6.4 Binary Output Format
If the binary output format has been selected, the contents of the file are just the raw data bytes emitted by the assembler, no header, relocations or symbol tables are generated. All references have to be resolved internally.The binary format is most useful for bootloaders or DOS COM files, but may be used to create any binary format. See sample Win32_5, that demonstrates how the binary format is used to create a Win32 application.
If a listing file is produced, a binary map will be added, which shows the file and memory layout of the image:
.model tiny
.data
00000000 0D0A48656C6C6F2C20 str1 db 13,10,"Hello, world!",13,10,'$'
00000000 .code
org 100h
00000100 start:
00000100 B409 mov ah, 09h
00000102 BA0000 mov dx, offset str1
00000105 CD21 int 21h
00000107 B8004C mov ax, 4c00h
0000010A CD21 int 21h
end start
Binary Map:
Segment Pos(file) VA Size(fil) Size(mem)
---------------------------------------------------------------
_TEXT 0 100 C C
_DATA C 10C 12 12
---------------------------------------------------------------
1E 1E
Note that bytes with "undefined contents" at the start and the end of the output file are skipped and won't become part of the binary.