HDTenEightyP/NetNews huggingface dataset:
From: geoff@zswamp.UUCP (Geoffrey Welsh)
Newsgroups: comp.dcom.modems,comp.sys.ibm.pc.hardware
Subject: Re: Help on upgrade to 16550A UART
Date: Tue, 21 Jul 92 23:06:08 EDT
Organization: Izot's Swamp

scott@mycro.UUCP (Scott C. Sadow) writes:

>    There is only 1 reason to replace a 8250/16450 with a 16550A -
> interrupt latency.

   I'm usually the first to say something like that, but there is one more 
advantage (however slight): you can set the receive interrupt to trigger at 
certain FIFO buffer fill levels, allowing a single interrupt to read up to 16 
bytes and in stead of one interrupt per byte, lowering the CPU overhead of 
going into and out of interrupt service code.  Similarly, you can write 16 
bytes on a transmit hold buffer empty interrupt in stead of just one, with 
similar gains.  So, the per byte average CPU overhead is lowered... on 
multitasking systems you can sometimes feel the difference while high-speed 
transfers are underway and, on single-task systems, you can sometimes measure 
small increases in performance, not to mention that the CPU has more time to 
write incoming data to the screen while it's still pouring in the port, giving 
another small but perhaps measurable increase in the speed of applications.

>    My experience has been that a 12 Mhz 80286 is just barely fast enough
> to be able to receive characters at 115,200 baud. At this baud rate, the
> PC is handling roughly 11,520 interrupts/second, so the interrupt handler
> has to be very small and tight.

   Utilities like LapLink, FastLynx, etc. use polled, not interrupt-driven, 
mode to do 115 kbps.  Of course, you can only get away with this on single-
task systems. 

> Also, any program that switches the 80386/80486 into protected mode and/or 
> virtual 8086 mode will increase the interrupt latency (EMM386 does this)

   That's not half as bad as an AT-compatible 286 switching from protected to 
real mode (i.e., after an extended memory access under DOS); the CPU is 
actually reset, and that doesn't happen in a single clock cycle. <grin>

>    Should you replace you current UART with a 16550A? I would only do so
> if you are seeing problems like reduced throughput and/or high error rates.

   I'm with you 100% on that!

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
Newsgroups: comp.dcom.modems
Subject: Re: What's the supply for Supra Fax v32bis?
From: Steve.Withers@bbs.actrix.gen.nz
Date: Sun, 26 Jul 1992 12:51:13 GMT
Organization: Actrix Information Exchange

In article <1992Jul26.015148.8165@news.cs.brandeis.edu> st901745@pip.cc.brandeis.edu writes:
> My SupraFax uses 9V AC (I assume 60 cycles since I am in the U.S. but
> I bet it does not mind 50 cycles).
> -Alastair
> st901745@pip.cc.brandeis.edu

This modem uses 9VAC/600 milliamps - the international version comes with a
9VAC/1 amp power pack. I haved both the 9vac/600 milliamp unit - with a
220-110 stepdown transformer AND a 9VAC/1 amp unit made locally. 
 
It may be coincidence, but after leaving it on all night while on the 
9VAC/1 amp unit  -  the speaker has become marginal. Some times it works fine
- other times it has a fair bit of distortion - and other times it doesn't
work at all. The modem is apparently unaffected by this in terms of its main
function.
 
The power may have nothing at all to do with it.
 
Steve

-- 
Steve Withers - Wellington, New Zealand | "But the glory kept shining
Steve.Withers@bbs.actrix.gen.nz         |  and bright in my eyes, 
withers_s@kosmos.wcc.govt.nz            |  And the stars going round in 
**** Happy user of OS/2 v2!! ****       |  my head." R. L. S.
From: wtm@uhura.neoucom.edu
Newsgroups: comp.dcom.modems
Date: 18 Jul 92 10:36 MDT
Subject: Plus Plus Plus
Nf-ID: #N:1992Jul18.063614.12356@uhura.neo:-378695629:001:367
Nf-From: uhura.neoucom.edu!wtm    Jul 18 10:36:00 1992


By the way, persons discussing the Hayes patent should probably be
careful to not include the deadly three plus signs in a row as
embedded text in their news articles.  :-) :-) :-) :-)....


(For obvious reasons!)



-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu   (140.220.1.1)

Newsgroups: comp.dcom.modems
From: kc@netcom.com (Dameon D. Welch)
Subject: Re: PPI14400FXSA-- Mac fax software, ROM upgrades
Date: Mon, 27 Jul 92 01:27:47 GMT
Organization: Wayne's World, Inc -- NOT!

In article <1992Jul26.212232.1829@newross.Princeton.EDU> dem@cs.Princeton.EDU (Doron Meyer) writes:
>Two questions about the Practical Peripherals PM14400 external w/ Fax:
>
>1) I've heard mention of a beta version of the Mac fax software, but I've
>lost the instructions on how to obtain a copy.  Could someone either
>repost them or send me a copy in mail?

You can call Smith Micro at 714-964-9316. I have yet to do so as I have no
real need to use the Fax part of my modem (yet).

>2) How does one get a ROM upgrade.. are they free and you just have to
>bug PPI, or do they charge you? 

I called PPI's tech support. They (as promptly as possible) shipped me
out a new ROM free of charge, no hassles. The current ROM is 1.12c,
which I now have. Fixed the "loud" modem speaker and fixed 1200 baud
connections. Not a bad deal.

-- 
   Dameon Welch      Santa Clara University Design Center      kc@netcom.com
                    Help, I'm trapped in a .signature file
Newsgroups: comp.dcom.modems
From: tad@ssc.wa.com (Tad Cook)
Subject: Re: Infotel V.32bis Fax/Modem
Organization: very little
Date: Thu, 30 Jul 1992 04:40:24 GMT

In article <1992Jul27.181851.11668@Princeton.EDU> bertoldi@macondo.Princeton.EDU (Frank Bertoldi) writes:
>Does anyone have anything to say about the MidWest Micro
>Infotel V.32bis Fax/Modem which sells for $269 (ext) and thus
>appears to be the cheapest 32bis modem on the market -
>unless someone can point to a cheaper one.
>
>It has V32bis MNP5 V42bis etc, group 2+3 V.29 fax, 7 yrs 
>warranty.
>


Midwest just shipped me the GVC model, which is all they had in
stock last week.  They claim that GVC/Infotel/Zoom are all
clones of each other.

I just got it running today.  No problems connecting to a Trailblazer,
Worldblazer, USR HST, and whatever MCI Mail is using on their new
9600 bps service.  But so far I can't get the computer and modem
to talk to each other faster than 9600, and when talking to MCI Mail
it does not seem to error correct.  I also am unable to connect
with any 2400 bps modems.  I talked to two folks at Midwest's
tech support number today, and all they could suggest was using
default parameters for initialization.  The fax works fine with
the Quicklink2 software they provided.

I did install a new I/O board with a 16550 UART from R&S Data,
as recommended by some folks on this newsgroup.

Still waiting to hear back from those folks at Midwest....I
would like to find some other initialization string (other than
AT&F) that might help me.


-- 
 Tad Cook     |  Phone:  206-527-4089  (home)     |   MCI Mail: 3288544   
 Seattle, WA  |  Packet: KT7H @ N7DUO.WA.USA.NA   |   3288544@mcimail.com 
              |  Internet: tad@ssc.wa.com        or...sumax!ole!ssc!tad
From: dohle@vax2.concordia.ca (Gordon Dohle)
Newsgroups: comp.dcom.modems
Subject: Prometheus MaxFax and MacTCP conflict
Date: 25 Jul 92 07:12:00 GMT
Organization: Concordia University
News-Software: VAX/VMS VNEWS 1.41


 I find I cannot run MacTCP without removing the
            MaxFax init from the system folder. When I try to
            do a connect using Versaterm's MacSlip, all I get
            is a beep until the MaxFax init is removed.

            Anyone know of a solution?


            Gordon
            Dohle@vax2.Concordia.ca
Newsgroups: comp.dcom.modems
From: vladimir@intrepid.intrepid.com (Vladimir Vukicevic)
Subject: Using SLIP w/PEP on T1000
Organization: Intrepid Technology, Inc.
Date: Tue, 28 Jul 1992 18:04:17 GMT


I have a T1000 (I'm going to [hopefully] get a V.32 9600 modem soon..) and I
would like to use PEP for slip. When I do ZModem transfers, I get about
1000 cps average... BUT when I use slip, it's ssslllooowww. If I connect using
2400 baud, it speeds up visibly. What am I doing wrong?

						Vladimir
From: craig@Veritas.COM (Craig Harmer)
Newsgroups: comp.dcom.modems
Subject: Re: Telebits and TIES (was: Re: Boom! Our lawyer are tougher...)
Summary: back to connect, but it prints a message
Date: 28 Jul 92 04:59:43 GMT
Organization: VERITAS Software

In article <BrvJ17.99x@jwt.UUCP> john@jwt.UUCP (John Temples) writes:
>"An escape sequence contains three consecutive escape characters [...]
>followed by a valid AT command.  For example, [...] +++ATH"
>
>Contrast this with the T3000's description:
>
>"An escape sequence contains three consecutive escape characters [...]
>separated from other characters by a guard time [...]"
>
>The WorldBlazer behaves as documented in its manual, but it also
>behaves in the manner described in the T3000 manual with the
>"enhancement" of going back online if no valid AT command is detected.

yes, but it also prints a message

CONNECT 14400/COMP

when it goes back to the connection.

i somehow enabled the escape code stuff, and got these messages in
the middle of reading my mail (using ``+'' to page through the
email).  it took me awhile to figure out what was going on.

the ``+ + +'' thing, with or without a guard time, is a gross,
unreliable hack.  i can't see why anoyone would brag about a
misfeature like this.

the closest i've come to using it is this:  i use break to drop
me into command mode when debugging.  the only problem is that
there's no command to generate a break from command mode (if you
really wanted to send a break).

				craig



-- 
{apple,amdahl}!veritas!craig				craig@veritas.com
(415) 626-6827 (h)					(408) 727-1222 x220 (w)
	[views expressed above aren't Veritas' views, nor should 
	they be mistaken for the views of any responsible person.]
From: swinokur@pbs.org
Newsgroups: comp.dcom.modems
Subject: Re: Zyxel - which Buadrate?
Date: 21 Jul 92 14:19:52 EDT
Distribution: world
Organization: PBS:Public Broadcasting Service, Alexandria, VA

In article <14142rINNa66@iraul1.ira.uka.de>, S_SCHORR@iravcl.ira.uka.de (|S| Roland Schorr) writes:
> Hello, All out there!
> 
> Someone told me, that the Zyxel now would make more then 14.400 with the new
> ROM-Release.
> 
> Can anyone tell me, how much baud this is? which Baudrate do I get with zmodem?
> (CPS-Rate)?
> 
> 
> Greetings, Roland
> 
> P.S.: Please reply direct to me, I'll post then _real_ news.

Roland, it's 16.8k. It is in beta right now. It is very sensitive to line noise.
I have not yet made a releiable connection to test it out. It drops back to 14400
00. I will be able to test it locally after I drop the new eproms in my brother's Zyxel so we can test
machine so we can test it out. It will only talk to another Zyxel at this speed.


Stu Winokur
Xref: sparky comp.dcom.modems:11346 comp.sys.ibm.pc.hardware:20550
From: a9@public.BTR.COM (Ashar Nisar)
Newsgroups: comp.dcom.modems,comp.sys.ibm.pc.hardware
Subject: worldblazer for Very Long distance transfer?
Date: 29 Jul 92 01:17:38 GMT
Followup-To: comp.dcom.modems
Distribution: na
Organization: BTR Public Access UNIX, MtnView CA. Contact: Customer Service cs@BTR.COM

does anyone have experience in transfering data with PEP worldblazer
modems to the countries on the other side of the globe?

what effective transfer rate do you achieve? and given many
options in Worldblazer (MNP, V.42, etc) what settings (compression,
error-correction, word size, baud rate) give the best results?

thanks 

-ashar
a9@btr.com


Newsgroups: comp.dcom.modems
From: zxmgn01@mailserv.zdv.uni-tuebingen.de (Philipp Knirsch)
Subject: Re: Connecting Supra to Supra
Organization: Comp. Center (ZDV) U of Tuebingen, FRG
Date: Tue, 21 Jul 1992 15:51:26 GMT

In <H.znI1RX&z5Bk@mips.ruessel.sub.org> naddy@mips.ruessel.sub.org (Christian Weisgerber) writes:

>In <OD.6badnetOA92-901-302p0_4bc3b8aa@piraya.bad.se>, Roger Nordin writes:

>> But not USR V.32bis/ASL modulation. It is far superior to HST in all cases of 
>> bad lines I've experienced so far.

>Not at all. In my experience USR V.32bis easily drops down to 7200 or
>such when HST stays up at 14400 or 12000. The USR<->USR flavor of
>V.32bis is superior to plain CCITT V.32bis, though.


>bye
>-- 
>Christian 'naddy' Weisgerber, Germany           naddy@mips.ruessel.sub.org

Thats one of the common things all USR users say, but i have now seen a lot
of USR users around, and the big prblem with the USR is that you CAN`T
actually say what speed you are driving. This is not so with those new modems
like the Supra where your speed is shown on the display.

And when you call e.g. to the USA from germany, i usually get better cps with
my supra than my friend with his HST. His ARQ (or was it ASL?!) light flickered
and did`t stop, and often he got just about 200-300cps, and that never ever
happend to me with my supra. It can be that my supra drops down to 4800 (
often with some help of me sothat it doesn`t drop carrier, but thats probably
a software problem which is to be solved in one ROM update that follows),
and with this i got about 500-600 cps using V.42bis.

Thats the way it goes with me and my friends and i can surely only tell MY OWN
experiences.

So don`t flame me if you had over ones.

Read ya, Phil

--
  ~~~~~~~   "And even if you think you are at the bottom, something else
 (~ O O ~)   happens which makes everything even worse."
  |  >  |   Philipp Knirsch, Peter-Imhoffstr. 57 7402 K-furt, Germany
  \ \_/ /   email: knirsch@mailserv.zdv.uni-tuebingen.de
From: jimb47@netcom.com (Jim Budler)
Newsgroups: comp.dcom.modems
Subject: Re: Telebit Qblazer <-> T2500, anyone?
Date: 24 Jul 92 00:38:34 GMT
Organization: Netcom - Online Communication Services (408 241-9760 guest)

In article <7#hmvwg.jimb47@netcom.com> jimb47@netcom.com (Jim Budler) writes:
>
>I can't cast any light on QBlazer to T2500, but I'm logged on to a
>WorldBlazer right now using a QBlazer, if that helps at all.
 ^^^^^^^^^^^
		   |_ make that a T3000 right now. But I also have successfully
		   completed UUCP connects to a WorldBlazer.
>
>jim
>

Sorry for the extra waste bandwidth.
-- 
Jim Budler

also jimb@silvlis.com and 72415.1200@compuserve.com
Newsgroups: comp.dcom.modems
From: jvmg9796@uxa.cso.uiuc.edu (Doc)
Subject: Re: USR vfast
Organization: University of Illinois at Urbana
Date: Tue, 21 Jul 1992 22:09:09 GMT

Question for anyone who knows:  The Dual Standards currently have HST and
v.32bis protocols in them.  When the v.FAST upgrade is available, will
the modem then become a "Tri Standard"?  If not, which one gets yanked out,
v.32bis or HST?  Or will v.FAST be backward compatible with v.32bis?
From: jimb47@netcom.com (Jim Budler)
Newsgroups: comp.dcom.modems
Subject: Re: Telebit Qblazer <-> T2500, anyone?
Date: 24 Jul 92 00:32:49 GMT
Organization: Netcom - Online Communication Services (408 241-9760 guest)

In article <1992Jul17.142123.18584@huracan.c> hope@huracan.cr writes:
>
>I'm interested in buying a QBlazer or two, and would like to know if anyone
>has had problems getting the QB to connect to a T2500 in V.32 with
>V.42/V.42bis.   I'm asking because, as many of us know, there are some
>incompatibilities among different Telebit modems.  (I can't, for example,
>get my T1600 to do uucp spoofing with a T2500, and T'bit acknowledges this
>as a bug which will probably not be solved anytime soon.)

I can't cast any light on QBlazer to T2500, but I'm logged on to a
WorldBlazer right now using a QBlazer, if that helps at all.

jim

-- 
Jim Budler

also jimb@silvlis.com and 72415.1200@compuserve.com
From: bourman@hpcc01.corp.hp.com (Bob Bourman)
Date: Wed, 22 Jul 1992 21:41:22 GMT
Subject: Re: Looking for RS-366 to RS-232
Organization: the HP Corporate notes server
Newsgroups: comp.dcom.modems

/ hpcc01:comp.dcom.modems / jimmy_t@verifone.com /  4:29 am  Jul 17, 1992 /
I'm looking for an RS-366 to RS-232 converter.
The RS-232 output can be any reasonable format (for example: Hayes AT commands)

I would be grateful for any leads.

Thanks
-- 
Jim
+------------------------------------+--------------------------------------+
|  James H. Thompson                 |   jimmy_t@verifone.com    (Internet) |
|  VeriFone Inc.                     |   uunet!verifone!jimmy_t  (UUCP)     |
|  100 Kahelu Avenue                 |   808-623-2911            (Phone)    |
|  Mililani, HI 96789                |   808-625-3201            (FAX)      |
+------------------------------------+--------------------------------------+
----------


	RS366 or RS366A (V.25)?

	Several 208B modems support RS366 auto dial feature. You can use
	an 801 auto dialer (366) with a 208B modem or 9.6 modem. Some
	9.6 modems support RS366 as well. V.25 is an auto dialer for Sync
	data (IBM etc...).

	Try GDC 801/802  Racal (Vadic) 9632VP or 4850VP 

	BOBB


Newsgroups: comp.dcom.modems,can.uucp
From: Ross Ridge <ross@zooid.guild.org>
Subject: Re: UUCP 'g' vs. MNP & V.42
Organization: ZOOiD BBS
Date: Fri, 24 Jul 1992 05:21:07 GMT

peters@beltrix.guild.org (Peter Sleggs) writes:
>I use USR V32bis for my uucp connections and I have no end of trouble
>with T2500's that have MNP enabled, but otherwise they work OK. uunet.ca
>has worldblasers and they seem to work just fine.

Ross Ridge <ross@zooid.guild.org> writes:
>ZOOiD's T2500 has MNP enabled, at least it should.

woods@eci386.uucp (Greg A. Woods) writes:
>On the other hand, you do want to *allow* (but not force) MNP for
>dial-up, in case it's a human, or co-operating protocol like SL/IP.

This is how ZOOiD's T2500 should be setup.  Mind you I'm not sure if
it actually is.  All I know is we're not forcing MNP.

>BTW, so far as I know, the V.42bis compression protocol is quite
>useful in conjunction with UUCP 'g', especially on a modem that does
>local spoofing of the 'g' protocol (such as the T-2500).

I've seen no benefit from using either v.42 or v.42bis with UUCP.
The T2500 won't spoof with v.42.

							Ross Ridge

-- 
Ross Ridge - The Great HTMU					     l/	 //
								    [OO][oo]
ross@zooid.guild.org						    /()\/()/
uunet.ca!zooid!ross						     db	 //
From: geoff@zswamp.UUCP (Geoffrey Welsh)
Newsgroups: comp.dcom.modems
Subject: Re: How to configure fall back character ?
Date: Sun, 26 Jul 92 15:50:34 EDT
Organization: Izot's Swamp

jan@janhh.hanse.de (Jan Willamowius) writes:

> I've got a 14400bps modem with the Rockwell chipset. People are giving me
> different advice on how to set the "auto-reliable fall back character".
> Some say %A should always be 0 others say 13 and the manual doesn't really
> say anything.
> 
> Maybe somebody can explain what chacacter to use in what circumstances.
> What effect does it have ?

   When trying to establish a connect, your V.42-equipped modem will prompt 
the other for an error correcting link; normally, it will wait a couple of 
seconds before giving up and returning to a normal link.  However, if your 
modem receives the fallback character before the timeout, it will give up 
right away rather than wait.

   That said, it should probably occurr to you by now that there are very few 
connections where a properly tuned fallback character accomplish anything, and 
fewer still where it has a life or death effect on the connection.  Still, 
it's good to know it's there if you're worried about missing critical 
information sent by a non-V.42 modem as soon is it sees a CONNECT, while your 
modem is still sending the V.42 prompt codes and waiting for an answer.

   You might also look at the setting which controls what your modem does with 
the data it receives while waiting for the other modem to respond to the V.42 
and MNP prompts; the default is to discard it.

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
Newsgroups: comp.dcom.modems
From: sanjay@saathi.ncst.ernet.in (Sanjay H Pathak)
Subject: V.32bis connection between T3000 and Codex-Motorola 3266
Organization: National Centre for Software Technology, Bombay, India.
Date: Wed, 29 Jul 1992 15:33:55 GMT

We have a Codex-Motorola 3266 modem which can operate in V.32bis.  Our
connection to Internet is thru UUNET Technologies. We have attempted
connecting this modem  in  the 4-wire leased line mode to a Telebit
T3000 modem at the other end in V.32bis. From the LCD panel of our
modem we have observed that while negotiating an error-correcting
connection, our modem receives a retraining request from the T3000
modem.  So both modems begin retraining, and the connection negotiation
starts from the beginning. The retraining request is sent by the T3000
even though it is disabled on the modem. This continues and the modems
fail to establish a connection.

The noise level on the line has been measured by our colleagues at UUNET
and they feel that it is at a level that should not hamper both modems
to establish a V.32bis connection.

We request suggestions and/or ideas to make this V.32bis connection
work.

Our physical connectivity is as follows: From Bombay we are 4-wire upto
ITMC, New York. From there the circuit is two wire upto UUNET. 

sanjay@saathi.ncst.ernet.in
(Sanjay H. Pathak)
From: mauricio@MOZART.AERO.UFL.EDU
Newsgroups: comp.dcom.modems
Subject: Help on Apple modem switches
Date: 23 Jul 92 13:20:42 GMT


	Recently, I got an Apple 1200 baud modem.  Since the previous
owner lost its manuals, I have no information about how to set it up. 
For instance, there are three switches in its back that I have no idea
how to set them.  Any suggestions?
From: dohle@vax2.concordia.ca (Gordon Dohle)
Newsgroups: comp.dcom.modems
Subject: Re: 14400 modems/fax recommendation
Date: 29 Jul 92 22:40:00 GMT
Organization: Concordia University
News-Software: VAX/VMS VNEWS 1.41

In article <1369@yetti.UUCP>, frank@cs.yorku.ca (Frank Pikelner) writes...
>I've not been reading this news group for several weeks now, and I've just
>been asked to recommend a manufacturer for a university modem-fax purchase.
>The feautures are for the modem V.32bis, and for the fax send/receive 14400.
>Since this is not my area of expertise, I would appreciate any comments,
>experiences, warnings, etc.
> 
>My thanks to all,
>-- 
> 
>--------------------------------------------------------------------------
> ---  ---    Frank Pikelner                                          /~\
> \    \  \   Technical Assistant, Department of Computer Science    <v.v>
>  \-   \--   York University (Toronto, Canada)                      ,\^/;
>   \    \    Internet: frank@cs.yorku.ca                            _{!}_
>--------------------------------------------------------------------------

I'd recommend the Prometheus Ultima.


Gordon
Dohle@vax2.Concordia.ca