opening and reading a character from a file with emu8086 assembler

Hi! I am new to assembly. I am currrently writing a program that opens
a file, reads on character at a time and print each character on the
screen. It prints the '$' character in a seemingly infinite loop. Here
is my code:

org 100h ;.com memory layout

mov dx, offset file ;address of file to dx
mov al,0 ;openfile (read-only)
mov ah,3dh
int 21h ;call the interupt
jc terminate ;if error occurs, terminate program
mov bx,ax ;put handler to file in bx

mov cx,1 ;read one character at a time
print:
mov ah,3fh ;read from the opened file (its handler in bx)
int 21h
jc terminate ;end program if end of file is reached
mov ax,dx ;char is in dl, send to ax for printing (char is in
al)
mov ah,0eh ;print character
int 10h
jmp print ;repeat if not end of file

terminate:
ret

file db "c:\input.txt",0
handle dw ?

so where is the bug?

.

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