HDTenEightyP/NetNews huggingface dataset:
From: martin@space.ualberta.ca (Martin Connors)
Subject: Re: 8080/8085 Assembly Language Subroutines
Reply-To: martin@space.ualberta.ca (Martin Connors)
Organization: University Of Alberta, Edmonton Canada
Distribution: usa
Date: Fri, 9 Oct 1992 21:34:45 GMT

In article <1992Oct9.195213.12778@pasteur.Berkeley.EDU>  
getz@bistro.berkeley.edu (Neil Getz) writes:
> Netters-
> 
> Someone sent me a reply to my posting regarding my search
> for 8085 assembly language mathematics
> routines. Unfortunately our local mailer ate the message

The message was not from me however I wanted to suggest trying to get the
SCELBI Cookbook which exists for the Z80, the 8080, and possibly the 8085.  
The SCELBI Cookbook has lots of math routines. If you get the Z80 version  
it should not be too hard to convert over the mnemonics.

Maybe somebody can give a more exact reference to this. I don't know if  
SCELBI still exists - they went from making computers to writing about  
them to (possibly) oblivion. The Z80 cookbook came out about 1979 or so.

--
Martin Connors         |
Space Research         | martin@space.ualberta.ca  (403) 492-2526
University of Alberta  |
From: rwc@ius4.ius.cs.cmu.edu (Randy Casciola)
Newsgroups: sci.electronics
Subject: Re: Need Help with Op-Amps
Date: 7 Oct 92 19:35:05 GMT
Article-I.D.: cs.BvrnqJ.8H0.2
Organization: CMU Vision and Autonomous Systems

>I just finished an Electric Circuits Lab and one of the circuits
>involved an op-amp where the op-amp had its two bipolar power supply
>connections, and a signal generator was feeding a sine wave into the
>non-inverting input of the op-amp.  Then, a direct connection was made
>from the output to the inverting input and the gain was measured.  It
>was found that there was no change in the gain.  Then, the same
>circuit was used but instead of the piece of wire going from the
>output to the inverting input a 27k resistor was used and the gain
>remained the same although one would have thought it would
>decrease.(At least I did anyway!)  Is this because there was no second
>resistor that would normally have gone from the inverting input to
>ground?  That is all I can come up with because the formula to
>calculate gain is Afb=(Rf)/(R1) + 1 for closed loop gain.
>Can anyone verify that my assumption is correct or not?
>                                  Thanks, Rob

Your last statement is correct.  Since there is no resistor you call
R1, it is effectively a resistor of infinite resistance.  If you 
substitute infinity into your equation, you'll find that the (Rf)/R1
term -> zero and you are left with Afb=1, just like the case when you
used a wire and Rf=0.  A qualitative way of looking at this is as
follows.   First assume an ideal op-amp.  i.e., there should be no 
current flowing into the inverting terminal.  With the wire, the voltage
at the inverting terminal is the same as the output since they are
shorted with the wire.  The same conditions exist with the 27k resistor
since with the ideal op-amp no current flows into the inverting 
terminal, so there is no current flowing through the resistor, so there
is no voltage drop accross the resistor, so the output voltage equals
the voltage at the inverting terminal.  The results are identical to the
results when the wire was used.

Randy
From: bame@hpfcbig.SDE.HP.COM (Paul Bame)
Newsgroups: sci.electronics
Subject: Re: Automotive sensors
Date: 12 Oct 92 20:26:43 GMT
Organization: HP SESD, Fort Collins, CO

In sci.electronics, gpxpost@otago.ac.nz writes:

> The second sensor is a bit more tricky. I need to know the 
> orientation of the car, i.e. north-south-east-west. It would be 
> better if the sensor gave an absolute reference rather than relative, 
> then if the power fails the computer won't lose its orientation.

> On possible solution is to keep track of the steering wheel angle, 
> but this could be inaccurate. It depends on how fast the car is 
> travelling how much it turns, and it is possible for the car to skid, 
> then I don't know what direction it is facing.

> Anyone done this before, or got any ideas?

A US (California?) company called E-Tac(?) did something similar for
providing a moving-map display for motorists.  The first incarnation
used a rotation sensor on both front (or rear) wheels and derived both
distance travelled and direction (from differential counts).

If all you need is orientation perhaps some sort of compass, flux-gate
or otherwise.

    -Paul Bame N0KCL
Newsgroups: sci.electronics
From: mdk@col.hp.com (Mark Keisling)
Subject: Re: Voice-operated Universal Remote Control
Date: Wed, 14 Oct 1992 18:43:00 GMT
Organization: HP Colorado Springs Division

gay@venice.sedd.trw.com (Lance Gay) writes:
> I just heard an advertisement on the radio for a voice-operated universal
> remote control.  The sample in the advertisement was to speak the words
> "RECORD CHANNEL 2 SUNDAY 9 P.M. TO 11 P.M.", which would set your VCR
> to record a movie.  You were told to dial an 800 number (i believe the
> number was 800-VCR-VOICE) to get a free brochure, so I guess it is not 
> in stores yet.  Anyone have any details?
> 
> Lance J. Gay                                 Internet: gay@venice.sedd.trw.com
> TRW Systems Engineering & Development Div.   Phone: 310-764-3988
> Carson, CA  90746


I just saw an announcement for such a device in the Video Magazine I received
yesterday.  You might check out the Novemeber issue.

Mark.
From: pauls@trsvax.tandy.com
Date: 12 Oct 92 17:08 CDT
Newsgroups: sci.electronics
Subject: Re: need MIDI merger help
Message-ID: <288200020@trsvax>
Nf-ID: #R:usenet.INS.CWRU.Edu:3:trsvax:288200020:000:298
Nf-From: trsvax.tandy.com!pauls    Oct 12 17:08:00 1992


The best processor is an 8051 or 8031 with external eprom. The code is
tricky, since you need to have 2 FIFOs and a ring buffer. THe FIFOs are
need since each MIDI channel is asynch to the other. Also, if both are
going "full blast" something as to have priority, so you have to invent a
protocol.

Newsgroups: sci.electronics
From: sap@sactoh0.sac.ca.us (Stephan A. Puga)
Subject: MODEM and phone line
Organization: Sacramento Public Access Unix
Date: Tue, 13 Oct 92 20:04:17 GMT

I have purchased a new Supra modem, but when it tries to "pick up"
the phone it does not get a signal.  I am pretty sure that there is
nothing wrong with the modem because it  has no problems at my
work.  Therefore I have concluded that there is something wrong
with my house line..  If anyone can give me any information on
phone lines(voltages and testing ideas) I would be very
appreciative.  Thank you.

				Stephan A. Puga

-- 
#############################################################
# "Its been surreal!"         #     sap@sactoh0.SAC.CA.US   #  
#     -- Gogo Dodo            # UUCP=..ames!pacbell!sactoh0 #
#############################################################
Newsgroups: sci.electronics
From: arm@helix.nih.gov (Andrew Mitz)
Subject: Re: what's a SAW?
Followup-To: sci.electronics
Keywords: see the saw
Organization: National Institutes of Health, Bethesda
Distribution: usa
Date: Tue, 13 Oct 1992 15:52:03 GMT

In article <1992Oct9.130946.4960@phx.mcd.mot.com> hbg6@phx.mcd.mot.com (John Schuch) writes:
>Could someone explain what a SAW filter is and what it is used
>for? ( the $.25 explanation will do )

Surface Acoustical Wave device.  Charges are pushed through a semiconductor
device using its mechanical properties.  SAW devices are typically used
to make radio-frequency oscillators and filters.

$.25 please!



-------------------------------------------------
Andrew Mitz          |    NIH Animal Center
Biomedical Engineer  |    Poolesville, MD
-------------------------------------------------

All opinions expressed are my own.
From: fullmam@ece.orst.edu (Mike Fullman)
Newsgroups: sci.electronics
Subject: HELP!!!  I need a Motorola DSP56ADC16S  16 bit a-d converter
Date: 14 Oct 92 06:26:24 GMT
Distribution: na
Organization: Oregon State University, Corvallis

Help, I am working on a digital signal processor for my senior project and
I need a chip desperately.  I have already designed and wired up the board
but can't seem to get one chip.  The chip I need is the Motorola

      DSP56ADC16S

This is a 16 bit A/D converter that oversamples, digitally filters, and
decimates all in one convenient package.

I already tried all six of the Motorola distributors and queried the sales
office for samples or sources...  Same answer.. No chips for 11 weeks.
I would talk to their university support people but I know that is at least a
three month turn around.

If you have any of these laying around I would be very interested.  
Compensation is negotiable.

Thanks, 

Mike Fullman
From: elmquist@pez.ssesco.com (Chris Elmquist)
Newsgroups: sci.electronics
Subject: Re: RF to A/V
Keywords: cable, RF, A/V
Date: 15 Oct 92 14:18:36 GMT
Distribution: na
Organization: SSESCO

In article <1992Oct15.133811.7126@cbfsb.cb.att.com> wee@cbnewsb.cb.att.com (william.e.erickson) writes:
>
>The set top box supplied by my cable company is RF output only.  Is there
>a device available to 'convert' this to baseband (A/V jacks)?  The cable
>box must be used as channel selector, this cable company scrambles 
>everything.
>
>                   ----------        ----------          -----------
>      From         | Cable  |        |        |---(A)--->| Monitor/|
>      Street(RF)-->|  Box   |-(RF)-->|?device?|          |   TV/   |
>                   |        |        |        |---(V)--->|   VCR   |
>                   ----------        ----------          -----------
>
>Thanks for any info, Bill.

You can purchase (see ads in the back of Popular Science, Popular Mechanics,
etc) CATV tuners that have a baseband video and MONO audio output.
You could put one of these tuners after your Cable Co.  supplied box and tune
it to the output of said box.  I have done this...  but you can't get STEREO
audio this way.

I'd like to find one of these:

                        ----------          -----------
                        |        |---(AR)-->| Monitor/|
                -(RF)-->|?device?|---(AL)-->|   TV/   |
                 (CH3)  |        |---(V)--->|   VCR   |
                        ----------          -----------

where we'd get Audio(Right + Left) and Video out of the ?device?.  The ?device?
would ideally be a high quality tuner (that might only tune to channel 2, 3, or
4) and decode MTS stereo transmissions.

Has anyone seen one of these ?

Sorry to answer a question with another question...

Chris
Chris Elmquist, N0JCF
elmquist@SSESCO.com
73267.2711@Compuserve.com
(612)342-0003@work (8am-5pm CST6CDT)
From: bob@kc2wz.bubble.org (Bob Billson)
Newsgroups: sci.electronics
Subject: Looking for X-10 controller
Summary: anyone have a used one they don't use?
Keywords: X10
Date: 13 Oct 92 07:30:05 GMT
Distribution: usa
Organization: Color Computer 3: Tandy's 'game' machine

I am looking for an X-10 controller.  The type which plugs into an RS-232
serial port.  BSR made these things which software for Mac's, MS-DOS and ??
systems.  I just need the hardware, not the software.

DAK used to sell the thing for $20, but they no longer seem to.  I think
Sears used to sell them for ~$40.  Tandy will sell it to you for $60 (why
doesn't Tandy's highest price suprise me? :-) )

Does anyone have a used one (working!) which they no longer want?  I may also
be interested in any X-10 modules you may have as well, but the controller is
my primary need.

Thanks... Bob
-- 
  Bob Billson, KC2WZ                          | internet: bob@kc2wz.bubble.org
  $nail:  21 Bates Way,  Westfield, NJ 07090  | uucp:     ...!uunet!kc2wz!bob

  "Professional ear piercing--while you wait!"  --sign in local jewelry store
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: C Cross Complier for 68HC11 
Date: Mon, 12 Oct 1992 19:06:37 GMT
Organization: U of Toronto Zoology

In article <1992Oct12.065939.3280@rtfm.mlb.fl.us> luckey@rtfm.mlb.fl.us (Jon Luckey) writes:
>P S.  I've always wondered if they had a way to use GNU's
>gcc as a cross compiler for embedded systems

My understanding is that there's not much hope for this, because GCC has
some definite prejudices about the type of machine that it's compiling
for, and "at least 32 bits" is one of them.
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics
From: "Duc-Nghiep VO" <CT61@music.mus.polymtl.ca>
Subject: RockWell design
Organization: Ecole Polytechnique de Montreal
Date: Thu, 8 Oct 1992 20:28:27 GMT

hi,
Can somebody here send me all doc on the Rockwell chipset ?.
and their address too.
Thanks in advance


=================================================================
  Duc-Nghiep VO                        CT61@MUSIC.POLYMTL.CA
  Ecole Polytechnique de Montreal      CT61@POLYTEC1.BITNET
=================================================================
From: klimasewski@fccvde.enet.dec.com (My name is...)
Newsgroups: sci.electronics
Subject: need cross reference/2SC3068
Date: 8 Oct 92 14:25:40 GMT
Organization: Digital Equipment Corporation


What is a cross reference for a 2SC3068??


Where can a I buy a 2SC3068??

                                   thanks,
                                     Ken
From: sngattan@matt.ksu.ksu.edu (The Almighty)
Newsgroups: sci.electronics
Subject: Ultrasonic Transducer?
Date: 10 Oct 1992 18:45:20 -0500
Organization: Kansas State University
Distribution: world
NNTP-Posting-Host: matt.ksu.ksu.edu

Hello:

	I am presently using an Instrument Grade Transducer from
Polaroid Corp to measure the distance between the transducer and
the target area.  Has anyone had an experience with an ultrasonic
transducer?  Is there any other co. that I can contact and get
more information to achieve more accuracy in my measurements?
Thanks for all the information I can get. Bye

			sanjay
			sngattan@matt.ksu.ksu.edu
From: schumach@convex.com (Richard A. Schumacher)
Newsgroups: sci.electronics
Subject: Re: Smith Chart
Date: 8 Oct 92 18:02:05 GMT
Article-I.D.: convex.schumach.718567325
Organization: CONVEX Computer Corporation, Richardson, Tx., USA
X-Disclaimer: This message was written by a user at CONVEX Computer
              Corp. The opinions expressed are those of the user and
              not necessarily those of CONVEX.

[request for a Postcript format Smith chart by e-mail deleted]

Presumably this was produced under license from the
patent and copyright holder? I doubt it.

Don't cheat the inventor and his heirs. Go out and
buy a licensed copy. The patent rights and royalties 
you protect may be your own.
From: sh09@ns1.cc.lehigh.edu (STEVEN HIGGINS)
Newsgroups: sci.electronics
Subject: 'e: Student version of SPICE???
Date: 16 Oct 92 02:14:14 GMT
Organization: Lehigh University

In article <1992Oct13.215546.12538@eng.ufl.edu>, iqbal@kaw.eel.ufl.edu (M.Iqbal)
 writes:
>In article <BvzJEK.922@news.cso.uiuc.edu>, rky57514@uxa.cso.uiuc.edu (Tall Cool
 One ) writes:
>|> huey@athena.mit.edu (Huy Le) writes:
>|>
>|> >In article <1992Oct9.143138.203047@uctvax.uct.ac.za>, clrmic08@uctvax.uct.a
c.za writes:
>|> >|> Is there a student or demo version of SPICE around. If so where can I ge
t
>|> >|> a copy from ? An FTP site would be the most convenient.
>|> >|> Thanks
>|> >|> Mike
>|>
>|>
>|> >I know the company MicroSims in California does send out free demo
>|> >copies of Spice, but I dont have their address off hand.
>|>
>|>
>|> >HL
>|>
>|> You can get PSpice from wuarchive.wustl.edu.  It's in pub/msdos/electrical,
I
>|> think.  I got an evaluation copy of PSpice from there.  Good luck!
>|>
>
>That is not the right path. The pspice is under mirrors/msdos/electrical
>
>
>--
>
>------------------------------------------------------------------
>
>                                                >><<<     >>><<<<
>Iqbal@sioux.eel.ufl.edu                                 (o o)     (o) (o)
>University of Florida                           [ | ]        |


Just thought I'd mention an alternative to all of the students out there who
want a version of SPICE.  EDN magazine offers several SPICE programs that are
ports of Berkeley SPICE to MSDOS land.  One of the programs they have is
specifically for 386 and up machines, and is SPICE 3 based, not SPICE 2 based.
 As far as I know, these programs are fully functional, and don't have limits
 placed on number of nodes or components, etc.  Just remember that they are
 direct ports from the original code, so they haven't been massaged to fix
 errors like MicroSim has done with PSpice.  EDN BBS number is 617-558-4241,
 and access is free.  >                                                  -         ---
>
-- 
 ***********************************************************************
*   Steve Higgins      *                                                *
*   MSE Department     *    A lot of people are afraid of heights...    *
*   Lehigh University  *    Not me.  I'm afraid of widths....           *
*   Bethlehem, PA  USA *             --Steven Wright                    *
*   sh09@lehigh.edu    *                                                *
*   (215) 791-7299     *                                                *
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Wed, 7 Oct 1992 19:03:55 GMT
Subject: Re: Continuous Power
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

> :  The CRT is the shortest-lived part in the display by a wide margin,
> 
> maybe at HP :-)
> most of the 'display' failures i've seen have been power supply related.
> 
> we are 'nursing' our last-surviving DEC regis-capable terminal
> by leaving it on all the time
> 

Well, actually, it depends on what you mean by "life."

A true, hard failure in a CRT (i.e., it simply doesn't work anymore) IS
fairly rare.  But CRT lifetimes are generally quoted in time to half-bright.
You may not consider half the original brightness to be a "failure", as it
happens so gradually that most folks won't notice it UNTIL they put a new
unit next to the old one.  But the typical tube reaches this point in
something like 10k-20k hourse, whereas there's no reason that the rest of
the monitor (if designed properly) shouldn't have at least a 40k-50k MTBF.


Bob Myers               |   User Interface Technology Div.
myers@fc.hp.com         |   Hardware R&D - Display Dept.        
                        |   Ft. Collins, Colorado
Newsgroups: sci.electronics
From: d89marho@ide1.curofix (Martin V. Howard)
Subject: Information sources needed for audio electronics
Organization: /home/kolix2/elev/d89/d89marho/.organization
Distribution: sci
Date: Fri, 9 Oct 1992 12:20:52 GMT



I'm a university student and I can't afford to buy the kind of HiFi
system that I want, so I have decided to build it.  The cost is
(hopefully) lower, but more importantly, spred out over a longer
period of time.  From what I've understood, valve amps use simpler
circuit designs than transistor or integrated circuit amps, plus I
love the sound I've heard from the valve amps I've listened to.

What I need is pointers to books or magazines from which I can learn
the audio electronics needed to start building valve amps.  I thought
I'd start out easy and get a simple something that works, before I
build the X2000-A4 150W class A valve amp of my dreams... :)

I've studied some basic electronics here at the university, but I
can't remember much about it, nor am I particularly adept at
mathematics.  If there is a good book that teaches audio electronics
from the basics, I'd be very interested indeed in reading it.

I primarily intend to play CDs, so I thought that I could settle for a
descent class A valve power amp and between the CD and the amp I'd use
a simple attenuator and buffer.  I have some designs for this that I
could use.  However, I'm interested in learning about pre-amp design
too, since I do have an old trusty 'vinyl lathe'.

Martin V. Howard

--
Programming isn't a science,        | Foo:    mvh@lysator.liu.se
it's an art.                        | Bar:    d89marho@und.ida.liu.se
Why is it called common sense,      | 
when so few possess it ?            | Voice:  Int +46 (0)13 261 283 (GMT + 1h)
From: dave@dlb.com (Dave Buck)
Newsgroups: sci.electronics
Subject: Re: BSR boxes
Keywords: x10
Date: 15 Oct 92 23:45:06 GMT
Reply-To: dave@dlb.com (Dave Buck)
Organization: D.L.Buck & Associates, Inc.; San Jose, Calif.

In article <1992Oct13.234643.28776@mprgate.mpr.ca> walduck@mpr.ca (Andrew Walduck) writes:
>Does anyone out there have documentation for the BSR switch boxes...?
>(these are the little boxes that plug into outlets, or replace switches,
>to allow you to control the device remotely...the controller transmitted
>RF on the ac power lines...and the remote box received it...)

BSR is the old name for X-10 USA, Inc., whose stuff is remarketed
by Radio Shack as Plug-n-Power, and by Stanley and Leviton and so on.
Andrew, I'm sending you a summary of the X-10 protocol by e-mail, as well
as info on how to get more info from the intelhouse archive server.
(Intelhouse meaning Intelligent House, not related to Intel)
-- 
Dave Buck   dave@dlb.com   {amdahl,ames,daver,netcomsv,sun,zygot}!dlb!dave
D. L. Buck and Associates, Inc.;   San Jose, California;    (408) 972-2825
Newsgroups: sci.electronics
From: peterlew@bnr.ca (Peter Lew)
Subject: ZX80 Adapter Pinout
Keywords: ZX80
Reply-To: peterlew@bnr.ca (Peter Lew)
Organization: Bell-Northern Research Ltd.
Date: Tue, 13 Oct 92 19:20:36 GMT

Does anyone remember a small computer put out by Sinclair
called ZX80? I was rummaging through my electronic junk pile
and found the little guy and I thought I might try to re-use
it as a controller. There is a large connector in the back
which looks like it might have been used as an expansion slot,
I was wondering if anyone would happen to know what the port
is for and what the pinout is?

Many thanx

Peter Lew

IP Address under construction


Newsgroups: sci.electronics
From: vnelson@ccu.umanitoba.ca (Gerald Vernon Nelson)
Subject: Re: Serial line booster
Organization: University of Manitoba, Winnipeg, Canada
Date: Tue, 13 Oct 1992 01:46:46 GMT

In <1992Oct12.185855.2700@njitgw.njit.edu> dcg5662@hertz.njit.edu (Dave Grabowski (KxiK)) writes:


>  Well, there's a couple things you can do. You could check the "weak"
>serial card and see if it has a power supply that could use some
>upgrading, or perhaps a bad driver (75188, 1488, I think). Your other
>alternative would be to either buy or make boosters. About a year ago, I
>had to run a serial line from the 3rd to the 26th floor of Merrill Lynch
>in New York City for their cash register to a backroom computer. Using
>RS-232 to RS-422 booster boxes at both ends purchased from B&B
>electronics, the connection was perfect at 9600 baud.

>-Dave

I have to ask, did you try it without the boosters?
In your application, you haven't shortened the length of 
cable between transmission points. If your boosters are 
retransmitting at RS-232 levels, then they aren't really 
doing much.  (If they raise voltage levels, then disregard this)

I used to work for a Computer Services Dept at a University.
Part of my job was connecting people from all over campus to 
the mainframe.  Trust me, you should be able to run RS-232 at 
least 500 feet over twisted pair wire without a glitch. (at 9600)

Vern Nelson