binary output

.model small
.stack 100h
.data
.code

main proc
    mov bl,2

    mov cx,8

    l1:
    rcl bl,1
    jnc print
    mov ah,2
    mov dl,'1'
    int 21h
    jmp l2

    print:
    mov ah,2
    mov dl,'0'
    int 21h

    l2:
    loop l1

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