Complete Protocol dictionary, glossary and reference
YMODEM is a protocol for file transfer used between modems. YMODEM was developed by Chuck Forsberg as the successor to XMODEM and MODEM7. 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.