HDTenEightyP/NetNews huggingface dataset:
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Static Column vs. Nibble Mode DRAM?
Date: Wed, 16 Dec 1992 18:20:04 GMT
Organization: U of Toronto Zoology

In article <60570032@hpcuhe.cup.hp.com> ken@hpcuhe.cup.hp.com (Kenneth M. Sumrall) writes:
>What is the difference between "Static Column DRAM", "Nibble Mode DRAM", and
>"Fast Page Mode" DRAM?

Internally, a DRAM is a matrix -- usually square -- of cells, and a read
operation internally reads out an entire row.  Folks noticed that it was
kind of wasteful to read an entire row out and then supply only one bit
to the outside world.  Of course, if you're reading bits at random, there
isn't much that can be done about it.  But if you're reading them in
sequence, getting the next bit out of an already-read row is a lot
quicker than reading a new row.  Several ways of exploiting this were
invented.

In a static-column DRAM, once the row read has been done, you're looking
at something that behaves much like a static RAM:  change the address
lines, and after a specified access time, that bit shows on the output.

In a page-mode DRAM, you have to clock the new column address in with
one of the control signals to make things happen.  Fast page mode is
just page mode implemented well; early page-mode implementations often
were rather slow.

In a nibble-mode DRAM, you feed the first column address in by the usual
method, and then after that, just wiggle one control line and it increments
automatically.  Usually there's only a two-bit counter, so you can get a
maximum of four bits out this way, hence "nibble mode".

>Also, what is "Write Per Bit", and why do I want it?

DRAMs whose outside-world interface is wider than one bit have only one
set of control signals for all N (usually N=4) bits.  For many purposes,
this is fine because you read/write all N bits at once.  There are a
few applications that really want finer control.  Consider a 32-bit-wide
memory implemented with 4-bit-wide DRAMs.  Okay, that's 8 chips.  Now add
one parity bit per byte.  That's 4 bits, one more chip... except that if
the system does byte writes into the memory, you need to be able to change
one of those parity bits without changing the others.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics
From: rich@pencil.cs.missouri.edu (Rich Winkel)
Subject: Re: Best nicads??
Keywords: nicad
Organization: University of Missouri
Date: 12 Dec 92 08:38:57 GMT

In <1992Dec10.083347.10926@hemlock.cray.com> n3022@cray.com (Jim Knoll) writes:
>Can someone tell me if there is a possible FAQ that rates the
>different manufacturers of nicad batteries according to quality,
>power output, etc.?

Consumer Reports ran an article on batteries about a year ago, I think
it was nov 91.  They tested standard, alkaline and nicad batteries.
I seem to recall radio shack (gasp) had among the best nicads, especially
in the D size, which were something like twice the capacity of all other
D sized nicads.  The reason is that other brands' D nicads were actually
C sized nicads camouflaged in D cases.
Well worth reading.

Rich
Newsgroups: sci.electronics
From: cmwolf@mtu.edu (christopher m. wolf)
Subject: Re: What newsgroup is this?
Organization: Michigan Technological University
Date: Wed, 16 Dec 1992 05:44:19 GMT

wes@ian.stx.com (John S.) writes:
>I thought I was looking at sci.engr, but I must be mistaken. I just
>went through several articles about stereotypes and net advertising.
>Out of about thirty articles, there were maybe two or three that had
>anything to do with engineering. Please take it elsewhere.

I see sci.electronics

Newsgroups: sci.electronics
From: jhwhit01@ulkyvx.louisville.edu
Subject: Re: Where to get 8097/7 microcontrollers
Date: Sat, 12 Dec 1992 11:48:24 GMT
Organization: University of Louisville

In article <Bz5528.4HI@newsserver.technet.sg>, kewta@solomon.technet.sg (Kew Tow Ann) writes:
> Would appreciate if anyone knows of a mail order source for Intel 8096/7
> micrcontroller? 
 
Try JDR Microdevices.  They have the 80C96 and 80C97 listed for 95cents each.
 
JDR Microdevices
2233 Samaritan Drive
San Jose, CA  95124-9922
 
Sales: (800)538-5000
Fax Orders: (800)538-5005
Tech Support: (800)538-5002
Local/Intl: (408)559-1200
Local/Intl Fax: (408)559-0250
BBS: (408)559-0253
 
There is no minimum order, but $5 minimum on shipping.
 
I hope this helps.         Jeff White
Xref: sparky sci.electronics:20992 sci.energy:6205 rec.autos.tech:16822
From: morrison@cs.uiuc.edu (Vance Morrison)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 19:46:12 GMT
Organization: University of Illinois, Dept. of Comp. Sci., Urbana, IL

>=The housing I've proposed is suited to these conditions.  Since we're 
>=encouraging collisions between particles by containing them, much of their
>=kinetic energy will be dissipated in collision-induced fractures of the 
>=flywheel material. Heat is generated in the housing only in irrecoverable
>=deformations of the flywheel materials and the housing itself, not fractures
>=or elastic deformations. Assuming the flywheel is brittle, there will
>=be fractures but not much elastic deformation.

>I'm afraid you've forgotten the law of conservation of energy again.  I ask
>again:  IF THE ENERGY THAT'S BEING DUMPED DOESN'T END UP AS HEAT, WHERE'S IT
>GOING?  HOW'S IT BEING TRANSFERRED OUT OF THE SYSTEM?

You are making two assumptions that may not be justified.  First you assume
that all energy gets dumped as heat.   It is quite possible that this 
energy can be dumped into some sort of chemical energy, (heat of fusion,
vaporization or endothermic reaction).  Granted, I have not given a 
possible scenerio, I merely point out that conservation of energy is NOT
a proof of infeasibility.  

Second, heat by itself is not THAT bad.  I really don't care if the flywheel
compartment is hot enough to melt steel as long as I survive the crash 
unburned.  If the crash was bad enough that I don't survive, does it matter
that much if I get burned too?   The problem with heat is that it can cause
explosions if released too quickly.    Preventing explosions IS a goal
that good engineering has a chance of accomplishing.  Again, I don't offer
solutions, just pointing out that it is not as hopeless as you make it 
out to be.

On the other hand, I could see how solving these problems might be expensive
and that a better overall solution could be found to the EV problem by
not using flywheels as the primary storage device.  

Vance
Newsgroups: sci.electronics
From: wlsmith@valve.heart.rri.uwo.ca (Wayne Smith)
Subject: Source of AC line spike found: Laminar Hood Blower (MOV problem?)
Organization: (this space for rent)
Date: Thu, 17 Dec 1992 02:35:17 GMT

I posted a message a while ago concerning a voltage spike I was seeing
on the neutral line.  Well, we seem to have identified the culprate as
a blower motor.

The motor is controlled (by some means I haven't check out yet), as it
regulates the vacuum in a laminar flow hood.  You set the vacuum that
you want (inside the hood relative to the outside) and the motor and
controller work to achieve that hood vacuum.  I think it's an 8 amp
motor.

I think the company that makes the hood is Laminar.  Anyways, with the
blower turned on, there is a voltage spike on the neutral line that is
6 or 7 volts in amplitude and 10 usec in duration and occurrs twice per
AC cycle.

We also found that plugging in a particular unloaded power bar also
cause a smaller voltage spike. (this power bar is a little unique in
that it shuts down its outlets in the event of power outage and then
it must be manually reset).

The powerbar got me wondering if these MOV (metal oxide varistors) are
to blame.  Do they ring when they experience a potential shift?
Could they be the problem (if they are used in the blower control
circuit) or are they part of the solution?
From: pauls@trsvax.tandy.com
Date: 11 Dec 92 10:33 CST
Newsgroups: sci.electronics
Subject: Re: "Almost Free" Data Sheets/Helps/Hel
Message-ID: <288200046@trsvax>
Nf-ID: #R:dmapub.dma.org:9926:trsvax:288200046:000:240
Nf-From: trsvax.tandy.com!pauls    Dec 11 10:33:00 1992


Well, I really dont want to throw it out to the world, but OK....

Paul Schreiber
200 Taylor ST. #6244
Fort Worth, TX  76102

and I guess while I'm at it...

(817) 878-6567.

There. I'm naked to the world!!! I'm freeeeeeeeeeeeeeeeee.....



Newsgroups: sci.electronics
From: deanr@sco.COM (Dean Reece)
Subject: Re: Hot Tub Controller
Organization: The Santa Cruz Operation, Inc.
Date: Fri, 18 Dec 1992 17:21:41 GMT

nagle@netcom.com (John Nagle) writes:

>more_da@pts4.pts.mot.com (Dan Morera) writes:
>>Greetings and Happy Holidays Netters,
>>I am developing a system to remotely control a hot tub, and I have not
>>previously worked with the large AC voltages needed to do so.
>
>     Given your discussion, I suggest you get a licensed electrician to
>do the job.  You've missed a few key safety issues.
>
>     This is NOT to be taken as a complete list, but first, where you
>have water near power, you're usually required to use a GFCI breaker,
>and for a hot tub, you definitely should.  Second, you need low-water
>and overtemp detectors for the heater to prevent fire should the water
>stop flowing or be absent.  Most hot-tub heaters have these built in,
>but check.  Redundant overtemp switches are common, and may be required.
>
>     Switches where a wet person can reach them require special handling.
>The usual hot tub switch is an air button, a squeeze bulb connected by
>a tube to a pressure switch.  Just putting the controls on the +5 supply isn't
>good enough, because something might short to the low-voltage portion of
>the system.  UL-approved switches for very wet locations exist, but
>are expensive.

Another alternative is to build the controller as a battery operated
unit (use NiCads) with all the logic and switching there.  Then
couple the serial control signal optically to the line powered controller.
My favorite way to do this is using a 1200bps serial line over optic fiber
(Radio Shack sold a $5 kit with 1 detector, 1 LED and 6 feet of jacketed
fiber).  One other way to do it is to build your own (or buy an appropriate
chip set) IR remote interface.  In effect, you would have a remote for the
hot-tub, with a receiver on the wall several feet away.

-Dean Reece (deanr@sco.com)
Newsgroups: sci.electronics
From: bill@pauli.lv-physics.nevada.edu (Bill ODonnell)
Subject: Re: low power PALs
Keywords: PAL GAL
Organization: UNLV Department of Physics
Date: Mon, 14 Dec 92 23:09:04 GMT

     If your input signals are low frequency I have just the
thing.  AMD (Advanced Micro Devices) has the ZPal, Z for zero
power.  When none of the inputs swich for a period of time,
usualy around 50ns, the device goes into its power down mode.
It will remain in this mode until an input transition occures.
While in this mode the outputs are held at the same state as
before the power down.

     While in standby mode the current is <15ua.  As the input
frequency increases so does the current.  The supply voltage can
range from 3.84V to 7V.

          Input freq.(Hz)          Icc(ma)
          ---------------          -------
               1K                  0.09
               10K                 0.3
               100K                1.3
               1M                  15
               10M                 50
                .                   .
                .                   .
                .                   .


                                                Bill o'Donnell
                                                (concerned citizen)



Xref: sparky sci.electronics:21228 sci.energy:6285 rec.autos.tech:16964
From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 20 Dec 1992 22:56:15 GMT
Organization: HST Wide Field/Planetary Camera
Distribution: world
Reply-To: carl@SOL1.GPS.CALTECH.EDU
NNTP-Posting-Host: sol1.gps.caltech.edu

In article <1992Dec17.205631.9731@u.washington.edu>, basiji@stein.u.washington.edu (David Basiji) writes:
=>Again you prattle of "energy loss."  WHERE IS THIS ENERGY BEING "LOST" TO?
=>It doesn't just go away because you find it inconvenient.  And the remnants of
=>the flywheel don't just keep orbiting the place where the shaft used to be.  So
=>where did all the kinetic energy go?
=
=The energy is being used to split the covalent bonds that hold the flywheel
=together. In essence, you're separating charged atomic species and therefore
=converting the kinetic energy of the rotor into potential energy in the
=form of fragmented material.  The idea of the housing is to allow the
=rotor components enough time to interact with each other so that a large
=fraction of the energy goes into rotor destruction rather than housing
=destruction.

My first post in this thread was to point out that you need to enclose the
flywheel in something massive enough that all the energy from the flywheel
can't vaporize it.  You then, expert in biosciences that you are, went off and
started prattling of "energy loss," and still don't seem to have even the
vaguest idea of the amount of energy we're talking about here.
--------------------------------------------------------------------------------
Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL

Disclaimer:  Hey, I understand VAXen and VMS.  That's what I get paid for.  My
understanding of astronomy is purely at the amateur level (or below).  So
unless what I'm saying is directly related to VAX/VMS, don't hold me or my
organization responsible for it.  If it IS related to VAX/VMS, you can try to
hold me responsible for it, but my organization had nothing to do with it.
Xref: sparky sci.electronics:20924 sci.energy:6176 rec.autos.tech:16790
From: csmith@plains.NoDak.edu (Carl Smith)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 05:46:11 GMT
Article-I.D.: ns1.BzE2oz.I4H
Organization: North Dakota Higher Education Computing Network

In article <1goebdINNik@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes:
>
>But enough energy to move that vehicle
>on the order of 100 miles at freeway speeds is still around there someplace. 
>It didn't just vanish.  And that's a LOT of energy.  And it got dumped FAST.
>
>In other words:  BOOM!

I am not going to argue the above point, but consider this.  If you are
going to measure danger by the amount of stored energy, then which is
more dangerous when it explodes?  A flywheel that has enough energy to 
move a car 100 miles at freeway speeds, or a tank of gasoline with enough 
energy to move a car at greater-than-highway speeds for 300 miles?

>Unless you wrap the flywheel in a massive enough container that it can absorb
>all that energy without vaporizing, you're going to have an explosion.

Why bother, we don't wrap our gas tanks in a container that would contain
their explosion?

The point I am trying to make is that flywheels may be dangerous, but driving
around with 20 gallons of gasoline strapped to the bottom of your car in a
thin sheet metal container is A LOT MORE dangerous.  But we consider that 
risk as acceptable considering the convenience that we get from our cars.
So, why the worry about deriving the same convenience from a lesser danger?
Because people are not used to doing it every day...
Newsgroups: sci.electronics
From: acampane@magnus.acs.ohio-state.edu (Angelo Campanella)
Subject: Re: DESPERATE for anti-bark device...
Organization: The Ohio State University
Distribution: sci.electronics
Date: Sun, 13 Dec 1992 08:00:39 GMT

In your particular case, I would suggest you either sweet talk the neighbor to 
turn on his light at dusk, or for you to aim one in the dog's direction in
place of it.  Dogs are very territorial, but they also can be very neurotic.

Be thankful that you have identified his pacifier!
Xref: sparky sci.electronics:20654 rec.audio:16625 alt.guitar:10831 rec.music.makers.guitar:902
From: dam@dcs.glasgow.ac.uk (David Morning)
Newsgroups: sci.electronics,rec.audio,alt.guitar,rec.music.makers.guitar
Subject: Re: Tube amp transformers
Keywords: tubes transformers
Date: 14 Dec 92 11:08:48 GMT
Organization: Glasgow University Computing Science Dept.

rblander@watdragon.uwaterloo.ca (Robyn Landers) writes:

>    Check that the smaller tubes can handle the plate voltage the xformer
>was providing to the larger tubes.  RCA Receiving Tube Manual says
>6L6 can take 360 volts (design centre), or 500 volts (design maximum)
>at the plate.   6BQ5 (EL84) says 300V design centre; it doesn't
>list design max.  

Honourable Tung Sol valve company say Va max 550 volts no plate current for
6BQ5 grasshopper.

Dave

--
From: bailey@fenris.com (Kirk Bailey)
Newsgroups: sci.electronics
Subject: Wanted (1) MC1405L (analog chip from early two chip DVM set)
Date: 16 Dec 92 12:33:04 GMT
Article-I.D.: fenris.1992Dec16.123304.18563
Distribution: usa
Organization: Fenris Information Exchange, Corvallis, Ore.

I'm looking for a source of one of these to fix a broken piece of test
equipment.  I've been told that they became obselete a couple of years ago and
haven't yet found anyone who still has stock...

	Cheers,
		Kirk Bailey, N7CCB
		P.O. Box 1702
		Corvallis, OR 97339
		503-753-4628 (home)
		503-753-9051 (work)
Newsgroups: sci.electronics
From: wa197@sdcc12.ucsd.edu (Dave Mackie)
Newsgroups: sci.electronics
Subject: "dumb" pagers
Date: 14 Dec 92 16:01:30 GMT
Article-I.D.: sdcc12.42537
Organization: University of Confusion

A friend of mine works in a large warehouse which stores thousands
of boxes for long periods of time (between 1 and 5 years).
The firm sometimes misplaces boxes and has to replace the contents -

He asked me to look into the idea of "tagging" each group of boxes
with devices which could be triggered to beep if needed.
(if a box wasn't on the expected shelf you could "page" it and the
beep would help you find it among all the other boxes).  Direction
and range information isn't necessary because the signal is audible.

I thought of a "dumb" pager; no message capability, no vibrator.
Just a simple (loud) beeper in a durable and reusable case.
Have a low power transmitter (after all, it's _inside_ a metal
building - maximum transmit distance 500 meters) page missing boxes
and follow the beep.

Does anyone have pointers to such a system or clues on where to
steer someone interested in building same?

Response summary posted if sufficient interest.

Thanks in advance.

-dave
 dmackie@ucsd.edu
 70641.3141           Compu$erve
Xref: sparky sci.electronics:21196 sci.energy:6279 rec.autos.tech:16943
From: lordSnooty@cup.portal.com (Andrew - Palfreyman)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: Sat, 19 Dec 92 13:44:22 PST
Organization: The Portal System (TM)
  <1992Dec16.192456.6261@news.cs.brandeis.edu>
  <1goebdINNik@gap.caltech.edu> <3204@contex.contex.com>

Frank E Perdicaro writes:
: As an interesting side light, the largest forging ever made is 
: the largest flywheel ever that stores energy at MIT for the 
: ALCATORC-MOD fusion reactor.  It takes like 500 hp all night to spin it up, 
: and 3 seconds to stop when the switch is flipped.  
: 
: Yeah, megajoules, many of them.  If there was a quake when the thing
: was spinning, it would remove a large section of Cambridge.  
: 
: Its surface speed is just below the speed of sound, and it weighs like
: a very large steam locomotive ; and its right next to the FISSION
: reactor..... they know there is no way to stop it if there is a quake,
: so its just in a simple flimsy building.

I have a problem with this; if v^2 ~= 1e5 (m/s)^2 and you've pumped in
about 3MJ, the mass must be about 60Kg for a disc shape. Perhaps the speed
is not nearly so high - this is hardly a locomotive weight!
(Hint: use Disc Energy = 0.5m(r*w)^2 and 1hp = 764W).

Andrew Palfreyman
From: hubey@pilot.njin.net (Hubey)
Newsgroups: sci.electronics
Subject: Toggle FF (Switch)
Date: 14 Dec 92 23:42:17 GMT
Organization: Rutgers Univ., New Brunswick, N.J.




I need a toggle-flip-flop that works at 9V so that I can
use it in conjunction with a momentary-contact switch to
turn my alarm system on and off.

I've looked at electronics stores but couldn't find anything
like it. Does anyone know of a place where I can find such
a switch?

Thanks. Email is appreciated since I rarely read this group.
-- 

	mark	


   hubey@pilot.njin.net                   hubey@apollo.montclair.edu
 ...!rutgers!pilot!hubey                  hubey@logos.montclair.edu
Newsgroups: sci.electronics
From: parnass@cbnewse.cb.att.com (Bob Parnass, AJ9S)
Subject: Re: Best nicads??
Organization: AT&T Bell Laboratories, Naperville, IL
Distribution: usa
Date: Tue, 15 Dec 1992 14:28:31 GMT
Summary: I don't believe Radio Shack catalog NiCd specs. Here's why.

In article <13635@optilink.COM>, walsh@optilink.COM (Mark Walsh) writes
about NiCd batteries:
 
   > ......From the 1993 Radio Shack catalog:
   > 
   > Size      Amp hours
   > ----------------------
   > D         1.250
   > C         1.250
   > 9V        0.065
   > AA        0.650
   > AAA       0.180
   > N         0.150


I don't believe it.  Radio Shack's 1989 catalog claims
a capacity of 0.45 Amp hours for the same AA NiCds (#23-125) !!!
The purple #23-125 NiCds they sell today appear identical to the
purple #23-125 NiCds I bought from them several years ago.

They both have the same charging information: 45 ma for
14 - 16 hours.  I'd expect to have to charge a real 650 mAH
NiCd at 65 ma for the same period.
-- 
==============================================================================
Bob Parnass, AJ9S  -  AT&T Bell Labs  -  parnass@ihlpm.att.com - (708)979-5414
Newsgroups: sci.electronics
From: george@ve7frg.ampr.org (George Farris)
Subject: Re: PCB fabrivcation  {sic}   (disposal of wastes)
Organization: G.M. Systems
Date: Mon, 14 Dec 1992 17:33:35 GMT
X-Newsreader: TIN [version 1.1 PL6]


I suggest you check with your local municipality, many of them are now
offering waste sites where one can go and dispose of toxic material,
batteries etc.  Ours here in Victoria, BC is open twice per month.

-- 

==========================================================================
George Farris - VE7FRG          Internet  :  george@ve7frg.ampr.org
                                 Amprnet  :  george@ve7frg.ampr.org
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: IR serial links
Date: 17 Dec 92 06:40:35 GMT
X-Maildoor: WaflineMail 1.00r

I have been considering the construction of a bidirection Infared
Serial link.  (I know Circuit Cellar Ink has a construction
article on something similiar).  SO here are some "stupid"
questions.  BAUD rate recognition.  Is it possible to transmit
the baud rate clock with the data?  Or does one have to use the
ephemerial carrier etc technique?

I would like a bidirectional tramission rate of at least 31.25k
bps (MIDI).  Though I hope to use it for more than that.

IDEAS?

                Stephen Cyberman@Toz.Buffalo.NY.US
             Mangled on Wed  12-16-1992  at 19:53:49
---
 * Blue Wave/QWK v2.11 *
From: spedding_n@kosmos.wcc.govt.nz
Newsgroups: sci.electronics
Subject: PLESSY ZN459CP pinout required
Date: 18 Dec 92 09:31:46 NZST
Organization: Welligton City Council, Public Access.
NNTP-Posting-Host: kosmos.wcc.govt.nz

I urgently require the pinout for a PLESSY ZN459CP video amp
thanks in advance
Bruce
Newsgroups: sci.electronics