Look up: XMODEM

1. Xmodem
   A protocol for transferring files during direct dial-up communications. Developed by Ward Christensen in 1977, Xmodem does error checking to ensure that information is not lost or corrupted during transfer of 128 byte blocks. Since its development it has
   Found on http://www.youngco.com/young2.asp?ID=4&T
   
   
2. XMODEM
   (communications) Ward Christensen's file transfer protocol, probably the most widely available protocol used for file transfer over serial lines (e.g. between modems). XMODEM uses 128-byte packets with error detection, allowing the receiver to request retransmission of a corrupted packet. XModem is...
   Found on http://foldoc.org/XMODEM
   
   
3. XModem
   Original modem protocol which enabled modems to communicate.
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
4. XMODEM
   `XMODEM` is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 `MODEM.ASM` terminal program. XMODEM became extremely popular in the early bulletin board system (BBS) market, largely because it was so simple to implement. It was also fairly inefficient, ...
   Found on http://en.wikipedia.org/wiki/XMODEM