Path: utzoo!attcan!uunet!lll-winken!ames!ucsd!orion.cf.uci.edu!oberon!pollux.usc.edu!papa
From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga
Subject: Re: high-speed file transfer
Keywords: Amiga sun modem apollo zmodem ymodem
Message-ID: <14625@oberon.USC.EDU>
Date: 12 Jan 89 17:51:08 GMT
References: <891@io.UUCP> <646@atanasoff.cs.iastate.edu>
Sender: news@oberon.USC.EDU
Reply-To: papa@pollux.usc.edu (Marco Papa)
Organization: Felsina Software, Los Angeles, CA
Lines: 57

In article <646@atanasoff.cs.iastate.edu> jwright@atanasoff.cs.iastate.edu (Jim Wright) writes:
|In article <891@io.UUCP| dbjag@io.UUCP (David Benjamin x4050) writes:
||I'd like to be able to transfer binary at as fast a rate as possible, 
||relying on the modems for error checking. 
|
||Is there anyone out there with a similar situation who *IS ACTUALLY USING*
||a method for high-speed binary file transfer from Amiga to a UNIX machine?
|
|For your situation, YMODEM-G would be ideal.  You could let those sexy
|modems do all your error detection/correction for you, while the protocol
|simply validates the files and informs you of problems.  I have not seen
|any implementations of YMODEM-G for either the Amiga or Unix.

Well, you didn't look around enough. ZMODEM and YMODEM-g for UNIX have been
available "with sources" for over a year from Chuck Forsberg's TeleGodzilla
UNIX-based BBS (503)-621-3746.  Chuck is the author of ZMODEM. As far as the
Amiga is concerned, A-Talk III Release 1.0e includes Ymodem-G.  Note that
Ymodem-G does require and error-correcting modem to work properly.

|Next best would be ZMODEM.  It's capable of much greater throughput
|than any of the other error detecting protocols.  While ZMODEM is finally
|starting to appear on the Amiga, I have found none to work well at high
|speeds.  They either crash the Amiga or hang the serial line on the
|Apollo.  I can verify the ZMODEM on the Unix, since it works flawlessly
|when connected to PCs using Procomm+.

I know of 3 implementations of ZMODEM for the Amiga that work just fine at
high speeds: Online! has it (I don't know which version), ZCOMM [a modified
version of DJ James Comm 134 program] has it, and A-Talk III has it.  There
is also a version of Chuck's sz/rz programs that can be used as external 
protocols with other pd/shareware programs such as Access!.

|Third in line would be YMODEM-Batch.  Multiple file transfers are
|indispensible.  This is a relatively efficient protocol, so you should
|get good throughput.

A-Talk III has that one, too.

|Kermit is good if you go through a protocol converter or a communications
|switch.  The best that can be said about it is that it works on just
|about everything (which really is a pretty good thing to say!).  It's
|not fast, but it's better than nothing.

Kermit has been around on the Amiga since the benning. Practically any 
commercial comm program supports it.

And don't forget WXMODEM (windowed-Xmodem).  With People Link you can get
throughput that approaches ZMODEM.

As far as supporting protocols, right now the Amiga is definitely not
second to any of the other machines, being IBM PCs, Macs or any other.

-- Marco Papa 'Doc'
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