8086 Assembly program : Character case conversion of String

.model small

.stack 100h

.data

input db "DeepRaj$"

.code

main proc    

    mov ax,@data

    mov ds,ax

    mov si,offset input

    L1:mov al,[si]

    ;mov bl,al

    cmp al,'$'

    je L3         

    xor al,32

    mov [si],al

    inc si

    jmp L1

    L3:mov [si],al

    mov dx,offset input

    mov ah,9

    int 21h

    mov ah,4ch

    int 21h

main endp

end main