T

TA              Terminal Adapter.
TAB             TABulation character.
Tandem/16       A fault-tolerant computer (circa 1976) by Tandem Computers.
TAPI            Telephone Application Programming Interface.
Tcl             Tool Command Language.
TCM             Thermal Conduction Module.
TCM             Trellis Coded Modulation.
TCP             Transmission Control Protocol. A higher level (session layer)
                of the TCP/IP protocol suite.  See also IP, TCP/IP.
TCP/IP          The protocol suite originally developed by DARPA for use on
                its ARPAnet network, which is now known as the Internet.
                See also IP, TCP.
TCU             Trunk Coupling Unit. See MIC.
TDB             Task DataBase.
TDM             Time-Division Multiplexed pin. A connection on an integrated
                circuit chip that supports different purposes at different
                times (e.g. a pin that delivers an address during one part
                of a bus cycle and data during another part of the bus
                cycle).
TDMA            Time-Division Multiple-Access.
TDMS            Time-shared Data Management System. The TDMS of System
                Development Corporation (now Burroughs) and the RFMS
                developed at the University of Texas at Austin are precursors
                of another major commercial hierarchical system called System
                2000, which is now marketed by SAS Inc. Hardgrave describes a
                language, BOLT, for the hierarchical model.
TE              Transport Entity.
TED             Triteal's Enterprise Desktop.
TEQ             Total Engagement Quality.
TF              Trap Flag. A processor status flag in the 8088 microprocessor
                (and others) that, if set, initiates an interrupt after each
                instruction. Used for diagnostic tests and debugging.
TFT             Thin-Film Transistor.
TFTP            Trivial File Transfer Protocol.
TI ASC          Texas Instruments Advanced Scientific Computer; an early
                supercomputer (circa 1970) that was a memory-to-memory vector
                processor by Texas Instruments Corporation.
TIS             Trusted Information System.
TIU		Trusted Interface Uint.
TL              See TTL.
TLB             Translation-Lookaside Buffer. A cache in the CPU of many
                virtual-memory computers that holds the most recent
                associations between logical and physical addresses; part of
                the memory-mapping hardware.
TLI             UNIX System V Transport Layer.
TLU             Table LookUp.
TM              Tape Mark.
TMC             Thinking Machine Coorporation.
TODOS           TOols for Designing Office Systems.
TOP             Technical Office Protocol.
TOS             Tape Operating System.
TP              Transaction Processing.
TP_4            Transport Protocol class 4.
TPE             Twisted Pair Ethernet. aka: 10Base-T.
TPI             clock Ticks Per Instruction. For a given computer, the
                average number of clock cycles between consecutive
                instruction issues.
TPS             Transactions Per Second. A measurement of the number of
                transactions a computer can execute in 1 second.
TQFP		Thin Quad Flat Pack. Chip package type - up to 208 pins.
TRAC            Texas Reconfigurable Array Computer. The TRAC research 
                project at the University of Texas uses a circuit-switched 
                banyan network to achieve a parallel computer whose resources 
                can be dynamically reconfigured to fit the structure of 
                problems.
TRM             Temporal Relation Model. In this model, attributes are
                divided into time-varying and non-time-varying onces, and so
                are relations.
TRS-80          Tandy Radio-Shack-80. The first personal computer from Radio
                Shack; released in 1977, it used a Zilog Z80 microprocessor.
TSAP            Transport Service Access Point.
TSAPI           Telephone Services Application Program[ming] Interface.
TSE             Terminal Switching Exchange.
TSO             Time Sharing Option. TSO is a longstanding time-sharing
                environment product of IBM. See also IMS.
TSQL            Temporal Structured Query Language.
TSR             Terminate and Stay Resident. A program which remains in
                memory after terminating in order to provide services to
                other programs or the user.  The name comes from the name of
                the DOS function call used to remain in memory after
                termination.
TTL             Transistor-Transistor Logic. A common technology for
                switching circuits in which true is represented by a voltage
                level of 2.5 to 5 volts and false by a level of 0 to 0.7
                volts.
TTS             Transaction Tracking System. The TTS capability of NetWare
                protects critical files against file server or hard disk
                failures.
TTY             TeleTYpewriter.
TULIP		DEC 21040 "Tulip" chip.
TULIP		Name of a IBM PC-comp. computer brand. 
TWAIN		Toolkit Without An Important Name.


U

UART            Universal Asynchronous Receiver-Transmitter. An I/O device
                that sends and receives information in bit-serial fashion.
UCW             Unit Control Word.
UDP             User Datagram Protocol. A connectionless (best-try) transport 
                layer protocol in the TCP/IP suite.
UE              User Element.
UJT             UniJunction Transistor.
UMA             Uniform Memory Access.
UMB             Upper Memory Block. A noncontiguous section of allocable
                memory located between the 640K and 1024K addresses.
UMC             United Microelectronics Corporation.
UNC             Universal Naming Convention. The standard way of describing
                network servers and their directories under MS-DOS and
                Windows NT.  A name in UNC format consists of two backslashes
                followed by the server name, optionally followed by another
                backslash and a list of backslash-separated fields; for
                example \\SERVER1\SHARED-DIR\SUBDIR1\SUBDIR2\FILENAME.EXT.
UNC             University of North Carolina.
UNIVAC          UNIVersal Automatic Computer. The first commercially
                successful computer; introduced by Remington Rand in 1951.
UNIX            An operating system that AT&T Bell Laboratories introduced in
                the early 1970s and is now a favorite operating system for a
                wide variety of systems.
UPS             Uninterruptable Power Supply.
URI             Universal Resource Identifier.
URL             Uniform Resource Locator.
USART		Universal Synchronous/Asynchronous Receiver/Transmitter.
USB             Universal Serial Bus.
USER            User Systems Ergonomics Research.
USRT            Universal Synchronous Receiver Transmitter.
UTP             Unshielded Twisted Pair.
UUID            Universally Unique IDentifier.
UWA             User Work Area. The UWA is a set of program variables,
                declared in the host program, to communicate the contents
                of individual records between the DBMS and the host program.
