HDTenEightyP/NetNews huggingface dataset:
From: hoffberg@phebos.aps.anl.gov (Mike G. Hoffberg)
Subject: 8051 C compilier
Summary: looking for an 8051 C compilier
Keywords: 8051
Organization: Argonne National Laboratory, Chicago Illinois
Date: Fri, 28 Aug 1992 20:50:10 GMT

I am looking for an 8051 C compilier.  At present I have been using
the Archamedies "Timesaver" compilier, but I have been unable to get
generate multiple tasks and use the interrupts on the 8051.  

I would like to know what other C compiliers exist for the 8051, and
if possible if they can be run on SparcStations.

Thanks in advance,

MIKE
-- 
Michael Hoffberg               /.\ <Build APS>    "Jeez, am I the only  ~\   /~
hoffberg@phepbos.aps.anl.gov  // \\ Argonne        one who paid full      \ / 
hoffberg@anlaps.aps.anl.gov  //_O_\\ National      price?" F.F.          9 | 2
Zippy was here              /__| |__\ Lab                  Obbyn! Obbyn!  _|_
From: tomb@hplsla.hp.com (Tom Bruhns)
Date: Mon, 24 Aug 1992 18:43:25 GMT
Subject: Re: NTSC video to VGA conversion?
Organization: HP Lake Stevens, WA
Newsgroups: sci.electronics

jmorriso@ee.ubc.ca (John Paul Morrison) writes:

>Has anyone seen or built a project that will convert an
>NTSC input signal into something displayable on a VGA monitor?

VGA scans at about 31.5kHz; NTSC has a horizontal rate of about
15.75kHz.  If you don't do something to correct the difference,
you will get the right and left halves of the picture overlaid
on the monitor.  Correcting the difference involves buffering 
up quite a bit of data at the NTSC rate so it can be hosed to
the monitor at the faster rate.  Good luck doing it in one or
two ICs with current state of the art.

Newsgroups: sci.electronics
Newsgroups: sci.electronics

> I've never really understood this. What possible difference does
> several hundred meters error make to either:
> 	a) an incoming 3 gigaton warhead
> 
> 	b) or even an [also incoming] t-52 tank
> 
> I'm sure I'm missing something obvious here......

The 3-gigaton warhead obviously doesn't care about a couple hundred meters.
However, if you want to pull the sort of stunts that made the nightly news
during the Gulf War (targeting individual buildings, etc.), it helps to know
exactly where you're shooting from.  (Yes, I know that the air-launched
missles used in the Gulf used their own "eyes", and so this isn't the
greatest example.  Best one I could think of right now.)  The military isn't
worried about those who might have 3-gigaton warheads - at least not as
far as fuzzing up GPS is concerned.  The folks that have those sorts of
toys don't need our GPS (and could have it anyway, if they DO need it, one
way or another).  But there's no sense making precision targeting any easier
for the bunch over at Terrorists-R-Us.


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
From: idh@nessie.mcc.ac.uk (Ian Hawkins)
Newsgroups: sci.electronics
Subject: Re: Humidity Sensor Needed (Cheap!!!)
Date: 3 Sep 92 21:18:59 GMT
Organization: Manchester Computing Centre

two humidity sensors available are :
1) Nemoto NPH-50A,  resistive ( a ceramic)
2) Philips H1 , capacitive (a foil coated film, data sheet 2322 691 90001)

By accuracy I presume you mean long term adherance to the
original humidity/electrical paramater characteristic combined
with a low (very low) temperature co efficient ?.  Neither sensor
is within 1% for some tests,  ie hysterisis during 10-90%
humidity scanning.  The nemoto is best for hysterisis (3%) and
the philips best for temp. coef. (0.1%/deg.C ) . Overall the
Philips looks by far the easiest sensor to work with.  The
nemoto will not work with a DC bias.  This is all from spec
sheets,  I havent yet used either sensor.
                Ian Hawkins
Newsgroups: sci.electronics
From: jory@athena.mit.edu (Jory Bell)
Subject: RE: quick pcb manufacturing wanted
Followup-To: jory@mit.edu
Organization: Massachusetts Institute of Technology
Date: Sat, 29 Aug 1992 01:33:31 GMT

Last week I posted a message asking for places to get quick, good,
cheap pcb manufacturing. First, I want to thank everyone who
responded... thanks. I few people also asked me to post the results of
my search, and I will do this in a couple of days when a certain
deadline passes and I can begin to lead a normal life again. Thanks
again...

				jory bell
				jory@mit.edu

Newsgroups: sci.electronics
From: rubin@chocktaw.cis.ohio-state.edu (Daniel Rubin)
Subject: Re: Success! Resist Pen Works in HP Plotter!
Keywords: resist pens, pcb, etching
Organization: The Ohio State University Dept. of Computer and Info. Science
Date: Sun, 30 Aug 1992 17:18:41 GMT

>David thinks of a neat idea for a circuit, but is too *@#$ lazy
>to draw up a circuit pattern, make a mask, perform the usual
>photolithography, and etch the board.
>So, he says, "Why not just put a resist pen in my plotter, and
>have the silly computer plot my patterns directly on the copper
>clad pc board? Then I can plunk it in some ferric chloride and etch
>it right away!"
>Alas, there are two fundamental problems:

Can the HP plotter correctly position a copper clad board?  I did not 
know that it could handle material that thick.  If so this sounds like
a much better route to take than messing with transfer sheets!

>"I'll use the old HP 7470A plotter. There is NO CAROUSEL anyway, just
>two pen holding bays (one on the left, one on the right) which are
>easily accessable; this plotter works with the cover raised, so there is

How much can you find this plotter for now?  I assume they don't make it
anymore.  I would think with a little more effort the ink of a regular
HP plotter pen could be replaced with the ink of the pen you had described.
This would allow the use of just about any plotter.  You may even be able 
to machine your own pens out of rod aluminum stock!  

								- Dan
-- 
  Daniel Joseph Rubin    |  "...A good football team for the alumni, parking
rubin@cis.ohio-state.edu |  for the faculty and sex for the students."
      GO        GO       |  - President E. Gordon Gee on the three things that
    BENGALS  BUCKEYES    |  a great university president must provide.....
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: What is a Fresnel lens? -- was Re: That Magic TV screen
Date: Fri, 28 Aug 1992 20:42:35 GMT
Organization: U of Toronto Zoology

In article <1992Aug25.172720.7172@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>Two different devices are called a Fresnel lens:
>
>(1) A device that works by diffraction, and is seen mainly in optics
>textbooks.  This device is very wavelength-specific.

Calling this a Fresnel lens is simply incorrect.  It's a Fresnel zone plate.
-- 
There is nothing wrong with making      | Henry Spencer @ U of Toronto Zoology
mistakes, but... make *new* ones. -D.Sim|  henry@zoo.toronto.edu  utzoo!henry
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Power Supply schematics / documentation needed
Date: 3 Sep 92 23:43:09 GMT
Organization: University of Georgia, Athens

In article <1992Sep3.034525.24959@unixg.ubc.ca> pdivine@unixg.ubc.ca (Patrick Devine) writes:
>Can anyone lead me to some infomation about building a basic power supply?
>Perferably in a postscript document.

If you still read _paper_, check out the book recently published by 
Radio Shack.
-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - we need not imitate mistakes of other states.
Newsgroups: sci.electronics
From: elelyc@nuscc.nus.sg (Y.C. Liang)
Subject: Re: Adjustable and Variable speed drives
Organization: National University of Singapore
Date: Fri, 28 Aug 1992 04:26:12 GMT

In article <17gjq9INNi66@venture.ksu.ksu.edu> misra@venture.ksu.ksu.edu (Boo!) writes:
>
>	Help me out a bit here, what is the main difference between 
>adjustable and variable speed drives. The books i have refered to tend
>to use them as though they are the same. Perhaps they are. From what I 
>gather, varible speed drives change speed depending on the load and adjustable
>speed drives run at 'adjusted' speed regardless of what the load is. 
>I am sure I am missing some basic concept here. Thanks for any help you
>can give me. 
>
>						misra@matt.ksu.ksu.edu 
>
I think they are the same thing.  Sometimes, people prefer to use
different names.  Regards.
From: fractal@infoserv.com (Tom Hedges)
Newsgroups: sci.electronics
Subject: Re: VIDEOCYPHER II/IIPLUS/RS
Date: Thu, 27 Aug 92 10:11:00 PDT
Organization: Fractal Design Corp.
Reply-To: fractal@infoserv.com (Tom Hedges)
Distribution: world
X-Mailer: uAccess - Macintosh Release: 1.6v1


In article <3926.140.uupcb@outlan.ersys.edmonton.ab.ca> (sci.electronics), terry.walter@outlan.ersys.edmonton.ab.ca (Terry Walter) writes:
>is anyone into the satellite dish scene and knows anything about the
>decoder board by GI.  The vCII/VCIIPLUS, and the VCII RS??
>

post this to rec.video.satellite and you'll get lots of replies...

-------------------------------------
Tom Hedges
fractal@infoserv.com --or-- fractal@applelink.apple.com
Newsgroups: sci.electronics
From: jru@Comtech.com (Jimmy R. Upton)
Subject: Magnetic Levitation - How do I do it?
Organization: Comtech Labs Inc.
Date: Thu, 27 Aug 1992 03:26:14 GMT

Several years ago I but some energy into researching a particular
"brand" of magnetic levitation and did not really get the answers 
that I was looking for.  Maybe someone on the net can point me in
the right direction.

I would like to magnetically levitate an object by using only apparatus
which is underneath the object to be levitated.  The object to be 
levitated, therefore, must not require wires to be connected to it
or a pole to run up though the center of it.  The demonstrations that 
I have seen always have a pole or rod going up through the center in order
to keep them from "falling off" the magnetic field.

Any pointers on where to find information on this subject would be
greatly appreciated.  

I attempted to build such a device about 4 years ago using a large
electro-magnet fed with ordinary (U.S.) household A.C. (60 hz, 120V).
I tried levitating several types of materials - metal washers, disks,
etc made of several different materials but nothing worked (i.e. no
repulsive effect was observed).

Specific Questions:

1. What is the correct material to use for the levitated metal?
2. What is the correct material to use, if any, for the electro-magnet
core?
3. What is the optimum frequency to use for alternating the magnetic
field?
4. Will this approach work at all (maybe this should be question 1 :-)?

Reply to the net if you wish, however to save bandwith I will be happy
compile Email responses and post a follow-up to the net.

Thanks for your assistance.

Jimmy
jru@Comtech.com
From: wiml@milton.u.washington.edu (William Lewis)
Newsgroups: sci.electronics
Subject: Re: Mac to Phone connections...
Date: 31 Aug 92 04:37:25 GMT
Article-I.D.: u.1992Aug31.043725.13428
Organization: University of Washington, Seattle

In article <1992Aug27.160630.615@fwi.uva.nl> aroest@fwi.uva.nl (Axello de Roestello) writes:
>rubin@cis.ohio-state.edu (Daniel Rubin) writes:
>
>>Hi all... I want to connect my Mac to my phone.  I am going to connect the
>>speaker of the Mac to the mic of the phone and the speaker from the phone to
>>the Mac's mic...
>
>>I know that the levels do not match.    ...
>
>Don't do it!!!
>Not only do the levels not match, the phone line can have 60 volts across its 
>wires and will fry your Mac when it is ringing. 

  To me it looks like Daniel wants to connect his Mac speaker to the
*phone handset* mike input, not directly to the line. In this case
the phone probably provides all the isolation he needs, as well as the
FCC-approved interface and hook switch and all thet cruft. 
  The problem in this case is that the solution probably depends on
the phone you're patching into and what kind of mike it uses.
I don't know enough about current brands of phones to say if there's
one overwhelmingly common circuit design (somehow I doubt carbon 
mikes are still in style) or if there's a way to connect to the phone
circuit after the first stage of amplification, or whatever...


-- 
email: wiml@u.washington.edu             |  Home:  Seattle, Washington   |
     (William Lewis)                     |  47 41' 15" N   122 42' 58" W | 
NeXTmail: wiml@ingalls.cs.washington.edu `-------------------------------'
        --*-- Member, Coalition to Preserve Semantic Vacuity --*--
Newsgroups: sci.electronics
From: simont@meiko.com (Simon Turner)
Subject: Re: how do you figure out cost per kilowatt-hou
Organization: Meiko Scientific Corp.
Date: Tue, 1 Sep 1992 12:54:05 GMT

It should work!

To work out your kWHrs simply multiply the number of kW you are using by the time
(in hours) for which you use them. Eg. a light bulb of 100W is equal to 0.1 KW;
if left on for a whole day it would therefore use 0.1*24 or 2.4 kWHrs. A whole
month would eat up nearly 75 kWHrs (expensive business leaving light bulbs on for
a long time - especially if they are in the loft or cellar (basement), unnoticed!)

This is fine for a light bulb as it stays 'on' all the time. But be careful with,
for example, things that are thermostatically controlled. They will only be taking
their rated power intermittantly.

Simon.

Newsgroups: sci.electronics
From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: coating materials for antennas
Summary: Aluminum in aluminum oxide is OK
Keywords: antennas materials
Organization: San Diego State University
Date: Sat, 29 Aug 1992 17:44:02 GMT

In article <1992Aug29.013405.19453@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
>Subject: Re: coating materials for antennas
>Summary: Aluminum in aluminum oxide is OK
>Keywords: antennas materials
>Date: 29 Aug 92 01:34:05 GMT
>The usual practice with aluminum antennas is not to coat them.  They
>coat themselves with aluminum oxide.  I don't see how the skin effect
>would be any different with aluminum in oxide than with aluminum in air.
>(The aluminum oxide is a very good insulator.)
>
>Now of course you would have skin effect problems if the coating were
>somewhat conductive (but less so than the metal) and the transition
>from metal to coating were not sharp.  But I haven't heard of this kind
>of problem with aluminum.
>
>-- 
>+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
>+ Unless otherwise noted, these are private opinions, not official statements.
>+ VOTE NO GEORGIA LOTTERY - we need not imitate mistakes of other states.

Confirming the above, aluminum oxide acts as a diode, and their effect shows 
in power lines not in high frequency. Skin depth at 100 MHz. is about 8 
micro meter, far below the diode region if there is any. Perhaps, the paint 
company needed new market.


Peace and Prosperity!
  ---==< 110 >==---
From: v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Cant find Transistor
Date: 4 Sep 92 16:12:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


  Does anyone know where I can find a Transistor TO-3 case 2SD665.
  Its used in power amplification. And I'm having trouble finding a mail
order company that stock them. I would appreciate any help
Newsgroups: sci.electronics
From: dly@joule (Dixon Ly)
Subject: Re: Spice for the Mac
Organization: Cal Poly, San Luis Obispo
Date: Sun, 30 Aug 1992 08:56:40 GMT

In article <1992Aug29.013756.19600@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>The Pspice Student Version for the Macintosh II (whatever that means)
>is $15.50 postpaid from Book Distribution Center, Prentice-Hall,
>Route 59 at Brook Hill Drive, West Nyack, NY 10995.
>
>This is intended to go with several textbooks that they sell.
>
>There are also PC versions: 5.25" disks $7.50, or 3.5" disks $9.00.
>
>The Mac version looks like more software: it occupies three 3.5"
>diskettes (hence the higher price than the IBM version, which occupies 2).

The the Mac version of Pspice is available at sumex-aix.stanford.edu
in the /info-mac/app directory.  The version there (5.1) requires 
a Math Coprocessor.

The last DOS version can be found in the simtel sites.  The latest version
for the IBM, however, is a Windows based program.  It can also be
obtained from Simtel in its windows3 directory.


   Dixon D. Ly
     dly@pan.calpoly.edu
     dly@joule.elee.calpoly.edu
     Electrical and Electronic Engineering Department, Cal Poly - SLO
Newsgroups: sci.electronics
From: iisakkil@vipunen.hut.fi (Mika Iisakkila)
Subject: Re: Computer on a car battery
Organization: Helsinki University of Technology
Date: 30 Aug 92 16:45:09

jeffn@nuchat.sccsi.com (Jeff Noxon) writes:

>Question 1: How can I power the motherboard?  I am interested mostly in
>efficency.  Would 5V regulator ICs do the job as well as anything?

Not really. I worked for a couple of years for a company that made
mainly automotive electronics. All non-trivial equipment had a
switching power supply with efficiency figures on the order of 90+
percent. The switchers started oscillating at around 6 V and after
that could deliver the rated voltages at as low as 5.2 V of input,
although this requires some black magic. Low operating voltages are
needed to keep the power supply working properly during engine start,
which causes a severe drop in the battery voltage.

For your purposes you will probably be happy with a simple step-down
switcher, which is easy to implement using a dedicated IC. One of
Texas Instruments' analog application data books has a very good
introduction to switching power supplies.
You will also want to be aware of how to do load dump protection.

>Question 2: How much battery life could I expect?  I have never seen
>car batteries with amphour capacities stated

All normal car batteries sold here have something like "60 Ah" printed
in huge letters on the side. I have no idea of the load current for
which this holds.

--
Segmented Memory Helps Structure Software
Newsgroups: sci.electronics
Subject: Stripping NTSC Color Burst
From: butler@vax.sonoma.edu
Date: 26 Aug 92 12:58:32 -0800
Organization: Sonoma State University

I have an NTSC video signal that I would like strip the color burst 
out of.  I'd also like to invert the video.  Can anyone think of a 
clever circuit to do this or of a device that might work?  I thought
about filtering out the 3.58 mhz, but I might lose some video 
information.  I'd appreciate any info or ideas.

Thanks,
-Bob
Newsgroups: sci.electronics
From: mancus@roger.jsc.nasa.gov (Keith Mancus)
Subject: Need encoding scheme for TV remote infrared controller
Organization: nasa-jsc
Date: Wed, 2 Sep 1992 00:35:40 GMT

  We're in the process of building a small robot, and we'd like it
to respond to a TV remote control.  Can anyone tell us:

  (1) Is there a standard carrier frequency?  The IR sensor we're using
detects 40 MHz.

  (2) Is the encoding scheme standardized?  If so, what is it?
 
  (3) Are there any other pitfalls we should know about?

-- 
| Keith Mancus    <mancus@sweetpea.jsc.nasa.gov>                         |
|                 N5WVR                                                  |
|  "If I owned Texas and I owned Hell, I'd rent out Texas and live       |
|  in Hell." -General Sheridan                                           |
From: gjw@dcs.glasgow.ac.uk (Mr Garry J. Wardrope)
Newsgroups: sci.electronics
Subject: Re: RS-232 Line Monitor???
Date: 3 Sep 92 08:41:24 GMT
Organization: Glasgow University Computing Science Dept.

geb1@ra.msstate.edu (Granville Barker) writes:

>I am trying to build a RS-232 line monitor.  

>I want to connect it between two RS-232 devices, and have a wire comming 
>off that I can connect to another computer and monitor both sides of the
>conversation between the other two devices.  Ie.. a Plotter and a Computer.

>I need to see what is being transmited and received, I tried hooking 
> pins 2 and 3 to diodes, then connecting rx on the monitor computer to
> the other end of the diodes.  THe other 2 devices still communicate ok, but
> I never see anything on my monitor computer.  I am connecting ground.

> Any ideas??


>Thanks,

>Granville Barker
>geb1@isis.msstate.edu


  I'm not surprised it dosn't work.  First of all RS232 signals are not 0v and 
some +ve voltage.  A 1 is -5 to15v and 0 is +5 to 15v ( I think I've got this
the right way round).  0v (-5 to +5) is indetermiate so strictly using diodes
to mix the signals shouldn't work.  It does work with some machines though as in real life an indterminate state has to be something.
 
 Second if both machines talk at the same time then the mixed signal will be
garbage, this setup will only work in half-duplex mode.  ( or simplex)

 You would have to use 2 serial ports to monitor 2 way conversations (and to
be able to tell where the data was comeing from).

 Chances are you only want to use this set up to occasionally check systems.
It would probably be easier to monitor each device seperatly - sending the same data.

			Hope this is of some help
				Garry

-- 
Mail:	Garry Wardrope, Computing Science Dept.,  Tel: (041) 339 8855 x5322
	Glasgow Univ., 17 Lilybank Gardens, Glasgow G12 8QQ, UK. 
email:	gjw@dcs.glasgow.ac.uk
".. and even if I came in sight of paradise what price its moon without Marsco"
Newsgroups: sci.electronics
From: geb1@ra.msstate.edu (Granville Barker)
Subject: Re: RS-232 Line Monitor/MAX 233???
Organization: Mississippi State University
Date: Fri, 4 Sep 1992 03:14:36 GMT

Thanks for the replies on the 232 monitor, I came up with another idea, can
anyone tell me if it will work?

First of all, the two machines will not be talking at the same time.

I have given some thought to connecting both lines to a MAX233 on pins 4
and 19 ( R inputs ) then connecting the R outputs to a 2-input OR gate,
and the output of it back to one of the ( T inputs (pin2)), then my monitor
computer to the ( T output (pin5)) of the max233.

Will this work?
I have never used a max 233 do they require any caps/ wierd voltages?
Can they get power from the 232 port?

Thanks,
geb1@isis.msstate.edu

Newsgroups: sci.electronics
From: birzerD@med.ge.com (Don Birzer)
Subject: Re: Damark catalog
Followup-To: sci.electronics
Organization: GE Medical Systems
Date: Tue, 25 Aug 92 18:43:43 GMT

Damark International, Inc.
7101 Winnetka Ave. N.
P.O. Box 29900
Minneapolis, MN 55429-0900
(800)729-9000

In article <1992Aug23.004659.19401@u.washington.edu>,
newsman@milton.u.washington.edu (Chris Ricci) wrote:
> 
> I am looking for the address or the phone number for Damark.  Does anyone
> happen to have it.  I would appreciate it.  Thank you!
> 
> Chris
From: tching@target.water.ca.gov (Tracy Ching <SysAdmin>)
Newsgroups: sci.electronics
Subject: Re: Needham Electronics PROM burner good/bad ?
Keywords: PROM microprocessor
Date: 29 Aug 92 22:09:34 GMT
Article-I.D.: csus.1992Aug29.220934.876
Organization: California State University, Sacramento

In article <BtrGwv.Jqz.2@cs.cmu.edu> rwc@ius4.ius.cs.cmu.edu (Randy Casciola) writes:
>>Howdy,
>>	I'm doing a small microprocessor project and need to 
>>	get a simple PROM burner.  
>>					Dan
>
>We've been using one here for about 2 months now to program 27C256
>EPROMS with no problems.  The software is a little cumbersome to set

	I use it all of the time.  I also have the 8031 87C751 modules
and it works great.  I think it is the biggest "bang" for the buck.
Setting up the init file is a bit cumbersome but worth the $$ you'll
pay for a burner for your small project.  Needham people are very helpful
and friendly over the phone.  Good service and low cost together.
Newsgroups: sci.electronics