org 7C00h
use16

cli
mov ax, 0
mov es, ax
mov ds, ax
mov ss, ax
mov sp, 7C00h
sti

mov ax, 0003h
int 10h

mov ax, 1301h
mov bp, stroka
mov dx, 0000h
mov cx, 21
mov bx, 000eh
int 10h



  mov ah, 42h
  mov si, lba
  mov dl, 80h
  int 13h
  jc error

 jmp 0000:7E00h


error:
        mov ax, 1301h
        mov bp, err0
        mov dx, 0100h
        mov cx, 6
        mov bx, 000eh
        int 10h
        jmp $

err0   db 'Error!'
stroka db 'Ok, MBR loaded again!'

lba:

db 10h
db 00h
dw 0001h
dd 00007e00h
dq 0000000000000001h
dq 0000000000000000h

times 510 - ($ - $$) db 0
db 0x55,0xAA