Universal Asynchronous Receiver Transmitter. An integrated circuit that carries out the function of asynchronous, bi-directional communication between a microprocessor and a serial interface. In MIDI, it is a part of the interface that forms the link between the processor and the MIDI sockets.

UDF Universal Disk Format: for use with optical medium and avoids the problems and confusion that CDROMs had because of the many different file formats used. Permits the use of a DVD by DOS, OS/2, Macintosh, windows, and UNIX operating systems, as well as dedicated players.

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