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'rABLE
3-3.
COMMANDS (CONTI 0)
Command
Definition/Function
Set Dia9Dostic
Escape (SDE)
'rag
1F
Bead Address
In Opper
(BIV)
'rag
20
Bead Address
In Lower
(BIL) 'rag 21
Cylinder Address
In Upper (CIU)
'rag 22
Cylinder Address
In Lower (ClL)
Tag 23
3-30
1 .. A control command.
2.
Enables the drive logic to perform special diagnostic functions
by
disabling the normal command repertoire (except for 'rag
15)
and conditioning the logic
to
receive to test and diagnostic
commands- (Tags 30 through 37).
3.
'I'his command inhibits the Sector Counter and sets Bit
7
(Device
in
Diagnostic Mode) of the Swamary Status byte.
4.
Drive is returned to normal operation
by
a Reset Diagnostic Mode
('rag
15)
or by the Device Initialize line going true.
1.
An
input information
collllllaDd.
2.
Causes the drive to return a byte of zeros on the bidirectional
data
lines.
1. An
input information
CODllDand..
2. Drive transfers its current head address to the controller via
the bidirectional data lines.
3. ':he bidirectional data lines decode as follows:
!!!
Decode
2
O·
BAR
1
21
BAR
2
22
BAR 4
2 3
BAR
8
24
BAR
16
2 5 _2 7
Not Used
1.
An
input information command.
2. Causes drive to place high order bits of current positioner lo-
cation on bidirectional data lines.
3. Bidirectional data lines are decoded as follows:
ill
Decode
2 0
CAR
256
21
CAR
512
22_27
Not Used
1.
An
input information command.
2. Causes drive to place 8 low order bits of current positioner
location on bidirectional data lines.
83318200
A
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