def test_initial_state(self):
        self.assertEqual(self.mda.control_reg, 0x00)
        self.assertEqual(self.mda.control_reg, 0x00)
        self.assertEqual(self.mda.screen, None)
        self.assertEqual(self.mda.char_generator, self.cg)
        self.assertEqual(len(self.mda.video_ram), 4096)