View source for C-MODEM

{{Use mdy dates|date=September 2024}}{{Short description|File transfer and protocol driver}}
{{multiple issues|{{notability|date=April 2013}}
{{more footnotes|date=April 2013}}}}

'''C-Modem'''<ref>{{Citation|chapter=Recalling the Modem World|date=2022-04-19|doi=10.2307/j.ctv2c3k1ww.3|title=The Modem World|pages=1–28|jstor=j.ctv2c3k1ww.3|publisher=Yale University Press|last1=Driscoll|first1=Kevin|isbn=9780300248142}}</ref> is a protocol driver developed by Lavio Pareschi ([[Rio de Janeiro]]) in 1989 that functions similarly to [[ZMODEM]].{{citation needed|date=December 2021}} 

== Features ==
C-Modem has a [[Crash-only software|crash recovery]] feature. If a transmission is interrupted, the partially received file is saved with the extension <code>.BAD</code>. Upon reconnection, the transmission resumes.

The protocol dynamically adjusts the size of [[Block (data storage)|data blocks]] between [[Cyclic redundancy check|cyclic redundancy checks]] based on transmission speed and error rates. Block sizes can range from 32 to 4096 bytes. C-Modem also supports [[Duplex (telecommunications)|full duplex]] communication.

==References==
{{Reflist}}

==External links==
* [http://www.cpeterso.com/protocols/CMODEM11.ARJ C-Modem 1.1 program] {{Webarchive|url=https://web.archive.org/web/20071008091342/http://www.cpeterso.com/protocols/CMODEM11.ARJ |date=2007-10-08 }}
* [http://www.cpeterso.com/protocols/CMODEM.TXT C-Modem documentation] {{Webarchive|url=https://web.archive.org/web/20071008090937/http://www.cpeterso.com/protocols/CMODEM.TXT |date=2007-10-08 }}

{{Modem file transfer protocols}}

[[Category:BBS file transfer protocols]]


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