IBM System/370 Operator's Reference Manual page 233

Glossary
Sources: SR20-1078 System/360 Operator's Reference Guide
GC33-5380 DOSNS Service Aids and Procedures
GC20-1699 DP Glossary
NOTE: Asterisk before term indicates American National Standard Institute (ANSI)
definition.
a
access method: A technique for moving data between main storage and an input/output
device.
address constant: A number, or a symbol representing a number, used in calculating storage
addresses.
address translation: The process of changing the address of an item of data or an instruction
from its virtual address to its real storage address. See also dynamic address translation.
alias: Another name for a member of a partitioned data set; another entry point of a program.
allocate: Assign a resource to a job or task.
asynchronous: Without regular time relationship; unexpected or unpredictable with respect
to the execution of a program's instructions.
attribute: A trait; for example, attributes of data include record length, record fermat, data
set name, associated device type and volume identification, use, creation date, etc.
auxiliary storage: Data storage other than main storage. Synonymous with external storage,
secondary storage.
b
basic access method: Any access method in which each input/output statement causes a
machine input/output operation to occur. (The primary macro instructions used are READ
and WRITE.)
basic control mode: When PSW bit 12 is 0, PSW format and system operation are compatible
with standard System/360 operation. This isthe basic control mode in which control registers
0,8, and 14 are available to the system. Abbreviated to BC mode. See also "Extended Con·
trol Mode."
batch processing: (See stacked job processing.)
block (records): 1. To group records to conserve storage space or to increase the efficiency
of access or processing. 2. A blocked record. 3. A portion of a telecommunications message
defined as a unit of data transmission.
block loading: Bringing the control section of a load module into adjoining positions of
main storage.
BT AM (basic telecommunications access method): A basic access method that permits a
READIWRITE communication with remote devices.
buffer (program input/output): A portion of main storage into which data is read, or from
which it is written.
c
catalog: 1. The collection of all data set indexes maintained by data management. 2. To in·
elude the volume identification of a data set in the catalog. 3. In DOS to add a program to a
library.
cataloged data set: A data set that is represented in an index or series of indexes.
cataloged procedure: A set of job control statements in the SYS1.PROCLIB data set. The
procedure can be used by naming it in an execute (EXEC) statement.
CAW (channel address word): A ward in main storage at location 72 that specifies the loca-
tion in main storage where a channel program begins.
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