section .data
        s:    db 'HELLO WORLD', 10 ; 10 = '\n'

section .text
        global _start ; adding _start name to object code

_start:
        mov eax, 4 ; system call 'write'
        mov ebx, 1 ; write to stdout
        mov ecx, s ; string adr
        mov edx, 12 ; string len
        int 80h

        mov eax, 1 ; system call 'exit'
        mov ebx, 0 ; exit code
        int 80h