IBM 5150 Hardware Reference Manual page 364

56. Low order position: The rightmost position in a string of
characters.
57. Machine Language: (1) A language that is used directly by a
machine. (2) Another term for computer instruction code.
58. Memory Address: A two-byte value selecting one specific
r--...,
memory location on a memory map.
59. Memory Location: The most specific part of a memory map
that the computer can refer to.
60. Memory Map: The list ofmemory locations addressed directly
by the microprocessor.
61. MEMR: Memory Read Command. (Refer to System Board
I/O Channel Descriptions).
62. MEMW: Memory Write Command. (Refer to System Board
I/O Channel Descriptions).
63. MFM Coded: Modified Frequency Modulation. It is double
density encoding of information on a diskette.
64. Mhz: Megahertz. A unit of frequency equal to one million
Hertz.
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65. Microprocessor: A processing unit, or part of a processing unit,
that consists ofmicrocode. In the IBM Personal Computer, the
microprocessor is the Intel-8088.
66. Mnemonic: Symbol or symbols used instead of terminology
more difficult to remember. Usually a mnemonic has two or
three letters.
67. Mode: (1) A method of operation; for example, the binary
mode, the interpretive mode, the alphanumeric mode. (2) The
most frequent value in the statistical sense.
68. Monitor: (1) A device that observes and verifies the operation
of a data processing system and indicates any specific depart ­
ure from the norm. (2) A television type display such as the
IBM Monochrome Display. (3) Software or hardware that
observes, supervises, controls, or verifies the operations of a
system.
69. Multiplexer: A device capable of interleaving the events oftwo
or more activities or capable of distributing the events of an
interleaved sequence to their respective activities.
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