NMODEM

Encyclopedia : N : NM : NMO : NMODEM

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NMODEM is a file transfer protocol developed by L.B. Neal in 1990. NMODEM is a file transfer protocol written in Turbo Pascal 5.0 for the "IBM" family of computers.

This protocol sends data in 2048 byte blocks. The last block will be the size of the final bytes in the file, thus the original file size will be retained. Each block has an overhead of 6 bytes. 2048 was chosen for block size as it seems to be the optimum size for CPS and minimal inpact on efficiency if an error should occur. It also happens to be the normal size of a Hard Drive sector, 2 times a Floppy sector and 1/2 of an oversize Hard drive sector thus improving disk read/write efficiency.

NMODEM uses the 16-bit CRC error checking system for a very high reliability of successful transfer in rough conditions with minimal transfer overhead.

External links

• [NMODEM 1.12 program and source code]
• [NMODEM documentation]

 

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