM by default into 16-bit mode (see
*Note Section 5.1::). In order to use `bin' to write 32-bit code such as
an OS kernel, you need to explicitly issue the `BITS 32' directive.

   `bin' has no default output file name extension: instead, it leaves
your file name as it is once the original extension has been removed.
Thus, the default is for NASM to assemble `binprog.asm' into a binary
file called `binprog'.

Section 6.1.1

`ORG': Binary File Program Origin

Section 6.1.2

`bin' Extensions to the `SECTION' Directive

Section 6.1.3

`Multisection' support for the BIN format.

Section 6.1.4

Map files