What is ymodem?

 What is Ymodem? File Transfer Protocol 1024-byte Packet Size
Ymodem File Transfer Protocol

     Protocol which transfers more than one files at a time. It can use both 1024 byte blocks and 128 byte blocks
     An asynchronous communications protocol designed by Chuck Forsberg that extends Xmodem by increasing the transfer block size and by supporting batch files transfers. This enables you to specify a list of files and send them all at one time. With Xmodem, you can send only one at a time.
     A file transfer protocol based on CRC Xmodem. Ymodem has a 1024-byte packet size. Ymodem can transfer more than one file at a time. As it transfers a file along with some information about that file (including its length, and the name of the file). Its similar to Xmodem / CRC, except that Ymodem can transfer more than one file at a time. It will use CRC-16 if possible, or else it will use a 1 byte checksum. It will use both 1024 byte blocks and 128 byte blocks.

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 What is Ymodem? File Transfer Protocol 1024-byte Packet Size