Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 Apollo 5/13/85; site apollo.uucp 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. Lines: 16 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.