Practise

org 100h
.stack 100h
.data

str db "*$"
i db 0
j db 0

N db 5
M db 5
NL DB 0AH,0DH, "$"



.code
main proc


mov dx, @data
mov ds, dx

mov i,0        ; initialize with 0
mov j,0


condstar1:


mov cl,N
cmp i, cl
jl itestar2
jmp exitstar



                    condstar2:

                        mov bl,M
                        cmp j,bl


                        jl itestar2


                        jmp iterstar1




                        itestar2:

                        lea dx, str
                        mov ah,9
                        int 21h

                        inc j
                        jmp condstar2



iterstar1:

    lea dx, nl
    mov ah,9
    int 21h


    inc i
    jmp condstar1



;newline:







exitstar:


endp main
end main

ret