一段代码与自己想要的结果不符，求教

[chanshimudingxi]

CODES SEGMENT
    ASSUME CS:CODES
START:
    ;此处输入代码段代码
    call hexibin
    call crlf
    call binidec
    call crlf
    
    
hexibin	proc near
	mov		bx,0
newchar:
	mov		ah,01h
	int 	21h
	sub		al,30h
	jl		exit
	cmp		al,10d
	jl		add_to
	sub		al,27h
	cmp		al,0ah
	jl		exit
	cmp		al,10h
	jge		exit
add_to:
	mov		cl,4
	shl		bx,cl
	mov		ah,0;ax由ah,al组成，而al中存的是输入字符所代表的十六进制的值，所以ah得初始化为0，这样ax的结果才正确
	add		bx,ax
	jmp		newchar
exit:	
	ret
hexibin	endp



binidec	proc near
	mov		cx,10000d;BX寄存器是16位，最大值也只有65535
	call	dec_div
	mov		cx,1000d
	call	dec_div
	mov		cx,100d
	call	dec_div
	mov		cx,10d
	call	dec_div
	mov		cx,1d
	call	dec_div
	ret
binidec	endp

dec_div	proc near
	mov		ax,bx
	mov		dx,0
	div		cx
	mov		bx,dx
	mov		dl,al;商在AX寄存器中，而要显示的字符的ASCII码须放在dl寄存器中，因为商是在0~9之间，故只需把AX的低位AL给DL就可以
	add		dl,30h
	mov		ah,02h
	int		21h
	ret
dec_div	endp

crlf proc near
	mov		al,0ah
	mov		ah,02h
	int		21h
	mov		dl,0dh
	mov		ah,02h
	int 	21h
	ret
crlf endp

CODES ENDS
    END START

在masm下我输入30，为什么输出为000488呢？而不是00048

[zara]

crlf proc near
    mov        al,0ah  ;* 因为这里应该是 mov  dl, 0ah
    mov        ah,02h
    int        21h
    mov        dl,0dh
    mov        ah,02h
    int     21h
    ret
crlf endp