HDTenEightyP/NetNews huggingface dataset:
From: smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC)
Newsgroups: sci.electronics
Subject: Re: Par pc-port bidirecti
Date: 13 Nov 1992 13:29:26 GMT
Organization: SunConnect
Distribution: world
NNTP-Posting-Host: hardy.france.sun.com

In article <gate.4ZT6TB1w165w@toz.buffalo.ny.us>, cyberman@toz.buffalo.ny.us (Cyberman) writes:
> 
>     Pascal Roobrouck Sh53 entitled a message as 'Par pc-port bidirectional',
>    on the 11-10-92  14:05 to All.
>  PRS> I have a development kit for MCU's with a programmer that plugs into
>  PRS> the Centronics port of a PC. In the manual they say you need an AT.
>  PRS> However at home I have still an XT. The programmer software always
>  PRS> hangs on my XT when he tries to READ something from the Parallel port.
>  PRS> (a blank check..) On an AT at my office, it works fine ...
> 
>     If I remember the XT's port is implemented with some discret
>     TTL parts and the AT utilizes an 8255.  BIG difference.

The standard PC/XT parallel port is write-only, its just intended for 
driving a printer. ATs usually have bidirectional ports.
> 
>  PRS> Here my question : is there a difference in hardware between the
>  PRS> centronics port implementation in the XT and the AT PCs or is it only
>  PRS> the manufacturers 'fault'. Maybe I could buy an extra parallel port
>  PRS> for my XT that works well ??

Probably, but make sure it is a read/write port.

steve

-- 
Steve McKinty
SUN Microsystems ICNC
38240 Meylan, France
email: smckinty@france.sun.com	   BIX: smckinty
Newsgroups: sci.electronics
From: wai@socs.uts.edu.au (Wai Yat Wong)
Subject: Various national colour code of wires(e.g. earth) for elec. plug
Summary: What colour do different country use for wire designation in elec. plug?
Keywords: active, neutral, earth, colour code, electric plug, socket, pins
Organization: Computing Sciences, Uni of Technology, Sydney.
Date:  8 Nov 92 23:56:06 GMT

Anybody out there can tell me about the colour coding various
country use for labelling a wire as active or neutral or
ground.
 
I know that green is obviously earth, but I have this
two extra wire; one of them is white, the other is
black. Does the white go to the active pin and
black go to the neutral pin?
 
Also, the only thing I know about alternate current is
that the current flows both way alternatively. Then please
explain to me why there is a voltage (240 V) between active
and ground, but nothing between neutral and ground?
 
Finally , for U.S.A's electrical plug, which pin is always
designated as active (the smaller one)? Also, I like to
find out the info for Australian systems.

Please educate me, the ignorant sponge :-)

My email address is wai@socs.uts.edu.au

(I hope I did not double posted this, as I got a message claiming
 that my previous post failed )


--
#########################################################################
( Wai Yat Wong          | School of Computing Sciences                  )
( Phone No. : 330-1841  | University of Technology, Sydney, NSW 2007    )
( Fax No.   : 330-1807  | wai@socs.uts.edu.au                           )
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Heat conduction vs. electron conduction?
Date: 14 Nov 92 00:42:44 GMT
Article-I.D.: u.1992Nov14.004244.8542
Organization: University of Washington, Seattle

In article <1992Nov10.180223.25291@galileo.cc.rochester.edu> mh001b@uhura.cc.rochester.edu (Matthew W. Hacker) writes:

>Are there any substances that conduct electricity well, but
>conduct heat poorly?  This sort of material would be pretty
>well suited [to thermocouple design...]

	Metals are good heat conductors because the electrons pick up
heat at one end, diffuse quickly through the metal, and dump the heat
wherever they interact with the colder metal elsewhere.

	Superconductors conduct electricity well, but (because
the electrons are not interacting with the lattice) are very poor
heat conductors.  It is indeed unfortunate that the temperature
range over which superconductors operate is so limited...

	The next best candidate is semiconductors: one can
create the charge carriers at some doped region, and send 'em
across an intrinsic (non-conducting) zone, while no large
population of free electrons exists except for the minimum
number of charge carriers for the applied current.  For this
reason, practical thermoelectric coolers are usually made with
semiconductors (one other reason is the large Seebeck coefficients
that are available).

	Another quaint property of semiconductors is the non-metallic
nature of the atomic bonds; semiconductors are not ductile,
and cannot be made into flexible wire.  For thermocouples
used to measure temperature, one generally just uses a very long
length of the wire, to try to minimize the heat flux through the
measuring instrument, and the errors this introduces.

	John Whitmore
Newsgroups: sci.electronics
From: rahhelp@rigel.tamu.edu (Ronald A. Huizar)
Subject: microcontrollers
Keywords: sizes? Exrternal Memory Capability
Organization: Texas A&M University, Academic Computing Services
Date: Thu, 12 Nov 1992 02:35:08 GMT




Hey folks,

I am preparing for a senior design project that I am going to be
taking in the Spring semester. I am planning to use a microprocessor
or microcontroller to perfrom our task.

We my partner and I are planning to make an answering machine that
will take messages for an individual person. For example: 4 people
live in one house. The phone rings and no one is home so the machine
picks up and says it's message and then says "press 1 to leave message
for ---, press 2 to leave message for ----, etc" Then say when I get
home I go to a keypad enter my number and hear my messages instead of
having to hear all the other peoples messages.

One problem that I am already see is that the microcontroller I was
planning to use the MC68HC811E2 can only address about 64K of external
memory, and we are planning/contemplating storing the message
digitally. I have not had much DSP, my partner has had more than I,
but I figure that for the telephone we will need to sample at least
6000 Hz (since the phone BW is 30-3000, you remember Nyquist don't
you). For a 1 minute (kinda long I know) message that will require
about 3 Meg of memeory. To much for the E2. So I know that the
microprocessors can handle the amount of memory I would need but I did
want to have build my own computer first.

Now my question.

Is there some sort of MCU available that can address enough space for
me to build this device? I have heard about Motorola having a new
improves MCU that was 32 bits. Is this true, does anyone have any part
numbers and/or prices.

Sorry about the length of this post.

Ronald A. Huizar
User Services Assistant
Academic Computer Services
Texas A&M University
College Station, Tx 77840
RAHHELP@rigel.tamu.edu
Organisation: European Space Operation Centre (E.S.O.C)
Date: Sunday, 8 Nov 1992 17:33:43 CET
From: <EMUELLER@ESOC.BITNET>
Newsgroups: sci.electronics
Subject: newsgroop archive?

Is this newsgroop (sci.electronics) archived somewhere?
Are there any chances to get past years articles retreaved?
Any hints wellcome.
tnx.
Newsgroups: sci.electronics
From: jmarin@messi.uku.fi (Jukka Marin)
Subject: Re: 68HC11E9
Date:  9 Nov 92 12:41:50 GMT
Organization: University of Kuopio, Finland

hampster@phys.ksu.edu (Kip J. Mussatt) writes:

>Question:
>	What is a good proven way to hook up this chip in single chip
>mode to do A/D conversions and spit out data via the serial port?

I use the 68HC11A1 chip to do this (and much more).  I program the
EEPROM with the code to do what I want, so I can use single chip
mode.  I wrote a small utility for my Amigas which programs the HC11
RAM or EEPROM with one command..  Very fast to update the program
code within the HC11.

You'll also need a simple logic circuit to get the HC11 going after
power-up (it needs a BREAK character from the RS232 to start up).
  I 
>have the data books, but little hints, and references would be neat to 
>have.  If anyone has any suggestions or applications notes that I could
>get copies of (I will pay for the copies) I would appreciate it.  Also, 
>someone said this beast can run at 8MHz.  I thought ALL HC11's topped out
>at 4MHz ? Is this correct?  Please E-Mail me any reponses/suggestions. 

The crystal frequency is 8MHz which is divided by 4 to get E clock of
2 MHz.  There are chips which work with E clock = 4 MHz as well, but the
common types can go at 2 MHz only (officially, you can overclock them if
you dare.. ;-)

>Thanks in advance.

Hope this helps,

  Jukka Marin
-- 
| Mail:  Jukka Marin         |     E-Mail:           jmarin@messi.uku.fi  |
|        Metsurintie 17 B 8  |     FAX/voice:        +358 71 232 793      |
|        70150 Kuopio        | There's God above computers -              |
|        FINLAND             |                       Love beyond the hate |
From: aslt@acad2.alaska.edu
Newsgroups: sci.electronics
Subject: RE's AC Inverter? (mispost)
Date: 5 Nov 92 23:51:43 GMT
Article-I.D.: acad2.1992Nov5.195143.1
Organization: University of Alaska

Sorry for mislabellign subj of previous post ($%^&*! RPN newseditor)
From: vbreault@rinhp750.gmr.com (Val Breault)
Newsgroups: sci.electronics
Subject: Re: Big Brother Radio Shack
Date: 6 Nov 92 14:34:40 GMT
	<HARKCOM.92Nov6091919@spinach.pa.yokogawa.co.jp>
Organization: General Motors Research Labs
In-reply-to: harkcom@spinach.pa.yokogawa.co.jp's message of 6 Nov 92 00:19:19 GMT

In article <HARKCOM.92Nov6091919@spinach.pa.yokogawa.co.jp> harkcom@spinach.pa.yokogawa.co.jp (Alton Harkcom) writes:

   In article <1992Oct30.150034.15841@bony1.bony.com> billg@bony1.bony.com
      (Bill Gripp) writes:

    =}If you feel as I do that your phone number is something private, that
    =}it's none of RS's business (or other similarly nosey companies), just
    =}tell 'em you don't have one.

      Lying to protect ones belief in one's rights.  Do we have a politician
   in our midsts? :)

Good point....  What's become of honesty and personal responsibility? 

Try this technique the next time you feel threatened by the disclosure 
of personal information.  Look the person straight in the eye and say:

     "I do not want to disclose any personal information."

I don't know about you, but I've always had a great deal of respect 
for people that can look you in the eye and tell you the plain truth.

-val-
--

Val Breault - vbreault@gmr.com - N8OEF
General Motors Research and Environmental Staff.
The opinions expressed by the author do not necessarily reflect 
those of the GMRES or the General Motors Corporation.
 

Newsgroups: sci.electronics
From: tchannon@black.demon.co.uk (Tim Channon)
ReplyTo: tchannon@black.demon.co.uk
Subject: Re: HISTORIC POSTING: First complete PCB design
Distribution: world
X-Mailer: cppnews $Revision: 1.19 $
Organization: null
Date: Thu, 5 Nov 1992 23:59:49 +0000

> 	BULL!

:-)

This is what mail of various sorts is for, news it is not.

Let's put it this way: if I start posting board designs in gruberM7 with it's 
200k files you will be happy? 
Gerber/excellon would be a good choice although (note this) the whole thing is 
uneconomic. Can you imagine 100 different people all making one-off boards?

>    I like seeing usefull postings here.   I suppose he should also post

Useful? To 0.01% of recipients?

>    schematics and other long usefull stuff to /dev/null ?
>    No all of us have ftp or can Email whatever.

I understand your concern but I still say find a better way. Posting those 
unsolicited uuencodes is bad manners.

  TC. 
    E-mail: tchannon@black.demon.co.uk or tchannon@cix.compulink.co.uk
From: strohm@mksol.dseg.ti.com (john r strohm)
Newsgroups: sci.electronics
Subject: Re: Anyone know a good PLL?
Date: 10 Nov 92 00:05:33 GMT
Distribution: usa
Organization: Texas Instruments, Inc

Let's see, you want center frequency 10 kHz and bandwidth 1 kHz.  You don't
say anything about lock time or power consumption, or about power supply.

Off the top of my head, I'd try a CD4046 CMOS PLL unless I knew I couldn't
square up the input waveform.  For a real analog PLL, LM565 is pretty easy to
hack, and is good up to around 1 MHz.

Lancaster's CMOS cookbook has a fair amount of good stuff on the 4046 PLL.
National Semiconductor Linear and Linear Applications books cover the 565.

Good luck!  Getting a PLL working reliable can be a real challenge.
Newsgroups: sci.electronics
From: wiegand@rtsg.mot.com (Robert Wiegand)
Subject: Re: Big Brother Radio Shack
Keywords: competition, free market, monopoly
Reply-To: motcid!wiegand@uunet.uu.net
Organization: Motorola Inc., Cellular Infrastructure Group
Date: Mon, 9 Nov 1992 16:12:42 GMT

bew@brahms.udel.edu (Ben Williams) writes:


>I've just read this thread containing 50+ complaints about Radio Shack.
>What I would like to know is:  Why do we have to shop at RS to get
>electronic supplies?  Why aren't there other electronic stores in
>competition with RS?  Well, maybe there are in your area (let me know)
>but where I live they are the only thing going.  And boy is that ever
>frustrating!  Aren't there laws about monopolies?  Aren't we living under
>a competitive free-market economy where stores that customers do not like
>to go to will be competed with by other stores?  Isn't that the way it's
>supposed to work?  I mean, RS does seem to usually have what I am looking
>for, but I still would like the option at least to do business elsewhere.
>You know, like maybe an electronics store where the salesmen know what
>they are talking about...

You can always buy parts mail-order. Personally, I don't buy parts
from Radio Shack anyway - their selection sucks.

-- 
------------------------------------------------------------------------------
Robert Wiegand - Motorola Inc.
motcid!wiegand@uunet.uu.net            uunet!motcid!wiegand
Disclamer: I didn't do it - I was somewhere else at the time.
Newsgroups: sci.electronics
From: alh@cypress.com (Andy Hawkins)
Subject: Re: Cable TV Tech Question
Organization: Cypress Semiconductor Southeast Design Center
	<1992Nov5.122636.5499@hemlock.cray.com>
	<1992Nov5.181038.17264@doug.cae.wisc.edu>
	<lfti4mINNlfu@jethro.Corp.Sun.COM> <VBREAULT.92Nov9164900@rinhp750.gmr.com>
	<ALH.92Nov10104450@nm.cypress.com>
Date: Tue, 10 Nov 1992 22:56:55 GMT


You say ...

>Channels 14 and up are in the Ultra High Frequency (UHF) band.  Those
>frequencies do not lend themselves to wide distribution via cable.
>Your cable provider cannot and therefore does not send programming
>via UHF frequencies.

What I have been thinking about was discussed here earlier, I think.
I want to get one of the amps that modulate baseband audio/video and or
remodulate Chan.3/4 to a UHF channel.  Then send these UHF signals throughout
my home with COAX.  Also I would like to connect an Ant. to the COAX with
a trap for the new UHF channels I've created.  I can add amps and distribution
equipment but it sounds to me like the UHF channels might not work well for
long distances of COAX.?  Is that what your saying or will that work but it is
more effecient to use VHF type frequencies for the cable cos?

BTW, if some one has more inputs on those modulators/re-modulators I'd like to
hear them.
thanks in advance.
--
Andrew L. Hawkins, (Andy), alh@cypress.com
Cypress Southeast Design Center, Starkville, Mississippi
Ph:(601)324-4634                       Fax:(601)324-4614
"The Weather is Here, Wish You Were Beautiful."
--        J.B.-- "COCOANUT TELEGRAPH"
From: v064mcqs@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Sources for UV lightbulbs
Date: 11 Nov 92 23:23:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


  I have been working with small scale pc board making and hate the direct etch
and photocopy toner iron on methods. They just are a waste of time and money.
I have been trying photo etching. For a while I have been using a plan light 
to expose the board. It does not do a good enough job and exposure
time takes almost 40 minutes. I am looking for a UV lightbulb that would
screw into a standard socket. But no one here at buffalo or at home in
Long Island carriers anything like this. Photo etching seems to be the best
method. Also I have been using blank copper board with pc resist sensitiser.
Its not cheap but covers alot of board. Does anyone have hints to apply
this properly to get good results or a supplier that sells single sided
copper clad board pre-sensitized thats not expesive. I would appreciate
any help.

		Neil Gandler
From: leag0552@uxa.cso.uiuc.edu (Luis E. Amaya)
Newsgroups: sci.electronics
Subject: pressure/temp sensors WHERE?
Date: 13 Nov 92 18:20:31 GMT
Organization: University of Illinois at Urbana

I have a friend in a foreign country, looking for some semiconductors, and I have no idea where to get them. Any help would be appreciated.
The needed components are:
   pressure transducers:
   MPX2050DP
   MPX2051GP
   MPX2101DP
   MPX2200DP
   MPX2101AP
   MPX2200AP
   MPX2700DP

   temperature transducer:
   MTS102

   All are Motorola devices.

   Thanks!

   Luis Amaya
   leag0552@uxa.cso.uiuc.edu
   University of Illinois at Urbana-Champaign
Newsgroups: sci.electronics
From: gsulliva@enuxha.eas.asu.edu (Glenn A Sullivan)
Subject: Re: IR circuit less prone to ambient light
Summary: IR detector to tolerate ambient light
Organization: Arizona State University
Date: Sun, 8 Nov 1992 07:44:22 GMT

nyarko@ee.ualberta.ca (David Nyarko) writes:........
> Could I have help (circuit diagrams etc.) for an Infra-Red
> (IR) transmitter/receiver with a {HIGH} tolerance to ambient light. 

 The ambient light you wish to tolerate is:
(1) SUNLIGHT   (2) 60 cycles   (3) harmonics of 60 cycles
and you need to DETECT/MEASURE  a weak IR signal in the presence of 1/2/3.
Apply some servoing (negative feedback) to the base of the phototransistor,
to control the operating point in the presence of changes in sunlight, etc.
And you might use that servoing to cancel out MOST of the 60 cycle energy.
And modulate your IR source, at a high rate, that is not an obvious harmonic
of 60Hz (that is, 120/180/240 Hz are right out). Try 3,141.5926535 Hz instead.
The challenge is applying bias to the phototransistor without draining away
the photon-induced current. And without adding lots of noise.
Allen Sullivan
Examining how design is a process of discovery.

Newsgroups: sci.electronics
From: mckillnm@unix2.tcd.ie (Marky Mark)
Subject: HELP : HD SCSI or IDE and the A1200
Organization: Trinity College, Dublin
Date: Mon, 9 Nov 1992 11:35:30 GMT


Hi there netter's,
		  I have just got my self an A1200.  A quick machine 
when compaired to my old A500 BUT a lot of software does NOT run on
it.  In order to get more serious use for the A1200 I want to install
a hard drive to it.  I have to choice of two drives

	1) A Microscience Int Crop (model HH-1050)
	or
	2) An old Seagate ST-238R

		  My first question has to be ... which, if any, have an
IDE interface ?  I have got a PSU that will do both drives and know a bit
about electronics so making up cables is not that difficult a task but am
I asking too much ... Can either of the above be linked to the A1200 (it
is clamed to have an IDE controler inside) with just a cable ?  If this 
is possable could some one E-MAIL me the pin connections ?

		  Provided the hardware connections go ok ... what has to
be done to the software to make it "see" the harddisk ?  How do I format
the disk (just like a black floppy) ?

		  The questions I have put here may seem very simple but
as I have not got the FULL set of manuals with the computer I have no 
circuit digm to go with !  So a full set of pin-outs for the 40 way IDE
connector in the computer and the pin-outs on the drives would be a big
help to solving this problem.

		   Thanks is advance,
	
			Mark (mckillnm@unix2.tcd.ie)



--
  _ _ _                 _ _ _                        |  mckillnm@unix2.tcd.ie
 ' ) ) )         /     ' ) ) )    /     /) /)        |-------------------------
  / / / __  __  /_      / / / _  /_ o  // // _  __   |As they say in Russia ..
 / ' (_(_(_/ (_/ <_    / ' (_(__/ <_(_(/_(/_(<_/) )_ |    "Mascow....C'Ya"
From: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: Equivalents book anyone?
Date: 9 Nov 92 11:27:53 GMT
Organization: Dept Electrical and Electronic Eng, Manchester University, UK


Hi
Could someone who has an equivalents book handy look up an
equivalent for the Texas Instruments T9004V transistor? It's
the line output transistor in Ferguson TX portable CTVs and
the Magic Smoke (TM) came out of mine the other day.

TIA
Mark
mark-r@spec0.ee.man.ac.uk
--
______________________________________________________________________
Multimedia Information Systems Lab | I'm a slug and I'm alright
Dept. Of Electrical Engineering    | That's 'cos I'm hermaphrodite
University of Manchester           | It bothers me not that I have no
Dover St. Manchester. M13 9PL      |                     friends
England                            | 'Cos I have fun with both my ends
Newsgroups: sci.electronics
From: X1FT@VM1.CC.UAKRON.EDU
Subject: need a pulse stretcher
Organization: The University of Akron
Date: Wed, 11 Nov 1992 02:10:21 GMT

Greetings,
 
I am in need of a simple circuit to stretch a pulse produced by a micro-tremor
vibration detector.  I would like the circuit to run on 12v, which precludes
(without adding a 5 v regulator) the use of a 74123 retriggerable monostable
multivibrator.  Is there another device, relatively commonly available, that
that runs on 12v that acts like a 74123 (CMOS maybe?).  Thanks!
                                                           - Frank
(The micro-tremor vibration detector consists of a gold plated ball resting
on two gold plated parallel wires in a hermetically sealed unit.  Vibration
causes the gold ball to momentarly break the circuit, generating the pulse.
The circuit can be wired to generate positive or negative going pulses).
 
*************************************************************************
Frank Tompkins              Internet: X1FT@VM1.CC.UAKRON.EDU
University of Akron      
Akron, Ohio   44325-3501 
  "I have not failed, I've just found 10,000 ways that won't work"
                                                     - Thomas Edison
Newsgroups: sci.electronics
From: pjaques@abc.sci.electronics (Elvis, who lives in your refrigerator)
Subject: Stupid question, I think...
Organization: Oberlin College Computer Science
Date: Fri, 6 Nov 1992 22:30:02 GMT
Distribution: sci
X-Posted-From: abc.cs.oberlin.edu
NNTP-Posting-Host: sol.ctr.columbia.edu

I was soldering away in my Amiga last night, attempting to install a
jumper, and suddenly the solder on the motherboard turned black.  Did
it oxidize or burn or what?  The jumper was copper wire, the solder
was lead.  What can I do to remove it (other than drilling); it won't
melt.
Why did this happen?  Is Cu + Pb a bad combination or something?
Please e-mail me, as I can't check the net every day, and my computer
won't boot.  Everything else inside the Amiga is exactly as when I
started, except for the black solder, so that must be the problem.

email: pjaques@occs.cs.oberlin.edu
--
--pjaques                                                .
pjaques@occs.cs.oberlin.edu                      //   _    _  _     _ (
if you will suck my soul,                      \X/   [_) |(_](_](_](=  )
i will lick your funky emotions.                     |  _)     |