global _start
 
section .data
        buffer  dw      0h
 
section .text
 
_start:
        mov             ax, buffer
        mov             bx, 0234h
        

read:
        mov            ax, 03h                ; read()
        mov             bx, 00h                ; stdin
        int             80h
        ret
write:
        mov             ax, 04h                ; write()
        mov             bx, 01h                ; stdout
        int             80h
        ret