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YMODEM is a file transfer protocol that was developed as an extension to the XMODEM protocol. It was created to address some of the limitations of XMODEM, such as slower transfer speeds and lack of error correction.

YMODEM supports faster transfer speeds by using a larger block size for data transmission. It also includes additional error checking and error correction mechanisms to ensure the integrity of the transferred data.

Some key features of YMODEM include:

  1. Batch transfers: YMODEM allows multiple files to be transferred in a single session, improving efficiency when transferring multiple files.
  2. Error detection and correction: YMODEM uses cyclic redundancy check (CRC) to detect errors in data transmission. In case of errors, it supports selective retransmission of specific blocks, reducing the need for retransmitting the entire file.
  3. File information: YMODEM can transmit file name and size information along with the file data, enabling proper identification and handling of the transferred files.
  4. Compatibility: YMODEM is backward compatible with XMODEM, which means it can be used with XMODEM-capable systems while providing additional features.

YMODEM has been widely used for file transfers in various applications, particularly in the early days of bulletin board systems (BBS) and modem communications. However, with the advancement of more robust and efficient protocols like ZMODEM and later protocols like FTP and SCP, the usage of YMODEM has become less common.

It’s important to note that YMODEM is a relatively older protocol, and its usage may be limited in modern environments where more advanced file transfer protocols are available.

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