; this example shows the use of aaa instruction (ascii adjust after addition). 
; it is used to add huge bcd numbers. 

name "bcd_aaa"

org     100h

; first number '9': 
mov     ah, 09h

; second number '5': 
mov     al, 05h

; al = al + ah = 
;    = 09h + 05h = 0eh 
add     al, ah

; clear tens byte of bcd 
; result: 
xor     ah, ah

; adjust result to bcd form, 
; ah = 1, al = 4  ->  '14' 
aaa

; print the result: 

; store contents of 
; ax register: 
mov     dx, ax

; print first digit: 
mov     ah, 0eh
; convert to ascii: 
or      dh, 30h
mov     al, dh
int     10h

; print second digit: 
; convert to ascii: 
or      dl, 30h
mov     al, dl
int     10h

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

ret  ; return control to operating system.