| A popular file-transfer
protocol developed in 1977 by Ward Christansen. The
protocol works by sending blocks of
data in 128-byte blocks from PC to PC. Included with this data is an error-detection
system called a checksum. When the data is received, the error detection system ensures
that the entire message reached its destination. If not, the receiving computer sends a
request for retransmission of the data.
Later was Xmodem 1k, a more powerful version
of Xmodem that allows larger files to be sent greater distances with the same reliable
error checking. Information is transmitted in 1KB blocks as opposed to Xmodem, which
transmits information in 128-byte blocks.
Also see: Modem definitions
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