CSEG segment ASSUME CS CSEG ES CSEG DS CSEG SS CSEG org 100h _start mo

CSEG segment
ASSUME CS:CSEG, ES:CSEG, DS:CSEG, SS:CSEG
org 100h

_start:

        mov dx, offset msg_key
        call PRINTER
        mov ah, 10h
        int 16h
        cmp al, 'Y'
        jz _EXIT

        mov dx, offset msg_noexit
        call PRINTER
        int 20h

        PRINTER proc
                mov ah, 9
                int 21h
        PRINTER endp

        _EXIT:
                mov dx, offset msg_exit
                call PRINTER
                int 20h

        msg_key DB 'Press key "y" for exit$'
        msg_exit DB 0Dh, 0Ah, 'Exit!$'
        msg_noexit DB 0Dh, 0Ah, 'No exit...$'

CSEG ends
end _start