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 undergone a couple of enhancements such as Xmodem CRC uses a more reliable error correction scheme, and Xmodem-1K transfers data by 1,024-byte blocks.

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