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Path: utzoo!watmath!clyde!cbosgd!ihnp4!drutx!mtuxo!mtunh!vax135!cornell!uw-beaver!apollo!jimv
From: jimv@apollo.uucp (James Vienneau)
Newsgroups: net.micro.apple,net.dcom
Subject: Data Protocol Question
Message-ID: <29fa55fa.46b9@apollo.uucp>
Date: Wed, 6-Nov-85 14:31:54 EST
Article-I.D.: apollo.29fa55fa.46b9
Posted: Wed Nov  6 14:31:54 1985
Date-Received: Fri, 8-Nov-85 07:24:15 EST
Organization: Apollo Computer, Chelmsford, Mass.
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Xref: watmath net.micro.apple:2294 net.dcom:1435

>>I am now exploring the world of Bulletin Boards.  Most seem to 
>>use various forms of data exchange protocol like XMODEM or
>>XMODEM/CRC.  Access II uses Christensen (sp?) protocol.  I have
>>been told that XMODEM and Christensen protocols are the same.
>>Is this true?  What's the difference between XMODEM, XMODEM/CRC
>>and some other popular protocols?

>XMODEM describes how each individual block is sent.  Ward Christensen
>is XMODEM protocol with a particular description of block 0, and the
>fact that the other blocks are data blocks.
>I will post a (technical) description of the protocol if requested.

I for one would be very interested in a technical discription/discussion
of the transfer protocols. Since I have designed and built the hardware
as well as written the driver for my serial port, I would like to take this 
the final step. Any help would be appreciated.