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- ░░░░░░░░░░░░░░░░░░ n the beginning there was Xmodem, and file transfer was
- without form and void. Xmodem was the first of the
- common file transfer protocols. Xmodem transfers the
- file in small packets of 128 bytes each. After each
- packet, Xmodem performs a check to insure that the
- packet was transferred correctly. You can tell when
- Xmodem is performing this check if you have an external
- modem because the lights indicating RD or SD (depending
- on if you are sending or receiving) stop flashing for
- an instant. That instant (actually a substantial part
- of a second) represents dead time as far as the transfer
- is concerned because no data is being transferred while
- Xmodem is performing the packet check.