Path: utzoo!attcan!uunet!lll-winken!ames!ncar!mailrus!sharkey!atanasoff!jwright
From: jwright@atanasoff.cs.iastate.edu (Jim Wright)
Newsgroups: comp.sys.amiga
Subject: Re: high-speed file transfer
Keywords: Amiga sun modem apollo zmodem ymodem
Message-ID: <646@atanasoff.cs.iastate.edu>
Date: 12 Jan 89 10:30:07 GMT
References: <891@io.UUCP>
Reply-To: jwright@atanasoff.cs.iastate.edu (Jim Wright)
Organization: Iowa State U. Computer Science Department, Ames, IA
Lines: 40

In article <891@io.UUCP> dbjag@io.UUCP (David Benjamin x4050) writes:
>Does anyone have a method of transferring files over a *high-speed* modem
>connection between an Amiga and a Sun (4.2 BSD UNIX)?  The connection is
>through a pair of US Robotics Courier HST modems connected at 9600 baud (ARQ).

>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?

I have my 2000 hardwired to my Apollo 4000 at 19200 bps.  My startup sequence
always starts up Handshake, a shareware communications package.  I have
found it to be the only program reliable at these high speeds.  (I can't
claim to have tried them all.)  It is a very good emulation of VT100,
which is a plus on a Unix system.  It supports YMODEM-Batch.  It does not
currently support ZMODEM.

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.

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+.

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

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.

Hope this helps.  Let us (Net) know if you find something better.