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ISA
Industry Standard Architecture. The bus architecture used in
the IBM PC/XT and PC/AT. The AT version of the bus is
called the AT bus and has become an industry standard. The
apparent successor is the PCI local bus architecture found in
most of today's computers. Most modern computers include
both an AT bus for slower devices and a PCI local bus for
devices that need better bus performance. In 1993, Intel and
Microsoft introduced a new version of the ISA specification
called Plug and Play ISA. Plug and Play ISA enables the
operating system to configure expansion boards automatically
so that users do not need to fiddle with DIP switches and
jumpers. See plug and play.
isochronous
A form of data transmission in which individual characters are
only separated by a whole number of bit-length intervals.
K
kilobyte
(KB) 1024 bytes.
L
L2 cache
Refers to "level 2" or "secondary" cache. A type of cache that
resides on the motherboard except when referring to a Pentium
II machine, where it resides on the CPU module.
LAN
Local Area Network.
LPT1
Name assigned to the parallel port by the Windows operating
system. A second parallel device is assigned LPT2 (if there is
another parallel port). Also called the printer port.
16 Glossary
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