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60330800 A
Alarm (A5 = 1 ):
This status bit monitors those conditions requiring the at-
tention of the program or the operator.
The following conditions set this bit
as well as their own status bit:
1)
End of Tape,
2)
Parity Error,
3)
Lost data,
4)
Ready, i. e., change in Ready status is sensed at a time other than
a Unit Select operation, or
5)
File mark/Tape mark.
Lost Data (A6 =
0:
The Data Transfer register was not empty when a new
frame of data was received from the tape transport.
This status bit sets
only during a Read operation. A Lost Data condition causes all further data
requests to be rejected and the Data interrupt to be disabled.
Parity status
is valid at the end of operation. A new Control Function or a new Unit Se-
lection can be used to clear the Lost Data condition.
Protected (A 7 = 1):
The PROGRAM PROTECT switch of the selected tape
transport is enabled.
Parity Error (A8 = 1):
An error was detected during data transfer or the
controller has written a file mark or done a Read operation in the wrong
mode. The parity check is complete and Parity Error status is valid at end
of operation.
Parity is not checked on backspace.
This condition responds
to transverse, longitudinal, and cyclic redundancy parity errors.
End of Tape (A9
1):
An end of tape marker has been sensed.
Load Point (Ai 0 = 1 ):
The tape load point has been sensed.
File Mark/Tape Mark (All
0:
A file mark or tape mark has been sensed.
Controller Active (A12 =
0:
1732 is Active controlling tape motion.
Con-
troller remains active approximately 5.5 ms after End of Operation follow-
ing a Write or Write File Mark/ Tape Mark operation, approximately
4
ms
after an End of Operation following a Read or a Search File Mark/ Tape
Mark operation, and approximately 6 ms (609) or 9.5 ms (608) after an End of
Operation following a backspace or Search File Mark/ Tape Mark backward.
Fill (A13=1):
If an odd number of tape words is read, this
status will be set to indicate that the lower portion of the word
read is not a tape word.
It
clears on New Function Clear, Clear
Controller, Master Clear or Unit Clear.
17
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