print the string in reverse manner using assembly X86

; print the string in reverse manner
;----------------------------------------------------------------------------
.model small

.data
message_display macro msg
mov dx,offset msg
mov ah,09h
int 21h
endm

msg1 db 10,13, "Enter the string $"
msg2 db 10,13, "Reversed string is $"
msg3 db 10,13, "$"
string db 10h dup(0)
len db 00h

.code
mov ax,@data
mov ds,ax

message_display msg1

lea si,string

next_char: mov ah,01h
int 21h
mov [si],al
inc si
inc len
cmp al,0dh
jnz next_char

mov al,24h
mov [si],al
inc len

message_display msg2
message_display msg3
mov bh,len

loop1: mov dl,[si]
mov ah,02h
int 21h
dec si
dec bh
jnz loop1

mov ah,4ch
int 21h
end

;------------------------------------------------------------------------------------
; done by prof. Dhumane A.V. VIIT, Pune