About: XMODEM

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XMODEM is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program. It allowed users to transmit files between their computers when both sides used MODEM. Keith Petersen made a minor update to always turn on "quiet mode", and called the result XMODEM. Chuck Forsberg collected a number of common modifications into his YMODEM protocol, but poor implementation led to a further fracturing before they were re-unified by his later ZMODEM protocol. ZMODEM became very popular, but never completely replaced XMODEM in the BBS market.

Attributes	Values
rdf:type	software yago:WikicatBBSFileTransferProtocols yago:WikicatNetworkProtocols yago:Abstraction100002137 yago:Communication100033020 yago:Direction106786629 yago:FileTransferProtocol106665370 yago:Message106598915 yago:Protocol106665108 yago:Rule106652242 yago:WikicatFileTransferProtocols
rdfs:label	XMODEM (ca) XMODEM (de) Xmodem (es) Xmodem (fr) XMODEM (ko) XMODEM (ja) XMODEM (pl) XMODEM (en)
rdfs:comment	XMODEM o X-MODEM, és un protocol per a la transferència de fitxers desenvolupat per Ward Christensen i va ser el més popular de la xarxa telefònica commutada, és a dir, entre mòdems. XMODEM utilitza paquets de 128 bytes amb detecció d'errors, permetent al receptor sol·licitar la retransmissió de paquets corrompudes. XMODEM és prou lent, però segur. (ca) Das XMODEM (gelegentlich auch X-MODEM) ist ein einfaches Sende-und-warte-ARQ-Protokoll mit einer festen Paketlänge, welches eine gesicherte Datenübertragung regelt. Es wurde 1977 von dem IBM-Vertriebstechniker entwickelt und ist Public domain. XMODEM war das erste weitverbreitete Datenübertragungsprotokoll und trug wesentlich zur Ausbreitung der Mailboxen bei. Christensen selbst richtete 1978 mit dem CBBS (Computerized Bulletin Board System) die erste Mailbox zum Austausch von Nachrichten ein. Es wird üblicherweise auf dem seriellen Protokoll implementiert. (de) Xmodem est un protocole de transfert de fichier développé par et fut le plus populaire pour le réseau téléphonique commuté, c'est-à-dire entre modems. Xmodem utilise des paquets de 128 octets avec détection d’erreur, permettant au receveur de demander la retransmission du paquet corrompu. Xmodem est assez lent mais fiable. Xmodem, comme la plupart des protocoles de transfert de fichier, découpe les données à envoyer en une série de paquets qui sont envoyés au destinataire, enrichie d'informations additionnelles permettant au destinataire de déterminer si le paquet a été correctement reçu. (fr) XMODEM（えっくすもでむ）は、バイナリ転送プロトコルの一種である。128バイト単位でを行う。開発者の Ward Christensen がパブリックドメイン扱いで仕様を公開したため、パソコン通信で広く使われた。XMODEMを元に考案されたプロトコルも多く、またXMODEM自身にもいくつかのタイプがある。 (ja) XMODEM – protokół dzielący dane na bloki, z których każdy zawiera: numer sekwencyjny bloku, 128-bajtowe dane i 4-bajtową sumę kontrolną, która jest wyliczana z bloku danych. Synchronizacja jest zachowana poprzez sprawdzenie numeru sekwencyjnego aktualnie przesłanego bloku oraz wyliczenie sumy kontrolnej danych i porównanie jej z przesłaną sumą kontrolną. W przypadku błędu wysyłane jest żądanie o ponowne wysłanie bloku. (pl) XMODEM es el protocolo de transferencia de archivos más antiguo, desarrollado en 1977 por a modo de apaño rápido para utilizarse con su programa de terminal MODEM.ASM, y posteriormente cedido para su uso público, por lo cual este protocolo también es conocido como “protocolo Christensen”. Se trata de un protocolo de transferencia muy sencillo de implementar que gracias a ello alcanzó gran popularidad. Actualmente, la mayoría de los módems soportan aun este protocolo. (es) XMODEM is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program. It allowed users to transmit files between their computers when both sides used MODEM. Keith Petersen made a minor update to always turn on "quiet mode", and called the result XMODEM. Chuck Forsberg collected a number of common modifications into his YMODEM protocol, but poor implementation led to a further fracturing before they were re-unified by his later ZMODEM protocol. ZMODEM became very popular, but never completely replaced XMODEM in the BBS market. (en) XMODEM은 (Ward Christensen)이 1977년 자신의 MODEM.ASM 단말 에뮬레이터에 사용할 목적으로 빠른 해킹으로 개발된 단순 파일 전송 프로토콜이다. 사용자들은 양측이 MODEM을 사용하는 경우 컴퓨터 간 파일을 전송할 수 있게 허용하였다. 케이스 피터슨(Keith Petersen)은 "조용한 모드"(quiet mode)를 무조건 활성화시키는 사소한 업데이트를 진행하였는데 그 결과 XMODEM이 탄생하게 되었다. XMODEM은 초기 전자 게시판(BBS) 시장에서 큰 인기를 끌었는데, 이는 대체적으로 구현이 매우 단순하였기 때문이었다. 한편으로는 상당히 비효율적이어서 모뎀 속도가 증가될 때 이러한 문제로 인해 성능을 개선하거나 프로토콜의 다른 문제를 해결하기 위해 수많은 XMODEM 수정판이 개발되었다. 크리스텐슨은 자신의 오리지널 XMODEM이 "컴퓨터 역사상 가장 많이 수정된 하나의 프로그램"이 될 것이라 생각하였다. Chuck Forsberg는 자신의 프로토콜에 수많은 수정사항을 집약했지만 구현을 잘 하지 못하여 나중에 나올 자신의 Z모뎀 프로토콜에 재병합되기 전까지는 추가적인 균열이 발생되었다. (ko)
dcterms:subject	Computer-related introductions in 1977 BBS file transfer protocols
Wikipage page ID	1117757 (xsd:integer)
Wikipage revision ID	1119007394 (xsd:integer)
Link from a Wikipage to another Wikipage	Modem Half duplex Computer-related introductions in 1977 Cyclic redundancy check .arc Chuck Forsberg Modulo operation Control character MS-DOS Sliding window ZMODEM Full duplex Payload (computing) Protocol spoofing 8.3 filename Bulletin board system C0 and C1 control codes CP/M Tom Jennings Data compression Ward Christensen File Allocation Table Floppy disk Osborne 1 Checksum Flow control (data) Hacker (hobbyist) Telebit Acoustic coupler Jerry Pournelle Kermit (protocol) BLAST (protocol) BBS file transfer protocols FidoNet File transfer End-of-transmission character Terminal program IBM PC compatible Operating system YMODEM SEAlink Timestamp X.25 Acknowledge character XON/XOFF PC Pursuit Packet (information technology) Channel efficiency Hard drive Plain-old telephone service Negative acknowledge character
Link from a Wikipage to an external page	http://techheap.packetizer.com/communication/modems/xmodem.html http://textfiles.com/programming/ymodem.txt https://github.com/cpeterso/sealink/blob/master/sealink.txt https://web.archive.org/web/20121110151951/http:/www.techfest.com/hardware/modem/xymodem.htm http://ftsc.org/docs/fts-0001.016 http://pauillac.inria.fr/~doligez/zmodem/ymodem.txt http://techheap.packetizer.com/communication/modems/xmodem-ymodem_reference.html http://www.vintagecomputer.net/fjkraan/comp/mirror/z80cpu.eu/archive/rlee/L/LOOSECPM/224/MODEM.ASM http://wiki.synchro.net/ref:xmodem http://www.adontec.com/xmodem_e.htm
sameAs	XMODEM XMODEM XMODEM XMODEM XMODEM XMODEM XMODEM XMODEM

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