hexprint16:
	xchg ah, al
	call hexprint8
	xchg ah, al

hexprint8:
	push ax
	push cx
	mov cl, 4
	shr al, cl
	call hexprint4
	pop cx
	pop ax

hexprint4:
	push ax
	and al, 0xf
	cmp al, 10
	jb .digit09

	add al, 'a' - '0' - 10

	.digit09:
	add al, '0'
	mov ah, 0x0e
	int 0x10
	pop ax
	ret

space:
	push ax
	mov ax, 0x0e00 + ' '
	int 0x10
	pop ax
	ret

hang:
	hlt
	jmp hang

wait_key:
	push ax
	xor ah, ah
	int 0x16
	pop ax
	ret