Posted on May 17, 2011 at 14:01One of the main reasons for using Y-MODEM (or X-MODEM) is that it is supported by just about every terminal application or serial comms library around - so it's very rare that you actually need to implement it yourself!
However, if you really do need to implement it yourself, it's not difficult - see:
http://www.techheap.com/communication/modems/xmodem-ymodem_reference.html
for the protocol details
Also:
http://www.techheap.com/communication/modems/xmodem.html
And:
http://en.wikipedia.org/wiki/XMODEM
