Table 160
+==============-==============================================================+
| Bit 7 6 5 4 | Description of pin 34 use |
|--------------+--------------------------------------------------------------|
| P 0 0 0 | Open |
| P 0 0 1 | Ready |
| P 0 1 0 | Disk changed |
|-----------------------------------------------------------------------------|
| NOTES |
| 1 P is a polarity bit, where 0 is active low and 1 is active high. |
| 2 All undefined values are reserved. |
+=============================================================================+