Ymodem

protocol for data transfer and error detection between two computers which are connected by a modem (Computers)

YMODEM is a protocol for file transfer used between modems. YMODEM was developed by Chuck Forsberg as the successor to XMODEM and MODEM7, and was first implemented in his CP/M YAM program. It was formally given the name "YMODEM" in 1985 by Ward Christensen.The original YMODEM was essentially the same as XMODEM except that it sent the file's name, size, and timestamp in a regular XMODEM block before actually transferring the file. Sending the file size solved XMODEM's problem of superfluous padding at the end of the file.Many programmers who implemented YMODEM refused to follow Christensen's standard or produced their own extensions to the protocol while continuing to use the "YMODEM" name. The result was a large number of mutually incompatible YMODEMs.
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YMODEM, protocol for data transfer and error detection between two computers which are connected by a modem (Computers)

YMODEM, protocol for data transfer and error detection between two computers which are connected by a modem (Computers)

A file transfer protocol used between modems. YMODEM was developed by Chuck Forsberg as the successor to XMODEM and was itself succeeded by ZMODEM. XMODEM used 128-byte packets, YMODEM can also use 1 kilobyte packets. Whereas YMODEM is a batch protocol, YMODEM-G is a non-stop version.
File sizes are included in the YMODEM header when sending both binary and text files. Thus files transferred via YMODEM should preserve their exact length. File modification times may also be present in the YMODEM header.
YModem can fall back to smaller packets when necessary but there is no backward compatibility with XModem's error detection.
[Chuck Forsberg, "XMODEM/YMODEM Protocol Reference"].
(1995-02-02)