Path: utzoo!attcan!uunet!lll-winken!ames!mailrus!csd4.milw.wisc.edu!jgreco
From: jgreco@csd4.milw.wisc.edu (Joe Greco)
Newsgroups: comp.sys.cbm
Subject: Re: Zmodem on commodores?
Message-ID: <1371@csd4.milw.wisc.edu>
Date: 1 Mar 89 06:58:57 GMT
References: <1647.23FB6F1E@isishq.FIDONET.ORG> <15177@cup.portal.com>
Sender: news@csd4.milw.wisc.edu
Reply-To: jgreco@csd4.milw.wisc.edu (Joe Greco)
Organization: Not around here. Totally Unorganized.  A Real Mess.
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In comp.sys.cbm article <15177@cup.portal.com>, Hank@cup.portal.com (Hank W Oxford) wrote:
]Perhaps getting Zmodem to run on a Commodore isn't as difficult as
]everyone thinks.  Zmodem does not *have* to send data constantly.
]Taken from various places in the Zmodem Reference:
]       ZMODEM allows a choice of data streaming methods
]       selected according to the limitations of the sending
]       program operating environment, receiving program
]       operating environment, and the transmission channel(s).
]       If the receiver cannot overlap serial and disk I/O, it
]       uses the ZRINIT frame to specify a buffer length which
]       the sender will not overfill before sending a ZCRCW
]       packet.
]       ZCRCW data packets expect a response before the next
]       frame is sent.  If the receiver does not indicate
]       overlapped I/O capability with the CANOVIO bit, the
]       sender uses the ZCRCW to allow the receiver to write its
]       buffer before sending more data.

Obviously this fella has never encountered real world implementations
of Z-Modem  :-)
 
:-) :-) :-)

Come on, when was the last time anybody did even a 3/4 implementation
of Z-Modem?  There are probably a lot of reasonably good ones out
there.  No fault of the authors, since Z-Modem is a complex protocol
and a "full" implementation is almost unreasonable.

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