[BITS 16]

start:
    mov ax, 07C0h
    add ax, 288
    mov ss, ax
    mov sp, 4096
    mov ax, 07C0h
    mov ds, ax
    mov si, text_string
    call print_string
    jmp $

text_string db 'Hello World!', 0

print_string:
    mov ah, 0Eh

.repeat:
    lodsb
    cmp al, 0
    je .done
    int 10h
    jmp .repeat

.done:
    ret

times 510-($-$$) db 0
dw 0xAA55