HDTenEightyP/NetNews huggingface dataset:
From: jeffj@krfiny.uucp (J. Jonas)
Subject: Re: stand alone UART ??
Organization: Jeff's house of computer pieces
Date: Wed, 23 Dec 1992 22:51:06 GMT

>> Does anyone know of a current part like the old Western Digital
>> TR1863/1865. It is a stand alone UART, i.e. pin programmable
>> with separate physical recieve and transmit sections.
>> The 1863 appears in the 1984 Data book but WD now only make all
>> singing/all dancing ones that require a microprocessor to talk
>> to them (load registers etc).

a) The General Instrument AY-3-1015 or similar are identical.
Same pinout if I recall properly ...
The newer models had higher speeds (old ones topped off at 9600).

b) I have 4: Western Digital PR1472-B
and 4: Western Digital PR1482-B.  They're older UARTs I pulled
from sockets from some terminal server.
How about $5 the lot, shipping included
(you realize that the shipping will dominate the cost).

- Jeffrey Jonas
jeffj@panix.com
-- 
Jeffrey Jonas

jeffj@panix.com
From: Graeme.Chester@newcastle.ac.uk (E.G. Chester)
Newsgroups: sci.electronics
Subject: Re: "The Glob" Atari 2600 processors ???
Date: 21 Dec 92 10:08:29 GMT
Organization: University of Newcastle upon Tyne, UK NE1 7RU

In article <kennehra.724560313@craft.camp.clarkson.edu> ,
kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:
>
>Hi.  I opened up one of my atari 2600 games, and instead of a regular
>chip inside, there was this small plastic glob where the ROM chip    
>should be!!!!   what is this?                                    

I think you will find that the chip is bonded directly to the PC board,
and is not packaged in a DIL pack with pins. The PCB tracks are then bonded 
to the chip with very thin wires (like those used to bond the chip to the
package in a DIL packaged device) and the whole thing is protected by a
glob of epoxy to keep out contaminants, fingers etc. This method is often
used in cheap calculators, watches etc. to save space and money.

Graeme Chester
Obsessive dismantler of gizmos
Newsgroups: sci.electronics
Subject: 68hc11 Sources?
From: <DI3QC@CUNYVM.BITNET>
Date: Tuesday, 29 Dec 1992 00:04:26 EST
Organization: City University of New York/ University Computer Center

     Could someone please direct me to a source where I can purchase several
68hc711E9fs. I havent seen any sources for the windowed eprom version. Any
help would be great. If you could please respond: jeannopo@alehouse.acc.qc.edu

Because my account is going down. Thanks.
                                             Alex Jeannopoulos
Newsgroups: sci.electronics
From: george@epsilon.ee.ufl.edu (George L)
Subject: Re: Magnetic Sensor?
Organization: EE Dept at UF
Date: Sun, 3 Jan 93 08:04:02 GMT

In article <1993Jan2.104609.4196@arizona.edu> dparker@ece.arizona.edu (Douglas R. Parker) writes:
>
>subsequent devouring of many a tape was a perpetual End of
>Tape being recieved. I tried using similar salvage parts to
>replace the gear but this didn't work. The reason for this,
>I think, is that the original gear had a small disk magnet
>fixed to its base, and beneath it was a small surface mount
>component. I assume this is some sort of a tape speed
>regulation. My question? The matter is rather academic at this
>
Most likely, it was a Hall-effect device used to sense end-of-tape. When you 
reach an end-of-tape situation (in play, rewind, or Fast-forward), the hub is 
stopped by the tape-tension, the magnet no longer passes by the device, and 
the periodic signal ceases to be induced. 

This signal is also used for the digital tape-counter (if your deck has one). 
Some decks use an optical device and a wheel with reflective patterns.

Hope this helps (or is even correct),
George Larson             |
george@alpha.ee.ufl.edu   |           "Remember, we're all in this together!"
University of Florida     |             -Harry Tuttle ("Brazil")
From: pjs@gvgdsd.GVG.TEK.COM (Peter J. Stonard)
Newsgroups: sci.electronics
Subject: True electronic ballasts
Date: 25 Dec 92 18:49:42 GMT
Organization: Grass Valley Group, Grass Valley, CA
NNTP-Posting-Host: gvgdsd.gvg.tek.com
Originator: pjs@gvgdsd

I have a question or two that is more appropriate for this group 
than the *.aquaria groups where this thread comes up from time to time.

Our background is keeping fish as a hobby and one of the factors
that can be varied is the type of lighting used over aquariums. In
the hobby trade there are simple incadescent bulb hoods sold for
low cost, fluorescent versions that allow a wide selection of lighting,
and finally exotic lamps called Metal Hallide. Some of us build
our own and experiment with various bulb combinations and control gear.

On the subject of fluorescent lights there are convientional
inductor ballasts or ballast/transformers used for trigger-start 
and rapid-start systems, respectively. There are also 'electronic'
or solid-state ballasts. 

(1)	How do truely solid-state electronic 'ballasts' operate?

(2)	What is their advantage over the simple iron cored coil?

(3)	Is there more than one scheme? 
The electronic one that I dismantled was in a cheap shop light 
(2 x 40W 4ft bulbs), but it had a smallish coil in series with a 
largish capacitor. (Sorry didn't have an LCR meter handy and both were 
un marked). The starter was a typical thermal glow switch, but 
instead of a cylindrical cannister it was moulded plastic, and not 
meant to be replaced.

(4)	Are there application notes, schematics, ready made modules or 
electronic ballast replacements, available?

Thanks in advance.

++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++
Peter J. Stonard        +                                /^\  /^\
Grass Valley Group      +                       /^\     /   \/
Grass Valley, CA. 95945 +                     /     \ /    /  
pjs@gvgspd.gvg.tek.com  +     Fish keeper in the Sierra Foothills
++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++=++
If it looks like; sounds like; quacks like; an Opinion. It's mine.
Newsgroups: sci.electronics
From: dmturne@ptsfa.PacBell.COM (Dave Turner)
Subject: Re: need some basic help with DIODES
Reply-To: dmturne@PacBell.COM (Dave Turner)
Organization: Pacific * Bell, San Ramon, CA
Date: Thu, 31 Dec 1992 09:52:15 GMT

In article <1ht4krINN9kb@post.its.mcw.edu> kcb@post.its.mcw.edu (Kent C. Brodie) writes:
>
>A simple question.    Which way does the "band" on a diode go?  +/-?
>

The "band" indicates the cathode.

To forward bias a diode, connected a negative voltage wrt the anode.
(negative to the "band", positive to the other end.)

If you are using a diode as a rectifier (as in a power supply) the "band"
end will be the positive supply output.

Very old diodes and selenium rectifiers sometimes put a + on the cathode
to indicate the positive supply output. I have a few of these in my
collection to show the disbelievers.



-- 
Dave Turner	(510) 823-2001	{att,bellcore,sun,ames,decwrl}!pacbell!dmturne
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: jgd@dixie.com (John De Armond)
Subject: Re: Flywheel batteries as EV power source
Date: Wed, 23 Dec 92 04:39:53 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.

carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:

>Sorry, but you apparently missed a post early in this thread where the
>designers of one of these flywheels were quoted as saying that in a
>catastrophic failure, the flywheel WOULD disintegrate.  They described the
>flywheel after disintegration as "fluff."  This bit of disingenuousness was
>apparently meant to make the flywheel seem safe.  After all, "fluff" couldn't
>possibly be dangerous, could it?


yup.  I have a little demo of the power of "fluff" I occasionally do
when I have visitors in the lab.  I take a .308 NATO brass, load
it almost to the bottleneck with 2400 powder (a fast pistol powder) and
plug the top of the case with a wad of ordinary kitchen paper towel.
I load the whole assembly in my silhouette pistol and fire it 
at a piece of 1" plywood from a distance of about 3 inches.  The bit 
of paper towel "fluff", exiting the barrel at a velocity of about 4000 feet
per second, easily penetrates the inch of wood.  When fired at a distance of 
over about a foot, the air drag (not to mention that it is spinning at about
240,000 RPM from the rifling twist) has so disintegrated the "fluff" that it 
does not even imprint the wood.  In the context of this flywheel discussion, 
of course, the "fluff" would travel in a vacuum until it hit something and 
so would NOT be disrupted.

John
-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine(TM) | Interested in high tech and computers? 
Marietta, Ga                         | Send ur snail-mail address to 
jgd@dixie.com                        | perform@dixie.com for a free sample mag
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.
Newsgroups: sci.electronics,comp.sys.laptops
From: phr@telebit.com (Paul Rubin)
Subject: Duracell advertising NiMH batteries
Organization: Telebit Corporation; Sunnyvale, CA, USA
Date: 22 Dec 92 23:05:58

The current BYTE magazine has a big ad from Duracell advertising
NiMH battery packs, allegedly soon to be available at retail outlets
everywhere.  They look in the photos like snap-in packs for
notebook computers.  I don't have the text handy but there
was no indication that loose cells would be availble.
I plan to phone them when I get a chance and try to get more info.
Newsgroups: sci.electronics,sci.energy,rec.autos
From: bbarkey@lark.utah.edu (Brian Barkey)
Subject: Re: Flywheel batteries as EV power source
Organization: University of Utah
Date: Wed, 23 Dec 92 15:40:10 GMT

In article <78580@ncratl.AtlantaGA.NCR.COM> mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson) writes:
>In <1992Dec22.214616.27043@fcom.cc.utah.edu> bbarkey@lark.utah.edu (Brian Barkey) writes:
>
>|	And gasoline isn't explosive? 
>|	I may be mistaken but any power source capable of propelling
>|	a ton or more at speeds greater than 50 mph for hundreds of 
>|	miles must have a significant amount of energy in it. 
>
>It doesn't sound like you have been listening either.  In the event of
>a catastrophic failure, gasoline burns, it does not explode.  The energy
>contained in the tank is released over a period of 15 to 20 minutes.
>
>The flywheel will try to dissipate it's energy over a span of milliseconds.
>
I guess I missed the part about dissipating energy over ms. What's the 
basis for this?
Also, sometimes in accidents the gasoline does mix sufficently well
with the air to be a hazard (remember the Pinto?) I'm certain that
in a flywheel powered car there wil be accidents that will be explosive
and many that are not. Isn't this a factor of the design? If the 
flywheel power source is a viable and marketable option I'm certain
that manufacturers in lawsuit happy countries like this would 
make a couple of prototypes and run 'em into walls to see what happens.
This technology is relatively new, gasoline powered cars have been 
around for a century or so and there are still problems. 
Maybe the flywheel isn't safe. Could it be used in a smaller capacity 
to augment accelerations from braking energy? All of this discussion is
conjecture, but aren't ideas wonderful to ponder?
		Brian Barkey
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: How would you detect lack of a square wave?
Date: 3 Jan 1993 23:21:42 GMT
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <1993Jan2.172332.21070@socrates.umd.edu> jimbo@socrates.umd.edu (Jim Bogard) writes:
>What's the best way to detect the presence/lack of a square wave?

	One way is to use a 'missing pulse detector' with
a one-shot (which has already been mentioned).  Another,
more common in cheap consumer gear, is to use a transistor
and rectify the AC...

                                +5V
                                 |
                                 R
                                 |
                          +------+--------output
                          |      |
                          =     /
                          |    |
in+-------||---+---|>|----+----|
               |               |
               -                \
               ^                 |
               -                 |
               |                 |
              GND               GND


	The input capacitor pumps charge through the
two diodes to turn the transistor ON, and the collector-to-base
capacitor keeps the transistor from turning OFF quickly
(until the next pulse comes in).  It is even possible to
omit the diodes in some circumstances.  The input and output 
voltages needn't be limited to logic levels, either.

	John Whitmore
Newsgroups: sci.electronics
Subject: Re: XMAS Lights Theft Alarm
From: delinck@pa621a.inland.com
Date: 21 Dec 92 11:04:16 CDT
Organization: Inland Steel Company, East Chicago, IN
Nntp-Posting-User: delinck

In article <1992Dec10.182447.16893@vpnet.chi.il.us>, cgordon@vpnet.chi.il.us (gordon hlavenka) writes:
>>>... The device would work by detecting the AC current being
>>>consumed by the lights, then triggering an alarm if it drops below a certain
>>>point.
>  toddi@mav.com (Todd Inch) writes:
>>This will be very nearly impossible with ...
> 
> But you don't need to look at a steady-state current, just a sudden
> change.  This should be pretty simple to spot.
> 
What if he's using blinkers?
(No replies or followups, please. This is a dumb enough comment w/o more
stupidity)
> Gordon S. Hlavenka           cgordon@vpnet.chi.il.us
Jeff Delinck   delinck@pa621a.inland.com
From: wrb@cbnews.cb.att.com (wallace.r.blackburn)
Newsgroups: sci.electronics
Subject: Re: DOES AMERICA SAY YES TO JAPAN? - Off track!!
Date: 22 Dec 92 15:54:42 GMT
Distribution: usa
Organization: AT&T

In article <louis.724990947@aupair.cs.athabascau.ca> louis@aupair.cs.athabascau.ca (Louis Schmittroth) writes:
>fester@island.COM (Mike Fester) writes:
>
>
>>Strange, is it not, then, that our GNP is STILL double Japan's? Strange, also,
>>that American companies ignored the competition for decades. Again, you might
>>read Peter Drucker. He DID warn (in the 50's!) that America would be in
>>trouble in the 70's, due to lack of capital investment. He also details how
>>large US manufacturers ignored foreign challengers, tried to 'cream' the 
>>markets (ie, only selling "top-of-the-line", and leaving mass-consumer goods
>>to those 'foreigners'), and basically frittered away much of our leadership.
>
>>AFTER you have read Drucker, you will be better equipped to take up the debate
>>with some INTELLIGENT criticisms.
>
>No, I have not read Drucker, at least on Japan, but I have read both
>Prestowitz,"Trading Places," and Lester Thurow, "Head to Head."  And
>yes American companies did make mistakes in hindsight.  AT&T *never*
>should have given, or sold, the rights to the transistor to Sony.

AT&T didn't have any choice in the matter.  Part of the price to be paid
for being a "regulated monopoly" was that AT&T had to license technology
such as the transistor for very low prices  (I believe a license for
transistor technology was $15000).  This was because AT&T, in effect, used
public money to develop the technology.  They were not at risk for
profit/loss - they could recover any investment by adjusting phone rates.

Please note that I am not knocking this system at all.  It provided much,
much useful work that probably couldn't/wouldn't have been done anywhere
else - transistor, LASER, artificial larynx, etc.  In my biased opinion,
the Bell System should have been left alone.  The Justice Department (yeah,
right) simply had a grudge because they could not control AT&T.

While not perfect, the old Bell System was filled from top to bottom with
people that truly cared about their customers, company, and country.  Even
though there was great power to be wielded it was rarely, if ever, abused
for the sake of profit or personal gain.  These people were sincere when 
they said their first concern was that when John Doe picked up the phone to
call mom, the thing worked and he got through.

Kennedy (the old man - not John), foresaw the time when the real power
would be contained in the government instead of business.  Well, that time
is here and ain't they doin' a wonderful job?  (What's the biggest lie ever
told:  I'm from the government and I'm here to help you.)

As a side note:  Did anyone see when Al (Ken doll) Gore tried to cow Bob
Allen (AT&T chariman) when he asked if Allen really meant to disagree with
him?  Gore's contention was that the nation should be covered with a fiber 
optic network installed by the government instead of the private sector.

Oh my yes, they do such a wonderful job with every other project they manage.

My opinions only.
From: miller@hmsp04.wg3.waii.com (Griff Miller X7114)
Newsgroups: sci.electronics
Subject: Re: DOES AMERICA SAY YES TO JAPAN? - Off track!!
Date: 22 Dec 92 15:36:37 GMT
Organization: Western Geo. - Div of Western Atlas Intn'l Inc., Houston, TX

In article <1992Dec21.195341.4921@island.COM> fester@island.COM (Mike Fester) writes:
>In article <BzExLy.7IH@news.cso.uiuc.edu> irvine@uxh.cso.uiuc.edu (Brent Irvine) writes:

>>Yeah, its the tactic for churning volume in a saturated market.

>This is a bad thing?

I think so. It's wasteful. The consumer, manufacturer, and society in
general lose in the long term.
--
Griff Miller > miller@monarch.wg3.waii.com < use this for email.

          *** My opinions are mine, not Western's. ***

   "The fear of the Lord is the beginning of knowledge, but 
    fools despise wisdom and discipline."   - Proverbs 1:7 
Newsgroups: sci.electronics
From: apollo@r-node.gts.org (Andrew Herdman)
Subject: MC68HC11 Eprom's
Organization: R-node Public Access UNIX Information System (416-249-5366)
Date: Wed, 23 Dec 1992 04:32:12 GMT

I've been reading the MC68HC11A8 Technical Data and MC68HC11 Reference
Manual, and can't seem to find how to program the Internal Eprom in the
7xx series.  They go to great details on how to program the EEPROM, but
completely skip the EPROM.  I know some can be programed with a
programmer board but I'm looking for a way to d/l a program into
internal ram from the serial port, and then have my program program the
EPROM.  Any Ideas?  It's not the same as the EEPROM is it?

Andrew

-- 
#############################################################################
apollo@r-node.gts.org - no email exceeding 15k each and 30k daily

apollo@r-node.pci.on.ca  - faster route, but above applies
Newsgroups: sci.electronics
From: park@umnstat.stat.umn.edu (Chongsun Park)
Subject: Help in charging NiCad battery pack
Organization: School of Statistics, University of Minnesota
Date: Sat, 26 Dec 1992 22:52:39 GMT

Hello, netters.

I have some questions in charging my NiCad battery pack. I am very sorry
if this is not the right news group to post.                        

I have a 7.2V, 700mAh NiCad battery pack. Also, I have a charger(DC out
10V, 1.3A) for different NiCad(6V, 1000mAh). 

Can I use this charger for 7.2V, 700mAh NiCad?
If the answer is yes, then can I use charge indicator(on when fully charged)
to check that the battery(7.2V one) is fully charged?

Thanks in advance.

Chongsun

------------------------------------------------------------------------------
Chongsun Park          H: 612-331-7022   Internet:park@stat.umn.edu
1018 27TH AVE SE #B    O: 612-625-5247            stat261@staff.tc.umn.edu
MPLS, MN55414             612-625-3121            HL1ABT HL1AWG KB0FME
------------------------------------------------------------------------------
Newsgroups: sci.electronics
From: smjeff@lerc05.lerc.nasa.gov (Jeff Miller)
Subject: Re: help - tv remote
Organization: NASA Lewis Research Center, Cleveland Ohio
Distribution: sci
Date: Wed, 30 Dec 1992 18:10:39 GMT

In article <1992Dec30.160937.16326@phx.mcd.mot.com> schuch@phx.mcd.mot.com (John Schuch) writes:
>In article <1992Dec29.4265.27307@dosgate> "glen mead" <glen.mead@canrem.com> writes:
>>Recently I learned that a friends mother suffers from Hodgkins (sp?)
>>disease.  As a result, her motor control has become very poor and she is
>>having alot of trouble changing channels on her tv set.  The problem is
>>that her remote control (supplied by the cable company) only gives the
>>user a certain amount of time to press the required numbers to change the
>>.....
>>small wired remote which would give her three large buttons (one for each
>>channel) to work with.  Any help would be greatly appreciated.
>
>I guess the simplest, but most expensive solution would be to use three
>cable converters and switch between them.
>
>The least expensive, and least convienient solution would be to get a
>remote which has channel up/down buttons and remote these to large
>buttons. It might, however, take her an excessive amount of time to
>step from say channel 4 to channel 36.
>
[stuff deleted]
My VCR (Mitsubishi) lets me skip channels that I don't want to see when
I use the channel up and channel down buttons.  This feature might
be available on other VCRs also.
-- 
Jeffrey H. Miller     smjeff@lerc05.lerc.nasa.gov
Sverdrup Technology, NASA Lewis Research Center Group, Cleveland, Ohio

favorite book title: Attack of the Deranged Mutant Killer Monster Snow Goons

Newsgroups: sci.electronics
From: mitch@clsi.COM (Mitchell N. Perilstein)
Subject: ATT 3b2 console pinouts ... please?
Organization: CAD Language Systems, Inc.
Distribution: sci
Date: 3 Jan 93 16:40:10

I've asked in comp.sys.att, but they're silent.

The 3b2 serial console connector is like an RJ11, but with more
conductors.  It carries something like RS232, because I've stumbled a
working arrangement before.  I'm less clumsy than usual: I can't get it
this time.

Does anyone know what the signals are?

TIA,
---
 Mitchell N. Perilstein   CAD Language Systems, Inc.   410-992-5700 x225 
 Member, League for Programming Freedom.  Mail lpf@uunet.uu.net for info.
Newsgroups: sci.electronics
Subject: Magnetic Sensor?
From: dparker@ece.arizona.edu (Douglas R. Parker)
Date: 2 Jan 93 10:46:09 MST
Distribution: world,local
Organization: U of Arizona Electrical and Computer Engineering

Greetings.

Quite a while back I attempted to repair the tape deck
in my Toyota. I found that one of the plastic shafts that
rotates the casette's tape wheel had cracked, leaving a gap
in the gear teeth. I assume the reason for malfunction and
subsequent devouring of many a tape was a perpetual End of
Tape being recieved. I tried using similar salvage parts to
replace the gear but this didn't work. The reason for this,
I think, is that the original gear had a small disk magnet
fixed to its base, and beneath it was a small surface mount
component. I assume this is some sort of a tape speed
regulation. My question? The matter is rather academic at this
point, as this was a good excuse to buy a CD unit. However,
I am still very curious as to how the thing worked. Although
my EMAG is rusty, I would guess that a rotating B field was
somehow used to induce current in this sensor, which was
then used as a feedback. Does anyone out there have experience
with this type of arrangement?
Just extremely curious,

dparker@helios.ece.arizona.edu

 
Newsgroups: sci.electronics
From: george@ve7frg.ampr.org (George Farris)
Subject: How can I align a cassette tape head?
Organization: G.M. Systems
Date: Sun, 3 Jan 1993 19:34:29 GMT
X-Newsreader: TIN [version 1.1 PL6]


Is there any alignment tapes available that one can view with a scope an
align the tape heads?  How is this done these days?

-- 

==========================================================================
George Farris - VE7FRG          Internet  :  george@ve7frg.ampr.org
                                 Amprnet  :  george@ve7frg.ampr.org
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