Table 161
+==============-==============================================================+
| Bit 7 6 5 4 | Description of pin 4 use |
|--------------+--------------------------------------------------------------|
| P 0 0 0 | Open |
| P 0 0 1 | In use |
| P 0 1 0 | Eject |
| P 0 1 1 | Head load |
|-----------------------------------------------------------------------------|
| NOTES |
| 1 P is a polarity bit, where 0 is active low and 1 is active high. |
| 2 All undefined values are reserved. |
+=============================================================================+