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Helios System Board Manual
ISA - An acronym for Industry Stan-
dard Architecture. A well-established
bus standard that originated with the
IBM AT. See
PCI and VESA Local Bus.
LM75
- The LM75 is a temperature
sensor. The host can query the LM75
at any time to read the temperature.
Its 3.0V to 5.5V supply voltage range,
low supply current and I
2
C interface,
make it ideal for a wide range of appli-
cations.
LM79 - The LM79 is a highly inte-
grated Data Acquisition system for
hardware monitoring of servers, per-
sonal computers or virtually any micro-
processor based system. In a PC, the
LM79 can be used to monitor tempera-
tures, power supply voltages and fan
speeds.
NS
- An acronym for Nanosecond. One
billionth of a second. Measure of the
access time of RAM.
Parallel Port - A connection for a
printer or similar peripheral. Generally,
parallel ports are output only. See Bi-
directional Parallel Port and ECP.
Parity - Logic that detects the presence
of an error in memory. Generally, a
single parity bit is used for each byte (8
bits) of data. The most commonly used
forms of parity are even parity, odd par-
ity and checksums.
PC100 SDRAM - Intel’s latest BX
chipset and associated system boards
increase the memory bus speed from 66
to 100 MHz. Completely new SDRAM
DIMM modules are necessary to meet
the enhanced speed requirement.
These are called PC100 modules. The
PC100 specification defines very strin-
gent design rules for these 100MHz
modules. Only DIMM’s designed to
meet this requirement will work cor-
rectly in 100MHz system boards.
PCI - An acronym for Peripheral Com-
ponent Interconnect. A high perfor-
mance 32-bit or 64-bit bus developed
by Intel Corporation. PCI is
designed to be independent of the hard-
ware architecture to ensure compatibil-
ity with future computer systems. See
VESA Local Bus and ISA.
Pentium - A high performance 64-bit
CISC processor designed and manufac-
tured by Intel Corporation.
Pipeline - In DRAMs and SRAMs, a
method for increasing the performance
using multistage circuitry to stack or
save data while new data is being ac-
cessed.
Plug and Play - A standard developed
to ensure easy installation of peripher-
als. Theoretically, a newly installed card
will automatically configure itself and
work properly without requiring jumper
configuration or device drivers.
POST - An acronym for Power On Self
Test. A diagnostic program that is run
whenever the system is cold booted.
RAM - An acronym for Random
Access Memory. A type of memory that
is used as the “working memory” of a
computer system. See DRAM and
SRAM.
Glossary
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