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Below is shown the command word format for positioning an arm to a desired track and frame.
18
17
16
15
14
13
12
11
Not Used
1 0 Position Command
Must be Zero
12
11
10
9
8
7
6
5
4
3
2
1
Position
Command
All zeros
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
LFrame
1F
Arm Position
Arm Number
of the Disc File
Command Word 1
Command Word 2
Command Word 3
=
Read Next Frame
Selection of the frame to be transferred also automatically selects the head which is to perform
the read or write operation. Each of the eight heads on the positioning arm can read a specified
number of frames as follows:
Frame Number
Per Arm Position
0 -
7
8 - 15
16 - 23
24 - 31
32 - 47
48 - 63
64 - 79
80 - 95
Head Number
0
1
2
3
4
5
6
7
[ID&\lf
&~(glf
c:J
~@------------
V-38
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