pub trait Backplane {
    fn data_bus(&self) -> u8;
    fn address_bus(&self) -> u16;
    fn read_mode(&self) -> bool;
    fn set_read_mode(&mut self, new_mode: bool);
    fn set_data_bus(&mut self, new_value: u8);
    fn set_address_bus(&mut self, new_value: u16);
    fn tick(&mut self);
}