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Conference 7.286::atarist

Title:	Atari ST, TT, & Falcon
Notice:	Please read note 1.0 and its replies before posting!
Moderator:	FUNYET::ANDERSON

Created:	Mon Apr 04 1988
Last Modified:	Tue May 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	1433
Total number of notes:	10312

1230.0. "XMODEM and LAT's" by POWDML::STEIL () Wed Jan 08 1992 17:33

           <<< OLDTMR::SYS$SYSDEVICE:[NOTES$LIBRARY]ATARIST.NOTE;1 >>>
                       -< Atari's 68000 based systems. >-
================================================================================
Note 1230.0                     XMODEM and LAT's                      No replies
POWDML::STEIL                                        22 lines   8-JAN-1992 15:30
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    After reading several years worth of notes on the subject of XMODEM and
    LAT's in this conference, I still haven't been able to figure out if
    it's possible to successfully use XMODEM (or YMODEM or ZMODEM) when
    communicating through a LAT to a VAX.
    
    When I try to do it, the first 16 blocks transfer OK but then there's a
    problem with the 17th block.
    
    The consistency of this - as pointed out by Jeff Lomicka years ago in
    another note - suggests a problem with XON/XOFF handling in the LAT.
    
    So I've tried SET PORT FLOW DISABLE at the LAT prompt, followed also by
    SET TERM/NOTTSYNC/NOHOSTSYNC at the DCL pormpt, but all to no avail. I
    still get hung up on the 17th block.
    
    Has anybody ever succeeded in using XMODEM across a LAT? And does TSN
    and a dial in line make it worse?
    
    Thanks if you know the answer.
    
    Gil

T.R	Title	User	Personal Name	Date	Lines
1230.1	I prefer ZMODEM	ULTRA::KINDEL	Bill Kindel @ LTN1	`Wed Jan 08 1992 18:44`	33
	Re .0: > After reading several years worth of notes on the subject of XMODEM and > LAT's in this conference, I still haven't been able to figure out if > it's possible to successfully use XMODEM (or YMODEM or ZMODEM) when > communicating through a LAT to a VAX. I use ZMODEM over a LAT dialup line (to VMS systems) quite regularly. ZMODEM works first time, every time, and is MUCH faster than KERMIT. It also lacks the pad-to-the-end-of-the-block "feature" of XMODEM that results in a need to strip the ######## pad characters off afterwards. > When I try to do it, the first 16 blocks transfer OK but then there's a > problem with the 17th block. > > The consistency of this - as pointed out by Jeff Lomicka years ago in > another note - suggests a problem with XON/XOFF handling in the LAT. > > So I've tried SET PORT FLOW DISABLE at the LAT prompt, followed also by > SET TERM/NOTTSYNC/NOHOSTSYNC at the DCL pormpt, but all to no avail. I > still get hung up on the 17th block. This sounds familiar. As I remember it, I had to interrupt the LAT session and SET SESSION PASSALL in order to get the LAT out of the way. (The LAT won't do ANY flow control for you when this is set -- you might be able to get things to work with SET SESSION PASSTHRU, but I'm doubtful.) Since I changed to ZMODEM, I haven't had to fool with it. > Has anybody ever succeeded in using XMODEM across a LAT? And does TSN > and a dial in line make it worse? Yes and yes. TSN only passes 7-bit data. XMODEM requires 8-bit data. Therefore, you CAN'T do XMODEM transfers over TSN connections.
1230.2	SET TERM/PASSALL	VFOVAX::PATTERSON	The world is flat, it's the universe thats round	`Thu Jan 09 1992 01:10`	13
	> This sounds familiar. As I remember it, I had to interrupt the LAT > session and SET SESSION PASSALL in order to get the LAT out of the way. > (The LAT won't do ANY flow control for you when this is set -- you > might be able to get things to work with SET SESSION PASSTHRU, but I'm > doubtful.) Since I changed to ZMODEM, I haven't had to fool with it. I am not 100% sure, but if the program set your LTA terminal to passall, the LAT post should be passall as well. NOTE: this only works if you are only talking to 1 decserver. If you jump through any back-back decservers as a gateway, it will not work. Jim Patterson
1230.3	A ZMODEM to copy?	POWDML::STEIL		`Thu Jan 09 1992 19:28`	4
	Bill, do you have a working ZMODEM in your account that you'd be willing to let me copy? Gil
1230.4	Please Stand By...	ULTRA::KINDEL	Bill Kindel @ LTN1	`Fri Jan 10 1992 11:49`	8
	Re .3: > Bill, do you have a working ZMODEM in your account that you'd be > willing to let me copy? I'll have to move my ZMODEM stuff (and VMS versions of other handy utilities, like LHARC & ZOO) to a place from which they can be made available to the masses. I'll send mail when I'm ready.