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User’s Manual Glossary-13
L550/L550D/L555/L555D
RJ11: A modular telephone jack.
RJ45: A modular LAN jack.
Read Only Memory (ROM): Non-volatile memory that can be read but not
written to. Non-volatile here means that information in ROM remains
whether or not the computer is receiving power. This type of
memory is used to store your computer’s BIOS, which is essential
instructions the computer reads when you start it up. See also BIOS,
memory. Compare RAM.
S
S/P DIF: A standard of digital interface for audio.
SCSI: Small Computer System Interface is an industry standard interface
for connection of a variety of peripheral devices.
SD/SDHC memory card: Secure Digital cards are flash memory widely
used in a variety of digital devices such as digital cameras and
Personal Digital Assistants.
SECAM L: SECAM (Sequential Color Memory) is a broadcasting standard
used in France.
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.
synchronous: Having a constant time interval between successive bits,
characters or events.
system disk: A diskette that contains the operating system files needed to
start the computer. Any diskette can be formatted as a system disk.
A system disk is also called a “bootable disk”, “boot disk” or a
“startup disk.” Compare non-system disk.
T
telephony: the transmission of speech or sounds between two distant
points with or without the use of wires, particularly a telephone.
terminal: A typewriter-like keyboard and CRT display screen connected to
the computer for data input/output.