xmodem help needed

[Rob Coutch]

REQUEST FOR HELP:

I'm looking for the complete explanation/description of the
xmodem protocol for data transfer.
(checksum and crc modes)
If anyone with this data or info on how to obtain this data
would please contact me with this information, I would be
very grateful.
				Thanks in advance!
BTW: this is for a possible C program.

Rob Coutch 
rec at advdev.cambridge.ncr.com