Pioneer SCSI-2 - Manual (Page 31)

CD-ROM SCSI-2 COMMAND REFERENCE MANUAL VERSION 3.1 (OB-U0077C)
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T ABLE 2-3 CHANGE DEFINITION
Bit
Byte 7 6 5 4 3 2 1 0
0 Operation Code (40h)
1 Logical Unit Number Reserved
2 Reserved SCB=0
3 Reserved Definition Parameter
4 Reserved
5 Reserved
6 Reserved
7 Reserved
8 Parameter Data Length (0)
9 Reserved