+multiple from FOLDOC

(MIMD) The classification under Flynn's taxonomy of a parallel processor where many functional units perform different operations on different data. Examples would be a network of workstations or transputers. Compare SIMD.

Last updated: 1994-11-08

Multiple Master

<text, tool, software>

(Or "Multiple Master Font") A font that is a mixture of two or more other fonts.

A Multiple Master font is a single font containing from two to sixteen master designs (the current implementation limit). A weight factor specifies the contribution of each master design for the creation of a multiple master font instance.

A Multiple Master instance is a single interpolation of a multiple master font as created by a user or application.

ATM Glossary.

Useable fonts.

Last updated: 1998-05-31

multiple perspective software development

<programming>

A decentralised approach to software development which, instead of adopting a monolithic representation and centralised control, models development in terms of collaboration between autonomous partial systems.

Software development usually involves people with different goals, expertise, and backgrounds, and the use of a wide range of formalisms, tools, and environments. As information is exchanged between participants, dependencies may be established between information created by them. Multiple perspective software development may be mapped into the transaction model which can be used to prevent uncoordinated access to interdependent information causing inconsistency.

[Fox Wai-Leung Poon]

Last updated: 1995-12-14

multiple value

<database>

(MU) A one-to-many relationship between entries in a database, for example a person may have an address field which spanned multiple records (with different indexes). Multiple values are a non-relational technique.

MUs have recently been made available in DB2, despite the product being so heavily influenced by Codd's Laws of relational databases.

[Confirm, clarify?]

Last updated: 1995-10-30

Multiple Virtual Storage

<operating system>

(MVS) Release 2 of OS/VS2, called MVS because it had multiple 16 MB virtual address spaces, in contrast to SVS. MVS ran on the IBM 390 series mainframes. It became MVS/SP, then MVS/XA (with 31-bit addressing) and then MVS/ESA.

MVS/Open Edition (MVS/OE), aimed at the growing open systems market, added TCP/IP and Unix support in an MVS address space, allowing users to run IBM, CICS-type applications, batch applications and Unix.

MVS/ESA was repackaged as OS/390 as a marketing exercise but it's basically the same thing.

Version: 5.1.

[Features? Dates?]

Last updated: 1999-01-20

multiplexer

multiplexor

multiplexing

<communications>

1. (Or "multiple access") Combining several signals for transmission on some shared medium (e.g. a telephone wire). The signals are combined at the transmitter by a multiplexor (a "mux") and split up at the receiver by a demultiplexor. The communications channel may be shared between the independent signals in one of several different ways: time division multiplexing, frequency division multiplexing, or code division multiplexing.

If the inputs take turns to use the output channel (time division multiplexing) then the output bandwidth need be no greater than the maximum bandwidth of any input.

If many inputs may be active simultaneously then the output bandwidth must be at least as great as the total bandwidth of all simultaneously active inputs. In this case the multiplexor is also known as a concentrator.

Last updated: 1995-03-02

<storage>

2. Writing multiple logical copies of data files. Placing the copies on totally separate paths to mirrored devices greatly reduces the probability of all copies being corrupt. Multiplexing differs from mirroring in that mirroring takes one data file and copies it to many devices, thus making it possible to copy a corrupt file many times. Multiplexing writes the data files to many places simultaneously; there is no "original" data file.

Last updated: 2001-05-10

multiplexor

multiplexing

Multiplexor Channel

(MPX) mainframe terminology for a slow peripheral device connection, e.g. for a printer, operator console, or card reader.

Last updated: 1997-06-30

multiplex printer

<hardware>

A duplex circuit using time-division multiplexing to provide multiple duplex channels over one wire.

For example, channels A, B, C, and D could be used for simultaneous transmission in both directions.

Last updated: 2000-04-02

Nearby terms:

Multi-Pascal ♦ multiple access ♦ Multiple Access with Colision Avoidance

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