C-MODEM
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C-Modem is a protocol driver developed by Lavio Pareschi (
Rio de Janeiro Rio de Janeiro, or simply Rio, is the capital of the Rio de Janeiro (state), state of Rio de Janeiro. It is the List of cities in Brazil by population, second-most-populous city in Brazil (after São Paulo) and the Largest cities in the America ...
) in 1989 that functions similarly to ZMODEM.


Features

C-Modem has a crash recovery feature. If a transmission is interrupted, the partially received file is saved with the extension .BAD. Upon reconnection, the transmission resumes. The protocol dynamically adjusts the size of data blocks between
cyclic redundancy checks A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to digital data. Blocks of data entering these systems get a short ''check value'' attached, based on ...
based on transmission speed and error rates. Block sizes can range from 32 to 4096 bytes. C-Modem also supports
full duplex A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow ...
communication.


References


External links


C-Modem 1.1 program

C-Modem documentation
BBS file transfer protocols {{software-stub