Commodore 128D - Page 406

Dimension: The property of an array that specifies the direction
along an axis in which the array elements are stored. For exam- , .
pie, a two-dimensional array has an X-axjs for rows and a Y-axis 1—I
for columns. See Array.
Direct Mode: The mode of operation that executes BASIC com- (—>
mands immediately after the RETURN key is pressed. Also
called immediate Mode. See Command.
lJ
Direct Connect Modem: A device that converts digital signals from
a computer into electronic impulses for transmission over tele- } (
phone lines. Contrast with Acoustic Coupler. \—'
Disable: To turn off a bit, byte or specific operation of the computer.
Disk Drive: A random access, mass-storage device that saves and
loads files to and from a floppy diskette.
Disk Operating System: Program used to transfer information to
and from a disk. Often referred to as a DOS.
Duration: The length of time a musical note is played.
Electronic Mail or E-Mail: A communications service for computer
users where textual messages are sent to a central computer,
or electronic "mail box," and later retrieved by the addressee.
Enable: To turn on a bit, byte or specific operation of the computer.
Envelope Generator: Portion of the Commodore 128 that produces
specific waveforms (sawtooth, triangle, pulse width and noise)
for musical notes. See Waveform.
EPROM: A PROM that can be erased by the user, usually by expos
ing it to ultraviolet light. See PROM.
Error Checking or Error Detection: Software routines that identify,
and often correct, erroneous data.
Execute: To perform the specified instructions in a command or
program statement.
Expression: A combination of constants, variables or array ele
ments acted upon by logical, mathematical or relational opera
tors that return a numeric value.
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402 GLOSSARY