Control Data Corporation CYBER 170 Series Operator's Manual page 283

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Output File
The system-defined file which contains all the output
from job processing.
It
is also known as a print file.
Parity
In writing data, an extra bit is either set or cleared in
each byte so that every byte has either an odd number
of bits set (odd parity) or an even number of bits set
(even parity). Parity is checked when reading the data
for error detection and possible recovery.
Peripheral Processor (PP)
The hardware unit that performs input and output
through the data channels. They also perform many
system management tasks, .such as scheduling.
Permanent File
A
mass storage file cataloged by the system so that its
location and identification are always known to the
system. Permanent files cannot be destroyed
accidentally during normal operation (including
deadstart), and they are protected by the system from
unauthorized access according to privacy controls
specified when they are created.
Physical Record Unit (PRU)
The amount of information transmitted by a single
physical operation of a specified device. The size of a
PRU depends on the device, as follows:
Device
Mass storage
Tape in I form at or
in SI format with
binary data
Tape in other format
Size in Number
of 60-Bit Words
64
512
Size varies t
A PRU that has less than the previously listed words is
called a short PRU; a PRU that has no user data is
called a zero-length PRU.
Procedure File
A file containing control language and/or control
statements that can be saved and used again.
Pseudo A Register
A software register used by DSD to function channels
and to manipulate peripheral hardware devices from
the operator's console.
Remote Batch Job
A job submitted from a remote batch terminal.
Remote NPU
A network processing unit linked indirectly to a host
computer through other network processing units.
Rollout
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The act of removing a job from central memory before
execution is complete so memory can be assigned to
another job. A rolled out job loses its control point
assignment.
Rollout File
A file containing a job that is temporarily removed
from central memory.
Sector
~
A
sector is the same as a PRU. Refer to Physi.cal
Record Unit.
Step Mode
A
protected or debugging mode for the operating
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system monitor. The keyboard spacebar must be
pressed to process each PP request.
System Job
A
job brought to a control point by the operator.
System Library
The collection of tables and object language programs
residing in central memory or on mass storage which
are necessary for running the operating system and its
product set.
System Origin Job
A
job entered at the system console.
Time-Sharing Job
A
job initiated from a terminal.
Timed/Event Rollout File
A file containing a job that is temporarily removed
from central memory.
It
is rolled back into central
memory only when a specified event (such as a file is
no longer busy) or a specified time period has elapsed.
Trunk
The communication line connecting two network
processing uni ts.
Unit Number
The setting of a hardware device. Used when more
than one hardware unit can be connected to a
controller.
Upline
The direction of input flow from terminal to host
computer.
Warmstart
A procedure used to deadstart if the tape or disk
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controller is loaded and the control ware is running.
tRefer to the NOS Reference Manual, Volume 2, for the PRU sizes of tapes in other formats.
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