Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!mit-eddie!uw-beaver!zephyr.ens.tek.com!tektronix!reed!omen!caf
From: caf@omen.UUCP (WA7KGX)
Newsgroups: comp.dcom.modems
Subject: Re: Zmodem Worked!!
Message-ID: <60@omen.UUCP>
Date: 11 Aug 90 12:33:16 GMT
References: <1990Aug7.011103.6176@ariel.unm.edu> <606@gagme.chi.il.us> <607@gagme.chi.il.us>
Distribution: usa
Organization: Omen Technology INC
Lines: 40

In article <607@gagme.chi.il.us> grahj@gagme.chi.il.us (jim graham) writes:
:In article <606@gagme.chi.il.us> I wrote some stuff about getting X/Y/Zmodem
:to work through a network....but forgot to mention a couple of things....
:and my computer at work just reminded me....when a transfer refused to go....
:
:First, if you are going from a dos box to a UN*X machine, you may run into 
:problems with file name arguments.....  dos seems to think that all filenames
:are in UPPERCASE, while UN*X understands both upper and lower case....

The ZMODEM standard specifies that pathnames be sent in lower case unless
the sending operating system supports upper and lower case.  Don't hack
rz, get a good DOs comms program with a good ZMODEM.

:Second, and this is a trial-and-error thing, you may have to add some options
:to the rz command when uploading from a dos-box to UN*X (others?) in the case
:of binary files (e.g., tars, compressed tars, etc.).  If you try the transfer,
:and it doesn't manage to send even the first packet (but the transfer DID 
:manage to get started.....), you may need to tell the Zmodem receiver 2 things:
:
:   1) this is a binary file (normally it figures this out on its own....but...)
:   2) force the sender to escape all Zmodem transfer control chars.

A good ZMODEM implementation can handle this at the sending end,
and should default to binary transfer.

:
:To do this, give rz the ``-be'' options.
:
:This will result in reduced throughput (on a good phone line, at 2400 bps,
:normal throughput tends to be about 245 CPS --- with the -be options, it 
:drops to about 190 CPS).

The control character escaping can be controlled more closely with
MODEM-90(tm) reducing the overhead.

Chuck Forsberg WA7KGX          ...!tektronix!reed!omen!caf 
Author of YMODEM, ZMODEM, Professional-YAM, ZCOMM, and DSZ
  Omen Technology Inc    "The High Reliability Software"
17505-V NW Sauvie IS RD   Portland OR 97231   503-621-3406
TeleGodzilla:621-3746 FAX:621-3735 CIS:70007,2304 Genie:CAF