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XMODEM is a simple and popular protocol for sending files between computers using modems. It was developed by Ward Christensen in 1977 and has many variations and extensions to improve performance and reliability.
XMODEM is a file transfer protocol which enables users to transmit files between different computers. History : XMODEM was developed by Ward Christensen in 1977 and since then the method of sharing files has changed. It became extremely popular in the early bulletin board system (BBS) market because of its simple implementation.
Learn how XModem, a simple half-duplex communication protocol, works with CRC data checking. See the packet format, definitions, synchronization, and error handling of XModem.
XMODEM refers to the file transfer etiquette introduced by Ward Christensen's 1977 MODEM.ASM program.The name XMODEM comes from Keith Petersen's XMODEM.ASM program, an adaptation of MODEM.ASM for Remote CP/M (RCPM) systems.It's also called the MODEM or MODEM2 protocol. Some who are unaware of MODEM7's unusual batch file mode call it MODEM7.
Xmodem 和 Ymodem 是串口通信中广泛用到的异步文件传输协议。这个协议包括了文件的识别、传送的起止时间、错误的判断与纠正等内容。Xmodem、Ymodem 和 Zmodem 协议是最常用的三种通信协议。详情可以参考ymodem.txt。本文只介绍 Xmodem 和 Ymodem 协议，Zmodem 协议后续添加。
XMODEM file transfer protocol¶. This is a literal implementation of XMODEM.TXT, XMODEM1K.TXT and XMODMCRC.TXT, support for YMODEM and ZMODEM is pending.YMODEM should be fairly easy to implement as it is a hack on top of the XMODEM protocol using sequence bytes 0x00 for sending file names (and some meta data).
The author shares his experience of using XMODEM, a 45-year old protocol for file transfers, to boot a system over a serial link. He explains the challenges, solutions and lessons learned from this project, and provides some code snippets and links.
XMODEM refers to the file transfer etiquette introduced by Ward Christensen's 1977 MODEM.ASM program. The name XMODEM comes from Keith Petersen's XMODEM.ASM program, an adaptation of MODEM.ASM for Remote CP/M (RCPM) systems. It's also called the MODEM or MODEM2 protocol. Some who are unaware of MODEM7's unusual batch file mode call it MODEM7.
This site is a chipset and modem reference for people like me with loads of old modems in boxes on shelves. Like my modem collection, it is dusty, out-of-date, and only occasionally useful.
Xmodem provides a way to send the data as block, each block is CRC'd and if it is found to be bad, it gets "nak"d and is resent in a future slot. Kermit was developed later, and came up witha different way of passing binary data across a seven bit ASCII async line.