The first chips that could be considered microprocessors were designed and manufactured in the late 1960s and early 1970s, including the MP944 used in the Grumman F-14 CADC.[1] Intel's 4004 of 1971 is widely regarded as the first commercial microprocessor.[2]
Designers predominantly used MOSFET transistors with pMOS logic in the early 1970s, switching to nMOS logic after the mid-1970s. nMOS had the advantage that it could run on a single voltage, typically +5V, which simplified the power supply requirements and allowed it to be easily interfaced with the wide variety of +5V transistor-transistor logic (TTL) devices. nMOS had the disadvantage that it was more susceptible to electronic noise generated by slight impurities in the underlying silicon material, and it was not until the mid-1970s that these, sodium in particular, were successfully removed to the required levels. At that time, around 1975, nMOS quickly took over the market.[3]
This corresponded with the introduction of new semiconductor masking systems, notably the Micralign system from Perkin-Elmer. Micralign projected an image of the mask onto the silicon wafer, never touching it directly, which eliminated the previous problems when the mask would be lifted off the surface and take away some of the photoresist along with it, ruining the chips on that portion of the wafer.[4] By reducing the number of flawed chips, from about 70% to 10%, the cost of complex designs like early microprocessors fell by the same amount. Systems based on contact aligners cost on the order of $300 in single-unit quantities, the MOS 6502, designed specifically to take advantage of these improvements, cost only $25.[5]
This period also saw considerable experimentation with various word lengths. Early on, 4-bit processors were common, like the Intel 4004, simply because making a wider word length could not be accomplished cost-effectively in the room available on the small wafers of the era, especially when the majority would be defective. As yields improved, wafer sizes grew, and feature size continued to be reduced, more complex 8-bit designs emerged like the Intel 8080 and 6502. 16-bit processors emerged early but were expensive; by the decade's end, low-cost 16-bit designs like the Zilog Z8000 were becoming common. Some unusual word lengths were also produced, including 12-bit and 20-bit, often matching a design that had previously been implemented in a multi-chip format in a minicomputer. These had largely disappeared by the end of the decade as minicomputers moved to 32-bit formats.
^The AL1 chip is an 8-bit slice arithmetic logic unit with registers. Four-Phase did not sell the AL1 individually but as part of a system combining three of these 8-bit AL1 chips to yield a multi-chip CPU with a 24-bit word size.
^A 1995 court demo combined one AL1 with ROM, RAM, and I/0 to argue that the AL1 alone be considered a microprocessor.[7] But because it requires an external microcode controller, another view disagrees.[8]
^TMS1802NC is the original designation of the TMS0102, which is considered a microcontroller because it incorporates all program ROM internally. It can't execute external code and programming is done during manufacture. The term microprocessor may instead be reserved for devices that can execute external code.
^According to Ogdin 1975, the Fairchild PPS-25 was first delivered in 2Q 1971 and the Intel 4004 in 4Q 1971.
^The 16-bit registers and ALU were implemented by combining four identical 4-bit slice chips. The National Semiconductor PACE reimplemented its architecture as the first single-chip 16-bit microprocessor.
^Internally is an 8-bit processor, but is micro-programmed to emulate a 16-bit CPU.
^Later microprocessors reused this chipset, for instance the LSI-11 in 1975 used 4 chips and the WD16 in 1976 used 5 chips.
^The Intel 8088 had an 8-bit external data bus, but internally used a 16-bit architecture.
^The Motorola 68000 had a 16-bit external data bus, but internally used 32-bit registers.
1980s
As Moore's Law continued to drive the industry towards more complex chip designs, the expected widespread move from 8-bit designs of the 1970s to 16-bit designs almost didn't occur; instead, new 32-bit designs like the Motorola 68000 and National Semiconductor NS32000 emerged that offered far more performance. The only widespread use of 16-bit systems was in the IBM PC, which had selected the Intel 8088 in 1979 before the new designs had matured.
Another change was the move to CMOS gates as the primary method of building complex CPUs. CMOS had been available since the early 1970s; RCA introduced the COSMAC processor using CMOS in 1975.[43] Whereas earlier systems used a single transistor as the basis for each "gate", CMOS used a two-sided design, essentially making it twice as expensive to build. Its advantage was that its logic was not based on the voltage of a transistor compared to the silicon substrate, but the difference in voltages between the two sides, which was detectable at much lower power levels.[citation needed] As processor complexity continued to grow, power dissipation had become a significant concern and chips were prone to overheating; CMOS greatly reduced this problem and quickly took over the market.[44] This was aided by the uptake of CMOS by Japanese firms while US firms remained on nMOS, giving the Japanese industry a major advance during the 1980s.[45]
Semiconductor fabrication techniques continued to improve throughout. The Micralign, which had "created the modern IC industry", was obsolete by the early 1980s. They were replaced by the new steppers, which used high magnifications and extremely powerful light sources to allow a large mask to be copied onto the wafer at ever-smaller sizes. This technology allowed the industry to break below the former 1 micron limit.
Key home computers in the early part of the decade predominantly use processors developed in the 1970s. Versions of the 6502, first released in 1975, powered the Commodore 64, Apple II, BBC Micro, and Atari 8-bit computers. The 8-bit Zilog Z80 (1976) is at the core of the ZX Spectrum, MSX systems and many others. The 8086-based IBM PC, launched in 1981, started the move to 16-bit, but was soon passed by the 68000-based 16/32-bit Macintosh, then the Atari ST and Amiga. IBM PC compatibles moved to 32-bit with the introduction of the Intel 80386 in late 1985, although 386-based systems were considerably expensive at the time.
In addition to ever-growing word lengths, microprocessors began to add additional functional units that had previously been optional external parts. By the middle of the decade, memory management units (MMUs) were becoming commonplace, first appearing on designs like the Intel 80286 and Motorola 68030. By the end of the decade, floating point units (FPUs) were being added, first appearing on 1989s Intel 486 and followed the next year by the Motorola 68040.
Another change that began during the 1980s involved overall design philosophy with the emergence of the reduced instruction set computer, or RISC. Although the concept was first developed by IBM in the 1970s, the company did not introduce powerful systems based on it, largely for fear of cannibalizing their sales of larger mainframe systems. Market introduction was driven by smaller companies like MIPS Technologies, SPARC and ARM. These companies did not have access to high-end fabrication like Intel and Motorola, but were able to introduce chips that were highly competitive with those companies with a fraction of the complexity. By the end of the decade, every major vendor was introducing a RISC design of their own, like the IBM POWER, Intel i860 and Motorola 88000.
The 32-bit microprocessor dominated the consumer market in the 1990s. Processor clock speeds increased by more than tenfold between 1990 and 1999, and 64-bit processors began to emerge later in the decade. In the 1990s, microprocessors no longer used the same clock speed for the processor and the RAM. Processors began to have a front-side bus (FSB) clock speed used in communication with RAM and other components. Typically, the processor itself ran at a clock speed that was a multiple of the FSB clock speed. Intel's Pentium III, for example, had an internal clock speed of 450–600 MHz and an FSB speed of 100–133 MHz. Only the processor's internal clock speed is shown here.
64-bit processors became mainstream in the 2000s. Microprocessor clock speeds reached a ceiling because of the heat dissipation barrier[citation needed]. Instead of implementing expensive and impractical cooling systems, manufacturers turned to parallel computing in the form of the multi-core processor. Overclocking had its roots in the 1990s, but came into its own in the 2000s. Off-the-shelf cooling systems designed for overclocked processors became common, and the gaming PC had its advent as well. Over the decade, transistor counts increased by about an order of magnitude, a trend continued from previous decades. Process sizes decreased about fourfold, from 180 nm to 45 nm.
A new trend appears, the multi-chip module made of several chiplets. This is multiple monolithic chips in a single package. This allows higher integration with several smaller and easier to manufacture chips.
^ abDavid Russell (February 1978). "Microprocessor survey". Microprocessors. 2 (1): 13–20, See p. 18. doi:10.1016/0308-5953(78)90071-5.
^Allen Kent, James G. Williams, ed. (1990). "Evolution of Computerized Maintenance Management to Generation of Random Numbers". Encyclopedia of Microcomputers. Vol. 7. Marcel Dekker. p. 336. ISBN0-8247-2706-1.
^Hans Hoffman; John Nemec (April 1977). "A fast microprocessor for control applications". Euromicro Newsletter. 3 (3): 53–59. doi:10.1016/0303-1268(77)90010-4.
^ abKimura S, Komoto Y, Yano Y (1988). "Implementation of the V60/V70 and its FRM function". IEEE Micro. 8 (2): 22–36. doi:10.1109/40.527. S2CID9507994.
^
C Green; P Gülzow; L Johnson; K Meinzer; J Miller (Mar–Apr 1999). "The Experimental IHU-2 Aboard P3D". Amsat Journal. 22 (2). The first processor using these principles, called ARM-1, was fabricated by VLSI in April 1985, and gave startling performance for the time, whilst using barely 25,000 transistors
^Inayoshi H, Kawasaki I, Nishimukai T, Sakamura K (1988). "Realization of Gmicro/200". IEEE Micro. 8 (2): 12–21. doi:10.1109/40.526. S2CID36938046.
^Moore CR, Balser DM, Muhich JS, East RE (1992). "IBM Single Chip RISC Processor (RSC)"(PDF). Proceedings of the 1991 IEEE International Conference on Computer Design on VLSI in Computer & Processors. IEEE Computer Society. pp. 200–4. ISBN0-8186-3110-4. Archived from the original(PDF) on 2013-10-04. Retrieved 2008-11-15.
У Вікіпедії є статті про інші значення цього терміна: Знання (значення). Знання Досліджується в епістемологія, теорія пізнання, соціологія знань і філософія Частково збігається з розуміння і досвід Є об'єднанням див. список:d і див. список:d Протилежне нев�...
Town in South AustraliaPort GermeinSouth AustraliaPort Germein jetty, Dec 2008Port GermeinCoordinates33°01′0″S 138°00′0″E / 33.01667°S 138.00000°E / -33.01667; 138.00000Population249 (2006 census)[1]Established1878Postcode(s)5495[2]Location 219 km (136 mi) N of Adelaide 19 km (12 mi) N of Port Pirie 15 km (9 mi) N of Weeroona Island LGA(s)District Council of Mount RemarkableState electorate(s)Stuart[3&...
American politician (1834–1916) For other people named Robert Wilson, see Robert Wilson (disambiguation). St. Louis Daily Globe-Democrat, November 6, 1890 Robert Patterson Clark Wilson (August 8, 1834 – December 21, 1916) was a U.S. Representative from Missouri. Born in Boonville, Missouri, Wilson moved with his parents to Platte County. He attended William Jewell College, Liberty, Missouri, and was graduated from Centre College, Danville, Kentucky, in 1853. He studied law. He was admitte...
Bagian dari seriIlmu Pengetahuan Formal Logika Matematika Logika matematika Statistika matematika Ilmu komputer teoretis Teori permainan Teori keputusan Ilmu aktuaria Teori informasi Teori sistem FisikalFisika Fisika klasik Fisika modern Fisika terapan Fisika komputasi Fisika atom Fisika nuklir Fisika partikel Fisika eksperimental Fisika teori Fisika benda terkondensasi Mekanika Mekanika klasik Mekanika kuantum Mekanika kontinuum Rheologi Mekanika benda padat Mekanika fluida Fisika plasma Ter...
Supreme Court of the United States38°53′26″N 77°00′16″W / 38.89056°N 77.00444°W / 38.89056; -77.00444EstablishedMarch 4, 1789; 235 years ago (1789-03-04)LocationWashington, D.C.Coordinates38°53′26″N 77°00′16″W / 38.89056°N 77.00444°W / 38.89056; -77.00444Composition methodPresidential nomination with Senate confirmationAuthorized byConstitution of the United States, Art. III, § 1Judge term lengthl...
Pit or stone within a drupe or fruit Diagram of a typical drupe, in this case a peach, illustrating the layers of both the fruit and the seed; the pyrene is the hardened endocarp which encloses the seed This article is about fruitstones. For the organelle within the chloroplast of some algae and hornworts, see pyrenoid. For other uses of pyrene, see Pyrene (disambiguation). Not to be confused with Pirene. A pyrena or pyrene (commonly called a pit or stone) is the fruitstone within a drupe or ...
У этого термина существуют и другие значения, см. Западный округ. Западный внутригородской округ город Краснодар Дата основания 1936 год Дата упразднения 1994 Прежние имена Кагановичский, Ленинский районы Микрорайоны Дубинка, Черёмушки, Покровка Площадь 22[1] км² Насе...
Brigitte FouréMayor of AmiensIncumbentAssumed office 4 April 2014Preceded byGilles DemaillyIn office27 June 2002 – 29 March 2007Preceded byGilles de RobienSucceeded byGilles de RobienFirst Vice-President of the Regional Council of Hauts-de-FranceIncumbentAssumed office 23 November 2017Member of the General Council of SommeIn office28 June 2010 – 8 September 2014Member of the European ParliamentIn office10 January 2008 – 13 July 2009Preceded byJean-Lou...
Disambiguazione – Se stai cercando l'attuale diocesi, vedi Diocesi di Ratisbona. Vescovato di Ratisbona Dati amministrativiNome completoPrincipato Vescovile di Ratisbona Nome ufficialeFürstbistum Regensburg Lingue ufficialitedesca CapitaleRatisbona Dipendente da Sacro Romano Impero PoliticaForma di StatoTeocrazia Forma di governomonarchia elettiva NascitaXIII secolo con Sant'Alberto Magno CausaConcessione del titolo di principe-vescovo Fine1803 con Joseph Konrad von Schroffenberg CausaRei...
2015 Bodoland Territorial Council election ← 2010 8 April 2015 2020 → All 40 seats in the Bodoland Territorial CouncilTurnout2,065,956 (78.18%)[1] First party Second party Third party Leader Hagrama Mohilary Badruddin Ajmal undeclared Party BPF AIUDF BJP Leader's seat Deborgaon (ST) none Seats won 20 4 1 Seat change 11 4 1 Popular vote 441,437 58,692 200,494 Chief before election Hagrama Mohilary Bodoland People's Front Elected C...
Ancient name for the island of Great Britain This article is about the archaic name for Britain. For other uses, see Albion (disambiguation). The White Cliffs of Dover may have given rise to the name Albion. Albion is an alternative name for Great Britain. The oldest attestation of the toponym comes from the Greek language. It is sometimes used poetically and generally to refer to the island, but is less common than Britain today. The name for Scotland in most of the Celtic languages is relat...
Artikel ini memuat Surat Lampung. Tanpa dukungan multibahasa, Anda mungkin akan melihat tanda tanya, tanda kotak, atau karakter lain selain dari Surat Lampung.Surat LampungRupa huruf aksara Lampung rekaan Koninklijke Joh. Enschedé (1907)Jenis aksara Abugida BahasaRumpun bahasa Lampung, Melayu[1]Aksara terkaitSilsilahMenurut hipotesis hubungan antara abjad Aramea dengan Brahmi, maka silsilahnya sebagai berikut: Abjad Proto-Sinai Abjad Fenis...
Ini adalah nama Tionghoa-Indonesia, marganya adalah Liem (林) Soedono SalimFoto portrait Soedono SalimNama asal林紹良LahirLiem Sioe Liong(1916-07-19)19 Juli 1916Fuqing, Republik TiongkokMeninggal10 Juni 2012(2012-06-10) (umur 95)SingapuraPekerjaanPengusahaDikenal atasPendiri Salim GroupSuami/istriLie Kim Nio (alias Lilani)AnakAlbert Salim Andree Halim Anthony Salim Mira Salim Liem Sioe Liong (Hanzi: 林紹良; Pinyin: lín shàoliáng; 19 Juli 1916 – 10 J...
Canadian politician Romeo SaganashSaganash in 2011Shadow Minister for International CooperationIn officeApril 19, 2012 – October 21, 2012LeaderTom MulcairPreceded byJinny SimsSucceeded byHélène LaverdièreShadow Minister for Natural ResourcesIn officeMay 26, 2011 – September 30, 2011LeaderJack LaytonNycole TurmelPreceded byDenis CoderreSucceeded byClaude GravelleMember of Parliamentfor Abitibi—Baie-James—Nunavik—EeyouIn officeMay 2, 2011 – September 11...
KRI Teluk Ratai (509) di Jakarta pada 12 Agustus 2019 Tentang kelas Nama:kelas Teluk LangsaPembangun:Chicago Bridge and Iron Co.Charleston Naval ShipyardAmerican Bridge CompanyDravo CorporationOperator: Angkatan Laut IndonesiaDigantikan oleh:kelas Teluk SemangkaSubkelas:kelas LST-1kelas LST-542Dibangun:1942–1945Bertugas:1961–sekarangSelesai:10Dipensiunkan:10 Ciri-ciri umum Jenis Kapal Pendarat TankBerat benaman 1.625 ton panjang (1.651 t) ringan 4.080 ton panjang (4.145 t)...
Questa voce sull'argomento calciatori inglesi è solo un abbozzo. Contribuisci a migliorarla secondo le convenzioni di Wikipedia. Segui i suggerimenti del progetto di riferimento. Walter DaffernNazionalità Inghilterra Calcio RuoloCentrocampista CarrieraSquadre di club1 1908-1909 Royal Engineers? (?) Nazionale 1908 Regno Unito0[1] (0) Palmarès Olimpiadi OroLondra 1908 1 I due numeri indicano le presenze e le reti segnate, per le sole partite di campionato.Il sim...
Jan Brueghel der Ältere mit seiner Frau und zwei Kindern, 1613–15 (Gemälde von Peter Paul Rubens, heute in der Courtauld Gallery London) Jan Brueghel der Ältere [ˈbɾøːɣəl] (auch: Bruegel oder Breughel; * 1568 in Brüssel; † 13. Januar 1625 in Antwerpen, Spanische Niederlande), auch genannt Samtbrueghel (franz.: Brueghel de Velours), Blumenbrueghel oder Paradies-Brueghel, war ein bedeutender flämischer Maler zwischen Spätmanierismus und Barock aus der Maler-Dynastie Br...
FC Politehnica IașiCalcio Segni distintiviUniformi di gara Casa Trasferta Terza divisa Colori sociali Bianco, azzurro Dati societariCittàIași Nazione Romania ConfederazioneUEFA Federazione FRF CampionatoLiga I Fondazione2010 Proprietario Adrian Ambrosie Presidente Ciprian Paraschiv Allenatore Tony StadioEmil Alexandrescu(11 500 posti) Sito webhttps://www.politehnicaiasi.ro PalmarèsSi invita a seguire il modello di voce Il Fotbal Club Politehnica Iași è una società calcistica ...