Path: utzoo!utgpu!watserv1!watmath!att!att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!van-bc!ubc-cs!uw-beaver!zephyr.ens.tek.com!tektronix!percy!fryepro!fryeten!doug
From: doug@fryeten.uucp
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: RZSZ.TLB - VMS ZMODEM send/rcve prg & doc (Text LIB file)
Message-ID: <13.2747e8d5@fryeten.uucp>
Date: 19 Nov 90 21:14:45 GMT
References: <1990Nov17.062459.9537@nas.nasa.gov>
Organization: Frye Electronics, Inc., Tigard OR
Lines: 69

In article <1990Nov17.062459.9537@nas.nasa.gov>, roelofs@nas.nasa.gov (Cave Newt) writes:
> wilker@descartes.math.purdue.edu.UUCP (Clarence Wilkerson) writes:
> 
>>>I use rz/sz to and from a pc-sun link, and they are great..seem
>>>twice as fast as kermit. But how do I use these between two
>>>unix systems over a phone line?
> 
> You don't.
> 
> 
> ts@uwasa.fi (Timo Salmi) writes:
> 
>>From tsfaq13.arc (soon to be released).  (It shouldn't be overly
>>different between two Unixes).
>> [about PC-to-Unix communications]
> 
> Unfortunately, it IS different between two Unixes, or a Unix and a VMS,
> or what have you.  The reason is that rz/sz, like most mainframe comm
> protocols, send data by writing it to the screen and receive it by read-
> ing from the "keyboard" (i.e., stdin).  It is the PC end of things which 
> controls the phone line and either "types" the data out the phone line 
> or intercepts it before it gets to your screen (depending on whether
> you're uploading or downloading, respectively).  The mainframe packages 
> have no way to associate themselves with a communications port, much less 
> dial out and deal with the initial connections, logging in, and other 
> stuff.

On the contrary VMS has a way to do it through the use of the logical name
TT: and through switching between SET HOST/DTE and RZ or SZ.  I have a DCL
program which handles this as perfectly and as transparently as Kermit and
other integrated communication programs.  My guess is that you can do the
same thing with Unix with a shell program and the use of redirection,
although I have very little experience with unix so I can't speak from 
experience.

> But don't take MY word for it...from Forsberg's rz documentation (version
> 3.03 / 25 May 1989, but still applicable, presumably; the sz documentation
> has the same disclaimer):
> 
> 	Rz is not intended be called from cu(1), or other communica-
> 	tions   programs.    Unix   flavors   of  Omen  Technology's
> 	Professional-YAM communications software are  available  for
> 	dial-out applications.
> 
> [Quoted without permission...bwah ha ha ha ha ha!!!!!]
> 

Read the above very carefully.  All he said was that RZ is not "INTENDED"
to be called from cu(1), or other communication programs.  He didn't say
that it couldn't be accomplished.  On the other hand I did email him
directly some months ago and at that time he indicated to me that it couldn't
be done. A little while later I found a DCL program on a bulletin board that
proved him wrong. I know this isn't much help to the original question about
it's use under Unix but it may be a hint to trying something in combination
with the shell language, an existing simple terminal communication program 
(perhaps cu), and RZ and SZ.

By the way if anybody wants a copy of the DCL program to look at and modify
for your own purposes, I would be happy to email it to you.  Of course this
would probable be of more interest to comp.os.vms since DCL is a part of
VMS.

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