Assembly string input and Reverse print

.MODEL SMALL
.STACK 100H


.CODE
MAIN PROC
    INCLUDE 'EMU8086.INC'

    MOV CX, 0

    PUSHIN:
        MOV AH, 1
        INT 21H
        MOV BL, AL

        CMP BL, 0DH ;ENTER BUTTON
        JE NEWLINE
        PUSH BX
        INC CX
        JMP PUSHIN



    NEWLINE:

        PRINTN ''

    POPOUT:
        POP DX
        MOV AH, 2
        INT 21H
        LOOP POPOUT

    MOV AH, 4CH
    INT 21H


END MAIN