WAP to input a string from keyboard and convert it to lowercase and display in clear screen with red on white

TITLE WAP to input a string from keyboard and convert it to lowercase and display in clear screen with red on white

;DOSSEG 

.MODEL SMALL

.STACK 

.DATA

   ;Variables Defines

   paralst label byte

   maxlen db 50

   actlen db ?

   str1 db 50 dup ('$')

   lstr db 50 dup ('$')

   msg1 db 'Enter String You Wanted to Convert Lowercase : $'

   msg2 db 'Your lower Case String is : $'  

.code

    main proc

    ; data segment initilized

    mov ax,@data

    mov ds,ax

    ;clear screen

    mov ah,06h

    mov al,00h

    mov bh,74h

    mov cx,0000h

    mov dx,184fh

    int 10h

    ; cursor set

    mov ah,02h

    mov bh,00h

    mov dh,8

    mov dl,1 

    int 10h

    ; display msg to input

     mov ah,09h

     lea dx,msg1

     int 21h 

     ;input string from keyboard

     mov ah,0ah

     lea dx,paralst

     int 21h

     ; convert Lower case

     mov cx,50

     lea si, str1

     lea di, lstr

up: mov al,[si]

     cmp al, 'A'

     jb down

     cmp al, 'Z'

     ja down

     add al,20H

 down: mov [di],al

       inc si

       inc di

       loop up 

  ; newline 

     mov ah,02h

     mov dx,13

     int 21h

     mov dx,10

     int 21h     

    ;display msg2

    lea dx,msg2

    mov ah,09h

    int 21h

    ; display Lowercae string

    mov ah,09h

    lea dx,lstr

    int 21h

    ;terminate

    mov ax,4c00h

    int 21h

    main endp

    end main

OUTPUT