Specifications

INPUT/OUTPUT STATEMENTS
6
Three types of input/output equipment diagnostics are
provided.
• The basic failure message (LV xx FAILED yy) that
specifies the unit (xx) that failed and the code (yy) that
specifies the failure cause
• Other failure messages produced by a few controllers
(special messages)
• Status information. In this manual, only those status
words are described that are readily available to the
user; i.e., the engineering log
status (PHYSTB, word 12)
and
other status words saved in PHYSTB.
The first and second types of diagnostics are produced for
all input/output devices. For additional information
on the
status words, the hardware maintenance manual for the
individual device should be consulted.
BASIC EQUIPMENT MALFUNCTION
When a system input/output device driver has detected an
error,
the alternate device handler is called. The alternate
device handler prints the following diagnostic message on
the standard comment device if no alternate device is
defined:
LV,nn FAILED xx
ACTION
Where:
nn is the number of the logical unit that failed
xx is the failure code.
Respond
to the error by typing one of the following:
RP To repeat the request
CU
CD
DU
DD
To report the error to the requesting program; the
device is allowed to continue processing requests.
To cause any future programs calling the device to
be informed of the failure by their completion
addresses. The
error is reported to the calling
program and the device is marked down.
No
subsequent attempt is made to operate this device.
To activate control unit and suspend job processing.
If job processing is not
in progress, this action is
not taken and
ACTION is retyped. Another option
may be selected.
To
activate control unit and suspend job processing.
If job processing is not
in progress, this action is
not taken and ACTION is retyped. Another option
may be selected.
96769450 B
DEVICE FAILURE CODES
Device Failure
Code and Error
o Time-out
1 Lost
data
2 Alarm
Significance/ Action
I
Failure to interrupt within the allot-
ted time (requires TIMER package)
. Teletype: The
operator failed to
supply input within the
allotted time.
Ignore the message and continue nor-
mally.
All
other devices: The hardware
failed
to generate an interrupt within
the allotted time. Hardware main-
tenance is required.
Data was not
transferred out of the
read
register before the next data
word appeared.
1711/1713 Teletypewriter: Retype
the
statement.
1829-30/60 Card Reader (diagnostic
logic unit only): bad initiator
status
1833-5 Flexible Disk: bad initiator
pseudo
status
Magnetic tape: Use the control unit
option
to continue without processing
the lost record or
abort the read
option.
Indicates the presence of an abnormal
condition
1713 Paper Tape Reader: paper tape
motion failure. No change in the
feed hold circuit has occurred for 40
milliseconds while trying to read. If
not the end-of-tape, manually posi-
tion the paper
tape so that the end of
the next to last record and the
beginning of the
last record are on
opposite sides of the photocells. If
end-of-tape, take the control unit
option.
Paper tape punch: paper tape supply
low or
tape break. Abort the punch
operation and
correct the problem.
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