From: jh@cadre.com (Joe Hartley)
Newsgroups: comp.unix.questions
Subject: Re: Zmodem installation problem
Date: 14 Aug 92 14:13:18 GMT
Article-I.D.: fripp.1992Aug14.141318.1245
Reply-To: jh@cadre.com
Organization: Sun Microsystems, Inc.

In article 26441@eng.ufl.edu, zzang@whale.stat.ufl.edu (Zhuo Zang) writes:
>Hello, 
>Thanks for the responses !
>
>In article <1992Aug13.183019.4034@fripp.ri.cadre.com> jh@cadre.com writes:
>>In article 22845@eng.ufl.edu, zzang@whale.stat.ufl.edu (Zhuo Zang) writes:
>>>Hello,
>>>I try to install the Zmodem on the DECstation
>>>with Ultrix 4.2 .
>>>After I compiled all the programs, rz ,sz ,....
>>>I ran the programs. And it doesn't work.
>>
>>You may be confused about how ZModem works.  It actually sends its output
>>to stdout (on UNIX).  For example, when I dial into my UNIX box, I'll
>
>I really don't have any idea how those modems work.
>I thought the Kermit , Xmodem , Ymodem and Zmodem all worked
>the same way. They would send the data flow to the serial port
>at one end the comm line, and receive the data at the serial
>port at the other end.
>
>>type sz <filename> to initiate the download to my machine at home.  My 
>>comm program then actually understands that a Zmodem transfer has started,
>>and begins receiving automatically, although if yours doesn't, it can
>>certainly be started manually.
>>   I'm not exactly sure what you mean by "direct the data flow to the serial
>>port," though.  If you gave a little more detail as to how you're doing things,
>>we might be of a little more help.
>>
>
>I use the Procomm2.4.2, which doesn't have the Zmodem. But it does
>have the Kermit, Xmodem and Ymodem. and I use the Xmodem and Ymodem 
>when I connect to the BBS. on Unix I am using Kermit now,
>but it is slow. The Zmodem package says it also supports
>the Ymodem and Xmodem. So I use sz <file> on Unix to start
>downloading, and use the Ymodem in ProComm to receive <file>.
>According to the Zmodem manual, the Zmodem will auto down shift
>to Ymodem, if it finds the other end doesn't support the Zmodem.
>However, nothing is transmitted in this way.
>
>Since all the data flow should be transmitted thru the serial port
>when we use the modem to connect to the Unix, I doubt that
>the Zmodem had sent the data to somewhere else, not the serial port.
>

Well, I've never really trusted the "auto-shift" to a different protocol.
You can have the sz program start as YModem by calling it as sb instead of
sz.  Or, you can find Zmodem for MS-DOS somewhere and install it as an
external protocol in Procomm.  I did this about 5 years ago when I was
forced to work on MS-DOS machines, and it worked well.

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