IBM magstar mp 3570, Maintenance Information

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Glossary
This glossary defines the special terms, abbreviations,
and acronyms that are used in this publication. If you
do not find the term you are looking for, refer to the
index or to the
Dictionary of Computing, New York:
McGraw-Hill, 1994.
A
ac. Alternating current.
access method. A technique for moving data between
main storage and input or output devices.
ACF. Automatic cartridge facility.
adj. Adjustment.
AEN. Asynchronous event notification.
AIX. Advanced Interactive Executive. IBM’s
implementation of the UNIX operating system. The
RS/6000 system, among others, runs the AIX operating
system.
alter. To change.
ANSI. American National Standards Institute.
ASCII. American National Standard Code for
Information Interchange. A 7-bit coded character set (8
bits including parity check) that consists of control
characters and graphic characters.
assigning a device. The establishing of the
relationship of a device to a running task, process, job,
or program.
assignment. The naming of a specific device to
perform a function.
assistance. Aid.
asynchronous. Pertaining to two or more processes
that do not depend upon the occurrence of specific
events such as common timing signals.
attention (notice). A word for calling attention to the
possibility of danger to a program, device, or system, or
to data. Contrast with
caution and danger.
ATTN. Attention.
B
backhitch. Magnetic tape that makes a slight
backward motion just prior to moving forward.
backup. To make additional copies of documents or
software for safekeeping.
BCR. Buffer channel remainder register.
BCSE. Buffer channel status/error register.
BDSE. Buffer device status/error register.
beginning-of-tape (BOT). The location on a magnetic
tape that indicates the start of the permissible recording
area.
bezel. Decorative and safety cover.
bi-colored. Having two colors.
BM or bill of materials. A list of specific types and
amounts of direct materials expected to be used to
produce a given job or quantity of output.
BOB. Beginning-of-block.
BOT. Beginning-of-tape.
buffer. A routine or storage used to compensate for a
difference in rate of flow of data or time of occurrence
of events, when transferring data from one device to
another.
bus. A facility for transferring data between several
devices located between two end points, only one
device being able to transmit at a given moment.
C
caution (notice). A word to call attention to possible
personal harm to people. Contrast with
attention and
danger.
CCW. Channel command word.
CCW chain. A list of channel command words to be
performed in sequence.
CE. Customer engineer; field engineer; service
representative.
CEM. customer engineering memorandum.
CER. Channel error register.
GLOSSARY
Copyright IBM Corp. 1998
Gloss-1