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What is the purpose of the XMODEM protocol checksum? How is that checksum formed? 

   What is the purpose of the XMODEM protocol checksum? How is that checksum formed?
Understanding Data Communications: From Fundamentals to Networking
Understanding Data Communications: From Fundamentals to Networking
Gilbert Held 3rd Edition
Chapter 10, Problem 15 ↓

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XMODEM is a simple file transfer protocol developed in the late 1970s for transmitting files between computers over serial lines.  Show more…

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