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From: holloway@drivax.UUCP (Bruce Holloway)
Newsgroups: comp.unix.questions,comp.sys.ibm.pc,comp.sys.att,comp.sources.wanted,misc.wanted
Subject: Re: What is the Diff between Xmodem/Ymodem
Message-ID: <770@drivax.UUCP>
Date: Wed, 14-Jan-87 12:49:55 EST
Article-I.D.: drivax.770
Posted: Wed Jan 14 12:49:55 1987
Date-Received: Thu, 15-Jan-87 04:19:18 EST
References: <2374@psuvax1.UUCP> <305@hoqax.UUCP>
Reply-To: holloway@drivax.UUCP (Bruce Holloway)
Organization: Digital Research, Inc., Monterey
Lines: 22
Xref: mnetor comp.unix.questions:659 comp.sys.ibm.pc:988 comp.sys.att:120 comp.sources.wanted:313 misc.wanted:421

In article <305@hoqax.UUCP> twb@hoqax.UUCP (BEATTIE) writes:
>> Now, one question for all of you guys who know your communication 
>> packages.  What is the difference between Xmodem/Ymodem/Umodem/Kermit.
>
>Add rb/sb and zmodem to the list.
>What is the difference between all these?

XMODEM	128 byte packets, 8 or 16 bit checksum
YMODEM	1024 byte packets, 8 or 16 bit checksum
ZMODEM	128 byte packets sent four at a time, 8 or 16 bit checksum
WMODEM	Same as ZMODEM (I think), but for timesharing systems
UMODEM	?
KERMIT	Not related to the above protocols. Kermit can send files to sites
	when there are severe restrictions that XMODEM et.al. can't handle.
	Such as 7 bit lines, can only take a line at a time, control
	characters usually not allowed, etc. Kermit is also a sender driven
	protocol, unlike the receiver driven XMODEM. Also, Kermit can get
	directories, type files, etc. on the remote machine.
-- 
....!ucbvax!hplabs!amdahl!drivax!holloway
"What do you mean, 'almost dead'?" "Well, when you stop breathing, and moving
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