computer containing the circuits that control and perform the
execution of computer instructions.
Crunch: To minimize the amount of computer memory used to
store a program.
Cursor: The flashing square that marks the current location on the
screen.
Data: Numbers, letters or symbols that are input into the computer
to be processed.
Data Base: A large amount of data stored in a well-organized
manner. A data-base management system is a program that
allows access to the information.
Data Link Layer: A logical portion of data communications control
that mainly ensures that communication between adjacent
devices is error free.
Data Packet: A means of transmitting serial data in an efficient
package that includes an error-checking sequence.
Data Rate or Data Transfer Rate: The speed at which data is sent
to a receiving computer—given in baud, or bits per second
(bps).
Datassette: A device used to store programs and data files
sequentially on tape.
Debug: To correct errors in a program.
Decay: The rate at which the volume of a musical note decreases
from its peak value to a mid-range volume called the sustain
level. See Sustain.
Decrement: To decrease an index variable or counter by a
specific value.
Dedicated Line or Leased Line: A special telephone line
arrangement supplied by the telephone company, and
required by certain computers or terminals, whereby the
connection is always established (an exclusive, rented line).
GL-5
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