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Message from discussion Zmodem PD 65c02 Source
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Todd P. Whitesel  
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 More options Jul 31 1991, 9:34 pm
Newsgroups: comp.sys.apple2
From: tod...@nntp-server.caltech.edu (Todd P. Whitesel)
Date: 31 Jul 91 04:27:42 GMT
Local: Wed, Jul 31 1991 2:27 pm
Subject: Re: Zmodem PD 65c02 Source

ta...@pro-odyssey.cts.com (Joe Quilici) writes:
>In-Reply-To: message from shrin...@Apple.COM
>I remember someone stating that Z-modem is impossible to do on an Apple //,
>mainly because it is a streaming protocol and the Apple can't directly
>write the incoming data to the HD; instead having to pause to write.  Does
>your code automatically pause the send, load the data or save the necessary
>data, and continue sending?

At the risk of putting words in Andy's mouth, his code has to do one of two
things:

        tell the other end to pause sending
        just write to the disk and let the garbled packet be retransmitted

ANY micro using a disk controller that causes interrupt blackouts faces the
same choice, and in no way does it prevent one from implementing Zmodem. It
does put take a bite out of the maximum transfer rate though.

Todd Whitesel
toddpw @ tybalt.caltech.edu


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