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P_HELP_1.TXT
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1996-04-15
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Help for Xmodem-1K
This is a small variation of Xmodem that sends blocks that are 1
Kilobyte (1024 bytes) in size. This protocol is still mistakenly
called 'Ymodem' by many programs, but people are gradually moving
over to the proper name.
When the receiving computer is satisfied that a block has arrived
intact, it signals so and waits for the next block. Error checking is
a checksum or a more sophisticated Cyclic Redundancy Check. Telix
supports both and will automatically use the right one. During a
download, Telix will attempt to use the CRC, but will switch to
checksum if it seems the host does not support CRC. The Xmodem
protocol also needs a setup of no parity, 8 data bits, and 1 stop
bit. If your communications parameters are different from these when
you start an Xmodem transfer, Telix will switch to the required setup
for the transfer, and back to the original setup after it is
finished.
Xmodem-1K is much faster than Xmodem, but because of the need to wait
for acknowledgement after each block, Xmodem is capable of
approximately 90-95% of the maximum theoretical transfer rate.