; the easiest way to print "hello, world!" 

name "hi"

org 100h

jmp start       ; jump over string declaration 

msg     db      "hello, world!", 0Dh,0Ah, 24h

start:  lea     dx, msg  ; load effective address of msg into dx. 
        mov     ah, 09h  ; print function is 9. 
        int     21h      ; do it! 

        mov     ah, 0
        int     16h      ; wait for any key any.... 

ret ; return to operating system.