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SCSI PACKETS
7-22
7
New Packet
Even Byte \
Odd Byte \
250K B/S Data 500K B/S Data 250K B/S Data 500K B/S Data
Rate Rate Rate Rate
Step Rate0000
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.
FC B8 74 30
+$00 Controller LUN Device LUN
+$02 Status Byte 0 Status Byte 1 (Note 1)
3½, 5¼ 3½, 5¼, 8 3½, 5¼ 3½, 5¼