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From: ked@garnet.berkeley.edu (Earl H. Kinmonth)
Newsgroups: comp.dcom.modems
Subject: Re: Zmodem source code?
Message-ID: <25479@agate.BERKELEY.EDU>
Date: 15 Jun 89 04:26:53 GMT
References: <868@orbit.UUCP>
Sender: usenet@agate.BERKELEY.EDU
Reply-To: ked@garnet.berkeley.edu (Earl H. Kinmonth)
Organization: University of California, Berkeley
Lines: 56

In article <868@orbit.UUCP> pj@pnet51.cts.com (Paul Jacoby) writes:
>Does anyone know of a source of the source code for the Zmodem protocol from
>Chuck Forsberg?  I understand there are both 'public domain' and proprietary
>versions of the protocol, and am attempting to secure the public domain
>source.  I have a spec sheet for Zmodem dated April 1987, but have not been
>able to find anything much more recent.

I can supply two version of the "pd" zmodem source code, one dated
88:03:03, the other dated, 89:05;25.

I have slightly hacked each to provide a more useful command summary
and to accept a -F name (take file list from named file) option. I have
also rewritten the documentation a bit to show how to interface the two
versions to CU, a "pd" cu from Sandy Z's bulletin board. I have also
rewritten to makefiles for more generality.

I find the earlier version better than the later. It accepts input from
a pipe.

Generally, I'm impressed with zmodem as a protocol. I use it daily and
heavily. I'm less impressed with Forsberg's understanding of portable C
code. As someone who has written a large scale data base that runs
under MSDOS, Sco Xenix, and various flavors of UNIX, etc. I know a bit
about portability. A jillion #ifdefs in the source code is not the
clearest way to go.

If you want the zmodem source code, send e-mail to the address in the
signature.  NOTE THAT THIS ADDRESS IS NOT THE SAME AS THE ONE YOU GET
BY USING THE R COMMAND OF THE MAILREADER.  IF YOU DON'T SEND IT TO THE
ADDRESS THAT IS CONVENIENT FOR ME, I WILL NOT REPLY.

Unless otherwise requested, I will ship a package that consists of:

(a)	CU (a pd version of cu that can use zmodem);

(b)	hacked zmodem (described above);

(c)	a "shareware" version of zmodem for MSDOS.

This package is made by

tar | compress | uublock | mail

uublock calls uuencode and splits the result into 60K blocks.

If you don't get a reply within a week, it usually means your address
doesn't work.

Earl H. Kinmonth
History Department
University of California, Davis
916-752-1636 (voice, fax [2300-0800 PDT])
916-752-0776 secretary

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ehkinmonth@ucdavis