Pioneer SCSI-2 - Manual (Page 86)

Play Audio Track Index
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2.14 Play Audio Track Index (48h)
Operation Code is (48h).
Starting Track/Index
The starting track field specifies the track number of the starting audio track. The starting
index field specifies the index number within the track at which the audio play operation
shall begin.
Ending Track/Index
The ending track field specifies the track number of the ending audio track. The ending
index field specifies the index number within the track after which the audio play operation
shall stop. The audio play operation shall terminate at the last block with an index number
equal to the ending index. All contiguous audio sectors between the starting and ending
address shall be played.
The PLAY AUDIO TRACK INDEX command requests the drive begin an audio play operation.
The command function (Immed) and the output of audio signals shall be specified by the settings
of the mode parameters page code 0Eh.
If the starting address is less than the ending address, the command will be terminated with
Check Condition sense key set to ILLEGAL REQUEST.
If the starting address is not found, or if the address is not within an audio track, or if a not ready
condition exists, the command shall be terminated with Check Condition status. Valid values for
the track and index fields are 1 to 99.
If the ending track is greater than the last information track on the media, the playback will
continue until the last track is complete. If the ending index is greater than the largest index value
on the ending track, the playback shall continue until this track is complete then terminate.
These conditions are not considered errors.
If the starting index is greater than the largest index value on the starting track, and the stop on
track crossing (SOTC) bit of the audio control MODE SELECT parameters page code 0Eh is
zero, the playback operation will start at the beginning of the next track.
If the starting index is greater than the largest index value on the starting track, and the stop on
track crossing (SOTC) bit of the audio control MODE SELECT parameters page is one, the
playback shall not begin. The target shall return Check Condition, and the sense key set to
ILLEGAL REQUEST.