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NMODEM

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This is an old revision of this page, as edited by 101.164.1.138 (talk) at 04:11, 28 December 2014 (be more specific than "IBM", which could mean mainframes or AS/400 or AIX, when what the article means is IBM PC compatibles). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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. This made buffering data for writing simpler.