Date   : Wed, 28 Aug 1985 07:09:00-PDT
From   : STANLEY@USC-ECLB.ARPA
Subject: Re: TOPS-20 MODEM

       
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    Date: 28 Aug 1985 01:32-EDT
    From: ABN.ISCAMS@USC-ISID.ARPA
    To: info-cpm@BRL.ARPA
    Subject: TOPS-20 MODEM
    Return-Path: <info-cpm-request@AMSAA>
    Message-ID: <[USC-ISID.ARPA]28-Aug-85 01:32:36.ABN.ISCAMS>
    Sender: ABN.ISCAMS@USC-ISID.ARPA
    
    NetLandians,
    
    Has anyone else experienced problems with the TOPS-20 file transfer program
    MODEM when working through a TAC?
    
    I've tested the latest from SIMTEL20 PD:<CPM.TOPS-20> (I think .315), and
    same problem as the one on my host.
    
    Symptoms:  With two different versions of a micro MODEM using Christensen
    Protocol (MODEM901 for the Compupro and MDM730 for my Decision I CP/M),
    same error:  Incorrect Record # (or was it Header #).  Program never
    begins to download.  Watching and capturing the mainframe MODEM packet,
    I see with a DUMP two ASCII 01 characters as a leader.
    
    MODEM used to work for me quite a few months ago, but now no luck.
    Uploads ("Sends") also fail -- MODEM first returns an ASCII 87H, and then
    as I recall, CRs and sometimes a NAK.  No packets move.  Both Checksum
    and CRC fail.
    
    I experimented with toggling my TAC Trap (sending the TAC intercept
character
    twice), but to no avail.
    
    Sure has me bugged!  Would appreciate any help/suggestions.
    
    Regards,
    David Kirschbaum
    Toad Hall
    ABN.ISCAMS@USC-ISID
    
             --------------------
               
David

I have had so much trouble with the TOPS-20 MODEM program for the
past two  years  that  I  finally  gave  uponit  and  use  KERMIT
exclusively  on  the net.  Nothing I or the ECLB folks did seemed
to help.  Tried all of the TAC settings, too.   KERMIT  works,  I
recommend  it.  (If using binary file transfer, set the TAC using
the command sequence @@d c a, @@b o s, @@b i s first.)

                                ...Dick