[BITS 16] ;viktigt
[ORG 0x7C00] ;BIOS jmps here

mov si, string ;Move string pointer into Source Index
call print_string
mov ax, 0x2401
int 0x15

print_character:
    mov ah, 0x0E
    mov bh, 0x00
    mov bl, 0x07
    int 0x10
ret

print_string:
    next_character:
        mov al, [si] ;get one byte from the value pointed by si
        inc si ;Move si pointer to next character
        or al, al ;If al = zero, end of string

        jz exit_function
        call print_character
        jmp next_character

    exit_function:
        ret


string db 'Hello World', 0 ;Just a null terminated string
TIMES 510 - ($ - $$) db 0
DW 0XAA55 ; we need a boot signature of course.