Table 257

+=====-========-========-========-========-========-========-========-========+ 
|  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    | 
|Byte |        |        |        |        |        |        |        |        | 
|=====+=======================================================================| 
|     |                        Sub-channel data header                        | 
|=====+=======================================================================| 
| 0   |                               Reserved                                | 
|-----+-----------------------------------------------------------------------| 
| 1   |                             Audio status                              | 
|-----+-----------------------------------------------------------------------| 
| 2   | (MSB)                                                                 | 
|-----+---                     Sub-channel data length                     ---| 
| 3   |                                                                 (LSB) | 
|=====+=======================================================================| 
|     |                  CD-ROM current position data block                   | 
|=====+=======================================================================| 
| 4   |                  Sub channel data format code (01h)                   | 
|-----+-----------------------------------------------------------------------| 
| 5   |                ADR                |             Control               | 
|-----+-----------------------------------------------------------------------| 
| 6   |                             Track number                              | 
|-----+-----------------------------------------------------------------------| 
| 7   |                             Index number                              | 
|-----+-----------------------------------------------------------------------| 
| 8   | (MSB)                                                                 | 
|- - -+---                     Absolute CD-ROM address                     ---| 
| 11  |                                                                 (LSB) | 
|-----+-----------------------------------------------------------------------| 
| 12  | (MSB)                                                                 | 
|- - -+---                  Track relative CD-ROM address                  ---| 
| 15  |                                                                 (LSB) | 
+=============================================================================+