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From: wales@valeria.cs.ucla.edu (Rich Wales)
Newsgroups: comp.dcom.modems,comp.os.msdos.apps
Subject: Questions about ZMODEM and MobyTurbo
Message-ID: <37296@shemp.CS.UCLA.EDU>
Date: 26 Jul 90 07:02:44 GMT
Sender: news@CS.UCLA.EDU
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Organization: UCLA CS Department, Los Angeles
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A few questions about the ZMODEM protocol, including the latest addition
thereto (ZMODEM MobyTurbo):

(1) Since part of my Ph.D. research involves data communication over
    serial links, it would be useful for me to find the technical specs
    of the ZMODEM protocol.  Are these freely available?  If so, where?
    Can anyone direct me to published technical specs of other protocols
    comparable to ZMODEM?

(2) I am using a USRobotics Courier HST modem from school (not a Dual
    Standard, and without the recent V.42 upgrade).  My serial port has
    a NS16550AN UART and is driven at 19.2k bps.

    Using straight ZMODEM over an 8-bit data path, I get transfer rates
    of about 1050-1080 bytes/second.  What kind of transfer rate should
    I expect to get with the new "ZMODEM MobyTurbo" option (assuming, of
    course, that both sending and receiving sides support MobyTurbo)?

(3) Is the RZSZ material (C source code for RZ and SZ) distributed as
    part of the registered DSZ package from Omen Technologies?  Or do
    you have to pay extra for it, over and above the DSZ registration?

(4) I currently use Telix 3.12, which has ZMODEM builtin.  If I decide
    to use DSZ instead of the Telix code (something I would presumably
    do only if MobyTurbo is fantastically better than straight ZMODEM
    =and= if the new MobyTurbo-capable RZSZ source code is cheap), is
    there any way to get Telix's "ZMODEM auto-downloads" capability
    (option "N" on the "terminal options" setup screen) to fire up the
    external program (DSZ) instead of the builtin Telix ZMODEM?

I've got this sick premonition that the answers to my questions will be
something like "proprietary", "a little faster, but not much", "pay lots
more $$$", and "can't be done".  But maybe I'll be pleasantly surprised.

--
-- Rich Wales <wales@CS.UCLA.EDU> // UCLA Computer Science Department
   3531 Boelter Hall // Los Angeles, CA 90024-1596 // +1 (213) 825-5683
   "Indeed!  Twenty-four is the gateway to heroic salvation."