section .data
 txt:  db 'This is my 1st asm prog!',10
 len:  equ $-txt

section .text
 global _start

_start:
 mov eax,4
 mov ebx,1
 mov ecx,txt
 mov edx,len
 int 80h
 mov eax,1 
 mov ebx,0
 int 80h