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) |
+=============================================================================+