IBM L3 User Manual download pdf (Page 170)

Glossary-4 User’s Manual

L350/L350D

buffer: The portion of the computer’s memory where data is temporarily

stored. Buffers often compensate for differences in the rate of flow

from one device to another.

bus: An interface for transmission of signals, data or electric power.

byte: The representation of a single character. A sequence of eight bits

treated as a single unit; also the smallest addressable unit within

the system.

cache memory: High speed memory which stores data that increases

processor speed and data transfer rate. When the CPU reads data

from main memory, it stores a copy of this data in cache memory.

The next time the CPU needs that same data, it looks for it in the

cache memory rather than the main memory, which saves time. The

computer has two cache levels. Level one is incorporated into the

processor and level two resides in external memory.

capacity: The amount of data that can be stored on a magnetic storage

device such as a floppy diskette or hard disk drive. It is usually

described in terms of kilobytes (KB), where one KB = 1024 bytes

and megabytes (MB), where one MB = 1024 KB.

card: Synonym for board. See board.

CardBus: An industry standard bus for 32-bit PC Cards.

CD-ROM: A Compact Disc Read Only Memory is a high capacity disc that

can be read from but not written to. The CD-ROM drive uses a laser,

rather than magnetic heads, to read data from the disc.

CD-R: A Compact Disc Recordable disc can be written once and read

many times. See also CD-ROM.

CD-RW: A Compact Disc ReWritable disc can be rewritten many times.

See also CD-ROM.

character: Any letter, number, punctuation mark, or symbol used by the

computer. Also synonymous with byte.

chassis: The frame containing the computer.

chip: A small semiconductor containing computer logic and circuitry for

processing, memory, input/output functions and controlling other

chips.

CMOS: Complementary Metal-Oxide Semiconductor. An electronic circuit

fabricated on a silicon wafer that requires very little power.

Integrated circuits implemented in CMOS technology can be tightly

packaged and are highly reliable.

cold start: Starting a computer that is currently off (turning on the power).

COM1, COM2, COM3 and COM4: The names assigned to the serial and

communication ports.

commands: Instructions you enter at the terminal keyboard that direct the

actions of the computer or its peripheral devices.

communications: The means by which a computer transmits and receives

data to and from another computer or device.

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