Change Case

INCLUDE 'EMU8086.INC'

.model small

.stack 100h

.data

.code

main proc

    mov ah,01
    int 21h
    mov bl,al

    mov ah,2
    mov dl,13
    int  21h

    mov ah,2
    mov dl,10
    int  21h


    cmp bx,97
    jge small_to_big

        add bl,32
        mov ah,2
        mov dl,bl
        int 21h
        jmp exit

    small_to_big:
        sub bl,32
        mov ah,02
        mov dl,bl
        int 21h
        jmp exit

     exit:
        mov ah,4ch
        int 21h

     main endp
    end main
   ret