HDTenEightyP/NetNews huggingface dataset:
From: keng@zcar.asd.sgi.com (Ken Greenebaum)
Newsgroups: sci.electronics
Subject: WANTED: Info on Acer 7510 X Terminal
Summary: need specs
Keywords: Acer 7510 X terminal
Date: 15 Sep 92 19:04:33 GMT
Distribution: na
Organization: Silicon Graphics, Inc.  Mountain View, CA



Hi,



I recently purchased a prototype Acer 7510 X terminal inexpensively at
a local surplus store.

It is supposed to be 8086 based.  I am hoping to use it as an inexpensive
imbedded controller (although I would also play w/it as a slow X terminal
if given a chance).

The machine has memory, serial, parallel and ethernet on it.


Unfortunately the board is missing parts :(

I need to know what ethernet controller chip this beasty used, as well
as some other components.

Determining the memory map would be VERY helpful as well.


Does anyone have this device?

Any Acer engineers out there??

Thanks for any information.


							-Ken keng@sgi.com
Organization: Penn State University
Date: Tue, 8 Sep 1992 09:30:16 EDT
From: <GNR100@psuvm.psu.edu>
Newsgroups: sci.electronics
Subject: PSPICE Statement

       Could somebody give me info on the Pspice device 'U'?  I have a manual
that mentions it and gives the general form, but say to reference another
manual for any useful information.  I personally think that's a scam to sell
two manuals instead of one.
    By the way, the manual is SPICE - A guide to circuit simulation & analysis
using PSpice, by Paul W. Tuinenga.

                  gnr100@psuvm.psu.edu


Newsgroups: sci.electronics
From: das50852@uxa.cso.uiuc.edu (dan)
Subject: Re: Question about origin of name of BNC connector
Organization: University of Illinois at Urbana
Date: Tue, 8 Sep 1992 23:29:21 GMT
Keywords: BCN connector, name origin

lmbrown@vela.acs.oakland.edu (lmbrown) writes:

>I think that the BNC stands for Bayonet Connector.  Can anyone confirm or
>disprove this?

I think so too.  I have a lab manual that uses the two terms 
interchangeably.  Whether or not BNC stands for BayoNet Connector,
is something I don't know.


				dan

-----
artie@uiuc.edu
Newsgroups: sci.electronics
From: evansmp@uhura.aston.ac.uk (Mark Evans)
Subject: Re: AC power inverter questions?
Organization: Aston University
Date: Tue, 15 Sep 1992 12:12:57 GMT

smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:
: In article <1992Sep14.210900.1@acad2.alaska.edu>, aslt@acad2.alaska.edu writes:
: > This is probably a stupid... *ahem*, well, a question that reveals how just how
: > much I have forgotten, but it is one that I have thought about frequently
: > over the years, and the discussions about power supplies and dynamotors
: > and whatnot resurrected it in my mind...
: > 
: > Many inverters use square waveforms rather than sinusiodal waveforms. 
: > Intuitively, though, it seems that significantly less energy will be 
: > transferred from the primary to the secondary of the transformer using 
: > square waves (input changes at discrete places in the waveform) than 
: > would be transferred using sinusoidal waveforms (input continuously changing)
: > What am I missing?
: 
: I don't think you're missing anything, square waves are used simply because
: they're easier & cheaper to create. As far as efficiency goes, an oscillator
: producing square waves will have switching elements (usually transistors)
: either on or off, so they run cool. Generating sine waves requires the
: transistors to operate in a linear fashion, and for most of the cycle they
: will be only partially on. As a result they will dissipate a lot of heat
: which calls for big transistors, and also a lot of wasted (and precious if
: coming from a battery) power. 

If you are using an inverter to power lighting then note that
Flouresent tubes will run at a higher efficencency (produce more light)
if they are run at a higher frequency.
(several KHz is a usefull frequency)
-- 
-------------------------------------------------------------------------
Mark Evans                                   |evansmp@uhura.aston.ac.uk
+(44) 21 565 1979 (Home)                     |evansmp@cs.aston.ac.uk
+(44) 21 359 6531 x4039 (Office)             |
From: brianr@tekig1.PEN.TEK.COM (Brian E Rhodefer)
Newsgroups: sci.electronics
Subject: Re: AC power inverter questions?
Keywords: flourescent
Date: 16 Sep 92 02:12:38 GMT
Reply-To: brianr@tekig1.pen.tek.com
Followup-To: poster
Distribution: na
Organization: Tektronix, Inc., Beaverton,  OR.

In article <1992Sep15.121257.12932@aston.ac.uk> evansmp@uhura.aston.ac.uk (Mark Evans) writes:
>
>If you are using an inverter to power lighting then note that
>Flouresent tubes will run at a higher efficencency (produce more light)
>if they are run at a higher frequency.
>(several KHz is a usefull frequency)

Maybe so, but since `normal' flUOrescent fixtures use series inductance
to limit their operating current, it might be a tad hard to come up with
the kilovolt-range supply voltages required to run 'em at `several KHz'.


Brian Rhodefer
From: pjh@mccc.edu (Pete Holsberg)
Newsgroups: sci.electronics
Subject: Re: 3rd Party PADS Manuals?
Keywords: PADS schematics
Date: 9 Sep 92 13:50:20 GMT
Organization: The College On The Other Side Of Route One

In article <bu9ji6.7jp@wang.com> pvr@wang.com (Peter Reilley) writes:
=	I have the shareware version and the minimal manuals.   There
=are a few step by step examples illustrating the process of schematic
=capture, pc layout, part creation, plotting, etc.   I was able
=to create a small design without too much difficulty.

I'm getting conflicting reports on the limits of the shareware version
of PADS software. What is the max number of components? Does that
include resistors, caps, etc., or is it a max for ICs?

Thanks,
Pete
From: Leon_Davidoff@panam.wimsey.bc.ca (Leon Davidoff)
Newsgroups: sci.electronics
Subject: Re: Wanted: Schematic for Okidata 82A Printer
Distribution: world
Date: 9 Sep 92 00:36:55 PST
Organization: Commodore Computer Club / PaNorAmA

Oki's are before my time but the company I work for used to be a dealer and
I still have most of the manuals on my selves at work.  I'll take a look
and see what I can find.  I'm fairly sure that I have shop manuals on the
82A.  How about sending me a fax number and I can then send the stuff as
soon as I get my hands on it.


-- Via DLG Pro v0.992

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Leon
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Newsgroups: sci.electronics
From: grimaldo@tokyo.seri.philips.nl (Emilio Grimaldo)
Subject: Re: Is EIA-422 Centronics?
Organization: Philips Semiconductors, The Netherlands 
X-Newsreader: Tin 1.1 PL4
Date: Mon, 7 Sep 1992 07:43:48 GMT

Oh no, The 422 standard is a (RS)232 that uses differential signals as far as
I know, and it is therefore a serial link. The Centronics is a different (and
parallel) standard.


--
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
Newsgroups: sci.electronics
From: cab@col.hp.com (Chris Best)
Subject: Re: VERY small Sony Walkman design:  did this exist, any to be found?
Date: Mon, 14 Sep 1992 16:51:54 GMT
Distribution: usa
Organization: your service


Until more responses come in, here's a thought:

Could your friend have been thinking of a portable CD player
instead?  There's at least one on the market (RS maybe?) that
leaves the CD "sticking out" on three sides.  It's actually
protected by a clear plastic case, but that's what it looks 
like.

Just a thought.
From: dpd007@bcsaic.boeing.com (Mark Standiford)
Newsgroups: sci.electronics
Subject: Gas discharge power supplies
Keywords: Laser Xenon Arc Power
Date: 10 Sep 92 20:48:01 GMT
Organization: Boeing Computer Services, Seattle


I have been trying to build some power supplies for gas
discharge systems (argon ion laser, CO2 laser, high
pressure xenon arc lamp) and have repeatedly run into
the same two general problems.

     1) How do you generate the high voltage necessary 
to initiate breakdown of the gas without frying all your
low voltage high current components?

     2) How do you regulate the running current to prevent
oscillation when you have more than a few amps of power to
deal with (ballast resistors dissipate way too much heat)

I realize I could probably solve problem 1 by using high 
voltage/high current rectifiers, but this is cost prohibitive
and these kind of components are hard to find new in small 
quantities let alone surplus.

Is problem 2 a candidate for pulse width modulation?

Please note that I am only a hobbiest and not an EE. Any
pointers to cheap power component sources (I'm not totally
adverse to using tubes) or texts, especially with practical
as well as theoretical information would be greatly appreciated.

Notes on scale of power supplies:

     would like to run argon ion at approx 90V 10A
     CO2 laser up to 5Kw input power 5Kv 1A (dream on)
     xenon lamp 14V 30A	approx 10Kv to strike

Please E-Mail me and if there's enough intrest, I'll 
summarize and post the response.

Thanks in advance,

       Mark E. Standiford
       dpd007@atc.boeing.com
From: paj@uk.co.gec-mrc (Paul Johnson)
Newsgroups: sci.electronics
Subject: Re: Wanted: waterfall/fountain noise
Date: 14 Sep 92 08:40:19 GMT
Reply-To: paj@uk.co.gec-mrc (Paul Johnson)
Organization: GEC-Marconi Research Centre, Great Baddow, UK

In article <1992Sep11.004850.13381@mole-end.matawan.nj.us> mat@mole-end.matawan.nj.us writes:
>I hope this wasn't covered six months ago ... but:
>
>Does anyone have a not-too-complicated (read: parts cheaper than buying
>a commercial box) `noise' device that approximates the sound of water
>pouring over a `fountain'?  Not the sound of a few parabolic streams,
>but of water falling over/around obstacles and falling a considerable
>distance into a body of water.

My stereo amp has an odd effect on the phono input.  I'm not sure if
this is a bug or a feature.  Select the phono and turn up the volume,
and you can hear random noise (white I think).  Then if I turn down
the treble, turn up the bass and hit the loudness compensator (which
boosts low base and high treble) the result sounds uncannily like a
large waterfall.  There is a low rumble down into the subsonics
(suggesting huge lumps of water falling into a deep pond) accompanied
by a high hiss (suggesting large amounts of spray falling nearby).  So
I suggest playing around with white noise and a decent amp and
speakers.  A sub-woofer would probably be pretty effective too.

BTW, my amp is a NAD 3030.

Paul.

-- 
Paul Johnson (paj@gec-mrc.co.uk).	    | Tel: +44 245 73331 ext 3245
--------------------------------------------+----------------------------------
These ideas and others like them can be had | GEC-Marconi Research is not
for $0.02 each from any reputable idealist. | responsible for my opinions
From: shofioni@joule.elee.calpoly.edu (Said Hofioni)
Newsgroups: sci.electronics
Subject: VLSI Project
Keywords: VLSI, MOSIS, Magic Layout Program
Date: 13 Sep 92 19:33:56 GMT
Organization: California Polytechnic State University, San Luis Obispo


    For anyone out there with design experience in VLSI and has used
either MOSIS or Magic in fabricating a project, I would like some advice.

    I am planning to do a my senior project here at Cal Poly, and would
like to do a VLSI design for my project.  The project would be fabricated
by MOSIS (at USC) and would be designed using a layout program like Magic.
The information that I would like is the following:

          1.) I would like to know if anyone out there has any design
              ideas for useful ICs.  My interests are in CMOS or BiCMOS
              digital circuits.  If you have a neat idea for a Senior
              Project, please contact me!  The project should be limited
              to about 120 hours of work and should operate in the 
              1 to 10 MHz range.

          2.) What kinds of simulation software are useful in VLSI
              circuitry software?  (Like ISPICE & CRYSTAL) And where
              can a student get a copy?  Unix and OS/2 are the preferred
              platforms (Sun Workstation and IBM PC).

          3.) Is there a version of Magic that has been ported to
              OS/2 2.0?  A guy that I know has an old version, but I
              am looking for something a little more current.  And where
              can it be acquired?

    If anyone has suggestions or comments, please forward them!  Information
concerning designs, MOSIS, or Magic are especially helpful because I am very
new to this!  Thanks in advance!   :-)

---------------
S. Tamim Hofioni
Reply to : Internet====>  tamim@manvmd1.vnet.ibm.com       OR
                          shofioni@joule.elee.calpoly.edu
Newsgroups: sci.electronics
From: lnosek@ux4.cso.uiuc.edu (Luke Paul Nosek)
Subject: Re: A much better power inverter design
Organization: University of Illinois at Urbana
Date: Mon, 14 Sep 1992 04:17:40 GMT

Actually, you may be able to improve on an inverter using a relay:

I was reading a book called Solid State Power Design or something like that -
it was a TAB or SAMS or one of those sieries... Anyway, the author pointed out
a combination of solid state and electro-mechanical that could improve on
the charactaristics of both:

Put the solid state components in parrallel with the relay. They will close
the circuit before the relay has a chance to move, which will reduce arcing
and pitting of the contacts when it does finally close. After the relay has
closed, almost all of the current will be taken up by it, meaning that your
solid state components will not need a heat sink because they are only "on"
while the contacts are moving. The only slight complication is that you need
a delay when the contacts open up again to prevent arcing there.

I've only heard one person mention this so far, and that was the author
himself.

Now, this idea might not be perfect for an inverter, because the relay
will still experience mechanical stresses from slamming up and down
constantly, but it might have some uses in a few applications demanding
high current from a small box with a short operating life. I dunno.

C
constantly
contacts, while 
Th
Newsgroups: sci.electronics
From: kolstad@cae.wisc.edu (Joel Kolstad)
Subject: Re: VERY small Sony Walkman design: did this exist, any to be found?
Organization: U of Wisconsin-Madison College of Engineering
Distribution: usa
Date: 13 Sep 92 15:08:18 CDT

In article <laird.716404723@stable.ecn.purdue.edu> laird@stable.ecn.purdue.edu (Kyler Laird) writes:
>I'm listening to mine right now.  It's a Toshiba KT-AS10.  I bought it
>when I was in middle school (~10 years ago!?).

I had one back in high school... only about 8 years ago :-).  And I paid,
I think, $90 for it... which was all HARD EARNED CORN DETASSELING MONEY!
(Man, am I glad that these days I get paid to do FUN things playing with
computers and electronics!).

For some reason, they kept dying on me.  I was (and still am) pretty hard on
walkmens, though... I dropped it plenty of times :-).  So it probably had
something to do with me. :-)

After about the 4th one died (it was getting embarrassing to keep returning
them to the store :-) ), I bought an Aiwa ???-400.  (McDonald's money,
there!).  That one worked fine for me, until it got stolen a few years
ago...

>It's a neat little unit, nothing especially advanced, just different.

Sure was.  It's too bad that there are very few neat things on the
market anymore... walkmen these days seem to be so... boring!  At
least there are some neat portable CD players out there.... Sony's
"buffer 1 megabyte of music so you won't hear skips" is pretty neat.
And Matsushita (Panasonic, Technics, etc.) has some neat things, but
that's it.  (Now if only Panasonic/Technics would get off their one
button headphone remote control kick... it's not bad, it's just that
one button limits you to no more than about 6 functions...  Sony
remotes are much more flexible!)

						---Joel Kolstad
Newsgroups: sci.electronics,alt.guitar
From: mpaul@unlinfo.unl.edu (marxhausen paul)
Subject: Re: Building effects units for guitars
Organization: University of Nebraska - Lincoln
Distribution: na
Date: Tue, 8 Sep 1992 16:47:30 GMT

bonobo@Ingres.COM (David Victor) writes:

>In article <1882d2INNov1@matt.ksu.ksu.edu> stites@matt.ksu.ksu.edu (Ross M Stites) writes:


>Other parts he uses (or direct equivalents) are still available.  I sure
>wish *somebody* would write a new version of this kind of book...10 years
>is a long time in electronics (well, maybe not *analog* electronics! ;-)

Well, a lot of stuff has gone digital in the interim, especially effects
that use time delay like echos, flangers, chorusers, etc.  However, there
are newer and better analog devices such as some of the newer bucket brigade
chips that make this stuff still possible to do as analog projects.  
I guess you also have to take into account how complex a project it is
practical for DIY folks to do, in terms of cost, time, and skill required;
it may not be real practical to do stuff much more complex than the widgets
Craig put in his original book.



I would definitely endorse this book, despite it's age, especially because
it gives step by step explanations for the utter electronic novice.
--
===============================================================================
paul marxhausen                              \/               grace 
university of nebraska - lincoln             /\              happens           
===============================================================================
From: hoffberg@phebos.aps.anl.gov (Mike G. Hoffberg)
Newsgroups: sci.electronics
Subject: TMS9914A GPIB Controller
Keywords: TMS9914, GPIB
Date: 9 Sep 92 22:08:29 GMT
Organization: Argonne National Laboratory, Chicago Illinois

What do I need to do to set the TMS9914A GPIB Controller into an
online state, i.e. turn the IFC line on.

I have tried:

setting swrst
setting interrupt Mask 0 to (BI+BO+ENDB)
writing the controller address (0x00)
setting IFC
clearing swrst
clearing IFC
sending remote enable

The above commands come from the TMS9914A data manual provided by TI.

I have also tried other combinations of the above commands to no
avail.  The only state that the controller seems to be in is with ATN
false (HIGH).

Any help would be appreciated.

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.            | 
Zippy was here              /__| |__\ Lab                  Obbyn! Obbyn!  _|_
Newsgroups: sci.electronics
From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: 120 HZ oscillator query
Organization: San Diego State University
Date: Tue, 15 Sep 1992 15:20:54 GMT

In article <1992Sep11.233617.12368@seanews.akita.com> finneyk@seanews.akita.com (Ken Finney) writes:
>From: finneyk@seanews.akita.com (Ken Finney)
>Subject: 120 HZ oscillator query
>Date: Fri, 11 Sep 1992 23:36:17 GMT
>
>I'm in need of an oscillator that puts out two square waves, 
>180 degrees out of phase, each one 60 Hz and 50% duty cycle.  
>My original idea was to use a MM5369 17 stage divider (with a
>7.15 MHz crystal it would generate a 120 Hz output) to drive
>a flip-flop to generate the two 60 Hz wave forms.  Unfortunately,
>the MM5369 doesn't produce a 50% duty cycle output.  So, does
>anyone know of a IC (or simple (ie: cheap) circuit) that is 
>designed to produce the signals I'm looking for?
> 
>Wave form A
>      |------|      |------|      |------|      |------|
>------|      |------|      |------|      |------|      |------
> 
>Wave form B
>------|      |------|      |------|      |------|
>      |------|      |------|      |------|      |------
> 
>Note: The "High" times of the two waveforms must not overlap,
>and it would be even nicer if they have a "break before make"
>characteristic.
> 
> 

No matter what the duty cycle is, when you send it through a FF, it becomes 
50%. As you know, FF's are edge sensitive, and Q; -Q, will give you the 
right signal.



Peace and Prosperity!
  ---==< 110 >==---
Xref: sparky sci.electronics:15572 rec.video:11213
From: killeen@spcvxb.spc.edu (Jeff Killeen)
Newsgroups: sci.electronics,rec.video
Subject: Re: Macrovision
Date: 12 Sep 92 05:17:25 GMT
Article-I.D.: spcvxb.1992Sep12.011726.3846
Organization: SPC Community Access System

In article <2859@perl-sun.dwrsun4.UUCP>, perl@dwrsun4.UUCP (Robert Perlberg) writes:
> In article <1992Sep2.133450.18671@panix.com>, schuster@panix.com (Michael Schuster) writes:
>> Macrovision inserts very bright pulses in the vertical blank interval.
>> Most VCR's use this when setting AGC video level, and get fooled into
>> thinking the video levle is much brighter than the picture area really
>> is. Most TV's don't. Dunno why.
> 
> Some years ago a VCR maker (forgot which one) came out with a machine
> which used a different kind of AGC circuit which was not affected by
> Macrovision.  It was not their intention to defeat Macrovision, it just
> worked out that way because Macrovision takes advantage of an
> unintended behavioral characteristic of the extant AGC circuit.  The
> Macrovision people complained and the VCR maker modified the new
> circuit so that it would reject a Macrovision signal.

Keep in mind 8mm and Hi8mm units are _not_ effected by Macrovision.  Owners of 
Sony GV-8/200/300/500's have long ago discovered this happy fact.  Also I 
believe all Beta units are safe from Macrovision.

And if case you are thinking of it...

	VHS tape -> 8mm tape -> VHS tape

... won't cut out the Macrovision.  Even though the 8mm VCR will play the tape 
back fine it still records the Macrovision junk.
Newsgroups: sci.electronics,comp.robotics
From: martinez@rodan.acs.syr.edu (Kenneth Mtz. (YONIX))
Subject: Micromouse
Originator: martinez@rodan.acs.syr.edu
Organization: Syracuse University, Syracuse, NY
Date: Tue, 15 Sep 92 11:01:50 EDT

 Hi, we are getting started on our senior project and have
 decided to work on a micromouse. We would greatly appreciate
 ANY piece of advice and information that could be useful.
 Also if someone has an updated version of the Competition
 rules that would help us also.

  Bibliography would be very helpful too.      

  More specifically what devices to use and/or what to avoid.

  If possible please reply to me personally. I will be posting 
  a summary if others are interested.

  Thanks in advance.

  Kenn
    
      

Newsgroups: sci.electronics