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byte
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{{short description|Unit of digital information commonly consisting of eight bits}}{{hatnote|This article is about the unit of information. For other uses, see Byte (disambiguation).}}







factoids
{{anchor|4 bit|6 bit|8 bit|9 bit}}The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit of memory in many computer architectures.The size of the byte has historically been hardware dependent and no definitive standards existed that mandated the size. Sizes from 1 to 48 bits have been used. The six-bit character code was an often used implementation in early encoding systems and computers using six-bit and nine-bit bytes were common in the 1960s. These systems often had memory words of 12, 24, 36, 48, or 60 bits, corresponding to 2, 4, 6, 8, or 10 six-bit bytes. In this era, bit groupings in the instruction stream were often referred to as syllables, before the term byte became common.The modern de facto standard of eight bits, as documented in ISO/IEC 2382-1:1993, is a convenient power of two permitting the binary-encoded values 0 through 255 for one byte—2 to the power 8 is 256. The international standard IEC 80000-13 codified this common meaning. Many types of applications use information representable in eight or fewer bits and processor designers optimize for this common usage. The popularity of major commercial computing architectures has aided in the ubiquitous acceptance of the eight-bit size. Modern architectures typically use 32- or 64-bit words, built of four or eight bytes.The unit symbol for the byte was designated as the upper-case letter B by the International Electrotechnical Commission (IEC) and Institute of Electrical and Electronics Engineers (IEEE) in contrast to the bit, whose IEEE symbol is a lower-case b. Internationally, the unit octet, symbol o, explicitly defines a sequence of eight bits, eliminating the ambiguity of the byte.

History

The term byte was coined by Werner Buchholz in June 1956,{{efn|{{anchor|Note-Dates}}Many sources erroneously indicate a birthday of the term byte in July 1956, but Werner Buchholz claimed that the term would have been coined in June 1956. In fact, the earliest document supporting this dates from 1956-06-11. Buchholz stated that the transition to 8-bit bytes was conceived in August 1956, but the earliest document found using this notion dates from September 1956.}} during the early design phase for the IBM Stretch computer, which had addressing to the bit and variable field length (VFL) instructions with a byte size encoded in the instruction.It is a deliberate respelling of bite to avoid accidental mutation to bit.Another origin of byte for bit groups smaller than a computers's word size, and in particular groups of four bits, is on record by Louis G. Dooley, who claimed he coined the term while working with Jules Schwartz and Dick Beeler on an air defense system called SAGE at MIT Lincoln Laboratory in 1956 or 1957, which was jointly developed by Rand, MIT, and IBM. Later on, Schwartz's language JOVIAL actually used the term, but the author recalled vaguely that it was derived from AN/FSQ-31.Early computers used a variety of four-bit binary-coded decimal (BCD) representations and the six-bit codes for printable graphic patterns common in the U.S. Army (FIELDATA) and Navy. These representations included alphanumeric characters and special graphical symbols. These sets were expanded in 1963 to seven bits of coding, called the American Standard Code for Information Interchange (ASCII) as the Federal Information Processing Standard, which replaced the incompatible teleprinter codes in use by different branches of the U.S. government and universities during the 1960s. ASCII included the distinction of upper- and lowercase alphabets and a set of control characters to facilitate the transmission of written language as well as printing device functions, such as page advance and line feed, and the physical or logical control of data flow over the transmission media. During the early 1960s, while also active in ASCII standardization, IBM simultaneously introduced in its product line of System/360 the eight-bit Extended Binary Coded Decimal Interchange Code (EBCDIC), an expansion of their six-bit binary-coded decimal (BCDIC) representations{{efn|There was more than one BCD code page.}} used in earlier card punches.The prominence of the System/360 led to the ubiquitous adoption of the eight-bit storage size, while in detail the EBCDIC and ASCII encoding schemes are different.In the early 1960s, AT&T introduced digital telephony on long-distance trunk lines. These used the eight-bit µ-law encoding. This large investment promised to reduce transmission costs for eight-bit data.The development of eight-bit microprocessors in the 1970s popularized this storage size. Microprocessors such as the Intel 8008, the direct predecessor of the 8080 and the 8086, used in early personal computers, could also perform a small number of operations on the four-bit pairs in a byte, such as the decimal-add-adjust (DAA) instruction. A four-bit quantity is often called a nibble, also nybble, which is conveniently represented by a single hexadecimal digit.The term octet is used to unambiguously specify a size of eight bits. It is used extensively in protocol definitions.Historically, the term octad or octade was used to denote eight bits as well at least in Western Europe; however, this usage is no longer common. The exact origin of the term is unclear, but it can be found in British, Dutch, and German sources of the 1960s and 1970s, and throughout the documentation of Philips mainframe computers.

Unit symbol

{{Bit and byte prefixes}}The unit symbol for the byte is specified in IEC 80000-13, IEEE 1541 and the Metric Interchange Format as the upper-case character B. In contrast, IEEE 1541 specifies the lower case character b as the symbol for the bit, but IEC 80000-13 and Metric-Interchange-Format specify the symbol as bit, providing disambiguation from B for byte.In the International System of Quantities (ISQ), B is the symbol of the bel, a unit of logarithmic power ratios named after Alexander Graham Bell, creating a conflict with the IEC specification. However, little danger of confusion exists, because the bel is a rarely used unit. It is used primarily in its decadic fraction, the decibel (dB), for signal strength and sound pressure level measurements, while a unit for one tenth of a byte, the decibyte, and other fractions, are only used in derived units, such as transmission rates.The lowercase letter o for octet is defined as the symbol for octet in IEC 80000-13 and is commonly used in languages such as French and Romanian, and is also combined with metric prefixes for multiples, for example ko and Mo.The usage of the term octad(e) for eight bits is no longer common.

Unit multiples

(File:Binaryvdecimal.svg|thumb|right|275px|Percentage difference between decimal and binary interpretations of the unit prefixes grows with increasing storage size)Despite standardization efforts, ambiguity still exists in the meanings of the SI (or metric) prefixes used with the unit byte, especially concerning the prefixes kilo (k or K), mega (M), and giga (G). Computer memory has a binary architecture in which multiples are expressed in powers of 2. In some fields of the software and computer hardware industries a binary prefix is used for bytes and bits, while producers of computer storage devices practice adherence to decimal SI multiples. For example, a computer disk drive capacity of 100 gigabytes is specified when the disk contains 100 billion bytes (93 gibibytes) of storage space.While the numerical difference between the decimal and binary interpretations is relatively small for the prefixes kilo and mega, it grows to over 20% for prefix yotta. The linear–log graph illustrates the difference versus storage size up to an exabyte.

Common uses

Many programming languages defined the data type byte.The C and C++ programming languages define byte as an "addressable unit of data storage large enough to hold any member of the basic character set of the execution environment" (clause 3.6 of the C standard). The C standard requires that the integral data type unsigned char must hold at least 256 different values, and is represented by at least eight bits (clause 5.2.4.2.1). Various implementations of C and C++ reserve 8, 9, 16, 32, or 36 bits for the storage of a byte.{{efn|The actual number of bits in a particular implementation is documented as CHAR_BIT as implemented in the file limits.h.}} In addition, the C and C++ standards require that there are no "gaps" between two bytes. This means every bit in memory is part of a byte.Java's primitive byte data type is always defined as consisting of 8 bits and being a signed data type, holding values from −128 to 127..NET programming languages, such as C#, define both an unsigned byte and a signed sbyte, holding values from 0 to 255, and −128 to 127, respectively.In data transmission systems, the byte is defined as a contiguous sequence of bits in a serial data stream representing the smallest distinguished unit of data. A transmission unit might include start bits, stop bits, or parity bits, and thus could vary from 7 to 12 bits to contain a single 7-bit ASCII code.

See also

Notes

{{notelist}}

References

{{reflist|refs={{anchor|Buchholz-1956-1}}BOOK, The Link System, 7. The Shift Matrix, Werner, Buchholz, Werner Buchholz, 1956-06-11, IBM Stretch, Stretch Memo No. 39G, IBM, 5–6,weblink 2016-04-04, dead,weblink" title="web.archive.org/web/20170404152534weblink">weblink 2017-04-04, […] Most important, from the point of view of editing, will be the ability to handle any characters or digits, from 1 to 6 bits long.Figure 2 shows the Shift Matrix to be used to convert a 60-bit word (computer architecture), word, coming from Memory in parallel, into character (computing), characters, or 'bytes' as we have called them, to be sent to the serial adder, Adder serially. The 60 bits are dumped into magnetic cores on six different levels. Thus, if a 1 comes out of position 9, it appears in all six cores underneath. Pulsing any diagonal line will send the six bits stored along that line to the Adder. The Adder may accept all or only some of the bits.Assume that it is desired to operate on 4 bit decimal digits, starting at the right. The 0-diagonal is pulsed first, sending out the six bits 0 to 5, of which the Adder accepts only the first four (0–3). Bits 4 and 5 are ignored. Next, the 4 diagonal is pulsed. This sends out bits 4 to 9, of which the last two are again ignored, and so on.It is just as easy to use all six bits in alphanumeric work, or to handle bytes of only one bit for logical analysis, or to offset the bytes by any number of bits. All this can be done by pulling the appropriate shift diagonals. An analogous matrix arrangement is used to change from serial to parallel operation at the output of the adder. […], BOOK, Memory Word Length, 5. Input-Output, Werner, Buchholz, Werner Buchholz, 1956-07-31, IBM Stretch, Stretch Memo No. 40, IBM, 2,weblink 2016-04-04, dead,weblink" title="web.archive.org/web/20170404160423weblink">weblink 2017-04-04, […] 60 is a multiple of 1, 2, 3, 4, 5, and 6. Hence bytes of length from 1 to 6 bits can be packed efficiently into a 60-bit word (computer architecture), word without having to split a byte between one word and the next. If longer bytes were needed, 60 bits would, of course, no longer be ideal. With present applications, 1, 4, and 6 bits are the really important cases.With 64-bit words, it would often be necessary to make some compromises, such as leaving 4 bits unused in a word when dealing with 6-bit bytes at the input and output. However, the LINK Computer can be equipped to edit out these gaps and to permit handling of bytes which are split between words. […], {{anchor|Buchholz-1956-3}}BOOK, Memory Word Length and Indexing, 2. Input-Output Byte Size, Werner, Buchholz, Werner Buchholz, 1956-09-19, IBM Stretch, Stretch Memo No. 45, IBM, 1,weblink 2016-04-04, dead,weblink" title="web.archive.org/web/20170404161611weblink">weblink 2017-04-04, […] The maximum input-output byte size for serial operation will now be 8 bits, not counting any error detection and correction bits. Thus, the Exchange will operate on an 8-bit byte basis, and any input-output units with less than 8 bits per byte will leave the remaining bits blank. The resultant gaps can be edited out later by programming […], {{anchor|Buchholz-1962}}PLANNING A COMPUTER SYSTEM – PROJECT STRETCH, Gerrit Anne, Blaauw, Gerrit Anne Blaauw, Frederick Phillips, Brooks, Jr., Frederick Phillips Brooks, Jr., Werner, Buchholz, Werner Buchholz, Werner, Buchholz, Werner Buchholz, McGraw-Hill Book Company, Inc. / The Maple Press Company, York, PA., 61-10466, 1962, 4: Natural Data Units, PDF, 39–40,weblink 2017-04-03, dead,weblink" title="web.archive.org/web/20170403014651weblink">weblink 2017-04-03, Terms used here to describe the structure imposed by the machine design, in addition to bit, are listed below.Byte denotes a group of bits used to encode a character, or the number of bits transmitted in parallel to and from input-output units. A term other than character (computing), character is used here because a given character may be represented in different applications by more than one code, and different codes may use different numbers of bits (i.e., different byte sizes). In input-output transmission the grouping of bits may be completely arbitrary and have no relation to actual characters. (The term is coined from bite, but respelled to avoid accidental mutation to bit.)A Word (unit), word consists of the number of data bits transmitted in parallel from or to memory in one memory cycle. Word size is thus defined as a structural property of the memory. (The term catena (unit), catena was coined for this purpose by the designers of the Groupe Bull, Bull {{ill, Bull Gamma 60{{!, GAMMA 60|fr|Gamma 60}} computer.)Block refers to the number of words transmitted to or from an input-output unit in response to a single input-output instruction. Block size is a structural property of an input-output unit; it may have been fixed by the design or left to be varied by the program. }}ROBERT WILLIAM, Bemer, Robert William Bemer, A proposal for a generalized card code of 256 characters, Communications of the ACM, 2, 9, 19–23, 1959, 10.1145/368424.368435, WEB, Computer History Museum – Exhibits – Internet History – 1964: Internet History 1962 to 1992, Computer History Museum, 2017, 2015,weblink 2017-04-03, live,weblink" title="web.archive.org/web/20170403115211weblink">weblink 2017-04-03, WEB, Metric-Interchange-Format, Aubrey, Jaffer, Aubrey Jaffer, 2011, 2008,weblink 2017-04-03, live,weblink 2017-04-03, WEB, The TCP/IP Guide – Binary Information and Representation: Bits, Bytes, Nibbles, Octets and Characters – Byte versus Octet, 3.0, 2005-09-20, 2001, Charles M., Kozierok,weblink 2017-04-03, live,weblink" title="web.archive.org/web/20170403122042weblink">weblink 2017-04-03, WEB, Timeline of the IBM Stretch/Harvest era (1956–1961), Computer History Museum, June 1956,weblink 2017-04-03, dead,weblink" title="web.archive.org/web/20160429212717weblink">weblink 2016-04-29, 1956 Summer: Gerrit Blaauw, Fred Brooks, Werner Buchholz, John Cocke and Jim Pomerene join the IBM Stretch, Stretch team. Lloyd Hunter provides transistor leadership.{{sic, 1956 July, 1956 June, : In a report Werner Buchholz lists the advantages of a 64-bit word length for Stretch. It also supports NSA's requirement for 8-bit bytes. Werner's term "Byte" first popularized in this memo. }} (NB. This timeline erroneously specifies the birth date of the term "byte" as July 1956, while Buchholz actually used the term as early as June 1956.)WEB, byte definition, Eric Steven, Raymond, Eric Steven Raymond, 2017, 2003,weblink 2017-04-03, live,weblink" title="web.archive.org/web/20170403120304weblink">weblink 2017-04-03, {{anchor|Blaauw-1959}}JOURNAL, Processing Data in Bits and Pieces, Gerrit Anne, Blaauw, Gerrit Anne Blaauw, Frederick Phillips, Brooks, Jr., Frederick Phillips Brooks, Jr., Werner, Buchholz, Werner Buchholz, IRE Transactions on Electronic Computers, June 1959, 121, {{anchor|Buchholz-1977}}JOURNAL, Buchholz, Werner, Werner Buchholz, The Word 'Byte' Comes of Age..., Byte Magazine, February 1977, 2, 2, 144,weblink […] The first reference found in the files was contained in an internal memo written in June 1956 during the early days of developing IBM Stretch, Stretch. A byte was described as consisting of any number of parallel bits from one to six. Thus a byte was assumed to have a length appropriate for the occasion. Its first use was in the context of the input-output equipment of the 1950s, which handled six bits at a time. The possibility of going to 8 bit bytes was considered in #Note-Dates, August 1956 and incorporated in the design of Stretch #Buchholz-1956-3, shortly thereafter. The first published reference to the term occurred in 1959 in a paper '#Blaauw-1959, Processing Data in Bits and Pieces' by Gerrit Anne Blaauw, G A Blaauw, Frederick Phillips Brooks, Jr., F P Brooks Jr and Werner Buchholz, W Buchholz in the IRE Transactions on Electronic Computers, June 1959, page 121. The notions of that paper were elaborated in Chapter 4 of #Buchholz-1962, Planning a Computer System (Project Stretch), edited by W Buchholz, McGraw-Hill Book Company (1962). The rationale for coining the term was explained there on page 40 as follows:Byte denotes a group of bits used to encode a character, or the number of bits transmitted in parallel to and from input-output units. A term other than character is used here because a given character may be represented in different applications by more than one code, and different codes may use different numbers of bits (ie, different byte sizes). In input-output transmission the grouping of bits may be completely arbitrary and have no relation to actual characters. (The term is coined from bite, but respelled to avoid accidental mutation to bit.)System/360 took over many of the Stretch concepts, including the basic byte and word sizes, which are powers of 2. For economy, however, the byte size was fixed at the 8 bit maximum, and addressing at the bit level was replaced by byte addressing. […], WEB, Why is a byte 8 bits? Or is it?, Robert William, Bemer, Robert William Bemer, 2000-08-08, Computer History Vignettes,weblink 2017-04-03, dead,weblink" title="web.archive.org/web/20170403130829weblink">weblink 2017-04-03, […] I came to work for IBM, and saw all the confusion caused by the 64-character limitation. Especially when we started to think about word processing, which would require both upper and lower case. […] I even made a proposal (in view of IBM Stretch, STRETCH, the very first computer I know of with an 8-bit byte) that would extend the number of punch card character codes to 256 […]. So some folks started thinking about 7-bit characters, but this was ridiculous. With IBM's STRETCH computer as background, handling 64-character words divisible into groups of 8 (I designed the character set for it, under the guidance of Dr. Werner Buchholz, the man who DID coin the term 'byte' for an 8-bit grouping). […] It seemed reasonable to make a universal 8-bit character set, handling up to 256. In those days my mantra was 'powers of 2 are magic'. And so the group I headed developed and justified such a proposal […] The IBM System 360, IBM 360 used 8-bit characters, although not ASCII directly. Thus Buchholz's 'byte' caught on everywhere. I myself did not like the name for many reasons. The design had 8 bits moving around in parallel. But then came a new IBM part, with 9 bits for self-checking, both inside the CPU and in the tape drives. I exposed this 9-bit byte to the press in 1973. But long before that, when I headed software operations for Cie. Bull in France in 1965–66, I insisted that 'byte' be deprecated in favor of 'octet (computing), octet'. […] It is justified by new communications methods that can carry 16, 32, 64, and even 128 bits in parallel. But some foolish people now refer to a '16-bit byte' because of this parallel transfer, which is visible in the UNICODE set. I'm not sure, but maybe this should be called a 'hextet'. […], WEB, IBM confirms the use of EBCDIC in their mainframes as a default practice, 2008, IBM,weblink 2008-06-16, {{dead link |date=November 2016 |bot=InternetArchiveBot |fix-attempted=yes}}WEB,weblink When is a kilobyte a kibibyte? And an MB an MiB?, The International System of Units and the IEC, International Electrotechnical Commission, 2010-08-30, )WEB, British Commercial Computer Digest: Pergamon Computer Data Series, R. H., Williams, Pergamon Press, 1969-01-01, 1483122107, 978-1483122106,weblink 2015-08-03, WEB, Philips – Philips Data Systems' product range – April 1971, Philips, April 1971,weblink 2015-08-03, dead,weblink" title="web.archive.org/web/20160304072023weblink">weblink 2016-03-04, WEB, Marshall, Cline,weblink I could imagine a machine with 9-bit bytes. But surely not 16-bit bytes or 32-bit bytes, right?, {{Citation |author-last=Klein |author-first=Jack |year=2008 |title=Integer Types in C and C++ |url=http://home.att.net/~jackklein/c/inttypes.html#char |archive-url=https://web.archive.org/web/20100327225121weblink |archive-date=2010-03-27 |access-date=2015-06-18}}WEB, Marshall, Cline,weblink C++ FAQ: the rules about bytes, chars, and characters, WEB, Northwestern University,weblink External Interfaces/API, BOOK, 3600 Computer System – Reference Manual, 1966-10-11, 1965, K, Control Data Corporation (CDC), St. Paul, Minnesota, USA, 60021300,weblink 2017-04-05, dead,weblink" title="web.archive.org/web/20170405154001weblink">weblink 2017-04-05, Byte – A partition of a computer word., (NB. Discusses 12-bit, 24-bit and 48-bit bytes.)JOURNAL, Byte: The Word, Louis G., Dooley, February 1995, BYTE, Ocala, FL, USA,weblink dead,weblink" title="web.archive.org/web/19961220122258weblink">weblink 1996-12-20, […] The word byte was coined around 1956 to 1957 at MIT Lincoln Laboratory, MIT Lincoln Laboratories within a project called Experimental SAGE Subsector, SAGE (the North American Air Defense System), which was jointly developed by Rand Corporation, Rand, Lincoln Labs, and IBM. In that era, computer memory structure was already defined in terms of word size (computing), word size. A word consisted of x number of bits; a bit represented a binary notational position in a word. Operations typically operated on all the bits in the full word.We coined the word byte to refer to a logical set of bits less than a full word size. At that time, it was not defined specifically as x bits but typically referred to as a set of Nibble (computing), 4 bits, as that was the size of most of our coded data items. Shortly afterward, I went on to other responsibilities that removed me from SAGE. After having spent many years in Asia, I returned to the U.S. and was bemused to find out that the word byte was being used in the new microcomputer technology to refer to the basic addressable memory unit., (NB. According to his son, Dooley wrote to him: "On good days, we would have the XD-1 up and running and all the programs doing the right thing, and we then had some time to just sit and talk idly, as we waited for the computer to finish doing its thing. On one such occasion, I coined the word "byte", they (Jules Schwartz and Dick Beeler) liked it, and we began using it amongst ourselves. The origin of the word was a need for referencing only a part of the word length of the computer, but a part larger than just one bit...Many programs had to access just a specific 4-bit segment of the full word...I wanted a name for this smaller segment of the fuller word. The word "bit" lead to "bite" (meaningfully less than the whole), but for a unique spelling, "i" could be "y", and thus the word "byte" was born.")ORIGIN OF THE TERM "BYTE", 1956,weblink 2017-04-10, live,weblink" title="web.archive.org/web/20170410125522weblink">weblink 2017-04-10, A question-and-answer session at an ACM conference on the history of programming languages included this exchange:John Goodenough, JOHN GOODENOUGH: You mentioned that the term "byte" is used in JOVIAL. Where did the term come from?Jules Schwartz, JULES SCHWARTZ (inventor of JOVIAL): As I recall, the AN/FSQ-31, a totally different computer than the IBM 709, 709, was byte oriented. I don't recall for sure, but I'm reasonably certain the description of that computer included the word "byte," and we used it.Fred Brooks, FRED BROOKS: May I speak to that? Werner Buchholz coined the word as part of the definition of IBM STRETCH, STRETCH, and the AN/FSQ-31 picked it up from STRETCH, but Werner is very definitely the author of that word.SCHWARTZ: That's right. Thank you., WEB, Stefan, Ram, Erklärung des Wortes "Byte" im Rahmen der Lehre binärer Codes, German, Freie Universität Berlin, Berlin, Germany,weblink 2017-04-10, BOOK, ISO/IEC 2382-1: 1993, Information technology – Vocabulary – Part 1: Fundamental terms, 1993, byteA string that consists of a number of bits, treated as a unit, and usually representing a character or a part of a character.NOTES1 The number of bits in a byte is fixed for a given data processing system.2 The number of bits in a byte is usually 8., BOOK, ISO 2382-4, Organization of data, 2, byte, octet, 8-bit byte: A string that consists of eight bits., BOOK, Error-Control Coding for Computer Systems, Thammavaram R. N., Rao, Eiji, Fujiwara, Edward J., McCluskey, Prentice Hall Series in Computer Engineering, 1989, 88-17892, 1, 0-13-283953-9, Prentice Hall, Englewood Cliffs, NJ, USA, (NB. Example of the usage of a code for "4-bit bytes".)BOOK, Einführung in die digitale Datenverarbeitung, German, Introduction to digital information processing, Hans Jörg, Tafel, Carl Hanser Verlag, 1971, RWTH, Aachen, Germany, Munich, Germany, 3-446-10569-7, 300, Byte = zusammengehörige Folge von i.a. neun Bits; davon sind acht Datenbits, das neunte ein Prüfbit, (NB. Defines a byte as a group of typically 9 bits; 8 data bits plus 1 parity bit.)}}

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