loop and dec of print colum and row

.MODEL SMALL
.STACK 100H
.DATA
.CODE




MAIN PROC

     MOV CX,6
     MOV BX,6

    TOP:
    MOV AH,2
    MOV DL,'*'
    INT 21H
    DEC BX
    CMP BX,0
    JE EXIT
    JMP TOP

    EXIT:
    MOV AH,2
    MOV DL,10
    INT 21H
    MOV DL,13
    INT 21H

    MOV BX,6
    LOOP TOP

    MOV AH,4CH
    INT 21H

    MAIN ENDP
END MAIN