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NMODEM is a file transfer protocol developed by L.B. Neal in 1990. NMODEM is essentially a version of XMODEM-CRC using larger 2048 byte blocks, as opposed to XMODEM's 128 byte blocks. NMODEM was implemented as a separate program, written in Turbo Pascal 5.0 for the IBM PC compatible family of computers. The block size was chosen to match the common cluster size of the MS-DOS FAT file system on contemporary hard drives, making buffering data for writing simpler.


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