Pioneer SCSI-2 - Manual (Page 156)

Start/Stop Unit
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2.39 Start/Stop Unit (1Bh)
Operation code is (1Bh).
Immed (Immediate)
When the immediate bit is 1, status is returned before executing the command . When it is
0, status is returned after the operation is completed.
LoEj (Load Eject)
When LoEj is 1 and Start is 0, the drive ejects the magazine.
Start
When Start is 1, the disc tray is loaded, the disc is spun up, and the laser and servo system
are turned on. When it is 0, the disk is spun down.