Path: utzoo!attcan!uunet!portal!cup.portal.com!Hank
From: Hank@cup.portal.com (Hank W Oxford)
Newsgroups: comp.sys.cbm
Subject: Re: Zmodem on commodores?
Message-ID: <15177@cup.portal.com>
Date: 28 Feb 89 03:57:05 GMT
References: <1647.23FB6F1E@isishq.FIDONET.ORG>
Organization: The Portal System (TM)
Lines: 16

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.