Pioneer SCSI-2 - Manual (Page 152)

Set CD-ROM Speed(1)
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2.37 Set CD-ROM Speed(1) (DAh)
Operation code is (DAh).
The Set CD-ROM Speed command provides a means for initiator to set the spindle motor speed.
Speed Field Value Description
00h : Normal Speed
01h : 2x Speed
03h : 4x Speed
FFh : Maximum Speed
Other Value : Any other value not specified will set the drive to maximum Speed
Drive Differences:
DRM-602x The DRM-602x does not support 4x speed. A speed setting value of 03h
will not cause an error, but set the drive to 2x speed.
DRM-624x, DRM-604x, DR-U124x, DR-UA124X, and DR-D504X
These drives do not support 2x Speed. A speed setting value of 01h will not cause an error.
However, the drive will automatically be set to 4x speed.