XMODEM version '6.C' (06/28/84) is a file xfer utility.
Uncredited. It was uploaded to 8/N/1 #001, as being in the
public domain, by Tony Czaja of Westminster,CO on 04/20/85.
It is a model 4 ONLY communication utility.
 
Syntax:     XMODEM6C R filespec/ext:d <ENTER>
            XMODEM6C S filespec/ext:d <ENTER>
 
Source: Guy Omer - sysop of 8/N/1 #001 - 904/377-1200