Table 255

+===========-===========================================================+
|  ADR code |  Description                                              |
|-----------+-----------------------------------------------------------|
|     0h    |  Sub-channel Q mode information not supplied              |
|     1h    |  Sub-channel Q encodes current position data              |
|           |  (i.e. track, index, absolute address, relative address)  |
|     2h    |  Sub-channel Q encodes media catalogue number             |
|     3h    |  Sub-channel Q encodes ISRC                               |
|  4h - Fh  |  Reserved                                                 |
+=======================================================================+