{"id":96211,"date":"2020-10-09T07:42:43","date_gmt":"2020-10-09T05:42:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/pochemu-v-ebcdic-bukvy-idut-ne-podryad"},"modified":"2020-10-09T07:42:43","modified_gmt":"2020-10-09T05:42:43","slug":"pochemu-v-ebcdic-bukvy-idut-ne-podryad","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/pochemu-v-ebcdic-bukvy-idut-ne-podryad","title":{"rendered":"Mi\u00e9rt nem sorban k\u00f6vetkeznek a bet\u0171k az EBCDIC-ben?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Az ASCII szabv\u00e1nyt 1963-ban fogadt\u00e1k el, \u00e9s ma val\u00f3sz\u00edn\u0171leg senki sem haszn\u00e1lja a k\u00f3dol\u00e1st, amelynek els\u0151 128 karaktere elt\u00e9rne az ASCII-t\u00f3l. Mindazon\u00e1ltal a m\u00falt sz\u00e1zad v\u00e9g\u00e9ig akt\u00edvan haszn\u00e1lt\u00e1k az EBCDIC-et \u2013 az IBM mainframe-ek \u00e9s azok szovjet kl\u00f3njainak, az ES EVEM-nek a szabv\u00e1nyos k\u00f3dol\u00e1s\u00e1t. Az EBCDIC tov\u00e1bbra is az alap\u00e9rtelmezett k\u00f3dol\u00e1s a z\/OS sz\u00e1m\u00e1ra \u2013 az IBM Z modern mainframe-ek szabv\u00e1nyos oper\u00e1ci\u00f3s rendszere.<\/p>\n<p>Amit az EBCDIC-re pillantva azonnal \u00e9szre lehet venni \u2013 hogy a bet\u0171k nem sorban k\u00f6vetik egym\u00e1st: a <code>I<\/code> \u00e9s <code>J<\/code> \u00e9s a <code>R<\/code> \u00e9s <code>S<\/code> k\u00f6z\u00f6tt \u00fcres poz\u00edci\u00f3k maradtak (az ES EVEM-en ezek k\u00f6z\u00e9 <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%94%D0%9A%D0%9E%D0%98\">osztott\u00e1k el<\/a><\/noindex> a cirill karaktereket). Ki gondolt volna arra, hogy a bet\u0171ket egyenl\u0151tlen t\u00e1vols\u00e1gokkal k\u00f3dolj\u00e1k egym\u00e1s k\u00f6z\u00f6tt?<\/p>\n<p><img decoding=\"async\" alt=\"Mi\u00e9rt nem sorban k\u00f6vetkeznek a bet\u0171k az EBCDIC-ben?\" src=\"\/wp-content\/uploads\/2020\/10\/22c1cf32906b9b2f49bef5d6aa4dba77.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>A n\u00e9v, az EBCDIC (&#171;Extended BCDIC&#187;), arra utal, hogy ez a k\u00f3dol\u00e1s \u2013 ellent\u00e9tben az ASCII-val \u2013 nem a semmib\u0151l, hanem a BCDIC hatbite-es k\u00f3dol\u00e1s alapj\u00e1n k\u00e9sz\u00fclt, amelyet <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/BCD_(character_encoding)#IBM_704_BCD_code\">IBM 704<\/a><\/noindex> (1954):<\/p>\n<p><img decoding=\"async\" alt=\"Mi\u00e9rt nem sorban k\u00f6vetkeznek a bet\u0171k az EBCDIC-ben?\" src=\"\/wp-content\/uploads\/2020\/10\/e7f6ef41a4b3000d8f1779fd86f5d0a4.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>K\u00f6zvetlen visszafel\u00e9 kompatibilit\u00e1s nincs: a BCDIC k\u00e9nyelmes jellemz\u0151je, amelyet az EBCDIC-re val\u00f3 \u00e1t\u00e1ll\u00e1s sor\u00e1n elvesz\u00edtettek, az volt, hogy a sz\u00e1mokhoz <code>0<\/code>\u2014<code>9<\/code> a 0-9 k\u00f3dok tartoznak. Mindazon\u00e1ltal m\u00e1r a BCDIC-ben is voltak h\u00e9zagos poz\u00edci\u00f3k, a <code>I<\/code> \u00e9s <code>J<\/code> \u00e9s nyolc k\u00f3d a <code>R<\/code> \u00e9s <code>S<\/code> k\u00f6z\u00f6tt. Honnan sz\u00e1rmaznak ezek?<\/p>\n<p>Az (E)BCDIC t\u00f6rt\u00e9nete egyid\u0151ben kezd\u0151dik az IBM t\u00f6rt\u00e9net\u00e9vel \u2013 j\u00f3val az elektronikus sz\u00e1m\u00edt\u00f3g\u00e9pek el\u0151tt. Az IBM n\u00e9gy v\u00e1llalat f\u00fazi\u00f3j\u00e1val j\u00f6tt l\u00e9tre, amelyek k\u00f6z\u00fcl a legtechnol\u00f3giailag fejlettebb a &#171;Tabulating Machine Company&#187; volt, amelyet 1896-ban alap\u00edtott Herman Hollerith \u2013 a feltal\u00e1l\u00f3ja <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%A2%D0%B0%D0%B1%D1%83%D0%BB%D1%8F%D1%82%D0%BE%D1%80\">tabul\u00e1tor<\/a><\/noindex>. Az els\u0151 tabul\u00e1torok egyszer\u0171en sz\u00e1molt\u00e1k a perfor\u00e1lt k\u00e1rty\u00e1k sz\u00e1m\u00e1t, amelyek egy adott helyen perfor\u00e1ltak; de 1905-ben Hollerith megkezdte a <em>t\u00edzalap\u00fa<\/em> tabul\u00e1torok gy\u00e1rt\u00e1s\u00e1t. Minden k\u00e1rtya a t\u00edzalap\u00fa tabul\u00e1torhoz v\u00e1ltoz\u00f3 hossz\u00fas\u00e1g\u00fa mez\u0151kb\u0151l \u00e1llt, \u00e9s a mez\u0151kben hagyom\u00e1nyos t\u00edzes sz\u00e1mrendszerben r\u00f6gz\u00edtett sz\u00e1mok \u00f6sszeadt\u00e1k az eg\u00e9sz pakliban. A k\u00e1rtya mez\u0151ire val\u00f3 feloszt\u00e1st a tabul\u00e1tor kapcsol\u00f3pultj\u00e1ra vezetett dr\u00f3tok \u00f6sszekapcsol\u00e1s\u00e1val hat\u00e1rozt\u00e1k meg. P\u00e9ld\u00e1ul ezen a perfor\u00e1lt k\u00e1rty\u00e1n Hollerith <noindex><a rel=\"nofollow\" href=\"https:\/\/www.loc.gov\/resource\/mcc.023\/?sp=8\">meg\u0151rizte<\/a><\/noindex> a Kongresszus K\u00f6nyvt\u00e1r\u00e1ban, nyilv\u00e1nval\u00f3an ki van \u00fctve a 23456789012345678 sz\u00e1m, ismeretlen m\u00f3don osztva mez\u0151kre:<\/p>\n<p><img decoding=\"async\" alt=\"Mi\u00e9rt nem sorban k\u00f6vetkeznek a bet\u0171k az EBCDIC-ben?\" src=\"\/wp-content\/uploads\/2020\/10\/d6f3ca57fad235f067efe6ac2ce3427d.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>A legfigyelmesebbek \u00e9szrevehett\u00e9k, hogy a Hollerith k\u00e1rty\u00e1n 12 sor van a lyukak sz\u00e1m\u00e1ra, b\u00e1r a sz\u00e1mokhoz elegend\u0151 lenne t\u00edz; m\u00edg a BCDIC-ben minden \u00e9rt\u00e9k k\u00e9t legmagasabb bitje csak 12 k\u00f3dot haszn\u00e1l a 16-b\u00f3l.<\/p>\n<p>Term\u00e9szetesen nem v\u00e9letlen egybees\u00e9s. Hollerith kezdetben a &#171;speci\u00e1lis jel\u00f6l\u00e9sek&#187; sz\u00e1m\u00e1ra sz\u00e1nt tov\u00e1bbi sorokat, amelyek nem \u00f6sszegez\u0151dtek, hanem egyszer\u0171en megsz\u00e1ml\u00e1lt\u00e1k \u0151ket \u2013 mint a legels\u0151 tabul\u00e1torokban. (Ma &#171;bitmez\u0151knek&#187; nevezn\u00e9nk \u0151ket.) R\u00e1ad\u00e1sul a &#171;speci\u00e1lis jel\u00f6l\u00e9sek&#187; k\u00f6z\u00f6tt lehetett csoportindic\u00e1torokat megadni: ha a tabul\u00e1l\u00e1s sor\u00e1n nemcsak v\u00e9gs\u0151 \u00f6sszegekre volt sz\u00fcks\u00e9g, hanem k\u00f6ztesekre is, a tabul\u00e1tor meg\u00e1llt, amikor \u00e9szlelte b\u00e1rmelyik csoportindic\u00e1tor v\u00e1ltoz\u00e1s\u00e1t, \u00e9s az oper\u00e1tornak \u00e1t kellett \u00edrnia a k\u00f6ztes \u00f6sszegeket a digit\u00e1lis kijelz\u0151kr\u0151l pap\u00edrra, null\u00e1zni a kijelz\u0151t \u00e9s folytatni a tabul\u00e1l\u00e1st. P\u00e9ld\u00e1ul a k\u00f6nyvel\u00e9si egyenlegek kisz\u00e1m\u00edt\u00e1s\u00e1n\u00e1l egy k\u00e1rtyacsoport egy adott d\u00e1tumhoz vagy egyetlen \u00fczleti partnerhez tartozhatott.<\/p>\n<p>1920-ra, amikor Hollerith m\u00e1r nyugd\u00edjba vonult, elterjedtek a &#171;nyomtat\u00f3 tabul\u00e1torok&#187;, amelyek csatlakoztak a telexhez, \u00e9s k\u00e9pesek voltak \u00f6n\u00e1ll\u00f3an nyomtatni a k\u00f6ztes \u00f6sszegeket, nem ig\u00e9nyeltek oper\u00e1tori beavatkoz\u00e1st. A komplexit\u00e1s most abban rejlett, hogy meghat\u00e1rozzuk, hogy az egyes nyomtatott sz\u00e1mok mire vonatkoznak. 1931-ben az IBM \u00fagy d\u00f6nt\u00f6tt, hogy &#171;speci\u00e1lis jel\u00f6l\u00e9sekkel&#187; jel\u00f6li a bet\u0171ket: a 12. sor jel\u00f6l\u00e9se egy bet\u0171t jelentett. <code>A<\/code> t\u00f3l <code>I<\/code>, a 11. sorban egy m\u00e1sikat <code>J<\/code> t\u00f3l <code>R<\/code>, a nulladik sorban pedig egy harmadikat <code>S<\/code> t\u00f3l <code>Z<\/code>. Az \u00faj &#171;bet\u0171s tabul\u00e1tor&#187; k\u00e9pes volt minden k\u00e1rtyacsoport nev\u00e9t nyomtatni a k\u00f6ztes \u00f6sszegekkel egy\u00fctt; k\u00f6zben a nem \u00e1t\u00fct\u00f6tt oszlop sz\u00f3k\u00f6zz\u00e9 alakult a karakterek k\u00f6z\u00f6tt. Vegye \u00e9szre, hogy <code>S<\/code> a 0+2 lyukak kombin\u00e1ci\u00f3j\u00e1val van jel\u00f6lve, m\u00edg a 0+1 kombin\u00e1ci\u00f3t eredetileg nem haszn\u00e1lt\u00e1k, f\u00e9lve att\u00f3l, hogy k\u00e9t szomsz\u00e9dos lyuk egy oszlopban mechanikai probl\u00e9m\u00e1kat okozhat a leolvasz\u00f3ban.<\/p>\n<p><img decoding=\"async\" alt=\"Mi\u00e9rt nem sorban k\u00f6vetkeznek a bet\u0171k az EBCDIC-ben?\" src=\"\/wp-content\/uploads\/2020\/10\/288ca9583d25e2fce14145992ef0a511.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Most a BCDIC t\u00e1bl\u00e1zatra egy kicsit m\u00e1s szemsz\u00f6gb\u0151l is r\u00e1n\u00e9zhet\u00fcnk:<\/p>\n<p><img decoding=\"async\" alt=\"Mi\u00e9rt nem sorban k\u00f6vetkeznek a bet\u0171k az EBCDIC-ben?\" src=\"\/wp-content\/uploads\/2020\/10\/12b8e92a82ad91076ad8d66ae70cecb2.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>A kiv\u00e9tel\u00e9vel, hogy a 0 \u00e9s a sz\u00f3k\u00f6z felcser\u00e9l\u0151dtek, a magasabb k\u00e9t bit a &#171;speci\u00e1lis jel\u00f6l\u00e9st&#187; hat\u00e1rozza meg, amelyet 1931 \u00f3ta \u00fct\u00f6ttek a perfor\u00e1lt k\u00e1rty\u00e1n a megfelel\u0151 jelhez; m\u00edg a legals\u00f3 n\u00e9gy bit a sz\u00e1mot hat\u00e1rozz\u00e1k meg, amelyet a k\u00e1rtya f\u0151 r\u00e9sz\u00e9ben \u00fct\u00f6ttek. A karakterek t\u00e1mogat\u00e1sa <code>&amp; - \/<\/code> 1930-as \u00e9vekben az IBM tabul\u00e1torokba ker\u00fclt, \u00e9s ezen karakterek BCDIC k\u00f3dol\u00e1sa megfelel az \u00e1ltaluk az \u00fct\u0151d\u00e9sekhez kapcsol\u00f3d\u00f3 lyukak kombin\u00e1ci\u00f3inak. Amikor m\u00e9g t\u00f6bb karakter t\u00e1mogat\u00e1s\u00e1ra volt sz\u00fcks\u00e9g, egy tov\u00e1bbi \u201ek\u00fcl\u00f6nleges jel\u00f6l\u00e9st\u201d kezdtek el \u00fctni a 8-as sorba - \u00edgy egy oszlopban ak\u00e1r h\u00e1rom lyuk is lehetett. Ez a perfor\u00e1lt k\u00e1rtya form\u00e1tum gyakorlatilag v\u00e1ltozatlan maradt a sz\u00e1zad v\u00e9g\u00e9ig. A Szovjetuni\u00f3ban megmaradtak az IBM latin bet\u0171s \u00e9s \u00edr\u00e1sjelez\u00e9si k\u00f3dol\u00e1sai, m\u00edg a cirill bet\u0171k eset\u00e9ben t\u00f6bb \u201ek\u00fcl\u00f6nleges jel\u00f6l\u00e9st\u201d \u00fct\u00f6ttek a 12-es, 11-es \u00e9s 0-\u00e1s sorokban - nem korl\u00e1tozva magukat h\u00e1rom lyukra egy oszlopban.<\/p>\n<p>Amikor az IBM 704 sz\u00e1m\u00edt\u00f3g\u00e9p\u00e9t megalkott\u00e1k, a karakterek k\u00f3dol\u00e1s\u00e1nak kidolgoz\u00e1s\u00e1val sok\u00e1ig nem foglalkoztak: a perfok\u00e1rty\u00e1kon m\u00e1r haszn\u00e1lt k\u00f3dol\u00e1st haszn\u00e1lt\u00e1k, \u00e9s csup\u00e1n a 0-t \u201ea hely\u00e9re tett\u00e9k\u201d. 1964-ben, a BCDIC-r\u0151l EBCDIC-re val\u00f3 \u00e1tt\u00e9r\u00e9skor a karakterek als\u00f3 n\u00e9gy bitj\u00e9t v\u00e1ltozatlanul hagyt\u00e1k, noha a fels\u0151 biteket kiss\u00e9 \u00e1tkevert\u00e9k. \u00cdgy a perfor\u00e1lt k\u00e1rty\u00e1k form\u00e1tuma, amelyet Hollerith az el\u0151z\u0151 \u00e9vsz\u00e1zad elej\u00e9n v\u00e1lasztott, hat\u00e1ssal volt az \u00f6sszes IBM sz\u00e1m\u00edt\u00f3g\u00e9p architekt\u00far\u00e1j\u00e1ra, bele\u00e9rtve az IBM Z-t is.<\/p>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/521164\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442 ASCII \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442 \u0432 1963, \u0438 \u0441\u0435\u0439\u0447\u0430\u0441 \u0432\u0440\u044f\u0434 \u043b\u0438 \u043a\u0442\u043e-\u043d\u0438\u0431\u0443\u0434\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u043a\u0443, \u043f\u0435\u0440\u0432\u044b\u0435 128 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043e\u0442\u043b\u0438\u0447\u0430\u043b\u0438\u0441\u044c \u0431\u044b \u043e\u0442 ASCII. \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u0434\u043e \u043a\u043e\u043d\u0446\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u0433\u043e \u0432\u0435\u043a\u0430 \u0430\u043a\u0442\u0438\u0432\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0430\u0441\u044c EBCDIC \u2014 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u0430\u044f \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u043a\u0430 \u0434\u043b\u044f \u043c\u0435\u0439\u043d\u0444\u0440\u0435\u0439\u043c\u043e\u0432 IBM \u0438 \u0438\u0445 \u0441\u043e\u0432\u0435\u0442\u0441\u043a\u0438\u0445 \u043a\u043b\u043e\u043d\u043e\u0432 \u0415\u0421 \u042d\u0412\u041c. EBCDIC \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u043a\u043e\u0439 \u0432 z\/OS \u2014 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u041e\u0421 \u0434\u043b\u044f \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u043c\u0435\u0439\u043d\u0444\u0440\u0435\u0439\u043c\u043e\u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":96212,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-96211","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442 ASCII \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442 \u0432 1963, \u0438 \u0441\u0435\u0439\u0447\u0430\u0441 \u0432\u0440\u044f\u0434 \u043b\u0438 \u043a\u0442\u043e-\u043d\u0438\u0431\u0443\u0434\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u043a\u0443, \u043f\u0435\u0440\u0432\u044b\u0435 128 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043e\u0442\u043b\u0438\u0447\u0430\u043b\u0438\u0441\u044c \u0431\u044b \u043e\u0442 ASCII.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/pochemu-v-ebcdic-bukvy-idut-ne-podryad\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"hu_HU\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u041f\u043e\u0447\u0435\u043c\u0443 \u0432 EBCDIC \u0431\u0443\u043a\u0432\u044b \u0438\u0434\u0443\u0442 \u043d\u0435 \u043f\u043e\u0434\u0440\u044f\u0434? 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