Glossary-12
GLOSSARY
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.
SIO: Serial Input/Output. The
electronic methodology used in serial
data transmission.
soft key: Key combinations that
emulate keys on the IBM keyboard,
change some configuration options,
stop program execution, and access
the numeric keypad overlay.
software: The set of programs,
procedures and related documentation
associated with a computer system.
Specifically refers to computer
programs that direct and control the
computer system’s activities. See
also hardware.
stop bit: One or more bits of a byte
that follow the transmitted character
or group codes in asynchronous serial
communications.

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.