dosseg
.model small
.stack 100h
.data
.code

main proc

mov ah, 2

mov bx, 1
mov cx, 5

lines:

    push cx

    push cx

    spaces:
        mov dx, ' '
        int 21h
    loop spaces

    pop cx

    mov cx, bx

    stars:
        mov dx, '*'
        int 21h
    loop stars

    pop cx
    inc bx

    mov dx, 10
    int 21h
    mov dx, 13
    int 21h

loop lines

mov ah, 4ch
int 21h
main endp
end main