HDTenEightyP/NetNews huggingface dataset:
From: ee176fah@sdcc15.ucsd.edu (Pan Chou)
Newsgroups: us.forsale.computers,sdnet.wanted,misc.forsale.computers.mac
Subject: MAC SE FORSALE: $575 OR BEST OFFER
Date: 23 Jan 93 11:56:25 GMT
Followup-To: us.forsale.computers
Distribution: usa
Organization: University of California, San Diego


FOR SALE:
	
	MACINTOSH  SE: $575/OR BEST OFFER
		4MB RAM
		20MB EXT. HD
		2-800K FLOPPIES
		KEYBOARD/MOUSE
		

	IT IS A NICE BASIC MAC. ALL IN EXCELLENT CONDITION. IF
INTERESTED OR HAVE MORE QUESTION, PLESE CONTACT PAN AT: 

ee158waf@sdcc15.ucsd.edu

THANKS.
From: jrd@jhunix.hcf.jhu.edu (Jean-Richar Desarmes)
Newsgroups: us.forsale.computers
Subject: 4 1-Meg SIMMS for sale
Date: 26 Jan 1993 23:17:37 -0500
Organization: Homewood Academic Computing, Johns Hopkins University, Baltimore, Md, USA
NNTP-Posting-Host: jhunix.hcf.jhu.edu


Hello people,
I have 4 1-Meg (80ns) 1x8x80 SIMMS chips.  Price is $150 for all four
(NEG).  E-mail starion@jhuvms.hcf.jhu.edu.  Leave phone number.
From: antonio@arezzo.oas.olivetti.com (Antonio Maiuolo)
Newsgroups: us.forsale.d
Subject: **** FLOTATION WATER BED for sale ****
Keywords: flotation, water, bed
Date: 28 Jan 93 21:09:36 GMT
Reply-To: antonio@arezzo.oas.olivetti.com (Antonio Maiuolo)
Organization: Olivetti Research California



    *********************************
    *                               *
    *         FOR SALE !!!!         *
    *                               *
    *      FLOTATION WATER BED      *
    *                               *
    *********************************

    - EXCELLENT CONDITION
    - $ 125
    - call Richard or Judy: (408)978-0293

Newsgroups: nyc.general
From: fj@SHIRE.MATH.COLUMBIA.EDU (Fred Johnson)
Subject: Columbia Seminars Week of January 25
Organization: New York University
Date: Sat, 23 Jan 1993 05:25:03 GMT

             
                     Columbia University
                  Department of Mathematics


Seminars                      Week of January 25, 1993


                    FRIDAY, JANUARY 29

Geometric Topology: (J. Birman) T.S. Fung (Columbia) "The
unknotting number of positive braids." 1:30pm, 507 Math.




-------
Newsgroups: nyc.seminars
From: hochberg@ACFCLUSTER.NYU.EDU (Estelle Hochberg)
Subject: IAS Math Seminars, Week of 1/25/93 (Amendment)
Organization: New York University
Date: Fri, 22 Jan 1993 20:16:58 GMT


Please be advised that the PDE Seminar for
Tuesday, January 26 at 11:00 a.m. with
Claude Bardos as guest speaker has been
rescheduled for Tuesday, February 2, at
11:00 a.m. 


Newsgroups: nyc.seminars
From: hochberg@ACFCLUSTER.NYU.EDU (Estelle Hochberg)
Subject: IAS Mathematics Seminars, Week of 1/25/93
Organization: New York University
Date: Fri, 22 Jan 1993 19:51:46 GMT

                        INSTITUTE FOR ADVANCED STUDY
                            School of Mathematics
                             Princeton, NJ 08540 


Mathematics Seminars                            Week of January 25, 1993


MEMBERS SEMINAR                                 Monday          4:00 p.m.
   Speaker:   Alberto Candel, IAS               January 25      Fuld 119
   Topic:     Riemann surface laminations


MIRROR SYMMETRY SEMINAR                         Tuesday         9:30 a.m.
              NO MEETING THIS WEEK              January 26      Fuld 119


PDE SEMINAR                                     Tuesday         11:00 a.m.
   Speaker:   Claude Bardos, Paris VII          January 26      Fuld 119
   Topic:     High frequency asymptotics for control of PDE


SUPER-RIGIDITY SEMINAR                          Wednesday       11:00 a.m.
   Speaker:   Richard Schoen, IAS               January 27      Fuld 119
   Topic:     Harmonic map theory (continued)


GEOMETRY SEMINAR                                Wednesday       2:00 p.m.
   Speaker:   Nicholas Korevaar, IAS            January 27      Lib.  Annex
   Topic:     Upper bounds on high eigenvalues


DIOPHANTINE APPROXIMATION SEMINAR               Wednesday       4:00 p.m.
   Speaker:   Enrico Bombieri, IAS              January 27      Fuld 119
   Topic:     Baker's Method (continued)        


QUANTUM ALGEBRAIC GEOMETRY SEMINAR              Thursday        9:30 a.m.
   Speaker:   Ed Witten, IAS                    January 28      Fuld 119
   Topic:     Sigma models (continued)


APPLIED MATHEMATICS-MATH PHYSICS SEMINAR        Thursday        11:00 a.m.
              NO MEETING THIS WEEK              January 28      Fuld 119


NEWS FROM MOSCOW SEMINAR                        Thursday        2:00 p.m.
   Speaker:   Pierre Deligne, IAS               January 28      Fuld 119
   Topic:     Exceptional objects in derived categories 
                (after A.L. Gorodentsev)


                      Upcoming Seminars

MEMBERS SEMINAR                                 Monday          4:00 p.m.
   Speaker:  Zhenbo Qin, IAS                    February 1      Fuld 119 
   Topic:    Complex structures on S(2) x S(2)



Newsgroups: nyc.test
From: cwahl@panix.com (Charles Wahl)
Subject: yet another test
Organization: PANIX Public Access Unix, NYC
Date: Thu, 21 Jan 1993 04:47:14 GMT

Checking some nn init stuff.

Charles Wahl    <cwahl@panix.com>
Newsgroups: sci.electronics
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: Manufacturer name wanted
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Thu, 28 Jan 93 09:38:44 GMT

Cees Keyer (cees@bongo.htsa.aha.nl) wrote:
: Hello,
: I am looking for the manufacturer of the power mosfet VN10KM,
: On the casing the symbol is a H but i don't think it's a harris transistor
: could someone give me a pointer to the manufacturer.
: 
: TNX in Advance
: 
: Cees Keyer
: 



Hitachi makes semiconductors (although they're mostly into microprocessors).
Give them a try.


Jerry



: 
Newsgroups: sci.electronics
From: pjh@mccc.edu (Pete Holsberg)
Subject: Re: VCR Tuner Partially Inoperative!!
Organization: The College On The Other Side Of Route One
Date: Mon, 25 Jan 1993 02:38:33 GMT

In article <5150068@pollux.svale.hp.com> ryoung@pollux.svale.hp.com (Roderick Young) writes:
=re: some cable channels missing on new VCR
                                    ^^^^^^^
                                    it's a year or two old

=There are a number of different ways that the frequencies are allocated
=for cable channels.  Very likely, there is a slide switch hidden behind
=some door on your VCR, or some on-screen menu item to make the selection.

None of the above, thanks.

Newsgroups: sci.electronics
From: mathias@solomon.technet.sg (Mathias Koerber)
Subject: IPC/Escom Notebook COM2
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 25 Jan 1993 13:34:58 GMT

I bought an Escom Blackmate IV 33MHz Notebook in Germany. The same
thing is distributed here in Singapore by IPC, albeit with only
25Mhz, called Porta PC. It has a funny COM2 port. It is a very small
15-pin connector. IPC sells trackballs to be connected there, including
one that has a builtin Fax-Modem. But I want to connect some other
serial mouse there. So I called IPC to find out what the pin-layout is
and whether I can get a connector to plug in there. I got the
pin-description, but no-one seems to have spare connectors so that I
can make my own converter to 9-pin :-(

Here is the Pin-Out:

	1	GND
	2	SYS_STAT
	3	DSR#
	4	RTS#
	5	CTS#
	6	RI#
	7	not used
	8	GND
	9	+5V in
	10	DTR#
	11	DCD#
	12	TXD
	13	RXD
	14	SPK_DATA
	15	GND

My problem is now to get the connector. It is *very* small, about 2cm in
length with 15 pins in 1 row. I had a sneak look at the IPC trackball,
and the connector had something like S15P..... stamped onto it, what I
guess means sub-15-pin... but I lost that piece of paper.

Could anyone outthere give me a tip on how to get hold of that piece?
ESCOM in Germany also was no help :-(.

Thx alot

Mathias

--
Mathias Koerber	                    | Tel: +65 / 7780066 ext 29
SW International Systems Pte Ltd    | Fax: +65 / 7779401
14 Science Park Drive #04-01        |
The Maxwell, Singapore Science Park | email: mathias@solomon.technet.sg
Singapore 0511                      |        swispl@solomon.technet.sg
-------------------------------------------------------------------------------
* Eifersucht ist eine Leidenschaft, die mit Eifer sucht, was Leiden schafft *
Newsgroups: sci.electronics
From: ers1@cbnewsm.cb.att.com (eugene.r.schroeder)
Subject: Re: DC to AC on large scale???
Organization: AT&T
Date: Fri, 22 Jan 1993 14:59:54 GMT

In article <1jmre4INNfks@rave.larc.nasa.gov> kludge@grissom.larc.nasa.gov (Scott Dorsey) writes:
>In article <1993Jan21.095254.62979@cc.usu.edu> slmdj@cc.usu.edu writes:
>>He is an assistant city engineer for Adelanto, CA, and told me that the way
>>their power is distributed to a large substation is Direct Current!  He said
>>that the DC is then 'phased' or 'converted' so that there is a three-phase AC 
>>line to the city distribution grid.  Neither of us have any idea how this could
>>be accomplished at such power levels (an entire valley, I think!)
>
>They do it with silicon, believe it or not!  They have thyristor switches
>taller than a man, and switch the DC.  This way, they can run DC on the
>long lines at high voltage, which is advantageous since they get more
>power over the same wire (since the limiting factor on the lines is the
>peak voltage before arc-over, and the peak voltage on DC is also equal
>to the average).

The transmission system I am familiar with had two lines
which carried current in opposite directions.  If one line was
down due to a fault or maintainance, they would/could use earth
return!

Because modern DC transmission first became common in Europe,
the term "valve" is often used to describe the switching devices.
One device looks like a hockey puck, and these are stacked together
to form a switch.  The whole thing resides in a "valve hall"
which is completely enclosed by copper for RFI/EMI reasons.

Another advantage of DC transmission, I think, is that it solves
some network stability and synchronization problems.
For example, you can tie together two unsynchronized networks,
or two network where want to minimize the interaction.
I don't know if it would apply in the case you mention though.
The cost of the converter stations, used to at least, make
DC transmission only economical for limited applications.

Gene

>--scott
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: DC to AC on large scale???
Date: 25 Jan 1993 13:57:48 GMT
Organization: NASA Langley Research Center and Reptile Farm
Distribution: world
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <1jp8uvINNb7s@coral.bucknell.edu> rose@bucknell.edu (philip rose `94) writes:
>In article <1993Jan22.134237.13381@waikato.ac.nz>, phys2108@waikato.ac.nz writes:
>
>|> One way I believe they can do it is by using the dc to power a motor, which
>|> then drives an ac generator.
>|> Geoff.
>
>NOOOOO  WAAAAAY!!!
>
>This is done with power electronics,  no motors or generators are involved.

Actually, motor generator sets were pretty common up until about ten years
ago when efficient silicon stuff became available.  You even see AC-DC
conversion done with M-G sets from time to time, dating from the days
before reliable rectifier stacks.  Our local theatre has a pair of 100A
sets that take three phase AC in and produce DC for the projection arcs.
--scott
From: crichmon@sedona.intel.com (Chris Richmond)
Newsgroups: sci.electronics
Subject: Re: Power Amplifiers
Date: 26 Jan 93 16:41:40 GMT
Article-I.D.: inews.C1GzpH.E6I
Organization: Intel Corporation
Originator: crichmon@sedona


In article <1k247hINNsof@shelley.u.washington.edu>, whit@carson.u.washington.edu (John Whitmore) writes:
 In article <1993Jan25.135100.46744@kuhub.cc.ukans.edu> rsl09@kuhub.cc.ukans.edu writes:
 
: >  I am interested in a power amplifier that could drive a DC motor/actuator.
: >I am using the actuator in a slow-response feedback loop. The power amplifier
: >should interface an OP-AMP, that produces the error signal, and the
: >actuator that demands up to 3 Amps for input voltages up to 20 volts.
: >Therefore, I need a push-pull 60 W DC power amplifier. I have been able
: >to find couple of power OP-AMPs that seem to to able to do the job. But,
: >they are expensive - price is around $100. 
: 
: 	And, power op amps can usually NOT handle an inductive load
: (like a motor).  They will burn up (no, internal current limiting
: is NOT a solution here: the problem is reverse-biasing the output
: transistors' emitter junction, and kills the amplifier at LOW current).
: 
: 	If the motor doesn't need to reverse, a PWM switching
: regulator + pass transistor can do a good job.  In the general
: case, you might consider buying a computer-controlled stepping
: motor for the task (but that doesn't interface nicely with
: an op amp feedback circuit...).
: 
: 	John Whitmore

Ah, but consider an Intel 80C196 variety microcontroller.  It can generate the PWM
signals or digitally drive a stepper, and has a built in 10 bit A/D for the
analog feedback.


Chris
-- 
 Chris Richmond         |     Internet: crichmon@sedona.intel.com
 Intel, Corp. C3-21     |     Phone: (602)-554-8827
 5000 W. Chandler Blvd. |     This crazy is a world place. 
 Chandler, AZ  85226    |     My think losing I'm mind.
From: pell@lysator.liu.se (P{r Emanuelsson)
Newsgroups: sci.electronics
Subject: PC on a chip
Date: 26 Jan 93 00:07:26 GMT
Organization: Lysator ACS at Linkoping University

I've heard of a "PC on a chip" - could anyone tell me who makes these?

--
Lysator Computer Society			      pell@lysator.liu.se
University of Linkoping, Sweden	                 ...!uunet!lysator.liu.se!pell
From: ryoung@pollux.svale.hp.com (Roderick Young)
Date: Tue, 26 Jan 1993 02:13:24 GMT
Subject: Re: Mounting Large Axials
Organization: Hewlett Packard CPCD, Sunnyvale CA
Newsgroups: sci.electronics

For a vibration environment, you'll probably need to cushion your heavy
capacitors, as well as secure them.  This may mean a small piece of adhesive
foam or rubber tape under your cap, as well as a mounting bracket (metal or
plastic, could even use tie-wraps).

For something light, but still shock sensitive, like a crystal, you might
be able to get away with just the tape.
Newsgroups: sci.electronics
From: Tony.Duell@launchpad.unc.edu (Tony Duell)
Subject: Re: PAL Software
Organization: University of North Carolina Extended Bulletin Board Service
Date: Tue, 26 Jan 1993 19:40:37 GMT

Re OPAL-Jr
  I got a copy from Elektor, as pat of their GAL programmer software, and
I have a slight problem with the JED2EQN program (PAL disassembler), in
that I can't work out the format of the label file Does anyone out there
know exactly what I should put in a label file, so that my disassemblies
have nice names, not the default i1 etc.
-tony 'PDP11 Hacker' Duell
ard@siva.bris.ac.uk


--
   The opinions expressed are not necessarily those of the University of
     North Carolina at Chapel Hill, the Campus Office for Information
        Technology, or the Experimental Bulletin Board Service.
           internet:  laUNChpad.unc.edu or 152.2.22.80
From: tom@crane.imagen.com (tom lowdermilk)
Newsgroups: sci.electronics
Subject: 80C188EA memory accesses
Date: 25 Jan 93 23:57:16 GMT
Organization: imagen


A what-if question;

I'm designing a memory controller to interface to the 80C188EA. According
to the timing diagrams, there a three cycle status bits S(2:0) which are
valid before the T1 state. The read or write command is valid during the
T2 state. My question is this; if I know what kind of cycle I'll be 
performing even before the command is given, can I let my memory state
machine just look at these status bits when I latch the address, instead
of waiting around for the command. 

- tjl
From: jmains@engr.latech.edu (John P. Mains)
Newsgroups: sci.electronics
Subject: PHOSPHENE AND MAGNETIC PULSES
Date: 24 Jan 1993 02:06:07 GMT
Organization: Louisiana Tech University
Distribution: usa
Reply-To: jmains@engr.latech.edu
NNTP-Posting-Host: vega.engr.latech.edu


Hello,

I am looking for a magnet capable of delivering 10mT pulses at a frequency of
20-25Hz.  This is to be used to study phosphene release in the retina of rats.

If you have any ideas, please responde via email.

---------
Thanx
John P. Mains
La. Tech Biomedical Engineering
From: ajmy@festival.ed.ac.uk (A Myles)
Newsgroups: sci.electronics
Subject: Re: DC to AC on large scale???
Date: 25 Jan 93 09:59:58 GMT

Good ol' blobs of silicon. All the power between France and the UK is
rectified to DC and then inverted back to AC to avoid several problems
such as the huge reactive power that would be required to charge and
dis-charge an underwater cable (not the best way to reactively compensate either
grid). You can use the 3ph fw-rectifier as an inverter too, depending on who
is feeding who. Nice.

The fact that we are 50Hz and France is 60Hz might be observed too. :)

See, say, Landers for some nice piccies of this.

This is too expensive for full-scale dc power as the inverter p.f.
can be pretty poor if the firing angle is too great, and the "blobs"
of Si are pretty big. Using ac and a transformer to tap-off to small
local communities is still much cheaper in general, so ac for now.
Newsgroups: sci.electronics
From: jeremym@fraser.sfu.ca (Jeremy Thomas McDonald)
Subject: Pinouts for 15-pin IBM GamePort?
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Sun, 24 Jan 1993 02:35:07 GMT

Does anyone have the pinouts for the IBM-compatible 15-pin GamePort?
What is the current rating on the +5v pin, if there is a +5v pin?
Thanks in advance.

email to: jeremym@fraser.sfu.ca
-------------------------------
yes, a lowly university student
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Newsgroups: sci.electronics
Subject: Re: My TV is in a funny spot.
Date: 24 Jan 93 15:00:18 GMT
Organization: Northeastern Ohio Universities College of Medicine

The early Rabbits were wireless UHF.  Neighbors of people with
wireless rabbits started complaining when kids started watching the
neighbors' Debbie Does Dallas tapes courtesy rabbits.  The product
was withdrawn and replaced with a wired model.

If I'm not mistaken there is another wireless product that is
somewhere around the 902 MHz region taht is a little above the band
tuned by a standard TV reciever.  The slave sets have to be
equipped with a down converter.  This method allows wireless relay
and keeps the offending signals from being acccidentally picked up
by the people next door.


-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu (140.220.1.1)    146.580: N8WED
From: ame@matt.ksu.ksu.edu (Abdulrahman M El-Koubysi)
Newsgroups: sci.electronics
Subject: What is yttria stabilised zirconia???
Date: 22 Jan 1993 10:02:15 -0600
Organization: Kansas State University
NNTP-Posting-Host: matt.ksu.ksu.edu
Summary: I was trying to find out why they use (YSZ) as substrates for HTS
Keywords: HTS, substrate, yttria stabilised zirconia


I was reading an article lately about High temperature superconductors. The
article mentioned that they use yttria stabilised zirconia substrates. What
is special about this substrate? what makes it different than previously 
used substrates such as silver? Are there companies out there that 
commercially produce these substrates or are they custom made??


A. R. El-Koubysi          | Internet: ame@matt.ksu.ksu.edu
College of Engineering    | Bitnet  : ame@ksuvm
261, Durland hall, KSU    | Phone   : (913) 532-5600 
Manhattan, KS 66506       | Fax     : (913) 532-7810
From: kgantz@cup.portal.com (Ken H Gantz)
Newsgroups: sci.electronics
Subject: Neophyte needs help.....Please!
Date: Wed, 27 Jan 93 17:01:39 PST
Organization: The Portal System (TM)
Distribution: usa

Can someone help me with this?

I have a circuit that that consists of a 12 volt battery
charger (500ma) and an electro magnet. All I want to do
is have the circuit power on for about 1 second and then
shut off for about 1 second and continue in this manner
for hours at a time. It doesn't matter to me if the cycling
is accomplished by interupting power to the charger or by
interupting power from the charger, as long as I can get
my electro magnet to cycle on, off - on, off - on, off, etc..
I first thought I could use an automobile turn signal flasher
but found out that current always flows through the flasher
so the magnet never shuts all the way down. I need the power to
drop completely out between pulses. I have found some things in
electronics catalogs that would work (recycle timers) but the 
cheapest one is about $25.00! Shouldn't I be able to make something
for about $5.00? Of course, adjustable times and a LED that shows
when power is on the magnet would be nice, but I really just need
the thing to turn on and off ad infinitum.

Any advice will be greatly appreciated...


-----------------------------------------
Ken Gantz ..........kgantz@cup.portal.com
-----------------------------------------
Newsgroups: sci.electronics
From: u009@csx.cciw.ca (G. Stewart Beal)
Subject: Re: SOA Sound Chip wanted for uProc Card
Organization: Canada Centre for Inland Waters
Date: Mon, 25 Jan 1993 03:04:47 GMT
Keywords: D/A FM Synth Sound Music Speech SEGA NES NINTENDO SNES

>I was also looking for a sound chip similar to or somewhat simpler
>than you describe. Didn't have too much success. Here's what
>I found:
>
Thanks for the lead. I'll have a go at Yamaha. Another possibility is the
chip used in one or other of the more recent game machines. I'll post the
request separately, but if anyone knows about the (sound) guts of a SNES
or SEGA, let us know.

>Another interesting chip was shown at COMDEX. I'll look it up and 
>post some data. Do you have any info on the PM7528? I missed the
>earlier post.
>
I'll email you.
>
Regards, Stu Beal, VE3MWM, U009@csx.cciw.ca,
National Water Research Institute.
From: garland@ohstpy.mps.ohio-state.edu
Newsgroups: sci.electronics
Subject: Hard Disks: Toss them out when they break?
Date: 24 Jan 93 09:12:19 EST
Organization: The Ohio State University, Department of Physics

I have about a dozen small computers in my labgroup, which we leave on 24 hours
a day. We turn the monitors down when we're not using them, but otherwise leave
everything on. We also blow the dust from the insides every year or so.
Having done this for more than a decade, I find that the reliability is quite
high, except for the fans in the power supplies (which tend to fail after three
or four years), and the hard disk drives.

The hard disks tend to last about three years before they start to go bad.
Historically, we've just tossed them out and replaced them. We've not bothered
with doing a low-level format or otherwise trying to restore them to health,
the rationale being that the replacement costs are low and extracting another
six months or so of life isn't worth the bother. 

I'd like to know if this is a sensible policy? What actually goes bad in the
drive? If the bearings and mechanical parts are actually good for many years,
then perhaps we're being wasteful by throwing them out and, instead, 
should just reformat them every few years and keep on using them? I've seen
software adverstised that claims that we should do this, but I've no idea how
good it really works?  I'd sure appreciate any knowledgable advice. Thanks.
Jim
From: kevin@novell.com (Kevin White)
Newsgroups: sci.electronics
Subject: Re: Starting a mercury lamp
Date: 26 Jan 93 21:08:55 GMT
Organization: Novell Inc., San Jose, Califonia

The "filament" is actually the ballast.  Since the lamp is rated at 250 Watts
you will probably need to be able to pass about 5 Amps through the lamp.
If you don't pass enough current then the lamp won't get hot enough to
attain the curroct vapour pressure and will not work reliably.  If you use
incandescent lamps as a ballast you will need about 500 Watts worth I would
think (an incandescent lamp is almost a constant current device).  The filament
was possibly a barretter, an Iron filament in a hydrogen atmosphere for
current regulation.  I would expect that the mercury lamp drops about 30-50
volts in operation.

The 15 K resistor is probably to provide a voltage between the trigger
terminal and one electrode to ionize the mercury initially to start
operation.

Kevin White