Path: utzoo!attcan!uunet!cbmvax!daveh
From: daveh@cbmvax.UUCP (Dave Haynie)
Newsgroups: comp.sys.amiga
Subject: Re: high-speed file transfer
Message-ID: <5686@cbmvax.UUCP>
Date: 12 Jan 89 21:01:32 GMT
References: <891@io.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 41

in article <891@io.UUCP>, dbjag@io.UUCP (David Benjamin x4050) says:
> Keywords: Amiga sun modem

> Does anyone have a method of transferring files over a *high-speed* modem
> connection between an Amiga and a Sun (4.2 BSD UNIX)?  

Standard Kermit is a pig.  Don't use it over a high speed modem, or really,
any other time you can avoid it.

> The connection is through a pair of US Robotics Courier HST modems 
> connected at 9600 baud (ARQ).

My usual connection is a direct line between a UNIX VAX and my Amiga
at 19,200 baud.

> I currently use Kermit for file transfers, but because of its constant error
> checking it clogs the hell out of the high-speed connection protocol employed
> by the modems.  It is actually faster to reconnect at 2400 baud to transfer
> using kermit than to use 9600 baud.

> I'd like to be able to transfer binary at as fast a rate as possible, 
> relying on the modems for error checking. 

For fast transfers, you'd do much better going to ZModem.  I get extremely
fast transfers using ZMODEM, probably better than 4x that of kermit, at
least (never actually measured it).  If you can count on the error
check/correct of your modem link, supposedly YMODEM-G will go even 
faster.  The ZMODEM sources for both Amiga and UNIX are pretty readily
available.  The commercially available ATalk3 program (distributed by
OXXI) supports ZMODEM and YMODEM-G, though I haven't seen any publically
distributed YMODEM-G sources, I suspect it's pubically documented
somewhere.

> -- 
> - Dave Benjamin                                                               -
> - Interleaf                                                                   -
> - ...!eddie.mit.EDU!ileaf!dbjag                                               -
-- 
Dave Haynie  "The 32 Bit Guy"     Commodore-Amiga  "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: D-DAVE H     BIX: hazy
              Amiga -- It's not just a job, it's an obsession