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From: heffner@bsdpkh.UUCP (Paul K Heffner)
Newsgroups: net.micro.apple
Subject: Re: Data Protocol Question/80-col vid.
Message-ID: <130@bsdpkh.UUCP>
Date: Thu, 7-Nov-85 23:03:47 EST
Article-I.D.: bsdpkh.130
Posted: Thu Nov  7 23:03:47 1985
Date-Received: Sun, 10-Nov-85 07:22:19 EST
References: <557@ihlpm.UUCP> <9800016@uiucuxa>
Organization: AT&T-IS (SDSS), Orlando Fl.
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   Benjy Mouse writes:
> 
> Ok, here it is: Ward Christensen wrote the XMODEM protocol with CRC
> checking...(Cyclic redundancy check), so that I beleive that all of
> the protocols you just mentioned are the same.
>  
> Christiansen=XMODEM=XMODEM/CRC
>  
> How's that?

	That's pretty close... Actually the baseline Christiansen protocol
    only checks for transmission errors with a raw checksum. (Add all
    the characters in the 128 byte buffer up in a 16-bit register tossing
    out any carries.. the result is your checksum). CRC checking was added
    sho