MAI Basic Four 2000 Series, Service Manual

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BFISD 8079
Table 9-17. Extent Descriptor List
BIT 7 6 5 4 3 2 1 0
Byte 0 0 0 0 0 0 0 0 0
Byte 1 0 0 0 0 0 0 0 0
Byte 2 0 0 0 0 0 0 0 0
Byte 3 0 0 0 0 0 0 0 0
Byte 4 0 0 0 0 0 0 0 0
Byte 5 Block Size (MSB)
Byte 6 Block Size
Byte 7 Block Size (LSB)
Table 9-18. Drive Parameter List
BIT 7 6 5 4 3 2 1 0
Byte 0 List Format Code == 01
Byte 1 Cylinder Count (MSB)
Byte 2 Cylinder Count (LSB)
Byte 3 Data Head Count
Byte 4 Reduced Write Current Cylinder (MSB)
Byte 5 Reduced Write Current Cylinder (LSB)
Byte 6 Write Precompensation Cylinder (MSB)
Byte 7 Write Precompensation Cylinder (LSB)
Byte 8 Landing Zone Position
Byte 9 Step Pulse Output Rate Code
The Landing Zone Position is used with the Start/Stop command to indicate
the direction and number of cylinders from the last data cylinder to the
shipping position. The most significant bit indicates the direction, with
a zero meaning that the landing zone is beyond the highest track, and a
one indicates the landing zone is outside track 00. The low seven bits
gives the number of cylinders. The default value is zero (land on inner-
most track).
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