Emerson MVME147 manual 3½, 5¼, 250K B/S Data

7

SCSI PACKETS

	3½, 5¼	3½, 5¼, 8	3½, 5¼	3½, 5¼
	250K B/S Data	500K B/S Data	250K B/S Data	500K B/S Data
	Rate	Rate	Rate	Rate
Step Rate	0	0	0	0
Heads	2	2	2	2
Precompensation	$50 (Note 1)	$50 or $4D 8 in.	$28	$50
Cylinder
Sectors/Track	$10	$1A	$9	$0F
Attribute Word	$0203	$020B	$0281	$028B
Controller Type	$0F	$0F	$0F	$0F
Drive Type	0	0	0	0
Function Code	$78	$78	$78	$78
Interrupt Level	$02 (Note 2)	$02 (Note 2)	$02 (Note 2)	$02 (Note 2)
Return Vector	$4E (Note 2)	$4E (Note 2)	$4E (Note 2)	$4E (Note 2)
Retry Count	$03	$03	$03	$03
Physical Bytes/	$100	$100	$200	$200
Block
Pointer to Work	$10000	$10000	$10000	$10000
	(Note 2)	(Note 2)	(Note 2)	(Note 2)
Logical Bytes/	$100	$100	$200	$200

Block
NOTE:	1.	Refer to drive specification.
	2.	Up to user.

New Packet

Even Byte \

Odd Byte \

	FC		B8	74		30
+$00		Controller LUN			Device LUN
+$02		Status Byte 0			Status Byte 1 (Note 1)

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