Date   : Mon, 11 Jun 1984 09:17:02 pdt
From   : Gerald S. Key <key%marlin@Nosc.ARPA>
Subject: File Transfers thru a TAC

I  am  trying to transfer a text file from a Kaypro 4  through  a 
MILNET  TAC (specifically,  the ACCAT-TAC) to VAX-11/780  running 
4.2bsd UNIX.   I am using a MODEM7 variant,  kmdm795, in checksum 
mode  on the Kaypro.   I have used both xmodem and umodem on  the 
VAX side,  in both receive-text and receive-binary mode and  also 
with  the 7-bit mask option (with umodem).   I have tried sending 
both  with  and without "binary input start" and  "binary  output 
start" set on the TAC.   In each instance I receive the following 
error message:  

          Sending #1 (0001H) 
          87H Rec'd, not ACK
          Sending #1 (0001H) 
          87H Rec'd, not ACK 
               .        .
               .        .

until the transfer dies from too many errors.  

Curiously,  if I turn things around and transfer a file from  the 
VAX to the Kaypro using the same software and the same path,  all 
works fine! 

I  have  been using umodem/xmodem and kmdm795 for a long time  to 
transfer  files without problem to/from the same VAX via a  local 
area network.  

Any suggestions?  

                           Gerry Key 
                              key@nosc.arpa
                              ...!ucbvax!sdcsvax!noscvax!key