BCD to ASCII conversion

Question

I know that every 4 bit in BCD is one digit in decimal, but I have a problem, for example when I want to print a BCD value stored in CH I do this :

add ch, 30h
         


        

Answer 1

mov al,ch      ; if ch has 12h
aam            ; ax will now be 0102h
or ax,3030h    ; converting into ascii - ax will now become 3132h
; you can now print the value in ax
mov cx,ax
mov dl,ch      ; to print on screen
mov ah,02h
int 21h
mov dl,cl
int 21h
ret

8086 AAM Instruction

8086 INT 21h function to print a character