.MODEL
.STACK 100H
.DATA
    MSG1 DB 10, 13, 'POSITIVE', '$'
    MSG2 DB 10, 13, 'NEGATIVE', '$'

.CODE
    MAIN PROC

        MOV AX, @DATA
        MOV DS, AX

        MOV AH, 1
        INT 21H
        MOV BL, AL

        CMP BL, 0
        JL NEGATIVE
        JGE POSITIVE

        NEGATIVE:
        MOV AH, 9
        LEA DX, MSG2
        INT 21H

        POSITIVE:
        MOV AH, 9
        LEA DX, MSG1
        INT 21H





        MOV AH, 4CH
        INT 21H

    ENDP MAIN
    END MAIN