When ZMODEM programs send pre-compressed 8-bit data files over 7-bit data channels,
C-Modem is a protocol driver developed by Lavio Pareschi (Rio de Janeiro) in 1989 that works similarly and better than ZMODEM.
Leech ZMODEM was suggested by Sam Brown but written by a long lost friend in Atlanta, GA.
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Leech ZMODEM was a LeechModem variant that was compatible with the faster ZMODEM streaming file-transfer protocol.
The program featured all the standard functions of a BBS of the time including file transfers in several competing protocols (XMODEM, YMODEM, YMODEM-G, ZMODEM) provided with the program or as third party software; they connected externally to the main program itself.
SEAlink, and most other XMODEM enhancements, were quickly displaced following the introduction of ZMODEM.
Chuck Forsberg collected a number of these into his YMODEM protocol, but poor implementation led to a further fracturing before they were re-unified by his later ZMODEM protocol.
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It was made obsolete by variants such as YMODEM-g or ZMODEM.
However, despite this protocol potentially being faster than ZMODEM it was still rarely used.
ZMODEM |
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