multiprogramming. (1) Pertaining to the concurrent execution
of
two or more computer programs by a computer. (2) A mode of
operation
that
provides for the interleaved execution
of
two
or
more computer programs by a single processor.
~
n.
Prefix nano;
0.000000001.
NAND. A logic operator having the property
that
if P
is
a
statement,
Q
is
a statement, R is a statement, ... , then the
NAND
of
P, Q ,R, ...
is
true if at least one statement
is
false, false if all
statements are true.
NAND gate. A gate in which the output
is
0 only if all inputs are
1.
nano (n). Prefix 0.000
000
001.
nanosecond (ns).
0.000000001
second.
~
negative true. Synonym for active low.
negative-going edge.
The
edge
of
a pulse
or
signal changing in a
negative direction. Synonymous with falling edge.
non-return-to-zero change-on-ones recording (NRZI). A
transmission encoding method in which
the
data terminal
equipment changes the signal to the opposite state to send a
binary
1
and
leaves it in the same state to send a binary
o.
non-return-to-zero (inverted) recording (NRZI). Deprecated term
for non-return-to-zero change-on-ones recording.
NOR. A logic operator having the property that if P
is
a
statement,
Q
is
a statement, R is a statement, ... , then the
NOR
of
P,
Q,
R, ...
is
true if all statements are false, false if
at
least one
statement
is
true.
NOR
gate. A gate in which the output
is
0 only if
at
least one
input is
1.
Glossary-23