Emerson MVME147 manual attributes byte offset

						Attach/Detach Packet (all devices)
								attributes (byte offset
								$10).
$29			xxxxxxxx					Alternate cylinders
								defines the number of
								alternate cylinders
								per disk that are to be
								reserved at the end of
								the disk for
								alternates.
	NOTE:			1.			Refer to Chapter 3.
	Old Packet Supported for Compatibility
	Even Byte \
	Odd Byte \
		FC			B8		74		30
	+$00			Controller LUN				Device LUN
	+$02			Status Byte 0			Status Byte 1 (Note 1)
	+$04		0		0			Step Rate
	+$06		0		0		Number of Heads
	+$08				Number of Cylinders
	+$0A				Precompensation Cylinder
	+$0C				Logical Sectors per Track
	+$0E		0		0		0		0
	+$10				SCSI Disk Attributes
	+$12			Controller Type				Drive Type
	+$14		0		0		Function Code (08, 0C)
	+$16			Interrupt Level			Vector Number
	+$18			Status Byte 2			Status Byte 3 (Note 1)
	+$1A		0		0			Retry Count
	+$1C				Physical Bytes per Block
	+$1E		Alt Sectors per Zone				No. Alt Cyls to Reserve

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