Xmodem is a protocol for transferring files during direct dial-up communications. Developed by Ward Christensen in 1977, Xmodem has basic error checking to ensure that information isn't lost or corrupted during transfer. The protocol works by sending blocks of data in 128-byte blocks from PC to PC. Xmodem has undergone a couple of enhancements: Xmodem CRC uses a more reliable error-correction scheme, and Xmodem 1K allows larger files to be sent greater distances with the same reliable error checking. Information is transmitted in (1KB) 1,024-byte blocks as opposed to the former Xmodem 128-byte blocks.
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