IBM AT 5170 Technical Reference page 471

(2) A packaged functional hardware unit designed for use with
other components.
modulo check. A calculation performed on values entered into a
system. This calculation is designed to detect errors.
modulo-N check. A check in which an operand is divided by a
number N (the modulus) to generate a remainder (check digit)
that is retained with the operand. For example, in a modulo-7
check, the remainder will be 0, 1,2,3,4,5, or 6. The operand is
later checked by again dividing it by the modulus; if the
remainder is not equal to the check digit, an error is indicated.
modulus.
In a modulo- N check, the number by which the
operand is divided.
monitor. Synonym for cathode ray tube display (CRT display).
most-significant digit. The leftmost (non-zero) digit. See also
high-order position.
ms. Millisecond; 0.001 second.
multiplexer. A device capable of interleaving the events of two
or more activities, or capable of distributing the events of an
interleaved sequence to the respective activities.
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; 0.000,000,001.
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.
Glossary-2S