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XMODEM

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.

Higher throughput, Packet structure & Batch transfers

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Developer
Ward Christensen
Hardware
modems
Influenced
YMODEM, many others
Introduction
1977; 49 years ago (1977)
Purpose
file transfer protocol

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Overview

Packet structure

Transfer details

  • ACK Acknowledge character
  • NAK Negative acknowledge character

Problems

Batch transfers

XMODEM-CRC

Higher throughput

Advanced semantic analysis

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Map overview Semantic statistics

XMODEM

Nodes60
Edges59
Triples166
Avg. degree1.97
Density0.033333
Components1

How this topic connects Entity context

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XMODEM

Top relations

related to Bibliography · 21
XMODEM → August, Boswell, Bush, Christensen, Chuck, CRC XMODEM, FidoNet Technical Standard FTS-0001, Forsberg, January, June, March, Peter, Randy, Retrieved, SEALINK File Transfer Protocol, September, Technical, Ward, WXMODEM File Transfer Protocols, XMODEM Protocol Overview
related to WXModem · 16
XMODEM → Additionally, CRC, DLE, Finally, In, One, PC Pursuit, Peter Boswell, These, Windowed Xmodem, WXmodem, XMODEM-CRC, XOFFandSYN, XON, XON/XOFF, XORing
related to Minor problems · 13
XMODEM → ACK, CAN, CP/M, EOF, EOT, For, However, Likewise, MS-DOS, NAK, Notably, SOH, These
related to External links · 12
XMODEM → ASM, Chuck Forsberg, HTML, June, MODEM, October, Ward Christensen, WXMODEM File Transfer Protocols, XMODEM-CRC, XMODEM/32k, XMODEM/64k, YMODEM Protocol Reference
related to XMODEM-CRC · 11
XMODEM → C's, CRC, CRCs, If, John Byrns, NAK, Statistically, The, This, To, XMODEM-CRC
related to TeLink · 10
XMODEM → FidoNet, MODEM7, MODEM7's, SOH, SYN, TeLink, The, This, Tom Jennings, Whereas
related to Higher throughput · 9
XMODEM → ACK, As, Assuming, At, For, In, NAK, Since, The
related to Packet structure · 9
XMODEM → Block, CP/M, EOT, In, Since, SOH, SUB, The, This
related to SEAlink · 9
XMODEM → ACKs, FidoNet, It, One, SEAdog, SEAlink, TeLink, The, WXmodem
related to Major problems · 8
XMODEM → Additionally, As, Due, However, Many, Most, Ward Christensen, XMODEM's

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Important terminology

packet transfer protocol receiver file would number packets data sent nak sender character could ymodem block xmodem-crc used original sealink

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
XMODEMDeveloperWard Christensen1.00infobox
XMODEMHardwaremodems1.00infobox
XMODEMInfluencedYMODEM, many others1.00infobox
XMODEMIntroduction1977; 49 years ago (1977)1.00infobox
XMODEMPurposefile transfer protocol1.00infobox
XMODEMis asimple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program0.90text
XMODEMrelated to Batch transfersAnother0.60section
XMODEMrelated to Batch transfersTypically0.60section
XMODEMrelated to Batch transfersThey0.60section
XMODEMrelated to Batch transfersIf0.60section
XMODEMrelated to Batch transfersFor0.60section
XMODEMrelated to Batch transfersThese0.60section

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