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Radio frequency interference (RFI) shield
R
Radio frequency interference (RFI)
shield: A metal shield enclosing the
printed circuit boards of the printer or
computer to prevent radio and TV
interference. All computer equipment
generates radio frequency signals.
The FCC regulates the amount of
signals a computing device can allow
past its shielding. A Class A device is
sufficient for office use. Class B
provides a more stringent classifica-
tion for home equipment use.
TOSHIBA portable computers comply
with Class B computing device
regulations.
Random Access Memory (RAM):
High speed memory within the
computer circuitry that can be read or
written to.
restart: Resetting a computer without
turning it off (also called "warm boot"
or "soft reset"). See also boot.
RGB: Red, green, and blue. A device
that uses three input signals, each
activating an electron gun for a
primary additive color (red, green, and
blue) or port for using such a device.
See also CRT.
RJ11: A modular telephone jack.
RJ45: A modular LAN jack.
Glossary-12
ROM: Read Only Memory: A
nonvolatile memory chip manufac-
tured to contain information that
controls the computer's basic
operation. You cannot access or
change information stored in ROM.
S
SCSI: Small Computer System
Interface is an industry standard
interface for connection of a variety of
peripheral devices.
SD cards: Secure Digital cards are
flash memory widely used in a variety
of digital devices such as digital
cameras and Personal Digital Assis-
tants.
serial communications: A communi-
cations technique that uses as few as
two interconnecting wires to send bits
one after another.
serial interface: Refers to a type of
information exchange that transmits
information sequentially, one bit at a
time. Contrast: Parallel interface.
SIO: Serial Input/Output. The
electronic methodology used in serial
data transmission.
SmartMedia: Write-protectable, flash-
memory cards that are used in
computers and a variety of external
devices such as digital cameras. They
are PCMCIA compatible.
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