BITS 16

mov al, 0x21
mov ah, 0x0E
int 0x10

mov ah, 0x02
mov cl, 2
mov al, 1
mov ch, 0
mov dh, 0

mov bx, 0x07E0
mov es, bx
mov bx, 0
int 0x13
jmp 0x07E0:0000

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

mov al, 0x39
mov ah, 0x0E
int 0x10