Adaptec AHA-2740W User Manual page 111

ISA
Industry Standard Architecture
expansion bus. A type of com-
puter bus used in most PCs. ISA
enables expansion devices like
network cards, video adapters,
and modems to send data to and
receive data from the PC's CPU
and memory 16 bits at a time.
Expansion devices are plugged
into sockets in the PC's mother-
board. ISA is sometimes called
the AT bus, because it was origi-
nally introduced with the IBM
PC-AT in 1983.
K
KByte
Kilobyte. A measure of com-
puter storage. One KByte equals
1024 bytes. (A byte is the
amount of storage needed to
hold one character.)
L
Logical Unit
A physical or virtual device
addressed through a target. Each
target can have up to eight Logi-
cal Units.
Logical Unit Number
An encoded 3-bit identifier for a
logical unit.
LU
See Logical Unit
LUN
See Logical Unit Number
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AHA-2740W/2742W/2744W User's Guide
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Current Date: 8/3/94
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M
Manager
See ASPI Manager.
MByte
Megabyte. A measure of com-
puter storage. One MByte equals
1,048,576 bytes. (A byte is the
amount of storage needed to
hold one character.)
Micro Channel
A 32-bit computer bus standard
introduced by IBM with the
PS/2 series of PCs. Micro Chan-
nel is an extension of the 16-bit
ISA standard, allowing expan-
sion devices to move data 32 bits
at a time on the PC bus (also
called Micro Channel
architecture).
Multitasking Operation
The execution of commands in
such a way that more than one
command is in progress at the
same time. Multitasking allows
a computer system to take
advantage of overlapping activi-
ties by using resources that are
temporarily not required for
other operations. More than one
program or more than one por-
tion of a program may be oper-
ating in parallel.
Multithreaded I/O
A method by which data is
accessed simultaneously from
multiple SCSI devices to
increase a system's data transfer
rate. For example, if the system
needs data from two disk
Page: Glossary-5
ECN Date: 8/9/94
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Glossary
Glossary-5
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