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XMODEM
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===NMODEM=== NMODEM is a [[file transfer]] protocol developed by L. B. Neal, who released it 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]] [[File Allocation Table|FAT]] file system on contemporary [[hard drive]]s, making buffering data for writing simpler.<ref>{{cite web |url=http://www.cpeterso.com/protocols/NMODM112.ARJ |title=NMODEM 1.12 program and source code |archive-url=https://web.archive.org/web/20110807213052/http://www.cpeterso.com/code/protocols/NMODM112.ARJ |archive-date=2011-08-07 |url-status=dead |access-date=2020-02-13 }}</ref><ref>{{cite web |url=http://www.cpeterso.com/protocols/NMODEM.TXT |title=NMODEM documentation |archive-url=https://web.archive.org/web/20160409012002/https://www.cpeterso.com/code/protocols/NMODEM.TXT |archive-date=2016-04-09 |url-status=dead |access-date=2020-02-13 }}</ref>
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