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registers

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register [n]
 
1)an official written record of names or events or transactions
    Synonyms :registry 
    See Also: written_account  file  cross-file  cadaster  check_register  studbook  rent-roll 
 
2)(music) the timbre that is characteristic of a certain range and manner of production of the human voice or of different pipe organ stops or of different musical instruments
    Synonyms :
    See Also: quality  music  head_register  chest_register 
 
3)a book in which names and transactions are listed
    Synonyms :
    See Also: record  cross-file  file  accounting  inventory  payroll 
 
4)(computer science) memory device that is the part of computer memory that has a specific address and that is used to hold information of a specific kind
    Synonyms :
    See Also: memory_device  computer_memory  computer_science  accumulator  counter  index_register  shift_register 
 
5)an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room
    Synonyms :
    See Also: air_duct 
 
6)a regulator (as a sliding plate) for regulating the flow of air into a furnace or other heating device
    Synonyms :
    See Also: regulator  furnace 
 
7)a cashbox with an adding machine to register transactions; used in shops to add up the bill
    Synonyms :cash_register 
    See Also: cashbox  adding_machine 
 
register [v]
 
1)record in writing; enter into a book of names or events or transactions
    Synonyms :
    See Also: enter  registration  enrollment  registrant  file  patent  enrol  list  book 
 
2)record in a public office or in a court of law; "file for divorce"; "file a complaint"
    Synonyms :file 
    See Also: jurisprudence  file  data_file  filing 
 
3)enroll to vote; "register for an election"
    Synonyms :
    See Also: enrol 
 
4)be aware of; "Did you register any change when I pressed the button?"
    Synonyms :record 
    See Also: comprehend 
 
5)indicate a certain reading; of gauges and instruments; "The thermometer showed thirteen degrees below zero"; "The gauge read `empty'"
    Synonyms :read record show 
    See Also: indicate  adjustment  indication  meter_reading  say  show  strike 
 
6)have one's name listed as a candidate for several parties
    Synonyms :cross-file 
    See Also: campaign  slate 
 
7)show in one's face; "Her surprise did not register"
    Synonyms :
    See Also: show  record 
 
8)manipulate the registers of an organ
    Synonyms :
    See Also: play  music  registration 
 
9)send by registered mail; "I'd like to register this letter"
    Synonyms :
    See Also: mail 
 
10)enter into someone's consciousness; "Did this event register in your parents' minds?"
    Synonyms :
    See Also: record  affect 
 

From The Free On-line Dictionary of Computing: (http://www.foldoc.org/, Editor Denis Howe)

1. One of a small number of high-speed memory locations in a computer's CPU. Registers differ from ordinary random access memory in several respects:

There are only a small number of registers (the "register set"), typically 32 in a modern processor though some, e.g. SPARC, have as many as 144. A register may be directly addressed with a few bits. In contrast, there are usually millions of words of main memory (RAM), requiring at least twenty bits to specify a memory location. Main memory locations are often specified indirectly, using an indirect addressing mode where the actual memory address is held in a register.

Registers are fast; typically, two registers can be read and a third written -- all in a single cycle. Memory is slower; a single access can require several cycles.

The limited size and high speed of the register set makes it one of the critical resources in most computer architectures. Register allocation, typically one phase of the back-end, controls the use of registers by a compiled program.

See also accumulator, FUBAR, orthogonal, register dancing, register allocation, register spilling.

2. An addressable location in a memory-mapped peripheral device. E.g. the transmit data register in a UART.








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