Looking for an xmodem compatable program

[Randy Taylor]

I'm looking for a communications program that is a variant of the old
xmodem program.  Later versions are ymodem and zmodem.  I've heard as 
well that the Unix variants of these are now names rz and sz.  If anyone
can help me I'd sure appreciate it.  I am using an 12 MHZ IP6 processor 
if that makes a difference.  Please reply via e-mail.
    Thanks,
    Randy Taylor