HDTenEightyP/NetNews huggingface dataset:
From: Petty@ralvm29.VNET.IBM.COM (Jack Petty)
Date: Mon, 28 Sep 92 08:07:13 EDT
Newsgroups: comp.dcom.modems
Subject: Re: taping modem signals
Disclaimer: This posting represents the poster's views, not those of IBM
News-Software: UReply 3.0
            <1992Sep27.164146.1489@kilowatt.uucp>

In <1992Sep27.164146.1489@kilowatt.uucp> Kilowatt admin writes:
>I don't see why 1200 shouldn't work or even 2400. The cassette recorder has
>a bandwidth that is MUCH higher than the phone line (isn't a phone line only
>
The human ear is not very sensitive to phase distortion so low cost tape
machines tend to be not very good at accurate reproduction of the
phase relationships of audio signals.  The popular Bell 103 300 bps
modulation scheme uses Frequency Shift Keying which is a modulation
method that does not require phase accuracy.  The popular higher speed
modulation schemes use Quadrature Amplitude Modulation in which the
phase relationships of the signals are important.  On the other
hand, some V.32 and faster modems have phase jitter compensation built
into their receivers and trellis coding provides some immunity to the
type of phase distortion caused by ADPCM.  I could imagine that the
7200 bps modulation of a good V.32 bis modem might be more recordable
than 2400 bps.
It is also true that today's popular modems at 1200 bps and faster do
use a handshaking technique at initial connnection time.
For an initial experiment, I would try a really good tape machine (20
years ago it would have been a Nagra - I don't know what is good today).
Jack Petty
Newsgroups: comp.dcom.modems
From: admerlev@sundae.triumf.ca ( Arnd Merlevede )
Subject: Could somebody please post ZyXEL Contest-file ?
Keywords: ZyXEL, Contest
Reply-To: admerlev@cipy.e-technik.uni-erlangen.de
Organization: University of British Columbia, Vancouver, B.C., Canada
Date: Tue, 6 Oct 1992 23:16:28 GMT

Hi, could please somebody, who retrieved that ZyXEL-Contest
file from their bbs post it here ?
Thanx a lot
Arnd

--
Any replies appreciated to : Arnd.Merlevede@cipy.e-technik.uni-erlangen.de
I hate to tell you, but you're only being simulated on the new cray !
(sdb: Would you like to save a backup of YOUR coredump ?)
From: serge.cote@synapse.isis.org (Serge Cote) 
Newsgroups: comp.dcom.modems
Subject: Re: USR sportster conversion announcement.
Date: 6 Oct 92 09:26:00 GMT
Distribution: world
Organization: SYNAPSE BBS - GATINEAU, QUEBEC - 819-561-4321
Reply-To: serge.cote@synapse.isis.org (Serge Cote) 

From: serge.cote@synapse.isis.org
Date: 4 Oct 92 23:39:51 GMT
Reply-to: sl14@crux3.cit.cornell.edu (Stephen Lee)

SL>Is it overlooked by everyone that if a cracker is able to put a trojan
SL>into a USR modem, he/she should be able to 'unpatch' the patch in the
SL>4.2 ROMs?  So what's the point of putting out a 4.1 ROM with a trojan!
SL>Just put out 5.0 w/superHST and V.fast!!!

SL>And then, the only people interested in putting a trojan into the 4.1
SL>ROM would be...  USR...

I have re-read the letter from the financial department of USRobotics
and the text is not explicit about the "trojan".   Me and some of my
friend who have read this letter on Compuserve, think they speak about
some programs on the shareware market which convert automatically your
Sportster to a Dual Standard.  Theses programs can install a trojan on
your computer.  It is not caused by the modem, it is caused by a program
you use to convert your modem.  Also I have seen some messages about
copying the Rom 4.1 in some networks, I never see a hacked rom, but it
is easy to include a trojan inside an EPROM...

Take care,
Serge Cote
---
 . DeLuxe./386 1.25 #7400 . That's not a Bug, that's a Free Enhanced Feature!
                                                                    
Newsgroups: comp.dcom.modems
From: skipm@dorsai.com (Skip Mac-Stoker)
Subject: Re: Slow Worldblazer to Worldblazer uucp transfers
Organization: The Dorsai Embassy +1.718.729.5018
X-Newsreader: Tin 1.1 PL4
Date: Mon, 5 Oct 1992 05:24:13 GMT

Try the new Codex V.fast modem 3260 model - I'm testing a beta pair, and
under dos, connected to BBS from NY to Virginia, I was getting 82 kbps on
a standard ZModem transfer.

Once again, Motorola/Codex excells. I am truly impressed, but from a company
like Codex, you can only expect the best.

No - I DON'T work for Motorola/Codex!

Skip
From: blackst@AC.WFUNET.WFU.EDU
Newsgroups: comp.dcom.modems
Subject: Terminate
Date: 25 Sep 92 22:22:21 GMT
Distribution: world
Organization: The Internet

Please remove me from this excellent mailing list.

I'm sorry to subject all the Info-Modems subscribers to this message, but
my previous attempts to cancel have all failed.
James Black              Internet:  blackst@wfunet.wfu.edu
From: geoff@zswamp.UUCP (Geoffrey Welsh)
Newsgroups: comp.dcom.modems
Subject: Re: Only National NS16550's OK/bug-free?
Date: Sat, 03 Oct 92 16:01:41 EDT
Organization: Izot's Swamp

kurtk@ee.ualberta.ca (Kurt Klingbeil) writes:

> There are a few 16550 'compatable' chips available.
> Presumably some are clones, others are licensed second-sources?
> 
> I have heard that ONLY the National-produced chips work reliably,
> with the possible exception of Goldstar's clone.
> 
> Has anyone had any experience with this, or could anyone shed some
> detailed light on this topic...

   I've had bad experiences with 16550 chips labelled "MX", and I know that 
early Western Digital chips had problems at lower baud rates.  My advice is to 
stick with genuine National Semiconuctor 16550A chips

Geoffrey Welsh, 7 Strath Humber Court, Islington, Ontario, M9A 4C8 Canada
geoff@zswamp.uucp, [xenitec.on.ca|m2xenix.psg.com]!zswamp!geoff (416)258-8467
         Coincidentally, most people who fight for "fairness" would be
         significantly better off under the system they call "fair"...
Newsgroups: comp.dcom.modems
From: nanook@eskimo.celestial.com (Robert Dinse)
Subject: Re: Can't go above 1400CPS
Summary: Cable
Organization: -> ESKIMO NORTH (206) For-Ever <-
Date: Mon, 5 Oct 1992 18:36:31 GMT

In article <717738803snx@n5ial.chi.il.us>, jim@n5ial.chi.il.us (Jim Graham) writes:
> If the cable you're using between the computer and the modem is
> ribbon cable, it may well be at fault --- make sure it's a good shielded
> cable.  ribbon cable is pretty much out for higher speeds (not sure just
> where it dies, though).

     I don't know exactly what constitutes "higher speeds" but I've been able
to get away with 6-foot ribbon cables at 38.4k just fine in so much as the
modems functioning goes.  The main advantage to sheilded has been that I can
watch tv or listen to the radio while someones using the modem.

     I don't think there are many drivers that actually conform to the Rs-232
standard so how much stray capacitance is tolerable, how much noise
susceptability exists, is largely a function of individual implementations.
We've got 150+ foot runs at 9600 baud here.

Newsgroups: comp.dcom.modems
From: mk@tron.informatik.Uni-Bremen.DE (Michael Kloss)
Subject: Commonication-Program ????
Organization: Universitaet Bremen
Date: Mon, 28 Sep 1992 10:48:58 GMT


Hi Peoples !

I connect a ZyXEL modem to a Terminal-Server. And a gave it
an own ip number, so i can reach it via telnet.
It works fine for incomming commonication. But a havn't a program
for outgoing transfer. I need a program wich connect me to an ip-addres
and can transfer files whith x- or z-modem.....

Do anybody know such a program ????????????

Please email me : mk@informatik.uni-bremen.de

!! THANX !!
Newsgroups: comp.dcom.modems
From: hm002b@uhura.cc.rochester.edu (hasit mehta)
Subject: ZyXEL U-1496E: Need ARA Script any ideas??
Organization: University of Rochester (Rochester, NY)
Date: Thu, 1 Oct 92 00:10:39 GMT
From: keng@zcar.asd.sgi.com (Ken Greenebaum)
Newsgroups: comp.dcom.modems
Subject: HELP: modem as telephone interface?
Date: 2 Oct 1992 18:36:08 GMT
Organization: Silicon Graphics, Inc.  Mountain View, CA
Distribution: na
NNTP-Posting-Host: zcar.asd.sgi.com
Summary: need old hayes schematics
Keywords: 300 baud hayes schematics

Hi,

I would like to use an old, inexpensive 300 baud modem as the telephone
interface for a home project I am working on.

Basicaly I would like to get audio line levels off of the phone line,
and to be able to inject line level audio onto the phone line. 

In addition, I would like to get incoming ring detect.

I figure that modems must already have the needed circuitry on them.

They already have the isolation transformer, etc. that the phone company 
would want (and I would want to protect myself from the line), plus
a handy ring detector which sends status on a rs232 port, nice off hook
relays, etc.

What could be better?


So:
     1) is this a reasonable approach?
     2) has anybody done this before??
     3) does anybody know the appropriate locations in an old 300b
	hayes smartmodem???
     4) does anybody have a schematic for the old beast????



Thanks for any information!


BTW If anybody is curious.  I would like to interface my home control
    system to the phone line.  I will be able to control aspects of my
    house using voice control.  Additionaly I will have a fancy computerised
    answering machine...   (if things work out)
Newsgroups: comp.dcom.modems
Subject: Re: Supra V.32bis dimensions
From: cybapunk@hovel.welly.gen.nz (Phil Ross)
Date: Sat, 26 Sep 92 09:42:49 +1200
Distribution: world
Organization: The Hovel Bulletin Board System
Keywords: Supra

amc1@cec2.wustl.edu (Adam M. Costello) writes:

> Is the Supra V.32bis the same size & shape as the 2400 series?  That is,
> 6 3/8  x  4 5/8  x  1 1/4   (in)
> If not, what are its dimensions?
> Also, has anyone tried out the new ROMs that are supposed to fix
> everything?  Do they?

Very small.  I'm ordering my new ROM, which is out now, apparently.

Supra V32bis EXTERNAL: 1"x4-5/8"x6-1/2"

--
cybapunk@hovel.welly.gen.nz    X Phil Ross
cybapunk@tornado.welly.gen.nz  X Sysop of The Hovel BBS
cybapunk@sideways.welly.gen.nz X Author of Lords And Ladies, _THE_ BBS door!
     ... If at first you don't succeed, redefine success ...
Newsgroups: comp.dcom.modems
From: gerg@netcom.com (Greg Andrews)
Subject: Re: Need to Transmit Break Key! Supra Help Needed!
Keywords: transmit BREAK sequence modem PC communications
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
Date: Fri, 2 Oct 1992 17:30:53 GMT

In article <6498@otc.otca.oz> rweaver@research.otc.com.au (Richard Weaver) writes:
>
>I also need to transmit the  "BREAK SEQUENCE", from a comms package
>that does not yet know how to do this.
>
>Thus I CANNOT yet  "trigger it with a key";  but I need to begin to !
>
>I'm using the QuickBASIC language, and starting with the Terminal
>Emulator  that is included with the package.  The emulator works;
>and does everything I want, except send BREAK.         I want  to  
>continue using this package,  since  I  have been adding features 
>that I need.
>

Since you mention QuickBASIC, I'm assuming that you're running on an
IBM PC compatible computer.  I don't know how to make QuickBASIC send
a break signal for you, but I can tell you how to make the serial port
hardware send the break signal.

In the IBM PC serial port hardware, you send a break by turning on a
bit in one of the registers in the serial port's UART chip.  You turn
the bit on, wait for a period of time, then turn the bit off.  The
break is sent for the period of time the bit is turned on.  Your program
controls how long the break signal is set.  The longer you wait, the
longer the break signal is sent.

The bit is bit 6 (bits are numbered 0-7, so this is the next-to-highest
bit) of the Line Control Register, which is at the port's base address +3.
For example, with COM1, the base address is 03F8 hex, so the Line Control
Register is at  03F8 hex + 3 = 03FB hex.  Remember that serial ports use
QuickBASIC's I/O port functions, not the memory peek and poke functions.

Read the register's current value, bitwise OR that value with 64,
and write the new value back.  That will turn the Break bit on.
Wait for the amount of time you want the Break signal to last. (70
milliseconds or longer should work for 300 bps and faster speeds)
Then read the register's value again, bitwise AND that value with
191, and write the new value back.  That will turn the Break bit off.

I can't tell you the syntax for writing a QuickBASIC program to do
those things, but it shouldn't be too hard to do.


-- 
 .------------------------------------------------------------------.
 |  Greg Andrews   |       UUCP: {amdahl,claris}!netcom!gerg        |
 |                 |   Internet: gerg@netcom.COM                    |
 `------------------------------------------------------------------'
Newsgroups: comp.dcom.modems
From: rolf@let.rug.nl (R.P. Mulder)
Subject: Re: Is the Supra BBS down?
Organization: Faculteit der Letteren, Rijksuniversiteit Groningen, NL
Date: Tue, 29 Sep 1992 12:48:59 GMT

In article <Bv1zy8.2pB@rice.edu> dgrove@dawn.cs.rice.edu (Dan D Grove) writes:

>It's up, barely.
>I guess my advice would be to try until your modem finally stays
>connected. Rather annoying, overall.

Rather expensive too, if you're calling from Europe :-)

C'u round,
Rolf

 ----------------------------------------------------------------------------
                  Rolf P. Mulder * Computer support division
       Faculty of Arts & Letters, Groningen University, The Netherlands
       E-mail: rolf@let.rug.nl * FIDO: 2:282/600 * Phone: +31 50 635990

       -  Difference between a virus and Windows? A virus never fails -
 ----------------------------------------------------------------------------
                    Disclaimer: I didn't really say this!
From: wbe@bbn.com (Winston Edmond)
Newsgroups: comp.dcom.modems
Subject: Re: ZyXEL Distictive Ring Feature
Date: 3 Oct 92 04:37:53
Organization: Bolt Beranek and Newman, Inc., Cambridge, MA
NNTP-Posting-Host: crystal.bbn.com
In-reply-to: cacclin@fraser.sfu.ca's message of 1 Oct 92 20:30:44 GMT

cacclin@fraser.sfu.ca (Stephen Cacclin) asks:
   The main question I have for now is:
     Can the modem be set to automatically answer calls only on the
     alternate ring...and detect for fax or modem? In other words, I would like
     to have the modem ignore incoming calls on the normal ring.

   Yes, it works.  The feature first appeared in version 4.10; they're now up
to version 5.02.

   As I understand it, there are 4 "distinctive ring" patterns defined for
the North American telephone system.  The ZyXEL modem has four S-register
bits to allow you to specify which ones you'd like it to respond to.  The
autodetection of voice, FAX, or data is completely separate and begins after
the modem has chosen to answer the call.
 -WBE
From: jim@n5ial.chi.il.us (Jim Graham)
Newsgroups: comp.dcom.modems
Subject: USR DS v.32bis 10-15% faster thoughput over the World
Date: 6 Oct 92 02:19:12 GMT
Organization: Me? Organized? Hah! :-)

> In article <BvF8rI.KH7@jwt.UUCP> john@jwt.UUCP (John Temples) writes:
>>
>> I get around 1650 cps when ZMODEM downloading compressed files with my
>> WorldBlazer at V.32bis.  You're saying you get 1800-1900 cps?  I find
>> that VERY hard to believe.  I can't say I recall anyone with any kind
>> of V.32bis modem claiming to get over 1700 cps.

ok, here goes....  I sometimes get a little bit over 1700 cps with
compressed files and Zmodem, but hardly worth mentioning.  as you say,
1650 to 1700 cps is about normal for a fair to average phone line.

now, as for the 1800 to 1900 cps, that pretty much implies that there
is some compression happening....  if you calculate the impact of the
overhead from V.42 or MNP4 (NOTE:  using the formula Toby posted here
one of the last times this debate was in full swing), you end up with
a maximum throughput (before any data compression) of about 1724 cps.
so anything higher than this basically implies compression somewhere.

oh, the above assumes V.32bis with port speed >= 19.2 (I lock mine at
38.4).

then, In article <8256@lee.SEAS.UCLA.EDU> jong@wright.seas.ucla.edu writes:

> If you have a V.42bis modem, you really don't need to use Zmodem
> and waste 50cps or so for double checking errors unless you happened to
> lack 16550AFN uart and your serial port drops characters from time to
> time..

you're confusing apples and oranges here.  V.42bis is a data compression
technique.  Zmodem is a file transfer protocol.  V.42bis in no way
replaces Zmodem.  that 1 or 2 percent overhead for error control is not
made optional by using V.42bis, nor is it made optional by V.42, which
is the modem-to-modem error control underneath V.42bis.  even with a
16550 UART, you can *STILL* have errors on the DTE/DCE link on either
your end or the remote end (which you often have no control over).

if you were to invent some file transfer protocol that used zero error
control (very stupid move), you could not in any way be sure of getting
valid data end-to-end.  the results may not exactly be very benign,
depending on whether you transmitted an archive file with its own error
checking or, perhaps, a program binary that you would just run and hope
for the best......

   --jim

--
#include <std_disclaimer.h>                                 73 DE N5IAL (/9)
------------------------------------------------------------------------------
INTERNET:  jim@n5ial.chi.il.us  |  grahj@gagme.chi.il.us  |  j.graham@ieee.org
ICBM:  41.70N 87.63W                    UUCP:  gagme!n5ial!jim@clout.chi.il.us
AMATEUR RADIO: n5ial@n9hsi (Chicago.IL.US.Earth)    AMTOR SELCAL:  NIAL
------------------------------------------------------------------------------
From: wbe@bbn.com (Winston Edmond)
Newsgroups: comp.dcom.modems
Subject: Re: What ZyXEL to buy (1496E/1496E+/1496S) ?
Date: 27 Sep 92 01:36:42 GMT
Organization: Bolt Beranek and Newman, Inc., Cambridge, MA
NNTP-Posting-Host: crystal.bbn.com
In-reply-to: rcleon@svbs01.bs.win.tue.nl's message of 25 Sep 92 16:20:49 GMT

rcleon@svbs01.bs.win.tue.nl (Leon Oninckx) asks:
> And one last thing which I found odd,
> the German dealers are offering the ZyXELs with 2 years warranty. The
> US dealers give 5. How come? 

   ZyXEL itself, the Taiwanese company, provides only a 2 year warranty, and
you'll see "2" in the documentation that comes with the modem.  Zero/One
Networking, their technical support and rep for the U.S., provides the extra
3 years of warranty.
 -WBE
From: luckey@rtfm.mlb.fl.us (Jon Luckey)
Newsgroups: comp.dcom.modems
Subject: Re: 2400 v.42bis problems !
Date: 25 Sep 92 21:52:55 GMT
Organization: We don't need no stinkin' batches!

isc10192@nusunix3.nus.sg (KOH KHANG WEE) writes:
>I am using a 9600/2400 MNP5 v.42bis Faxmodem.
>I set the comm port at 9600 to effectively realise the compression of
>v.42bis. But when i upload stuff nowadays (I just got the modem
>recently) I get alot of problems !

Compression is all very nice, but to use it you need to recall a few
things.  First, your DTE (Data Terminal Equipment) has to be at
a higher rate than your connection rate.  That part you have.  But
you also have to recall that compression rates are not absolute.

Just because V42bis is advertised to compress 4 to 1, doesn't mean the
modem can squeeze 960plus byte into a data stream that can carry 240.
So when it can't, it tries to buffer the data, in the hopes it can catch
up later.

When when you are sending files that are not as compressible, like ZIP
files, then V42bis cannot compress much further.  Your nodem's buffer
becomes full, and the modem starts to throw away characters, resulting
in errors.

To prevent this from happeneing, you have to provide a way for
the modem to 'flow control' the DTE.  This is usually done by either
the CTS signal in the RS-232 port, or using XON/XOFF.

DSZ supports both kinds of flow control.  But you have to enable it
for your modem.  Unfortunately, the commands for doing this have not
settled down into a well defined standard yet.  Look in your modem
manual.  It should be under AT\Q or AT&K, depending on manufactor.

Since you are in an IBM enviroment, try RTS/CTS control first, and
if that doen't work, try XON/XOFF.  If you use something besides DSZ
to do your sending, remeber that many terminal programs require you
turn on the correct flow control options too.

Good luck.

Jon

(Yeah, I bet this is in a FAQ somewhere, but I haven't seen it yet)
Newsgroups: comp.dcom.modems
From: bill@bilver.uucp (Bill Vermillion)
Subject: Re: taping modem signals
Organization: W. J. Vermillion - Winter Park, FL
Date: Mon, 28 Sep 1992 15:28:26 GMT

In article <1992Sep27.164146.1489@kilowatt.uucp> root@kilowatt.UUCP (Kilowatt admin) writes:

>	I also taped 300 baud with a cassette recorder. I used it to download
>and upload program sources (I had to have my friend originate the call though)
>I don't see why 1200 shouldn't work or even 2400. The cassette recorder has
>a bandwidth that is MUCH higher than the phone line (isn't a phone line only
>3Khz or so?) The recorder should be able to do 100-10000 (let's be reasonable)
>while a GOOD one could do 20-20000. 
>	Is 1200 or 2400 a handshaked or some other strange deal? 300 baud is
>1200 Hz one way, 2400 Hz the other. What about 1200 or 2400? I don't know if
>you could fake a modem into thinking it has a carrier at those speeds...

300 baud is FSK - frequency shift keying.  That is the 1's use one
frequency, the 0's use anohter.

1200 is PSK  - phase shift keying.  Depeding on the PAIR of bits being
tramsitted, the relative phase of the signal is 1) kept the same, 2)
advanced 90 degrees, 3) advanced 180 degress, or 4) delayed 90 degrees
(same as a 270 degree advance).

Because of the electro-magnetic characteristic of tape, keeping these
transitions clean and recoverable will be much harder.   The phase
shift are large discrete jumps and the magnetic interface will smear
those.    Look at a digital signal recorded on an analog machine.  All
the square pulses are severly rounded, and have to be clipped to
restore them to digital pulse.

That being said, I have not tried recording 1200bps interface signals,
and it may work - but the better the recorder, the better your chances.



-- 
Bill Vermillion - bill@bilver.oau.org  bill.vermillion@oau.org
                - bill@bilver.uucp 
                - ..!{peora|ge-dab|tous|tarpit}!bilver!bill

Newsgroups: comp.dcom.modems
From: mac1@Ra.MsState.Edu (Mubashir Cheema)
Subject: Re: Best Supra Prices?
Organization: Mississippi State University
Distribution: usa
Date: Tue, 29 Sep 1992 07:19:25 GMT

gomez@enuxha.eas.asu.edu (JL Gomez) writes:

>I'm ready to buy a Supra V.32bis/FAX modem using my credit card.

>Who's got the best price in the USA? Especially no surcharge on cards.

>Thanks!
>--
>gomez@enuxha.eas.asu.edu


 Hi Gomez,
	  I have 'THE BEST PRICE' on Supra V.32bis faxmodem in USA. 
 Do you know anybody who can beat $265 for modems with the latest 1.2J ROM ?
 
 Thanx.
Mubashir.

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Mubashir Cheema: Computer Engineering student at Mississippi State University.
Amiga User and Star Trek Fan (me too :)
I can be reached at Fax/phone : (601) 324-7324 
US mail  : PO Box 4887, MSU             UPS/FedEx: Greentree T.H. # 33D 
           MS State, MS 39762-4887                 110 Lynn Lane  
                                                   Starkville, MS 39759 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Bolling's Postulate:
              If you're feeling good, don't worry. You'll get over it.