
90
EPC
®
-6320/21
Glossary
H A R D W A R E
R E F E R E N C E
GB or GByte
(Gigabyte) Approximately one billion (US) or one thousand million (Great Britain)
bytes. 2^30 = 1,073,741,824 bytes exactly.
h
(Hexadecimal) A base-16 numbering system using numeric symbols 0 through 9 plus
alpha characters A, B, C, D, E, and F as the 16 digit symbols. Digits A through F are
equivalent to the decimal values 10 through 15.
hang
A condition where the system microprocessor suspends processing operations due to
an anomaly in the data or an illegal instruction.
header
A mechanical pin and sleeve style connector on a circuit board. The header may exist in
either a male or female configuration. For example, a male header has a number and
pattern of pins which corresponds to the number and pattern of sleeves on a female
header plug.
host bus
The address/data bus that connects the CPU and the chipset.
I/O
(Input/Output) The communication interface between system components and
between the system and connected peripherals.
IDE
(Integrated Drive Electronics) A hard disk drive/controller interface standard. IDE drives
contain the controller circuitry at the drive itself, as compared to the location of this
circuitry on the computer motherboard in non-IDE systems. IDE drives typically connect
to the system bus with a simple adapter card containing a minimum of on-board logic.
INT
(Interrupt Request) A software-generated interrupt request.
IRDA or IrDA
(Infra-red Data Association) A specification for high-speed data communication using
infrared drivers and receivers for short-range wireless data transmission.
IRQ
(Interrupt Request) In ISAbus systems, a microprocessor input from the control bus
used by I/O devices to interrupt execution of the current program and cause the
microprocessor to jump to a special program called the interrupt service routine. The
microprocessor executes this special program, which normally involves servicing the
interrupting device. When the interrupt service routine is completed, the
microprocessor resumes execution of the program it was working on before the
interruption occurred.
ISA
(Industry Standard Architecture) A popular microcomputer expansion bus architecture
standard. The ISA standard originated with the IBM PC when the system bus was
expanded to accept peripheral cards.
ISR
(Interrupt Service Routine) A program executed by the microprocessor upon receipt of
an interrupt request from an I/O device and containing instructions for servicing of the
device.
jumper
A set of male connector pins on a circuit board over which can be placed coupling
devices to electrically connect pairs of the pins. By electrically connecting different pins,
a circuit board can be configured to function in predictable ways to suit different
applications.
KB or KByte
(Kilobyte) Approximately one thousand bytes. 2
10
= 1024 bytes exactly.
LBA
(Logical Block Addressing) A method the system BIOS uses to reference hard disk data
as logical blocks, with each block having a specific location on the disk. LBA differs from
the CHS reference method in that the BIOS requires no information relating to disk
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com