HDTenEightyP/NetNews huggingface dataset:
From: reb@Ingres.COM (Phydeaux)
Subject: Re: SHOCKING STORIES
Reply-To: reb@Ingres.COM (Phydeaux)
Organization: E 4th St Home For The Overeducated Underemployed - Chicago Div.
Date: 19 Aug 92 17:19:15 GMT

In article <1992Aug18.123702.9035@tpl68k0.tplrd.tpl.oz.au> keithh@tplrd.tpl.oz.au (Keith Harwood) writes:
>
>In article <1992Aug13.200613.23247@bnlux1.bnl.gov>, schroede@bnlux1.bnl.gov (gary l. schroeder) writes:
>> In article <1992Aug12.193416.25072@pony.Ingres.COM> reb@Ingres.COM (Phydeaux) writes:
>> 
>> >A housemate in college used this technique to 'drink' liquid nitrogen.
>> >He put  it  *into*  his  mouth and  as  it started down his  throat it
>> >expanded  and vapor  came  gushing out of his  nose  and mouth!  Quite
>> >an impressive trick for parties!
>> >					reb
>> 
>> Working with LN2 myself on a daily basis, I'm forced to wonder "how did
>> he avoid suffering frostbite on his tongue, etc.?"  While most of the
>> liquid will go gaseous, some must first come in contact with exposed
>> oral flesh.

I think he  relied on the LN2 riding  on top of  gasseous N2 ... above
his tongue,  throat, etc., or  perhaps he did  it  by putting a little
saliva on his tongue  first... If you  *really* want  me to  find  out
e-mail me and I'll e-mail him...
					reb
From: bortnick@iccgcc.decnet.ab.com
Newsgroups: sci.electronics
Subject: Need Help With Fields
Date: 14 Aug 92 15:11:22 EST



 I am trying to model the fields that are generated by high current
 and voltage transmission lines. I am not sure if a long transmission
 line should be modeled like a dipole antenna for example, when trying
 to calculate the E and B fields. I am trying to make a reasonable
 suggestion to one of our customers about how close they can route their
 power line to our equipment. We test our equipment against radiated E-fields
 of 10 Volts per meter. The customer's power line is 120V and 5000A
 continuous AC current. Any suggestions would be greatly appreciated.

 Thanks in advance,

 Dan Bortnick

 Allen-Bradley Corp.
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Sound-powered telephones
Date: 18 Aug 92 03:17:48 GMT
Organization: University of Georgia, Athens

In article <Bt5Gry.871@usenet.ucs.indiana.edu> commgrp@silver.ucs.indiana.edu (BACS Data Communications Group) writes:
>You can make sound-powered telepones from "piezoelectric speaker 
>elements" available at Irish Electronics (Ray D. O'Shack :-), part # 
>273-091 ($2.49).  Just connect one to each end of a pair of wires.  
>It's a great toy for kids, and may have "real" applications too.

I'll bet they would also make excellent high-impedance earphones for
crystal radios.
-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - don't tie education to an unpredictable income.
Newsgroups: sci.electronics
From: rkh@wpi.WPI.EDU (R Kurt Heinzmann)
Subject: Re: Care and Feeding of NiCd batteries (was Re: How to dispose of NiCads?)
Organization: Worcester Polytechnic Institute
Date: Wed, 12 Aug 1992 13:41:26 GMT

In article <1992Aug11.183613.11362@ntg.com> dplatt@ntg.com 
(Dave Platt) writes [the best summary of practical NiCd care I have seen].
With regard to overcharging:

>
>According to what I've read, in battery-manufacturer literature, it is
>safe to discharge _individual_ cells all the way down to zero.  It's
>usually unnecessary to do so, but it can be advantageous in some
>occasional cases... a full discharge of a cell to zero will cure
>"voltage depression", which can occur if a cell or battery is
>overcharged (left in the charger for too long).
>

The constant-current discharge curve of a cell that has been overcharged
is nearly flat at around 1.2V until it hits the depression of 150mV.  The
curve remains flat at around 1.05V for the rest of the discharge.  The 
longer the overcharge, the sooner the depression begins.  Does anybody
know what amount of overcharge corresponds to full depression or, say,
half (depression occurring halfway through the discharge time)?

>
>You can avoid overcharging by taking the batteries out of the charger
>when they've been fully charged.  If you need to keep NiCd batteries in
>a "floating" application... if they must be be kept constantly "topped
>up" to full charge without human intervention... then you should use a
>charger which is intelligent enough to switch to a low-rate trickle
>charge once the battery is full.  I believe that a trickle-charge rate
>of about C/1000 or so (e.g. 1 milliampere, for a 1000-milliampere-hour 
>battery) is in the right ballpark - it will compensate for the battery's
>rate of self-discharge.
 
Panasonic recommends a trickle charge of between C/30 and C/20.

----
Kurt Heinzmann
Newsgroups: sci.electronics
From: jon_sree@world.std.com (Jon Sreekanth)
Subject: Re: Books on IBMPC hardware internals
Organization: The World
Date: Wed, 19 Aug 1992 17:02:37 GMT

In article <1992Aug19.093523.2245@csqx.cs.rhbnc.ac.uk> adrian@csqx.cs.rhbnc.ac.uk (A Johnstone) writes:


   I'm trying to gather a comprehensive list of books and other material on the PC.
   I DON'T mean those books that tell you what a hard disk is, and how to fit an
   expansion card. I am interested in real circuit and timing information, and
   system software books that cover the details of interrupt and DMA handling. It


- Programmer's Problem Solver for the IBM PC, XT and AT, Robert Jourdain,
Brady Book, 1986 (maybe a newer edition around), ISBN 0-89303-787-7
Published by Prentice Hall Press, NY

Not much bus detail, but lots of info on timer, keyboard, video, disk,
parallel and serial port hardware resources, and software interfacing.

- AT Bus Design, Ed Solari, Annabooks, ISBN 0-929392-08-6
$69.95; Annabooks is at 619-271-9526

Bus timing and specs, all the gory details. ISA and EISA.

/ Jon Sreekanth

Assabet Valley Microsystems, Inc.           |  Fax and PC products
5 Walden St #3, Cambridge, MA 02140         |  (617) 876-8019
jon_sree@world.std.com                      |
Newsgroups: sci.electronics
From: stirling@mullet.gu.uwa.edu.au (Stirling Hamersley)
Subject: Oversampling, Dig. Filtering and DAC's
Organization: University Computer Club --- Perth, Western Australia
Date: Mon, 17 Aug 1992 04:04:24 GMT

I am building a sound card for my PC (much more fun than buying one)
and I am wondering how to get really good sound quality.

The card and computer will be dedicated to playing sound (as its not so
I can have really good sound just to play games) so it should be able
to provide data at a rate of 176.4 words per second to the 16bit DAC.

How do CD players do their over sampling ? Do you have to use a DSP ?

How Do they do their Digital Filtering?

While suppling the data the the DAC there is a small amount of time 
where the output drops to zero while the FIFO that supplies the data
is in transition to the next word (about 300 ns). 
Will a filter remove and this glitch ?
Or should I use a store and hold amp ?
Or would it be easier to use two 74LS373's ( trans. octal latch ) ?
BURR BROWN suggest passing the final output through a low pass filter anyway.
What is a good low pass filter ?

The prototype board I am wire-wrapping on has a ground plane so I hope
this will shield some of the noise.
What sort of problems can I expect to encounter with noise and how
can I overcome it?

Oh so many questions.  But then I am only one of those ignorant programmers
who does not wade to deeply into the unknown depths of analog electronics.

Thankyou for you time.

"You can't know everything until you know you can't know everything"
                                                      - Hamersley.

Newsgroups: sci.electronics
From: wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)
Subject: Re: LOAD DUMP? automobiles
Reply-To: wb8foz@skybridge.scl.cwru.edu (David Lesher)
Organization: NRK Clinic for habitual NetNews abusers - Beltway Annex
Date: Sun, 23 Aug 92 00:30:34 GMT

Others said
# I am building a 12 volt circuit for an automotive application and would like
# to understand how a Load Dump could harm my circuit.
# Can any one help me?

The GE MOV Handbook, or Design Notebook, or whatever it is called,
discussed it in detail. As I recall, it talked about 65 volts, and
mucho milliseconds, during a load dump, but my memory is subject to
damage from load dumps ;_]
--
A host is a host from coast to coast..wb8foz@skybridge.scl.cwru.edu
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
From: pvr@wang.com (Peter Reilley)
Newsgroups: sci.electronics
Subject: Re: PD schematic capture, layout and route?
Date: 12 Aug 92 14:04:27 GMT
Organization: Wang Labs, Lowell MA, USA

rcain@netcom.com (Robert Cain) writes:


>Is there a public domain or sharware schematic capture and/or layout and/or
>routing package for the PC?

	There is a fully functional schematic and PCB layout package
available on simtel20.   It is freeware from PADS software.   It
is limited in the size of design that you can create, 10 - 15 IC's
seems to be about it.

	Here is where to get it;

These files are available via anonymous FTP from WSMR-SIMTEL20.ARMY.MIL
(192.88.110.20) or mirror sites OAK.Oakland.Edu (141.210.10.117),
wuarchive.wustl.edu (128.252.135.4), ftp.uu.net (137.39.1.9),
nic.funet.fi (128.214.6.100), src.doc.ic.ac.uk (146.169.3.7) or
archie.au (139.130.4.6), by e-mail through the BITNET/EARN file
servers, or by uucp from UUNET's 1-900-GOT-SRCS.  See UUNET file
uunet!~/info/archive-help for details.

Directory PD1:<MSDOS.CAD>

PADSLIB.ZIP   B  488615  920212  PADS library for PADSPCB.ZIP and PADSLOG.ZIP
PADSLOG.ZIP   B 1081636  920212  PADS Logic schematic capture CAD program
PADSPCB.ZIP   B 1036461  920212  PADS PCB (printed circuit board) layout pgm

-- 
>>>>>>>>>>>> Peter Reilley ..... pvr@wiis.wang.com ..... KA1LAT <<<<<<<<<<<<<
                     Well, that about says it.
Newsgroups: sci.electronics
From: grimaldo@tokyo.seri.philips.nl (Emilio Grimaldo)
Subject: Low Power RF module
Keywords: Low Power, RF
Organization: Philips Semiconductors, The Netherlands 
X-Newsreader: Tin 1.1 PL4
Date: Tue, 18 Aug 1992 13:00:27 GMT
Expires: Sun, 30 Aug 1992 12:00:00 GMT

Hi,
    I am currently looking for a LOW POWER RF module (a set of 2 for base and
remote unit) such as those used in cordless telephones, here are the specs.
	 Channels: Preferably 20, more is o.k.
	 Frequency band: could be 46MHz, 49MHz or 900MHz
	 Other: RSSI output helpful

As you see the requirements are very flexible, almost anything will do but it
has to be cheap! Please email at the address below.
	  Thanks in advance,
			   Emilio Grimaldo

--
NAME:    D. Emilio Grimaldo T.                      _/_/_/_/                    
EMAIL:   grimaldo@tokyo.sce.philips.nl           _/_/_/                         
ADDRESS: PO Box 218,BE-540,5600 MD Eindhoven      _/_/_/_/                      
------------------------------------------------------------------------------
     * * PERSONAL OPINIONS AND THEREFORE NOT REPRESENTING MY EMPLOYER * *
------------------------------------------------------------------------------
"Earth's largest project is also going wrong: humanity..." -me
"To love is to smell the fragance of a soul's inner beauty..." -me
From: rkarlqu@hpscit.sc.hp.com (Rick Karlquist)
Newsgroups: sci.electronics
Subject: Re: Teledeltos Electric Field Paper?
Date: 12 Aug 92 16:34:24 GMT
Organization: Hewlett-Packard, Santa Clara, CA

In sci.electronics, kevins@hpspdla.spd.HP.COM (Kevin G Smith) writes:

> Hello,

> Does anyone know if Western Electric still makes "Teledeltos" paper or
> if there is an equivalent on the market?  You may recall that this
> special paper allowed one to cut, model, and measure electric fields in
> the days before practical computers [example reference: _Test and
> Measurement World_, August 1992, p. 27.]

> *******************************************
> * Kevin G. Smith                          *
> * Phone: (415) 857-3423                   *
> * Email: kevins@hpspd.hp.com              *
> *******************************************

I posted basically this same request about a month ago.  I got a
bunch of responses (thanks to everyone who responded) but no solid
leads as to where to buy it.  One guy at MIT said he recently used
it in a class, but neglected to give me an email address so I could
get more details.  If you're listening at MIT, please send me your
email address.

I am also working on getting MAGNET running on my workstation.
It is supposed to analyze fields of the type that were done
on teledeltos paper in prehistoric times (i.e. when Hewlett was
a technician).

Rick Karlquist
Hewlett-Packard Santa Clara Division
rkarlqu@scd.hp.com
From: Ligon@macgw1.ge.com (Woody Ligon)
Newsgroups: sci.electronics
Subject: digital video storage ???
Date: 18 Aug 92 17:23:06 GMT
Distribution: usa
Organization: GE-CRD

((SORRY IF YOU HAVE SEEN THIS BEFORE. I TRIED TO POST IT SEVERAL WEEKS AGO 
AND GOT ZERO RESPONSE. I AM NOT SURE IT MADE IT PAST THE LOCAL NODE. ))

I am looking for a source for a device or circuit board which would perform
the following functions or some part thereof:

1. Digitally store about 5 seconds of NTSC video (low res/ B/W). (A total
			of about 80 frames would be adequate)

2. After 5 seconds, store the next 5 seconds into the same
   memory as the first five seconds.  Repeat until interrupted.
			(essentially the same function as a loop tape in an audio recorder)

3. If interrupted, save the most recent 5 seconds until power is switched off.

4. After interrupt and on command output the last 5 seconds of video in 
   NTSC format. 

5. Operation on 12 V preferred.

6. Should be free standing and not require a dedicated PC.

Such gadgets are readily available for audio applications but is a video 
version available yet????

All ideas much appreciated.

Woody Ligon  (ligon@macgw1.crd.ge.com)
standard disclaimer applies
Newsgroups: sci.electronics
From: nagle@netcom.com (John Nagle)
Subject: Re: Laser speed gun detectors?
Date: Fri, 14 Aug 92 18:42:54 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 

mmaster@parnasus.dell.com (Michael Masterson) writes:
>So far, Cincinatti Microwave has a model out, and Bel has one about to
>hit stores, CM claims 2500feet detection range, Bel claims 5000 feet,
>the range on the speedguns is only about a thousand feet.
>The detectors are based on the technology that was used to detect
>laser guided weapons in Desert Storm.

       Anyone know what they're using as a detector?  I'm building a laser
rangefinder for robot vision, and I'd like to know what these guys use.
PIN diodes don't put out much output and avalanche diodes are too nonlinear
for use when the beam is dimmer than the ambient light.  So what do they
use to get that kind of S/N?

					John Nagle
From: kolstad@cae.wisc.edu (Joel Kolstad)
Newsgroups: sci.electronics
Subject: Re: Source of 68HC705K1
Keywords: none
Date: 21 Aug 92 01:43:23 GMT
Organization: U of Wisconsin-Madison College of Engineering

In article <1992Aug20.190152.13836@dutrun2.tudelft.nl> rcdsdgx@dutrun2.tudelft.nl (Dik Groot) writes:
>In article <18AUG199215052853@rose.uib.no> fafaf@rose.uib.no (FRIHAGEN, ANDERS) writes:
>>
>>Do anyone have a source of reasonably priced 68HC705K1 OTP's?
>>The Norwegian distributor has none in stock and will not get any from 
>>Motorola for more than a month... 
>>
>The (A) Dutch distributor told me that the European side of Motorola 
>is concentrating their sales on the 68*11 line of products, and so they
>will not sell any *705's.
>
>Try to buy them directly in the USA!

Amazing, the USA can do something right for once that Europe can't.

Maybe it's time for a group purchase of 68HC705K1's?  There seems to be
sufficient interest in them to place a big enough order to get some good
prices.  And we could also help out our friends overseas...

If anyone's interested in this, let me know, and I'll see if I can dig up
the previous posts from this newsgroup about where to get the 68HC705's
cheap and about organizing this.

					---Joel Kolstad

Who still hasn't had more than about an hour to play with his 68HC605KICS :-(
From: moisan@silver.lcs.mit.edu (David Moisan)
Newsgroups: sci.electronics
Subject: Re: TV with black mountains
Date: 16 Aug 92 17:49:41 GMT
Article-I.D.: mintaka.1992Aug16.174941.23405
Followup-To: sci.electronics
Organization: MIT Laboratory for Computer Science

When you see these "mountains", does the picture distort--does it look like it's "scrunching" up from the bottom?  Two things come to mind re causes:
 
 1) The TV's degaussing coil is stuck on;  this would cause _color_
distortion, though.
 2) An open capacitor in the power supply is causing a _very_ bad case of hum.
 
These are generalities:  I've never had the pleasure of working on sets in the UK <grin>.
 
Best,
 
---N1KGH---
Newsgroups: sci.electronics
From: fafaf@rose.uib.no (FRIHAGEN, ANDERS)
Subject: Source of 68HC705K1
News-Software: VAX/VMS VNEWS 1.41    
Organization: University of Bergen, Norway
Date: 18 Aug 1992 15:05 +0100


Do anyone have a source of reasonably priced 68HC705K1 OTP's?
The Norwegian distributor has none in stock and will not get any from 
Motorola for more than a month... 

Please mail me, as our News discards things really fast!

Anders Frihagen
Norwegian Computing Centre for the Humanities
University of Bergen, Norway
FAFAF@rose.uib.no
From: adrian@csqx.cs.rhbnc.ac.uk (A Johnstone)
Newsgroups: sci.electronics
Subject: Re: Solder melting point (was Re: How hot can the 486-50 cpu run ?)
Date: 21 Aug 92 12:17:02 GMT
Reply-To: adrian@csqx.cs.rhbnc.ac.uk (A Johnstone)
Organization: Dept of Comp Sci, Royal Holloway & Bedford New College Uni London

In article <THEN.92Aug19211705@vipunen.hut.fi>, then@vipunen.hut.fi (Tomi  H Engdahl) writes:
|> 
|> In article <1992Aug18.151205.2809787@locus.com> dana@locus.com (Dana H. Myers) writes:
|> 
|> >I don't have a reference handy, but I recall that solder melts at a lower
|> >temp than 400 C. I mean, 400C is 750 deg F. 
|> 
|> My reference says that the solder melts in temperatures between 188C and 
|> 220C. For eaxample Multicore 60/40 melts at 188C. Multcore Savbit melts at
|> 215C.
|> 
|> >I can imagine the 486-50 running at 100-120 C, but not 400 C, even briefly.
|> 
|> I think that over 200C is too high for silicon chips.
 

A collegue of mine has suffered from a bipolar device that disppitated 7W and
thus detached itself from the board by melting the solder...

Check out a paper called Packaging a 150W Bipolar ECL Microprocessor by William
R Hamburgen amd John S Fitch from DEC's WRL if you want to find out about the
bleeding edge of this subject.

(for DEC WRL reports, email to WRL-Techreports@decwrl.dec.com with the word
'help' in the subject line)

                                Adrian
From: forbesm@atlantis.CS.ORST.EDU (Mark Forbes)
Newsgroups: sci.electronics
Subject: Re: Where to find condutive silicone rubber sheets?
Date: 18 Aug 92 04:06:01 GMT
Article-I.D.: leela.1992Aug18.040601.23968
Organization: Computer Science Outreach Services - Oregon State University

jkubicky@cco.caltech.edu (Joseph J. Kubicky) writes:


>Does anyone know where I can get conductive silicone rubber sheets around
>1mm thick (although I might be interested in thinner)?  I'd like to try
>to use these to make a simple tactile sensor.  Also, can anyone recommend
>a good conductive glue (I've heard of something called "Silver Loaded" by
>RS Ltd.) and a source for it?

Try Interlink Electronics
PO Box 40760
Santa Barbara, CA 93103
(805) 684-2100
(805) 684-8282 fax

They make force-sensing resistors in sheet form.

Mark G. Forbes | forbesm@atlantis.cs.orst.edu
Corvallis, OR  | 503 757 8416 work phone    | Hardware R & D
From: brd@images1.Waterloo.NCR.COM (Barry Drodge)
Newsgroups: sci.electronics
Subject: Re: Canned Oscillator Pinout
Date: 13 Aug 92 01:32:11 GMT
Organization: Imaging Systems Division, NCR Corp, Waterloo, Ont., CANADA

In article <1992Aug10.045201.1@fnalc.fnal.gov>, ifversen@fnalc.fnal.gov (King Under the Mountain) writes:
> In article <df2mh2n.nagle@netcom.com> (John Nagle) writes:
> >Keywords: oscillator crystal
> 
> >     Easy question.  What's the pinout for standard 4-pin oscillators that
> >come in a DIP-like package?  I know they take +5 on two pins and put
> >out the indicated frequency on the other two, but which pins?
> 
> Pin "1" (marked pin) -- no connection.
> Pin "7" -- GND.
> Pin "8" -- Output.
> Pin "14" -- +VCC.
> 


Actually, Pin 1 is either No Connection or Output Enable, depending on the
manufacturer and the model number of the part.

Canned oscillators are usually available with either CMOS or TTL output levels
capable of driving around a 4 mA load.



Regards,

--
Barry.R.Drodge@Waterloo.NCR.COM
Imaging Systems Division, NCR Canada LTD. 580 Weber ST. N, Waterloo, Ontario
Canada N2J 4G5                         Voice: 519-884-1710 FAX:519-884-0610
"My job is so top secret that it keeps me from knowing what I am doing!"
From: rcain@netcom.com (Robert Cain)
Newsgroups: sci.electronics
Subject: Re: PD schematic capture, layout and route?
Date: 19 Aug 92 04:11:29 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

I've found a great deal if one is willing to spend *some* money. Protel
is selling their $1600 DOS schematic, placement, routing and 3000 part
library for $395.  They have a Windows version imminent which apparently
is what people are awaiting so they are trying to wring a few more bucks out
of the old DOS one.  They mainly appear to differ in the user interface,
the Windows version being slicker.  I could care about slick. *And*
there is a 30 day money back guarantee.  The list of features and 
limits is impressive indeed.  Susan Page, Protel, 408-281-5858 and
ask about the "Protel For DOS Design System".  I have decided to go for
it.  I didn't think there was anything in that price range that was
full featured.

Bob

-- 
Bob Cain    rcain@netcom.com   408-358-2007

                ____________________________________________
               \                                           /
                \ Flames to /dev/null    Advice by email! /
                 \                                       /
                  \ PGP public key available on request /
                   \                                   /
                    -----------------------------------
From: jimh@ultra.com (Jim Hurley)
Newsgroups: sci.electronics
Subject: Re: Needed: Decibel meter...
Date: 22 Aug 92 23:22:54 GMT
Distribution: usa
Organization: Ultra Network Technologies

In <1992Aug22.200852.25100@cs.ucla.edu> aviz@lanai.cs.ucla.edu (Dr Algirdas Avizienis) writes:


>	Hello.  I am in need of a device that can measure volume in
>decibels.  Can someone refer me to a store/mail-order house that might
>carry such an item?  How much should I expect to pay.

>Thanks.

>Please reply by e-mail, as i doubt this is of general interest.

Radio Shack sells a nice little sound level meter.
I don't recall the price, but it's reasonable.
-- 
Jim Hurley --> jimh@ultra.com  ...!ames!ultra!jimh  (408) 922-0100
Ultra Network Technologies / 101 Daggett Drive / San Jose CA 95134
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Lithium Type 76 button batt. - any?
Date: 17 Aug 92 20:03:23 GMT
Article-I.D.: athena.1992Aug17.200323.14218
Distribution: usa
Organization: University of Georgia, Athens

First see if the camera needs repair.  If it has a leaky transistor, the
only symptom may be that batteries don't last long.

-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - don't tie education to an unpredictable income.
Newsgroups: sci.electronics,comp.dcom.modems