L
laser: a device capable of producing a narrow beam of high intensity that can carry
data. (2-7e(1))
laser printer: a nonimpact printer that uses laser beams and electrophotographic
technology to form high-quality images. (2-le(1))
library: a collection of routines or programs, normally on disk, that may be readily
accessible for use by a computer. Most systems have several libraries. (1-18c(5))
light pen: a pen-shaped object with a light-sensitive cell at one end, used as an
alternative to the keyboard to communicate with the screen's electronics. (2-7f(c)(2))
Local Area Network (LAN): networks of computers and devices connected directly by
cable and not by communications lines. (3-17) local system: peripherals linked directly
to one or more CPUs. (3-17)
M
main storage: the internal storage of a computer from which instructions are executed;
the fastest storage of a computer. (2-Ba)
mainframe computer (maxicomputer): full-sized computer that handles a large
volume of data for hundreds of users. (3-19a)
*management information systems (MIS): a formal computer information network;
allows multiple users with different applications access to both routine reports and on-
the-spot information for decision-making. (3-3a)
mB (megabyte): 1,000,000 bytes; 1 mB equals 1,024K; RAM and disk capacity are
measured in megabytes. (2-6b(3)(c))
microcomputer: a very small computer, designed for use in small personal business
applications; often a special purpose, single-function computer on a chip. (3-21a)
semiconductor chip (more formal, rarely used name, "integrated circuit"). (3-21c(2))
minicomputer: a small computer somewhere in size between a largescale mainframe
computer and a microcomputer; with the components of a full-sized system but a
smaller memory. (The term is falling into disuse as the distinction between large and
"supermini" computers blurs.)(2-6b(3)(b)) 8 (3-20a)
**modem: a device that transmits and receives computer data over ordinary telephone
lines by changing digital signals into analog and vice versa. (3-21f(9)) & (4-9)
mouse: hand-held device used to alter the position of a cursor on the screen. Buttons
permit user to issue commands. (3-21b(1))
MD0057
G-5
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