00readme.txt
rzsz9305.tar
        An implementation of the XMODEM, YMODEM, and ZMODEM protocols,
        written in C.  From the original author.
        Contributor: Chuck Forsberg <caf@omen.uucp>
umodem.tar
        An implementation of the XMODEM, TERM II File Transfer Protocol #1,
        and TERM II File Transfer Protocol #4.  This version runs under
        several versions of UNIX.
        Contributor: Dave Curry <davy@erg.sri.com>
xmodem31.tar
        An implementation of the Christiansen (XMODEM) file transfer protocol.
        This implementation works only under 4.2/4.3BSD. Version 3.10.