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130-484: The term radioteletype is used to describe both the original radioteletype system, sometimes described as " Baudot ", as well as the entire family of systems connecting two or more teleprinters or PCs using software to emulate teleprinters, over radio, regardless of alphabet, link system or modulation. In some applications, notably military and government, radioteletype is known by the acronym RATT (Radio Automatic Teletype). Landline teleprinter operations began in 1849 when

260-731: A is not written, as in the Indic abugidas, The source of the term "abugida", namely the Ge'ez abugida now used for Amharic and Tigrinya , has assimilated into their consonant modifications. It is no longer systematic and must be learned as a syllabary rather than as a segmental script. Even more extreme, the Pahlavi abjad eventually became logographic . Thus the primary categorisation of alphabets reflects how they treat vowels. For tonal languages , further classification can be based on their treatment of tone. Though names do not yet exist to distinguish

390-496: A stop bit (a logical 1 or mark, lasting 1, 1.5 or 2 bits). When a sequence of start bit, 5 data bits and stop bit arrives at the input of the teleprinter, it is converted to a 5-bit word and passed to the printer or VDU. With electromechanical teleprinters, these functions required complicated electromechanical devices, but they are easily implemented with standard digital electronics using shift registers . Special integrated circuits have been developed for this function, for example

520-485: A Null in the middle of a message (immediately followed by an Erasure/Delete/LS control if followed by a letter, or by a FS control if followed by a figure). Sending Null controls also did not cause the paper band to advance to the next row (as nothing was punched), so this saved precious lengths of punchable paper band. On the other hand, the Erasure/Delete/LS control code was always punched and always shifted to

650-425: A circuit was put in service between Philadelphia and New York City. Émile Baudot designed a system using a five unit code in 1874 that is still in use today. Teleprinter system design was gradually improved until, at the beginning of World War II, it represented the principal distribution method used by the news services. Radioteletype evolved from these earlier landline teleprinter operations. The US Department of

780-433: A communications radio receiver equipped with a BFO, and have a distinctive "beedle-eeeedle-eedle-eee" sound, usually starting and ending on one of the two tones ("idle on mark"). The transmission speed is a characteristic of the teleprinter while the shift (the difference between the tones representing mark and space) is a characteristic of the modem. These two parameters are therefore independent, provided they have satisfied

910-416: A consistent one-to-one correspondence between the letters and the phonemes so that a writer could predict the spelling of a word given its pronunciation, and a speaker would always know the pronunciation of a word given its spelling, and vice versa. However, this ideal is usually never achieved in practice. Languages can come close to it, such as Spanish and Finnish . Others, such as English, deviate from it to

1040-474: A consonant, with diacritics for disambiguation. In the Pollard script , an abugida, vowels are indicated by diacritics. The placing of the diacritic relative to the consonant is modified to indicate the tone. More rarely, a script may have separate letters for tones, as is the case for Hmong and Zhuang . For many, regardless of whether letters or diacritics get used, the most common tone is not marked, just as

1170-561: A different band for added points, but the section multiplier did not increase when the same section was reworked on a different band. Each DXCC entity was counted as an additional ARRL section for RTTY multiplier credit. A new magazine named RTTY , later renamed RTTY Journal , also published the first listing of stations, mostly located in the continental US, that were interested in RTTY in 1956. Amateur radio operators used this callbook information to contact other operators both inside and outside

1300-510: A fragment of text have been replaced by an arbitrary number of LS codes, what follows is still preserved and decodable. It can also be used as an initiator to make sure that the decoding of the first code will not give a digit or another symbol from the figures page (because the Null code can be arbitrarily inserted near the end or beginning of a punch band, and has to be ignored, whereas the Space code

1430-445: A keyboard, which is the main means of entering text, and a printer or visual display unit (VDU). An alternative input device is a perforated tape reader and, more recently, computer storage media (such as floppy disks). Alternative output devices are tape perforators and computer storage media. The line output of a teleprinter can be at either digital logic levels (+5 V signifies a logical "1" or mark and 0 V signifies

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1560-411: A large number of loanwords at different times, retaining their original spelling at varying levels. However, even English has general, albeit complex, rules that predict pronunciation from spelling. Rules like this are usually successful. However, rules to predict spelling from pronunciation have a higher failure rate. Sometimes, countries have the written language undergo a spelling reform to realign

1690-480: A letter for /ti/ . Devanagari is typically an abugida augmented with dedicated letters for initial vowels, though some traditions use अ as a zero consonant as the graphic base for such vowels. The boundaries between the three types of segmental scripts are not always clear-cut. For example, Sorani Kurdish is written in the Arabic script , which, when used for other languages, is an abjad. In Kurdish , writing

1820-413: A logical "0" or space ) or line levels (−80 V signifies a "1" and +80 V a "0"). When no traffic is passed, the line idles at the "mark" state. When a key of the teleprinter keyboard is pressed, a 5-bit character is generated. The teleprinter converts it to serial format and transmits a sequence of a start bit (a logical 0 or space), then one after the other the 5 data bits, finishing with

1950-442: A manual keyboard, and no teleprinter equipment was ever constructed that used it in its original form. The code was entered on a keyboard which had just five piano-type keys and was operated using two fingers of the left hand and three fingers of the right hand. Once the keys had been pressed, they were locked down until mechanical contacts in a distributor unit passed over the sector connected to that particular keyboard, at which time

2080-532: A message it was first necessary to calibrate the impulse rate, a sequence of regularly timed "mark" pulses (1), by a group of five pulses, which could also be detected by simple passive electronic devices to turn on the teleprinter. This sequence of pulses generated a series of Erasure/Delete characters while also initializing the state of the receiver to the Letters shift mode. However, the first pulse could be lost, so this power on procedure could then be terminated by

2210-451: A much larger degree. The pronunciation of a language often evolves independently of its writing system. Writing systems have been borrowed for languages the orthography was not initially made to use. The degree to which letters of an alphabet correspond to phonemes of a language varies. Languages may fail to achieve a one-to-one correspondence between letters and sounds in any of several ways: National languages sometimes elect to address

2340-700: A new BEL code rang a bell or otherwise produced an audible signal at the receiver. Additionally, the WRU or "Who aRe yoU?" code was introduced, which caused a receiving machine to send an identification stream back to the sender. In 1932, the CCITT introduced the International Telegraph Alphabet No. 2 ( ITA2 ) code as an international standard, which was based on the Western Union code with some minor changes. The US standardized on

2470-420: A paper tape (much like DEL in 7-bit ASCII ). The sequence RYRYRY... is often used in test messages, and at the start of every transmission. Since R is 01010 and Y is 10101, the sequence exercises much of a teleprinter's mechanical components at maximum stress. Also, at one time, fine-tuning of the receiver was done using two coloured lights (one for each tone). 'RYRYRY...' produced 0101010101..., which made

2600-460: A phenomenon where letters have been given names distinct from their pronunciations. Systems with acrophony include Greek, Arabic , Hebrew , and Syriac ; systems without include the Latin alphabet . More recently however, four cylinder seals dating to 2400 BC and found at the site of Umm el-Marra , in present-day Syria , are incised with what is potentially the earliest known alphabetic writings in

2730-432: A reperforator would make a perforated copy of the message. Because there was no longer a connection between the operator's hand movement and the bits transmitted, there was no concern about arranging the code to minimize operator fatigue. Instead, Murray designed the code to minimize wear on the machinery by assigning the code combinations with the fewest punched holes to the most frequently used characters . For example,

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2860-409: A set of some 24 hieroglyphs that are called uniliterals, which are glyphs that provide one sound. These glyphs were used as pronunciation guides for logograms , to write grammatical inflections, and, later, to transcribe loan words and foreign names. The script was used a fair amount in the 4th century CE. However, after pagan temples were closed down, it was forgotten in the 5th century until

2990-540: A single LS) to return to lowercase mode. The cell marked as "Reserved" is also usable (using the FS code from the figures shift page) to switch the page of figures (which normally contains digits and national lowercase letters or symbols) to a fourth page (where national letters are uppercase and other symbols may be encoded). ITA2 is still used in telecommunications devices for the deaf (TDD), Telex , and some amateur radio applications, such as radioteletype ("RTTY"). ITA2

3120-451: A single Null immediately followed by an Erasure/Delete character. To preserve the synchronization between devices, the Null code could not be used arbitrarily in the middle of messages (this was an improvement to the initial Baudot system where spaces were not explicitly differentiated, so it was difficult to maintain the pulse counters for repeating spaces on teleprinters). But it was then possible to resynchronize devices at any time by sending

3250-459: A six-bit code to a five-bit code, as suggested by Carl Friedrich Gauss and Wilhelm Weber in 1834, with equal on and off intervals, which allowed for transmission of the Roman alphabet, and included punctuation and control signals. The code itself was not patented (only the machine) because French patent law does not allow concepts to be patented. Baudot's 5-bit code was adapted to be sent from

3380-626: A spoken language. Specifically, letters largely correspond to phonemes as the smallest sound segments that can distinguish one word from another in a given language. Not all writing systems represent language in this way: a syllabary assigns symbols to spoken syllables , while logographies assign symbols to words , morphemes , or other semantic units. The first letters were invented in Ancient Egypt to serve as an aid in writing Egyptian hieroglyphs ; these are referred to as Egyptian uniliteral signs by lexicographers . This system

3510-451: A steady, high rate, without typing errors. A tape could be reused, and in some cases - especially for use with ASCII on NC Machines - might be made of plastic or even very thin metal material in order to be reused many times. The most common test signal is a series of " RYRYRY " characters, as these form an alternating tone pattern exercising all bits and are easily recognized. Pangrams are also transmitted on RTTY circuits as test messages,

3640-453: A syllabary, as their name would imply, because each glyph stands for a consonant and is modified by rotation to represent the following vowel. In a true syllabary, each consonant-vowel combination gets represented by a separate glyph. All three types may be augmented with syllabic glyphs. Ugaritic , for example, is essentially an abjad but has syllabic letters for /ʔa, ʔi, ʔu/ These are the only times that vowels are indicated. Coptic has

3770-792: A systematic graphic modification of the consonants. The earliest known alphabet using this sense is the Wadi el-Hol script , believed to be an abjad. Its successor, Phoenician , is the ancestor of modern alphabets, including Arabic , Greek , Latin (via the Old Italic alphabet ), Cyrillic (via the Greek alphabet), and Hebrew (via Aramaic ). Examples of present-day abjads are the Arabic and Hebrew scripts ; true alphabets include Latin , Cyrillic, and Korean hangul; and abugidas, used to write Tigrinya , Amharic , Hindi , and Thai . The Canadian Aboriginal syllabics are also an abugida, rather than

3900-612: A unique order based on phonology : The letters are arranged according to how and where the sounds get produced in the mouth. This organization is present in Southeast Asia, Tibet, Korean hangul , and even Japanese kana , which is not an alphabet. In Phoenician, each letter got associated with a word that begins with that sound. This is called acrophony and is continuously used to varying degrees in Samaritan , Aramaic , Syriac , Hebrew , Greek , and Arabic . Acrophony

4030-617: A version of ITA2 called the American Teletypewriter code (US TTY) which was the basis for 5-bit teletypewriter codes until the debut of 7-bit ASCII in 1963. Some code points (marked blue in the table) were reserved for national-specific usage. The code position assigned to Null was in fact used only for the idle state of teleprinters. During long periods of idle time, the impulse rate was not synchronized between both devices (which could even be powered off or not permanently interconnected on commuted phone lines). To start

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4160-469: Is Elder Futhark , believed to have evolved out of one of the Old Italic alphabets . Elder Futhark gave rise to other alphabets known collectively as the Runic alphabets . The Runic alphabets were used for Germanic languages from 100 CE to the late Middle Ages, being engraved on stone and jewelry, although inscriptions found on bone and wood occasionally appear. These alphabets have since been replaced with

4290-602: Is also used in Enhanced Broadcast Solution, an early 21st-century financial protocol specified by Deutsche Börse , to reduce the character encoding footprint. Nearly all 20th-century teleprinter equipment used Western Union's code, ITA2, or variants thereof. Radio amateurs casually call ITA2 and variants "Baudot" incorrectly, and even the American Radio Relay League 's Amateur Radio Handbook does so, though in more recent editions

4420-547: Is an early character encoding for telegraphy invented by Émile Baudot in the 1870s. It was the predecessor to the International Telegraph Alphabet No. 2 (ITA2), the most common teleprinter code in use before ASCII . Each character in the alphabet is represented by a series of five bits , sent over a communication channel such as a telegraph wire or a radio signal by asynchronous serial communication . The symbol rate measurement

4550-519: Is an inscription on the sarcophagus of King Ahiram c.  1000 BCE . This script is the parent script of all western alphabets. By the 10th century BCE, two other forms distinguish themselves, Canaanite and Aramaic . The Aramaic gave rise to the Hebrew alphabet . The South Arabian alphabet , a sister script to the Phoenician alphabet, is the script from which the Ge'ez abugida

4680-570: Is believed to have been created by Saints Cyril and Methodius , while the Cyrillic alphabet was created by Clement of Ohrid , their disciple. They feature many letters that appear to have been borrowed from or influenced by Greek and Hebrew. Many phonetic scripts exist in Asia. The Arabic alphabet , Hebrew alphabet , Syriac alphabet , and other abjads of the Middle East are developments of

4810-546: Is considered a separate letter, but accented vowels such as á and é are not. The ll and ch were also formerly considered single letters and sorted separately after l and c , but in 1994, the tenth congress of the Association of Spanish Language Academies changed the collating order so that ll came to be sorted between lk and lm in the dictionary and ch came to be sorted between cg and ci ; those digraphs were still formally designated as letters, but in 2010

4940-511: Is known as baud , and is derived from the same name. In the below table, Columns I, II, III, IV, and V show the code; the Let. and Fig. columns show the letters and numbers for the Continental and UK versions; and the sort keys present the table in the order: alphabetical, Gray and UK Baudot developed his first multiplexed telegraph in 1872 and patented it in 1874. In 1876, he changed from

5070-1104: Is moderately resistant to vagaries of HF propagation and interference, however modern digital modes, such as MFSK , use Forward Error Correction to provide much better data reliability. Principally, the primary users are those who need robust shortwave communications. Examples are: One regular service transmitting RTTY meteorological information is the German Meteorological Service (Deutscher Wetterdienst or DWD). The DWD regularly transmit two programs on various frequencies on LF and HF in standard RTTY (ITA-2 alphabet). The list of callsigns, frequencies, baud rates and shifts are as follows: The DWD signals can be easily received in Europe, North Africa and parts of North America. RTTY (in English) may be spoken as "radioteletype", by its letters: R-T-T-Y, or simply as /ˈɹɪti/ or /ˈɹəti/ Baudot code The Baudot code ( French pronunciation: [bodo] )

5200-416: Is no longer used. In 1901, Baudot's code was modified by Donald Murray (1865–1945), prompted by his development of a typewriter-like keyboard. The Murray system employed an intermediate step: an operator used a keyboard perforator to punch a paper tape and then a transmitter to send the message from the punched tape . At the receiving end of the line, a printing mechanism would print on a paper tape, and/or

5330-602: Is significant in text). The cells marked as reserved for extensions (which use the LS code again a second time—just after the first LS code—to shift from the figures page to the letters shift page) has been defined to shift into a new mode. In this new mode, the letters page contains only lowercase letters, but retains access to a third code page for uppercase letters, either by encoding for a single letter (by sending LS before that letter), or locking (with FS+LS) for an unlimited number of capital letters or digits before then unlocking (with

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5460-423: Is unknown to many Italians because spelling is usually trivial, as Italian spelling is highly phonemic. In standard Spanish, one can tell the pronunciation of a word from its spelling, but not vice versa, as phonemes sometimes can be represented in more than one way, but a given letter is consistently pronounced. French using silent letters , nasal vowels , and elision , may seem to lack much correspondence between

5590-504: Is used on VHF or UHF frequencies. Standard transmission speeds are 45.45, 50, 75, 100, 150 and 300 baud. Common carrier shifts are 85 Hz (used on LF and VLF frequencies), 170 Hz, 425 Hz, 450 Hz and 850 Hz, although some stations use non-standard shifts. There are variations of the standard Baudot alphabet to cover languages written in Cyrillic, Arabic, Greek etc., using special techniques. Some combinations of speed and shift are standardized for specific services using

5720-673: The Real Academia Española changed it, so they are no longer considered letters at all. In German, words starting with sch- (which spells the German phoneme / ʃ / ) are inserted between words with initial sca- and sci- (all incidentally loanwords) instead of appearing after the initial sz , as though it were a single letter, which contrasts several languages such as Albanian , in which dh- , ë- , gj- , ll- , rr- , th- , xh-, and zh-, which all represent phonemes and considered separate single letters, would follow

5850-532: The Aramaic alphabet . Most alphabetic scripts of India and Eastern Asia descend from the Brahmi script , believed to be a descendant of Aramaic. European alphabets, especially Latin and Cyrillic, have been adapted for many languages of Asia. Arabic is also widely used, sometimes as an abjad, as with Urdu and Persian , and sometimes as a complete alphabet, as with Kurdish and Uyghur . In Korea , Sejong

5980-504: The Cyrillic letter mode was activated by the character (00000). Because of the larger number of characters in the Cyrillic alphabet, the characters ! , & , £ were omitted and replaced by Cyrillics, and BEL has the same code as Cyrillic letter Ю. The Cyrillic letters Ъ and Ё are omitted, and Ч is merged with the numeral 4. Alphabet An alphabet is a standard set of letters written to represent particular sounds in

6110-701: The Etruscan alphabet . One of these became the Latin alphabet, which spread across Europe as the Romans expanded their republic. After the fall of the Western Roman Empire , the alphabet survived in intellectual and religious works. It came to be used for the Romance languages that descended from Latin and most of the other languages of western and central Europe. Today, it is the most widely used script in

6240-563: The Greek alphabet was the first true alphabet; it was originally derived from the Phoenician alphabet , which was an abjad. Alphabets usually have a standard ordering for their letters. This makes alphabets a useful tool in collation , as words can be listed in a well-defined order—commonly known as alphabetical order . This also means that letters may be used as a method of "numbering" ordered items. Some systems demonstrate acrophony ,

6370-512: The Hanuno'o script , are learned one letter at a time, in no particular order, and are not used for collation where a definite order is required. However, a dozen Ugaritic tablets from the fourteenth century BCE preserve the alphabet in two sequences. One, the ABCDE order later used in Phoenician, has continued with minor changes in Hebrew , Greek , Armenian , Gothic , Cyrillic , and Latin ;

6500-488: The Intersil 6402 and 6403. These are stand-alone UART devices, similar to computer serial port peripherals. The 5 data bits allow for only 32 different codes, which cannot accommodate the 26 letters, 10 figures, space, a few punctuation marks and the required control codes , such as carriage return, new line, bell, etc. To overcome this limitation, the teleprinter has two states , the unshifted or letters state and

6630-471: The Late Latin word alphabetum , which in turn originated in the Greek ἀλφάβητος alphábētos ; it was made from the first two letters of the Greek alphabet, alpha (α) and beta (β). The names for the Greek letters, in turn, came from the first two letters of the Phoenician alphabet: aleph , the word for ox , and bet , the word for house . The Ancient Egyptian writing system had

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6760-551: The Phoenician alphabet . The Phoenician system is considered the first true alphabet and is the ultimate ancestor of many modern scripts, including Arabic , Cyrillic , Greek , Hebrew , Latin , and possibly Brahmic . Peter T. Daniels distinguishes true alphabets—which use letters to represent both consonants and vowels—from both abugidas and abjads , which only need letters for consonants. Abjads generally lack vowel indicators altogether, while abugidas represent them with diacritics added to letters. In this narrower sense,

6890-464: The minimum shift size for a given transmission speed. Electronic teleprinters can readily operate in a variety of speeds, but mechanical teleprinters require the change of gears in order to operate at different speeds. Today, both functions can be performed with modern computers equipped with digital signal processors or sound cards . The sound card performs the functions of the modem and the CPU performs

7020-448: The phoneme level—that is, it has separate glyphs for individual sounds and not for larger units such as syllables or words. In the narrower sense, some scholars distinguish "true" alphabets from two other types of segmental script, abjads , and abugidas . These three differ in how they treat vowels. Abjads have letters for consonants and leave most vowels unexpressed. Abugidas are also consonant-based but indicate vowels with diacritics ,

7150-473: The shifted or numbers or figures state. The change from one state to the other takes place when the special control codes LETTERS and FIGURES are sent from the keyboard or received from the line. In the letters state the teleprinter prints the letters and space while in the shifted state it prints the numerals and punctuation marks. Teleprinters for languages using other alphabets also use an additional third shift state, in which they print letters in

7280-521: The thorn ⟨þ⟩ in Old English and Icelandic , which came from the Futhark runes; and modified existing letters, such as the eth ⟨ð⟩ of Old English and Icelandic, which is a modified d . Other alphabets only use a subset of the Latin alphabet, such as Hawaiian and Italian, which uses the letters j, k, x, y, and w only in foreign words. Another notable script

7410-598: The (initial) letters mode. According to some sources, the Null code point was reserved for country-internal usage only. The Shift to Letters code (LS) is also usable as a way to cancel/delete text from a punched tape after it has been read, allowing the safe destruction of a message before discarding the punched band. Functionally, it can also play the same filler role as the Delete code in ASCII (or other 7-bit and 8-bit encodings, including EBCDIC for punched cards). After codes in

7540-405: The 15th century BCE. This was an alphabetic cuneiform script with 30 signs, including three that indicate the following vowel. This script was not used after the destruction of Ugarit in 1178 BCE. The Proto-Sinaitic script eventually developed into the Phoenician alphabet, conventionally called Proto-Canaanite , before c.  1050 BCE . The oldest text in Phoenician script

7670-564: The 16th century BCE, had 87 symbols, including five vowels. In its early years, there were many variants of the Greek alphabet, causing many different alphabets to evolve from it. The Greek alphabet, in Euboean form , was carried over by Greek colonists to the Italian peninsula c.  800–600 BCE giving rise to many different alphabets used to write the Italic languages , like

7800-478: The 1930s and expanded this usage during World War II. The Navy called radioteletype RATT (Radio Automatic Teletype) and the Army Signal Corps called radioteletype SCRT , an abbreviation of Single-Channel Radio Teletype. The military used frequency shift keying (FSK) technology and this technology proved very reliable even over long distances. A radioteletype station consists of three distinct parts:

7930-624: The English names got derived) preserve the qualities of the English vowels before the Great Vowel Shift. By contrast, the names of F, L, M, N, and S ( /ɛf, ɛl, ɛm, ɛn, ɛs/ ) remain the same in both languages because "short" vowels were largely unaffected by the Shift. In Cyrillic, originally, acrophony was present using Slavic words. The first three words going, azŭ, buky, vědě, with the Cyrillic collation order being, А, Б, В. However, this

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8060-530: The Great created the Hangul alphabet in 1443 CE. Hangul is a unique alphabet: it is a featural alphabet , where the design of many of the letters comes from a sound's place of articulation, like P looking like the widened mouth and L looking like the tongue pulled in. The creation of Hangul was planned by the government of the day, and it places individual letters in syllable clusters with equal dimensions, in

8190-460: The Latin alphabet. The exception was for decorative use, where the runes remained in use until the 20th century. The Old Hungarian script was the writing system of the Hungarians. It was in use during the entire history of Hungary, albeit not as an official writing system. From the 19th century, it once again became more and more popular. The Glagolitic alphabet was the initial script of

8320-987: The Navy successfully tested printing telegraphy between an airplane and ground radio station in August 1922. Later that year, the Radio Corporation of America successfully tested printing telegraphy via their Chatham, MA radio station to the RMS Majestic . An early implementation of the Radioteletype was the Watsongraph, named after Detroit inventor Glenn Watson in March 1931. Commercial RTTY systems were in active service between San Francisco and Honolulu as early as April 1932 and between San Francisco and New York City by 1934. The US Military used radioteletype in

8450-731: The Northwest Semitic "Abgad" order, is already well established. Although, languages using this alphabet have different conventions for their treatment of modified letters (such as the French é , à , and ô ) and certain combinations of letters ( multigraphs ). In French, these are not considered to be additional letters for collation. However, in Icelandic , the accented letters such as á , í , and ö are considered distinct letters representing different vowel sounds from sounds represented by their unaccented counterparts. In Spanish, ñ

8580-619: The Teletype or teleprinter, the modem and the radio . The Teletype or teleprinter is an electromechanical or electronic device. The word Teletype was a trademark of the Teletype Corporation, so the terms "TTY", "RTTY", "RATT" and "teleprinter" are usually used to describe a generic device without reference to a particular manufacturer. Electromechanical teleprinters are heavy, complex and noisy, and have largely been replaced with electronic units. The teleprinter includes

8710-525: The U.S. Federal Communications Commission (FCC) to amend Part 12 of the Regulations, which was effective on February 20, 1953. The amended Regulations permitted FSK in the non-voice parts of the 80 , 40 , and 20 meter bands and also specified the use of single channel 60 words-per-minute five unit code corresponding to ITA2 . A shift of 850 ± 50 Hz was specified. Amateur radio operators also had to identify their station callsign at

8840-482: The U.S. began to acquire surplus teleprinter and receive permission to get on the air. The first recorded RTTY contact in the U.K. occurred in September ;1959 between G2UK and G3CQE. A few weeks later, G3CQE had the first G/VE RTTY QSO with VE7KX. This was quickly followed up by G3CQE QSOs with VK3KF and ZL3HJ. Information on how to acquire surplus teleprinter equipment continued to spread and before long it

8970-901: The U.S. to identify their station callsign at the beginning and the end of each digital transmission, and at ten-minute intervals using International Morse code, was finally lifted by the FCC on June 15, 1983. RTTY has a typical baud rate for Amateur operation of 45.45 baud (approximately 60 words per minute). It remains popular as a "keyboard to keyboard" mode in Amateur Radio. RTTY has declined in commercial popularity as faster, more reliable alternative data modes have become available, using satellite or other connections. For its transmission speed, RTTY has low spectral efficiency . The typical RTTY signal with 170 Hz shift at 45.45 baud requires around 250 Hz receiver bandwidth, more than double that required by PSK31 . In theory, at this baud rate,

9100-462: The Ugaritic script were the first scripts with a limited number of signs instead of using many different signs for words, in contrast to cuneiform, Egyptian hieroglyphs, and Linear B . The Phoenician script was probably the first phonemic script, and it contained only about two dozen distinct letters, making it a script simple enough for traders to learn. Another advantage of the Phoenician alphabet

9230-578: The United States. For example, the first recorded USA to New Zealand two-way RTTY contact took place in 1956 between W0BP and ZL1WB. By the late 1950s, new organizations focused on amateur radioteletype started to appear. The "British Amateur Radio Teletype Group", BARTG, now known as the "British Amateur Radio Teledata Group" was formed in June 1959. The Florida RTTY Society was formed in September 1959. Amateur radio operators outside of Canada and

9360-417: The alternative alphabet. The modem is sometimes called the terminal unit and is an electronic device which is connected between the teleprinter and the radio transceiver . The transmitting part of the modem converts the digital signal transmitted by the teleprinter or tape reader to one or the other of a pair of audio frequency tones, traditionally 2295/2125 Hz (US) or 2125/1955 Hz (Europe). One of

9490-531: The beginning and the end of each transmission and at ten-minute intervals using International Morse code . Use of this wide shift proved to be a problem for amateur radio operations. Commercial operators had already discovered that narrow shift worked best on the HF bands . After investigation and a petition to the FCC, Part 12 was amended, in March ;1956, to allow amateur radio operators to use any shift that

9620-413: The continental code are replaced by fractionals in the inland code. Code elements 1, 2 and 3 are transmitted by keys 1, 2 and 3, and these are operated by the first three fingers of the right hand. Code elements 4 and 5 are transmitted by keys 4 and 5, and these are operated by the first two fingers of the left hand." Baudot's code became known as the International Telegraph Alphabet No. 1 ( ITA1 ). It

9750-468: The corresponding characters are typed. "ENQuiry" will trigger the other machine's answerback. It means "Who are you?" CR is carriage return , LF is line feed , BEL is the bell character which rang a small bell (often used to alert operators to an incoming message), SP is space, and NUL is the null character (blank tape). Note: the binary conversions of the codepoints are often shown in reverse order, depending on (presumably) from which side one views

9880-801: The discovery of the Rosetta Stone . There was also cuneiform , primarily used to write several ancient languages, including Sumerian . The last known use of cuneiform was in 75 CE, after which the script fell out of use. In the Middle Bronze Age , an apparently alphabetic system known as the Proto-Sinaitic script appeared in Egyptian turquoise mines in the Sinai Peninsula c.  1840 BCE , apparently left by Canaanite workers. Orly Goldwasser has connected

10010-598: The earlier forms. The script in its classical form was used until the 1st century CE. The Etruscan language itself was not used during the Roman Empire , but the script was used for religious texts. Some adaptations of the Latin alphabet have ligatures , a combination of two letters make one, such as æ in Danish and Icelandic and ⟨ Ȣ ⟩ in Algonquian ; borrowings from other alphabets, such as

10140-589: The early 1970s, amateur radio RTTY had spread around the world and it was finally possible to work more than 100 countries via RTTY. FG7XT was the first amateur radio station to claim to achieve this honor. However, Jean did not submit his QSL cards for independent review. ON4BX, in 1971, was the first amateur radio station to submit his cards to the DX editor of RTTY Journal and to achieve this honor. The ARRL began issuing DXCC RTTY Awards on November 1, 1976. Prior to that date, an award for working 100 countries on RTTY

10270-640: The early days of Amateur RTTY, the RTTY Worked All Continents Award was conceived by the RTTY Society of Southern California and issued by RTTY Journal. The first amateur radio station to achieve this WAC – RTTY Award was VE7KX. The first stations recognized as having achieved single band WAC RTTY were W1MX ( 3.5 MHz ); DL0TD ( 7.0 MHz ); K3SWZ ( 14.0 MHz ); W0MT ( 21.0 MHz ) and FG7XT ( 28.0 MHz ). The ARRL began issuing WAC RTTY certificates in 1969. By

10400-572: The emergence of terminal units designed by W6FFC, such as the TT/L, ST-3, ST-5, and ST-6. These designs were first published in RTTY Journal starting in September 1967 and ending in 1970. An adaptation of the W6FFC TT/L terminal unit was developed by Keith Petersen, W8SDZ, and it was first published in the RTTY Journal in September 1967. The drafting of the schematic in the article

10530-402: The entire final -an . While bopomofo is not a mainstream writing system, it is still often used in ways similar to a romanization system, for aiding pronunciation and as an input method for Chinese characters on computers and cellphones. The term "alphabet" is used by linguists and paleographers in both a wide and a narrow sense. In a broader sense, an alphabet is a segmental script at

10660-481: The first alphabet had developed about that time. The script was based on letter appearances and names, believed to be based on Egyptian hieroglyphs. This script had no characters representing vowels. Originally, it probably was a syllabary—a script where syllables are represented with characters—with symbols that were not needed being removed. The best-attested Bronze Age alphabet is Ugaritic , invented in Ugarit before

10790-504: The following characters are to be interpreted as being in the FIGS set, until this is reset by the LTRS (11111) character. In use, the LTRS or FIGS shift key is pressed and released, transmitting the corresponding shift character to the other machine. The desired letters or figures characters are then typed. Unlike a typewriter or modern computer keyboard, the shift key isn't kept depressed whilst

10920-432: The illiterate turquoise miner graffiti theory to the origin of the alphabet. In 1999, American Egyptologists John and Deborah Darnell discovered an earlier version of this first alphabet at the Wadi el-Hol valley. The script dated to c.  1800 BCE and shows evidence of having been adapted from specific forms of Egyptian hieroglyphs that could be dated to c.  2000 BCE , strongly suggesting that

11050-534: The keyboard was unlocked ready for the next character to be entered, with an audible click (known as the "cadence signal") to warn the operator. Operators had to maintain a steady rhythm, and the usual speed of operation was 30 words per minute. The table "shows the allocation of the Baudot code which was employed in the British Post Office for continental and inland services. A number of characters in

11180-452: The late 1950s, the contest exchange was expanded to include band used. Example: NR 23 W0BP CK MINN 1325 FEB 15 FORTY METERS. The contest was scored as follows: One point for each message sent and received entirely by RTTY and one point for each message received and acknowledged by RTTY. The final score was computed by multiplying the total number of message points by the number of ARRL sections worked. Two stations could exchange messages again on

11310-447: The letters ⟨d, e, g, l, n, r, t, x, z⟩ respectively, as well as Hungarian and Welsh. Further, German words with an umlaut get collated ignoring the umlaut as—contrary to Turkish , which adopted the graphemes ö and ü , and where a word like tüfek would come after tuz , in the dictionary. An exception is the German telephone directory, where umlauts are sorted like ä = ae since names such as Jäger also appear with

11440-401: The lights glow with equal brightness when the tuning was correct. This tuning sequence is only useful when ITA2 is used with two-tone FSK modulation, such as is commonly seen in radioteletype (RTTY) usage. US implementations of Baudot code may differ in the addition of a few characters, such as #, & on the FIGS layer. The Russian version of Baudot code ( MTK-2 ) used three shift modes;

11570-494: The liturgical language Old Church Slavonic and became, together with the Greek uncial script, the basis of the Cyrillic script . Cyrillic is one of the most widely used modern alphabetic scripts and is notable for its use in Slavic languages and also for other languages within the former Soviet Union . Cyrillic alphabets include Serbian , Macedonian , Bulgarian , Russian , Belarusian , and Ukrainian . The Glagolitic alphabet

11700-540: The most common one being " The quick brown fox jumps over the lazy dog ", and in French circuits, "Voyez le brick géant que j'examine près du wharf" The original (or "Baudot") radioteletype system is based almost invariably on the Baudot code or ITA-2 5 bit alphabet. The link is based on character asynchronous transmission with 1 start bit and 1, 1.5 or 2 stop bits. Transmitter modulation is normally FSK ( F1B ). Occasionally, an AFSK signal modulating an RF carrier (A2B, F2B)

11830-535: The most common vowel is not marked in Indic abugidas. In Zhuyin , not only is one of the tones unmarked; but there is a diacritic to indicate a lack of tone, like the virama of Indic. Alphabets often come to be associated with a standard ordering of their letters; this is for collation —namely, for listing words and other items in alphabetical order . The ordering of the Latin alphabet ( A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ), which derives from

11960-438: The nature of ionospheric propagation. The FCC approved the use of ASCII by amateur radio stations on March 17, 1980 with speeds up to 300  baud from 3.5 MHz to 21.25 MHz and 1200 baud between 28 MHz and 225 MHz . Speeds up to 19.2 kilobaud was authorized on amateur frequencies above 420 MHz . These symbol rates were later modified: The requirement for amateur radio operators in

12090-544: The one-hole letters are E and T. The ten two-hole letters are AOINSHRDLZ, very similar to the " Etaoin shrdlu " order used in Linotype machines . Ten more letters, BCGFJMPUWY, have three holes each, and the four-hole letters are VXKQ. The Murray code also introduced what became known as "format affectors" or " control characters " – the CR (Carriage Return) and LF (Line Feed) codes. A few of Baudot's codes moved to

12220-865: The original radioteletype system: After World War II, amateur radio operators in the U.S. started to receive obsolete but usable Teletype Model 26 equipment from commercial operators with the understanding that this equipment would not be used for or returned to commercial service. "The Amateur Radioteletype and VHF Society" was founded in 1946 in Woodside, NY. This organization soon changed its name to "The VHF Teletype Society" and started US amateur radio operations on 2 meters using audio frequency shift keying (AFSK). The first two-way amateur radio teletype contact ( QSO ) of record took place in May ;1946 between Dave Winters, W2AUF, Brooklyn, NY, and W2BFD, John Evans Williams, Woodside Long Island, NY. On

12350-505: The other, HMĦLQ, was used in southern Arabia and is preserved today in Geʻez . Both orders have therefore been stable for at least 3000 years. Runic used an unrelated Futhark sequence, which got simplified later on. Arabic usually uses its sequence, although Arabic retains the traditional abjadi order , which is used for numbers. The Brahmic family of alphabets used in India uses

12480-508: The paper tape. Note further that the "control" characters were chosen so that they were either symmetric or in useful pairs so that inserting a tape "upside down" did not result in problems for the equipment and the resulting printout could be deciphered. Thus FIGS (11011), LTRS (11111) and space (00100) are invariant, while CR (00010) and LF (01000), generally used as a pair, are treated the same regardless of order by page printers. LTRS could also be used to overpunch characters to be deleted on

12610-546: The positions where they have stayed ever since: the NULL or BLANK and the DEL code. NULL/BLANK was used as an idle code for when no messages were being sent, but the same code was used to encode the space separation between words. Sequences of DEL codes (fully punched columns) were used at start or end of messages or between them which made it easier to separate distinct messages. (BELL codes could be inserted in those sequences to signal to

12740-402: The problem of dialects by associating the alphabet with the national standard. Some national languages like Finnish , Armenian , Turkish , Russian, Serbo-Croatian ( Serbian , Croatian , and Bosnian ), and Bulgarian have a very regular spelling system with nearly one-to-one correspondence between letters and phonemes. Similarly, the Italian verb corresponding to 'spell (out),' compitare ,

12870-451: The processing of the digital bits. This approach is very common in amateur radio , using specialized computer programs like fldigi , MMTTY or MixW. Before the computer mass storage era, most RTTY stations stored text on paper tape using paper tape punchers and readers. The operator would type the message on the TTY keyboard and punch the code onto the tape. The tape could then be transmitted at

13000-527: The remote operator that a new message was coming or that transmission of a message was terminated). Early British Creed machines also used the Murray system. Murray's code was adopted by Western Union which used it until the 1950s, with a few changes that consisted of omitting some characters and adding more control codes. An explicit SPC (space) character was introduced, in place of the BLANK/NULL, and

13130-568: The same way as Chinese characters . This change allows for mixed-script writing, where one syllable always takes up one type space no matter how many letters get stacked into building that one sound-block. Bopomofo , also referred to as zhuyin , is a semi-syllabary used primarily in Taiwan to transcribe the sounds of Standard Chinese . Following the proclamation of the People's Republic of China in 1949 and its adoption of Hanyu Pinyin in 1956,

13260-404: The shift size can be decreased to 22.725 Hz, reducing the overall band footprint substantially. Because RTTY, using either AFSK or FSK modulation, produces a waveform with constant power, a transmitter does not need to use a linear amplifier , which is required for many digital transmission modes. A more efficient Class C amplifier may be used. RTTY, using either AFSK or FSK modulation,

13390-500: The spelling Jaeger and are not distinguished in the spoken language. The Danish and Norwegian alphabets end with ⟨æ, ø, å⟩ , whereas the Swedish conventionally put ⟨å, ä, ö⟩ at the end. However, æ phonetically corresponds with ⟨ä⟩ , as does ⟨ø⟩ and ⟨ö⟩ . It is unknown whether the earliest alphabets had a defined sequence. Some alphabets today, such as

13520-507: The spelling and pronunciation. However, its rules on pronunciation, though complex, are consistent and predictable with a fair degree of accuracy. At the other extreme are languages such as English, where pronunciations mostly have to be memorized as they do not correspond to the spelling consistently. For English, this is because the Great Vowel Shift occurred after the orthography got established and because English has acquired

13650-543: The stations exchanged solid print congratulatory message traffic and rag-chewed . Earlier, on January 23, 1949, William T. Knott, W2QGH, Larchmont, NY, had been able to make rough copy of W6PSW's test transmissions. While contacts could be accomplished, it was quickly realized that FSK was technically superior to make and break keying. Due to the efforts of Merrill Swan, W6AEE, of "The RTTY Society of Southern California" publisher of RTTY and Wayne Green, W2NSD, of CQ Magazine , amateur radio operators successfully petitioned

13780-464: The tables of codes correctly identifies it as ITA2. The values shown in each cell are the Unicode codepoints, given for comparison. Meteorologists used a variant of ITA2 with the figures-case symbols, except for the ten digits, BEL and a few other characters, replaced by weather symbols: Note: This table presumes the space called "1" by Baudot and Murray is rightmost, and least significant. The way

13910-532: The term zed for Z in all forms of English, other than American English. Over time names sometimes shifted or were added, as in double U for W , or "double V" in French, the English name for Y, and the American zee for Z. Comparing them in English and French gives a clear reflection of the Great Vowel Shift : A, B, C, and D are pronounced /eɪ, biː, siː, diː/ in today's English, but in contemporary French they are /a, be, se, de/ . The French names (from which

14040-442: The tones corresponds to the mark condition and the other to the space condition. These audio tones, then, modulate an SSB transmitter to produce the final audio-frequency shift keying (AFSK) radio frequency signal. Some transmitters are capable of direct frequency-shift keying (FSK) as they can directly accept the digital signal and change their transmitting frequency according to the mark or space input state. In this case

14170-422: The transmitted bits were packed into larger codes varied by manufacturer. The most common solution allocates the bits from the least significant bit towards the most significant bit (leaving the three most significant bits of a byte unused). In ITA2, characters are expressed using five bits. ITA2 uses two code sub-sets, the "letter shift" (LTRS), and the "figure shift" (FIGS). The FIGS character (11011) signals that

14300-502: The transmitting part of the modem is bypassed. On reception, the FSK signal is converted to the original tones by mixing the FSK signal with a local oscillator called the BFO or beat frequency oscillator . These tones are fed to the demodulator part of the modem, which processes them through a series of filters and detectors to recreate the original digital signal. The FSK signals are audible on

14430-520: The use of bopomofo on the mainland is limited. Bopomofo developed from a form of Chinese shorthand based on Chinese characters in the early 1900s and has elements of both an alphabet and a syllabary. Like an alphabet, the phonemes of syllable initials are represented by individual symbols, but like a syllabary, the phonemes of the syllable finals are not; each possible final (excluding the medial glide ) has its own character, an example being luan written as ㄌㄨㄢ ( l-u-an ). The last symbol ㄢ takes place as

14560-513: The various types. Some alphabets disregard tone entirely, especially when it does not carry a heavy functional load, as in Somali and many other languages of Africa and the Americas. Most commonly, tones are indicated by diacritics, which is how vowels are treated in abugidas, which is the case for Vietnamese (a true alphabet) and Thai (an abugida). In Thai, the tone is determined primarily by

14690-520: The vowels is mandatory, and whole letters are used, so the script is a true alphabet. Other languages may use a Semitic abjad with forced vowel diacritics, effectively making them abugidas. On the other hand, the ʼPhags-pa script of the Mongol Empire was based closely on the Tibetan abugida , but vowel marks are written after the preceding consonant rather than as diacritic marks. Although short

14820-609: The west coast, amateur RTTY also started on 2 meters. Operation on 80 meters, 40 meters and the other High Frequency (HF) amateur radio bands was initially accomplished using make and break keying since frequency shift keying (FSK) was not yet authorized. In early 1949, the first American transcontinental two-way RTTY contact was accomplished on 11 meters using AFSK between Tom McMullen (W1QVF) operating at W1AW and Johnny Agalsoff, W6PSW. The stations effected partial contact on January 30, 1949, and repeated more successfully on January 31. On February 1, 1949,

14950-411: The world. The Etruscan alphabet remained nearly unchanged for several hundred years. Only evolving once the Etruscan language changed itself. The letters used for non-existent phonemes were dropped. Afterwards, however, the alphabet went through many different changes. The final classical form of Etruscan contained 20 letters. Four of them are vowels— ⟨a, e, i, u⟩ —six fewer letters than

15080-486: The world. The discovery suggests that the alphabet emerged 500 years earlier than previously thought, and undermines leading ideas about how it was invented. According to Christopher Rollston , a scholar of the ancient Near East, the morphology of the letters on the cylinder seals parallels quite nicely that of the existing corpus of early alphabetic writing. This theory however has yet to be universally accepted. The English word alphabet came into Middle English from

15210-686: The writing with the contemporary spoken language. These can range from simple spelling changes and word forms to switching the entire writing system. For example, Turkey switched from the Arabic alphabet to a Latin-based Turkish alphabet , and Kazakh changed from an Arabic script to a Cyrillic script due to the Soviet Union's influence. In 2021, it made a transition to the Latin alphabet, similar to Turkish. The Cyrillic script used to be official in Uzbekistan and Turkmenistan before they switched to

15340-637: Was 900 Hz or less. The FCC Notice of Proposed Rule Making (NPRM) that resulted in the authorization of FSK in the amateur high frequency (HF) bands responded to petitions by the American Radio Relay League (ARRL), the National Amateur Radio Council, and a Mr. Robert Weinstein. The NPRM specifically states this, and this information may be found in its entirety in the December ;1951 issue of QST Magazine . While The New RTTY Handbook gives ARRL no credit, it

15470-411: Was abandoned in Latin . It referred to the letters by adding a vowel—usually ⟨e⟩ , sometimes ⟨a⟩ or ⟨u⟩ —before or after the consonant. Two exceptions were Y and Z , which were borrowed from the Greek alphabet rather than Etruscan. They were known as Y Graeca "Greek Y" and zeta (from Greek)—this discrepancy was inherited by many European languages, as in

15600-504: Was capable of being upgraded to 75 and 100 words per minute by changing teleprinter gears. While there was an initial interest in 100  WPM operation, many amateur radio operators moved back to 60  WPM . Some of the reasons for the failure of 100  WPM HF RTTY included poor operation of improperly maintained mechanical teleprinters, narrow bandwidth terminal units, continued use of 170 Hz shift at 100  WPM , and excessive error rates due to multipath distortion and

15730-476: Was descended. Abugidas are writing systems with characters comprising consonant–vowel sequences. Alphabets without obligatory vowels are called abjads , with examples being Arabic, Hebrew, and Syriac . The omission of vowels was not always a satisfactory solution due to the need of preserving sacred texts. "Weak" consonants are used to indicate vowels. These letters have a dual function since they can also be used as pure consonants. The Proto-Sinaitic script and

15860-474: Was done by Ralph Leland, W8DLT. Amateur radio operators needed to modify their transmitters to allow for HF RTTY operation. This was accomplished by adding a frequency shift keyer that used a diode to switch a capacitor in and out of the circuit, shifting the transmitter’s frequency in synchronism with the teleprinter signal changing from mark to space to mark. A very stable transmitter was required for RTTY. The typical frequency multiplication type transmitter that

15990-479: Was home built, using designs published in amateur radio publications. These original designs can be divided into two classes of terminal units: audio-type and intermediate frequency converters. The audio-type converters proved to be more popular with amateur radio operators. The Twin City, W2JAV and W2PAT designs were examples of typical terminal units that were used into the middle 1960s. The late 1960s and early 1970s saw

16120-412: Was later abandoned in favor of a system similar to Latin. When an alphabet is adopted or developed to represent a given language, an orthography generally comes into being, providing rules for spelling words, following the principle on which alphabets get based. These rules will map letters of the alphabet to the phonemes of the spoken language. In a perfectly phonemic orthography , there would be

16250-636: Was only available via RTTY Journal. In the 1950s through the 1970s, " RTTY art " was a popular on-air activity. This consisted of (sometimes very elaborate and artistic) pictures sent over RTTY through the use of lengthy punched tape transmissions and then printed by the receiving station on paper. On January 7, 1972, the FCC amended Part 97 to allow faster RTTY speeds. Four standard RTTY speeds were authorized, namely, 60  words per minute ( WPM ) (45  baud ), 67  WPM (50 baud), 75  WPM (56.25 baud), and 100  WPM (75 baud). Many amateur radio operators had equipment that

16380-414: Was popular in the 1950s and 1960s would be relatively stable on 80 meters but become progressively less stable on 40 meters , 20 meters , and 15 meters . By the middle 1960s, transmitter designs were updated, mixing a crystal-controlled high frequency oscillator with a variable low frequency oscillator, resulting in better frequency stability across all amateur radio HF bands. During

16510-422: Was possible to work all continents on RTTY. Amateur radio operators used various equipment designs to get on the air using RTTY in the 1950s and 1960s. Amateurs used their existing receivers for RTTY operation but needed to add a terminal unit, sometimes called a demodulator, to convert the received audio signals to DC signals for the teleprinter. Most of the terminal unit equipment used for receiving RTTY signals

16640-663: Was published by CQ Magazine and its author was a CQ columnist ( CQ was generally hostile to the ARRL at that time). The first RTTY Contest was held by the RTTY Society of Southern California from October 31 to November 1, 1953. Named the RTTY Sweepstakes Contest, twenty nine participants exchanged messages that contained a serial number, originating station call, check or RST report of two or three numbers, ARRL section of originator, local time (0000-2400 preferred) and date. Example: NR 23 W0BP CK MINN 1325 FEB 15. By

16770-555: Was that it could write different languages since it recorded words phonemically. The Phoenician script was spread across the Mediterranean by the Phoenicians. The Greek alphabet was the first in which vowels had independent letterforms separate from those of consonants. The Greeks chose letters representing sounds that did not exist in Phoenician to represent vowels. The Linear B syllabary, used by Mycenaean Greeks from

16900-404: Was used until the 5th century CE, and fundamentally differed by adding pronunciation hints to existing hieroglyphs that had previously carried no pronunciation information. Later on, these phonemic symbols also became used to transcribe foreign words. The first fully phonemic script was the Proto-Sinaitic script , also descending from Egyptian hieroglyphs, which was later modified to create

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