HDTenEightyP/NetNews huggingface dataset:
From: byron@cc.gatech.edu (Byron A Jeff)
Subject: Re: GAL Programmer using 68HC705K1 - UPDATE
Organization: Georgia Institute of Technology
Date: Sat, 15 Aug 1992 15:47:08 GMT

In article <1992Aug15.043342.15538@ssc.wa.com> markz@ssc.wa.com (Mark Zenier) writes:
>In article <1992Aug13.181531.3150@cc.gatech.edu> byron@cc.gatech.edu writes:
>>5. And Finally - a FLAME
>
>Hmm, having just reread the offending posting, I didn't get that 
>impression at all.  The poster said that he had been there himself
>and that you would save time.
>

I'm sorry Mark. It wasn't a post but E-mail I received. The author stated
point blank that I was wasting my time because only experts can spend time
engineering such a project. All the postings that I've seen have been
favorable.

>And read the posting again and ask, just given the information
>in the April Elektor article, 1) how the programmer knew the 
>part was made by National, and 2) why the Elektor project
>differentiates between the original and A version parts.
>Not to mention more mundane things like what is the layout of 
>the Jedec fuse map for the different parts.

I'm sure that's just software that reads signature info from the part.
For my purposes I'm perfectly happy to be able to program only one class
of parts.

I've examined the Elektor project and I find it to be very good. It just
doesn't serve my purpose as given so I'm modifying it a bit. I just
resented the fact that instead of offering good advise that some certain
folks have to be critical without having all the facts. 

Again thanks for all the helpful hints I've received.

>
>Mark Zenier  markz@ssc.wa.com  
>

BAJ
---
Another random extraction from the mental bit stream of...
Byron A. Jeff - PhD student operating in parallel!
Georgia Tech, Atlanta GA 30332   Internet: byron@cc.gatech.edu
From: "wayne kelso" <wayne.kelso@canrem.com>
Newsgroups: sci.electronics
Subject: line level matching
Date: 13 Aug 92 00:27:49 EST
Reply-To: "wayne kelso" <wayne.kelso@canrem.com>
Distribution: sci
Organization: Canada Remote Systems

I've been using a stereo 10k pot to trim a +4 mixer's output level to 
match with a -10 PCM input. Is there a better way to do this, whether it 
be a passive or active circuit?
I'm assuming that it is better to attenuate the signal past the mixer's 
fader, rather than just pull the mixer's fader's back. 
Any circuit ideas would be most welcome.

Wayne.Kelso@canrem.com

---
 * Freddie 1.2 * Sticks and Stones may break my bones, so quit it.
--
Canada Remote Systems  - Toronto, Ontario/Detroit, MI
World's Largest PCBOARD System - 416-629-7000/629-7044
Newsgroups: sci.electronics
From: cscc13@judy.uh.edu (NAVEED IQBAL)
Subject: How can I send a bit to an optocoupler connected tp PC
News-Software: VAX/VMS VNEWS 1.41    
Organization: University of Houston
Date: Thu, 13 Aug 1992 23:51:00 GMT

I want to write a program in C to turn on a relay controlled by an 
optocoupler. I want to connect the coupler to a Pcs serial/parellel 
port.
- What would be the pinout?
- How can I do that in C?
  - or another language?
- I don't want to use those interface boards as I can't afford to.



Thanx
Naveed Iqbal
NIqbal@uh.edu


Newsgroups: sci.electronics
From: jon_sree@world.std.com (Jon Sreekanth)
Subject: Re: CMOS Oscillator
Organization: The World
	<MJOHNSON.92Aug18140900@netcom.Netcom.COM>
Date: Wed, 19 Aug 1992 16:33:20 GMT

In article <MJOHNSON.92Aug18140900@netcom.Netcom.COM> mjohnson@netcom.Netcom.COM (Mark Johnson) writes:


   In article <1992Aug18.140051.10073@donau.et.tudelft.nl> elmar@dutentb.et.tudelft.nl (Elmar van Ginneken) writes:
      > What I am looking for is a low power oscillator (<.5 mA @ 5V) running
      > at a frequency of roughly 1 MHz.
      > However, the frequency-determining component should be an inductor with


Check out Horowitz and Hill, Art of Electronics, Cambridge University
Press, ISBN 0-521-37095-7. Check the index under oscillators, or the 
chapter on low power design. Also, there are some PUT (Programmable
Unijunction Transistor) circuits shown there. 

/ Jon Sreekanth

Assabet Valley Microsystems, Inc.           |  Fax and PC products
5 Walden St #3, Cambridge, MA 02140         |  (617) 876-8019
jon_sree@world.std.com                      |
From: rhaar@albert.cs.gmr.com (Bob Haar)
Newsgroups: sci.electronics
Subject: Re: Re: GPS Availability
Date: 14 Aug 92 12:31:49 GMT
Reply-To: rhaar@albert.cs.gmr.com
Organization: G.M. Research Labs

In article 7480107@hpfcso.FC.HP.COM, myers@hpfcso.FC.HP.COM (Bob Myers) writes:
|>> GPS.....That's on UTC, isn't it?
|>> 
|>>         Honestly, I've had my license for about 2 years...and every single
|>> time I've heard the GPS thing, they have always said it wasn't operational,
|>> etc....I don't think I've ever heard an actual report for GPS....Oh
|>> welll....
|>>         That probably wasn't much help, but.......
|>
|>GPS is most definitely operational, and GPS receivers are now readily
|>available, albeit with less accuracy than their military cousins. 

GPS systems have been available for private aviation and marine
uses for a number of years. There are some systems for use
in land vehicles coming on the market now. (I just saw an announcement
for a Sony system for a bit over $1000.) And there are reports of
versions small enough to be carried hiking that will be out in a
year or two.



---
	Robert Haar               InterNet : rhaar@gmr.com 
	Computer Science Dept., G.M. Research Laboratories
DISCLAIMER: Unless indicated otherwise, everything in this note is
personal opinion, not an official statement of General Motors Corp.


Newsgroups: sci.electronics
From: gude@uniwa.uwa.edu.au (David J W Emrich)
Subject: Re: green screen - sometimes
Organization: University of Western Australia
Date: Wed, 12 Aug 1992 13:38:23 GMT

barkman@gamma.is.tcu.edu (MYLES BARKMAN - KG5AI TX A&M U) writes:

>OK, since we're on the subject of green TV screens, I got one for the group.

Lots of useful fault-desription stuff deleted...

The problem could be in one of several areas!  The only thing you failed
to mention was the model of the TV!  This can be critical, as some sets
have a calibration mode where the Red and Blue signals are cut (usually
by the tech flipping a switch inside the guts of the TV), so that just
one gun is shooting, then the convergence, etc, can be adjusted for the
general conditions, and the red and blue can then be brought back in to
be calibrated against the green.  Also, some various diagnostic modes on
some models, involve just the green gun.  It is possible (especially in
more recent sets) that the hi-volts got into the switching ciruitry that
controls these modes, and the set is simply flickering in and out of the
relevant mode.

A completely different option is that the hi-volts surged through the
tuner into the i/f stages, and played havoc with the color separator
circuitry.  I.e. the decoder may be coughing every now and then and
forgetting to decode the red and blue (I am not sure on this, I can't
remember enough of my Tele 100 course, I know the colors are mixed into
a chroma and luminance type signal,  but someone somewhere breaks out
red, green and blue from them).

An entirely different possibility is that the "wire" that the tech
spotted and repaired was only one of a few that got zapped.  I have
fixed a set from similar circumstances that had a yoke coil lead zapped
off by lightning (how? Dunno, came in the antenna socket, went all over,
and that was the only thing that gave out, at least that we found).  The
effect of this was that the vertical deflection got killed, and we had a
mezmerising colored line halfway down the tube face, from left to right!
A quick solder job, on the lead (with interestingly charred insulation
at the yoke end!), and the set went fine.  Far as I know, still going
too, about 8 years down the track.

So you can see, the problems are potentially all over, and the model of
the set may help, since there are "known weaknesses" for particular
models.

Hope this is a start to more useful info.



[dav]    aka
David Emrich
gude@uniwa.uwa.edu.au
Newsgroups: sci.electronics
From: markz@ssc.wa.com (Mark Zenier)
Subject: Re: GAL Programmer using 68HC705K1 - UPDATE
Organization: SSC, Inc., Seattle, WA
Date: Sat, 15 Aug 1992 04:33:42 GMT

In article <1992Aug13.181531.3150@cc.gatech.edu> byron@cc.gatech.edu writes:
>5. And Finally - a FLAME
>   This is for the one person who suggested that I'm wasting my time and
>   that I should just get the the Elecktor kit. I work on projects like
>   this programmer because I am a hobbyist. This means:
>...
>   The bottom line is that I'm not a sheep. I like to roll my own stuff and
>   push projects in new a interesting directions. So give the "just follow
>   the experts like sheep" line a break. Nothing ventured, nothing gained.
>

Hmm, having just reread the offending posting, I didn't get that 
impression at all.  The poster said that he had been there himself
and that you would save time.

And read the posting again and ask, just given the information
in the April Elektor article, 1) how the programmer knew the 
part was made by National, and 2) why the Elektor project
differentiates between the original and A version parts.
Not to mention more mundane things like what is the layout of 
the Jedec fuse map for the different parts.

Mark Zenier  markz@ssc.wa.com  

Newsgroups: sci.electronics
From: kpc@panix.com (Kevin Centanni)
Subject: Looking for Lapbelt Supplier(s)
Date: Fri, 21 Aug 1992 18:13:53 GMT
Organization: PANIX Public Access Unix & Internet, NYC

I am looking for a supplier of airplane-style seatbelts that have some
sort of switch mechanism that provides some sort of output when the
seatbelt is latched.  I'e done searches on CompuServe's Business Yellow
Pages under the heading 'seatbelt' and come up with nothing.
 
I guess I could run some kind of wire along the underside of the canvas
strap that would close an electrical circuit when the metal seatbelt
latch is closed.  I don't know where to even begin to get such a seatbelt
though.
 
I'm looking for a LAPBELT as oppoed to a SHOULDER HARNESS (like in the
front seat of automobiles).
 
Thanks...


-- 
Kevin P. Centanni
Corporate Communication Group
212.268.2100
kpc@panix.com       {cmcl2,apple}!panix!kpc
Newsgroups: sci.electronics
From: sja@world.std.com (Stuart J Adams)
Subject: Wanted: CRT Tube for TEK 2215 Scope
Organization: The World Public Access UNIX, Brookline, MA
Date: Tue, 18 Aug 1992 20:57:45 GMT

I am looking for a replacement CRT Tube for a TEK 2215 Scope. 
Can anyone help me ????

Thanks,
Stuart Adams
sja@world.std.com

Xref: sparky sci.electronics:14570 comp.sys.mac.hardware:15523
From: peter@norge.UUCP (Peter Espen)
Newsgroups: sci.electronics,comp.sys.mac.hardware
Subject: Re: PowerBook 100 LCD screen replacement, the sad conclusion
Date: 19 Aug 92 02:18:04 GMT
Followup-To: sci.electronics
Organization: Norge International, Albuquerque, NM

In article <1992Aug18.162134.14701@mcs.drexel.edu> uyyifrah@mcs.drexel.edu (Y Yifrah [y^2]) writes:
>I remember when PC compat "laptops" first came out, GRiD was one of the first
>manufacturers of them, they made them TOUGH (so tough that make them to milspec
>now for the Armed forces) but they cost about 4 time more that way... Having
>.............
>
>Look at it this way, would you rather have a PB 100 with a plasic casse at
>$800, or a Magnesium cased one with all sorts of shock control internals,
>platium connects, the works for proabably triple or 4 times the cost...
>
>-- 
>                                        Yoram Yifrah -- uyyifrah@mcs.drexel.edu
>

	We have a GRiD laptop at work for a job we are doing for a government
facility. It has one of those Magnesium cases and IS designed to withstand
a whole lot of G shock.....BUT it weighs a TON as laptop standards go. I
think it probably even weighs a least twice as much as the original Mac
Portable!!

	Peter Espen

--
         _____  _____           
  ---   /    / /                  |            Peter Espen            |
   --- /    / /                   |  ...unmvax!bbx!yenta!norge!peter  |
---   /____/ /___                 |     norge!peter@yenta.alb.nm.us   |
 --- /      /     ---             |         peter@norge.UUCP          |
--  /      /      ---             |                                   |
 - /      /____
From: gerry@bluemoon.rn.com (Gerard M. Foley)
Newsgroups: sci.electronics
Subject: AEA-FAX
Date: 13 Aug 92 21:16:28 GMT
Organization: Blue Moon BBS ((614) 868-998[024])


   My little gadget stopped working after a thunderstorm.
For those who do not know what it looks like, it is about 
2inches square, and is essentially a DB25 splicer, with
male on one end, female on the other, and a shielded cable
terminated in a miniature phone plug coming out the side.
   If you put in in series with anything connected to an
"IBM-Compatible" serial port, and run the accompanying
software, you can get pictures from radio facsimile signals.
It gives gray scale, 16 steps, and can provide pretty nice
looking pictures from NAM, Norfolk Va, relaying weather
satellite images and maps.  A similar gadget for about the
same price is sold by Software Systems Consulting of
San Clemente, CA.
   Since it seemed busted anyway, I just now pried it open.
I have not finished tracing the schematic diagram of it,
but believe it or not, it containes the following parts,
and no more:  1 Dual Op-Amp  5 resistors  4 diodes 4
capacitors! (Sorry for the spelling of "contains" up
there).  There's magic in electronics!

 This is from
     gerry@bluemoon.rn.com
who doesn't have his (or her) own obnoxious signature yet
Newsgroups: sci.electronics
From: s2859479@techst02.technion.ac.il (Yaron Keren)
Subject: SUMMARY: 220V ac -> 6V DC @ 1mA, how?
Reply-To: s2859479@techst02.technion.ac.il (Yaron Keren)
Organization: Technion, Israel Inst. of Technology
Date: Tue, 18 Aug 1992 05:24:48 GMT

The disadvantages thought are:

1. The circut is dangerous as the mains suppply.
2. If the zener dies, you get 220v instead of 6...

Other configurations suggested are : 
diode-resistor-zener diode
capacitor-diode bridge-resistor-zener

The best solution seems to be a ready made chip:

"There is also A ready made chip for genrationg regulated low voltage
directly from mains. Harris have announced HV-2405E chip. It generates
regulated 5 to 24V voltage at currents up to 50mA from mains voltage.
The operating voltage is 30-264Vrm AC. The chip is in 8 pin DIP package
and needs 3 capacitors and one resistor to make +5V DC power supply."

This chip sounds like the right thing. 
Thanks to all who replied.

Yaron
-- 
Yaron Keren                                 s2859479@techst02.technion.ac.il
From: kevins@donald.ee.pdx.edu
Newsgroups: sci.electronics
Subject: PROM durability (ESD-wise)
Date: 20 Aug 92 05:17:36 GMT
Article-I.D.: pdxgate.6009
Reply-To: kevins@donald.ee.pdx.edu ()
Organization: Portland State University

How immune are bipolar PROM's (low density (32x8)) to harsh environments?
Are they as sturdy as general LSTTL?  Any worse than CMOS?  Which pins
are the succeptable ones:  VCC, GND, Addr, Data, OE?

All but the address pins are connected to the outside (for insertion into
a connector).  How can I protect the device so that it has better chances
of surviving human (non-grounded) environments?

Any and all help will be greatly appreciated.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Kevin B. Stanton			Internet: kevins@ee.pdx.edu
Portland State University		Dept. of Electrical Engineering
(503) 725-5422				Box 751, Portland, Oregon  97207
From: paulh@minster.york.ac.uk
Newsgroups: sci.electronics
Subject: Re: LED "Power-indicators"
Date: 20 Aug 92 07:58:18 GMT
Organization: Department of Computer Science, University of York, England
X-Newsreader: Tin 1.1 PL5


    Check out the LM39xx series of bargraph display drivers
    +
    Investigate bandpass filters.

    H
Newsgroups: sci.electronics
From: wlsmith@valve.heart.rri.uwo.ca (Wayne Smith)
Subject: What's a good price for a 4 channel 100 MHz analog scope?
Organization: The John P. Robarts Research Institute, London, Ontario
Distribution: na
Date: Fri, 21 Aug 1992 04:25:35 GMT

We're looking at a Tektronics (model 5045A?) 100 MHz 4 channel
analog scope that will cost us $2250 (can) or say $3085 (us).
What would fit our bill a little better would be a 4 channel 20
or 30 MHz job.  So...

What is the best (cheapest) scope retailer (ie mail-order) etc,
and what other brands/models should we be looking at?
From: mcorbin@oucsace.cs.ohiou.edu (Max Corbin)
Newsgroups: sci.electronics
Subject: Re: Source of 68HC705K1
Date: 20 Aug 92 18:33:58 GMT
Organization: Ohio University CS Dept,. Athens

In article <18AUG199215052853@rose.uib.no> fafaf@rose.uib.no (FRIHAGEN, ANDERS) writes:
>
>Do anyone have a source of reasonably priced 68HC705K1 OTP's?
>The Norwegian distributor has none in stock and will not get any from 
>Motorola for more than a month... 
>
>Please mail me, as our News discards things really fast!
>
>Anders Frihagen
>Norwegian Computing Centre for the Humanities
>University of Bergen, Norway
>FAFAF@rose.uib.no

Anyone even know where to get the 68HC705K1 OTP's?
(As in someone that has them in stock)
I need a couple very badly.

-- 
+-----+---\ +-----+ 	O O 	Beware the light at the end of the
| | | | -- >|  ---+	 +	tunnel.  It may be an oncoming Dragon.
+-+-+-+---/ +-----+     \_/
   M   	 D     C	 U      mcorbin@oucsace.cs.ohiou.edu
Newsgroups: sci.electronics
From: Josef Moellers <mollers.pad@sni.de>
Subject: Re: How does RAM on fast (10+ MIPS) machines work?
Date: Thu, 13 Aug 1992 07:08:05 GMT
Organization: Siemens Nixdorf Info.Sys. AG, Paderborn, Germany

In <1992Aug12.134629.290@csc.canterbury.ac.nz> geoffrey@cosc.canterbury.ac.nz (Geoff Thomas) writes:

>I'm wanting to build up a computer based on some fast RISC type processor,
>but I'm not sure how to incorporate memory chips into the machine. As far
>as I can tell, most common DRAM chips are too slow, and I preferably don't
>want to waste processor time on wait states, so how can I get nice 32/64-bit
>memory that works with a >10MIPS processor (ideally >100MIPS, such as the
>i860 or DEC Alpha processors)?

Throw in a nice little cache!
-- 
| Josef Moellers		| c/o Siemens Nixdorf Informationssysteme AG  |
|  USA: mollers.pad@sni-usa.com	| Abt. STO-XS 113	   | Riemekestrasse   |
| !USA: mollers.pad@sni.de	| Phone: (+49) 5251 835124 | D-4790 Paderborn |
From: hopper@cs.ucsd.edu (Steve Hopper)
Newsgroups: sci.electronics
Subject: Re: Electric Blankets and Sterility
Keywords: Electric Blankets Sterility
Date: 20 Aug 92 04:06:30 GMT

kolstad@cae.wisc.edu (Joel Kolstad) writes:

>Ok, perhaps I should have said, "you'd be hard pressed to even measure the
>extra field not caused by the background EM..."  In others words, I meant that
>simply having the blanket plugged into the wall socket creates only a slightly
>larger "antenna" that slightly perturbs the local EM field.  The overall
>effect, though, will be to create an EM field that I'd hope you'd agree is
>negligibly different from the one that existed before I plugged the electric
>blanket in, no?  (Assuming a short cord... i.e., that the still connected
>neutral line adds a small length to the overall "antenna" of the entire
>household wiring)  (And when I say "negligibly different" above, I mean in
>terms of average magnitude that's hitting people, and therefore health effects)

About two years ago I built 8 EMG (Electromyographic) devices for my wife's
dissertation.  Basically, the subjects would attact electrodes to their 
jaw and whenever they would clench their teeth throughout the night, the
emg units would record the amount of this activity.  (The muscles emit
electric potentials when active.

We noticed when an electric blanket was used OR plugged in, the EMG units
would accumulate rapidly.  Only when the blankets were unplugged would 
the units not record any activity (when the subject was laying still &
not using the facial muscles).  We had to instruct the subjects to unplug
their electric blankets while they participated in the study.

We definately leave ours unplugged!


Steve
From: mkl@nisc.sri.com (Mark Lottor)
Newsgroups: sci.electronics
Subject: OTP 80C51s?
Date: 18 Aug 92 04:42:13 GMT
Organization: SRI International, Network Information Systems Center
Originator: mkl@zep

Maybe I'm confused here.  I want to use 80C51's in a new project, but
I need all the I/O lines.  The 87C51 EPROM part is very expensive for
small productions runs.  Doesn't someone make an OTP version of the
80C51 that is cheap, like $10-15?  If so, who, and where can I get them?

thanks,
-mkl
Newsgroups: sci.electronics,sci.materials,sci.research,comp.lsi,can.vlsi
From: sankey@unixg.ubc.ca (Todd Sankey)
Subject: Current research in chip fabrication technology
Originator: sankey@unixg.ubc.ca
Organization: University of British Columbia, Vancouver, B.C., Canada
Date: Thu, 20 Aug 1992 00:41:10 GMT

  I am trying to prepare a presentation on the current state of research
in chip fabrication. I am requesting any sort of information from
researchers/students/engineers/anyone in the know.

  Full credit will be given to all contributors. I am asking for
any information available: a title, a short/long summary or even
a ful paper if one is handy. I can handle most any kind of
document from plain text to postscript or TeX.

  Please respond by E-mail to sankey@unixg.ubc.ca and thanks.

		Todd Sankey
		sankey@unixg.ubc.ca

Newsgroups: sci.electronics