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Annoying (N)ASM problem...

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I was making the change from MASM to NASM. I wrote this program in NASM to experiment with. When I compile it, it works up until the result, then it displays some garbage. The program worked until I added "+" and "=" support, then it became a problem. Any help is greatly appreciated. Thanks very much.
org 100h

;clear ax
xor ax, ax

;read a digit
mov ah, 1
int 21h

;convert to a number
sub al, 30h

;display "+"
mov dl, 2Bh
mov ah, 2
int 21h

;save it in dl
mov dl, al

;read second digit
mov ah, 1
int 21h

;convert to a number
sub al, 30h

;add the two
add al, dl

;convert to a digit
xor ah, ah
add al, 30h
push ax

;display "="
mov dl, 3Dh
mov ah, 2
int 21h

;swap ax and dx
pop ax
mov [holdon], ax
mov dx, holdon

;display the number
mov ah, 9
int 21h

mov dx, msg
mov ah,9
int 21h

;return to dos
mov ah, 4ch
int 21h

msg db ''Calculation Complete!'', 0Dh, 0Ah,''$''
holdon dw ''00$''
===== Khaos =====

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