IBM System/370 145 Reference Summary page 73

D
IFA IN-LINE TESTS
Select Test
0
Read Single Track
1
Restore Seek
2 Write Single Track
3 Disk Speed
4 Read Full Cylinder
5 Restore Seek
6 Write Full Cylinder
7 Cylinder Address Register
8 Chaining Test
9 Forward-Backward Seek
A Write Single Track
B
Sequential Seek
c
Chaining Test
D Backward-Forward Seek
E Write Full Cylinder
F Unsafe Condition
The specified test is performed once by the
diagnostic controls and then a 200-millisecond
time-out is taken to allow the customer's pro-
gram to regain control. The test is repeated at
the end of the time-out if the IFA control unit
is not busy. The diagnostic operation normally
stops with errors indicated on the CE panel.
The error indications can be disabled to allow
scoping or other observation of the operating
conditions.
WARNING
*In-line diagnostics should not be running when
customer performs an I PL.
*In-line diagnostics affect customer's throughput.
Record test results and analyze offline. Use FD
test box whenever possible.
HEX
01
02
02
04
04
08
08
08
09
OA
OB
oc
oc
OE
OF
10
11
13
FF
HEX
06
07
OA
Al
B-
C-
D-
E-
-2
-4
-8
SPECIAL CONDITION INDICATIONS
INDICATION
No Record Found.
Return to Head 00 Failed.
Failed to detect index at maximum interval
(Test 31
Return to Cylinder 000 Failed.
Index pulses occurring to close together. (Test 31
Seek 2nd Pass Failed (Dif not= Sw)
Index pulses occurring too far apart. (Test 3)
CAR failed to restore to original address. (Test 7)
CAR failed to reset to 00.
CAR failed to load to FF.
CAR failed to load to value in CE head/cylinder
switches.
Seek Fwd/Bkwd Diff of Sw Failed.
Index trap occurred before head cond1t1oning.
(Test 31
Write Test not Allowed (Def/Alt)
Head Selected not Equal to Switches.
No module selected.
Machine check during inline.
An RO key field was detached.
Gated attention failed to reset.
UNSAFE TEST INDICATIONS
INDICATION
Unsafe indicator set.
EOC indicator set.
Both unsafe and EOC set.
Failed to set EOC with advance to head-20
Force multiple head select (Y4 +VS).
Force read and erase gates.
Force write gate without erase gate.
Force erase gate and seek start.
Failed to reset Unsafe at index (with head·
tag and bus-out 11.
Failed to set Unsafe indicator.
Unsafe set at entry of force test.
HEX
21
to
3F
41
to
7F
81
to
FF
GENERAL STATUS INDICATIONS
INDICATION
Drive Read/Write Failure.
Bit-0 = 0
Bit-1=0
Bit-2 = 1
Bit-3 Write Current Failure.
Bit-4 Data Check Occurred.
Bit-5 Missing Address Mark.
Bit-6 High Compare Detected.
Bit-7 Low Compare Detected.
Control Unit failure.
Bit-0 = 0
Bit-1 = 1
Bit-2 Channel Data or Control Check.
Bit-3 Data or Command Overrun.
Bit-4 Cyclic Code Hardware Error.
Bit-5 Write Track Overrun.
Bit-6 Bus-Out Parity Error.
Bit-7 Serializer/Deserializer Error.
Disk status displayed.
Bit-0 = 1
Bit-1 Off Line
Bit-2 Unsafe.
Bit-3 Busy.
Bit-4 Pack change.
Bit-5 EOC detected.
Bit-6 Multi-module selected.
Bit-7 Seek incomplete.
RECOMMENDED TEST SEQUENCE
No.
Test Operation
7
Cylinder Address Register Test
3
Disk Speed Test
0
Read Single Track Test
4 Read Full Cylinder Test
F Unsafe Condition Test
2,A Write Single Track Test
6,E
Write Full Cylinder Test
1,5 Restore Seek Test
5.2