C-Modem
is a protocol driver developed by Lavio Pareschi (
Rio de Janeiro) 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 communication.
References
External links
C-Modem 1.1 program
C-Modem documentation
BBS file transfer protocols
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