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Table 9
Removable Disk Storage System Testing Sequence
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Sequence and Summary Description
Condition Code, Status Response Bits and Detailed Description
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Recommended Corrective Action
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Step 1.
TIO 5,6 = 01 or 10.
x
Use Recovery .Procedure 3.
Performed only if TIO 5,6
f
00,
Not Defined, The controller is not ready immediately after an
1/0
x
x
Use Recovery Procedure 2.
indicating that controller is not
interrupt.
ready.
x
x
x
Use Recovery Procedure 4.
TIO 5,6 = 11.
x
Use Recovery Procedure 3.
Controller Busl'.. The controller hes foiled to return to the ready
state immediately after an 1/0 interrupt due to a hardware malfunc-
x
x
Use Recovery Procedure 2.
tion or the command list is coded with multiple interrupts.
x
x
x
Use Recovery Procedure 4.
Step 2.
TIO 1,2 = 01.
x
x x
x
x
x
Use Recovery Procedure 1.
Performed only if TIO 1,2
f
00,
Not
O~rctional.
The device has detected a hardware power failure
indicating that device is not ready.
or has lost the heed position integrity.
TIO l,2 = 10.
x
x x
x
x
x
Use Recovery Procedure 1.
Not Available. The device is not available for usage through the
addressed controller for the dual access hardware configuration.
TIO 1,2 = 11.
x
Use Recovery Procedure 3.
Device Busl. The device did not return to the ready state. Normally,
x
x
Use Recovery Procedure 2.
the device is not busy when the controller is not busy. Even if the
heads are moving, the device is ready when the controller is ready.
x
x
x
Use Recovery Procedure
4.
Step 3.
TDV CC1,CC2 = 01.
x
x x
x
x
x
Use Recovery Procedure 1 .
Performed on I y if
Test Mode. The controller has been placed in the test mode either due
TDV CC1,CC2 = 01.
to a hardware failure or a programming error.
Step 4A.
1/0
Pcrity Error, The Error flog in the odd channel register indicates
x
Use Recovery Procedure 3.
that a parity error has been detected on bytes received during an input
Applicable for Sigma 3 computer
operation, or a memory parity error was detected on an output oper-
x
x
Use Recovery Procedure 2.
systems only.
ation. The following errors genercte an !OP Helt to the device
controller:
x x
x
Use Recovery Procedure 4.
Performed only if the Error flag
f
0,
indicating an IOP parity error.
"·
A memory parity error detected while fetching an order code from
memory on order-out.
b.
A memory parity error detected while fetching a new IOCD
from memory during a data chaining operation.
Step 48.
TDV 11 = 1.
x
Use Recovery Procedure 3.
Applicable for Sigma 5-9 computer
Memorl'.'.: Address Error. This error may be due to a hardware malfunc-
x
x
Use Recovery Procedure 2.
systems on I y.
tion or to a programming error.
x
x
x
Use Recovery Procedure 4.
Performed only if TDV 10, 11, 12,
end 13
f
0000, indicating an IOP
TDV 12 = 1.
x
Use Recovery Procedure 3.
operotiona I error.
l OP Memory Error. This error is due to a hardware malfunction.
x
x
Use Recovery Procedure 2.
x
x
x
Use Recovery Procedure 4.
TDV 13 = 1.
x
Use Recovery
Pr~edure
3.
.,
I OP Control Error. This error is due to a hardware malfunction or
x
x
Use Recovery Procedure 2.
to a programming error.
x
x
x
Use Recovery Procedure
4.
TDV10=1.
x
Use Recovery Procedure 3.
Transmission Memory Error. This error is due to a hardware
x
x
Use Recovery Procedure 2.
malfunction.
x
x
x
Use Recovery Procedure 4.
Step 5.
Sector Unavailoble. The surface address of the Seek operation is
x
Use Recovery Procedure 3,
outside the range of available sectors, or the current surface oper-
Performed only if TDV 2
f
0.
otion hos been aborted because the previous surface operation has
x
x
x
Use Recovery Procedure 4.
incremented the surface address across a cylinder boundary. Both
conditions are programming errors.
26
I/O Faults and Recovery Procedures
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