HDTenEightyP/NetNews huggingface dataset:
From: vbreault@rinhp750.gmr.com (Val Breault)
Newsgroups: sci.electronics
Subject: Re: Cable TV Tech Question
Date: 11 Nov 92 14:47:47 GMT
	<1992Nov5.122636.5499@hemlock.cray.com>
	<1992Nov5.181038.17264@doug.cae.wisc.edu>
	<lfti4mINNlfu@jethro.Corp.Sun.COM>
	<VBREAULT.92Nov9164900@rinhp750.gmr.com>
	<ALH.92Nov10104450@nm.cypress.com> <ALH.
Organization: General Motors Research Labs
In-reply-to: alh@cypress.com's message of 10 Nov 92 22:56:55 GMT

In article <ALH.92Nov10165610@nm.cypress.com> alh@cypress.com (Andy Hawkins) writes:

   You say ...

   >Channels 14 and up are in the Ultra High Frequency (UHF) band.  Those
   >frequencies do not lend themselves to wide distribution via cable.
   >Your cable provider cannot and therefore does not send programming
   >via UHF frequencies.

   What I have been thinking about was discussed here earlier, I think.
   I want to get one of the amps that modulate baseband audio/video and or
   remodulate Chan.3/4 to a UHF channel.  Then send these UHF signals 
   throughout my home with COAX.  Also I would like to connect an Ant. 
   to the COAX with a trap for the new UHF channels I've created.  I can 
   add amps and distribution equipment but it sounds to me like the UHF 
   channels might not work well for long distances of COAX.?  Is that 
   what your saying or will that work but it is more effecient to use VHF 
   type frequencies for the cable cos?


I may have been a little vague, but the basic idea is still there....
Please reread the paragraph and note the word "wide".   ;-) 

You can certainly distribute UHF around your house via coaxial cable
providing you are careful in your design and selection of components.

VHF is quite a bit easier to work with though, and I'd suggest that 
you look there first for your solution.

Actually, this sounds like a fun project.  It's certainly well beyond
my abilities and budget, but sounds like fun anyhow.

   BTW, if some one has more inputs on those modulators/re-modulators 
   I'd like to hear them.  
   
   thanks in advance.
   --
   Andrew L. Hawkins, (Andy), alh@cypress.com
   Cypress Southeast Design Center, Starkville, Mississippi
   Ph:(601)324-4634                       Fax:(601)324-4614
   "The Weather is Here, Wish You Were Beautiful."
   --        J.B.-- "COCOANUT TELEGRAPH"

-val-
--

Val Breault - GM Research - vbreault@gmr.com - N8OEF
Instrumentation dept., 30500 Mound Rd., Warren, MI 48090-9055
The opinions expressed by the author do not necessarily reflect 
those of GMR or those of the General Motors Corporation.
 

Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
From: jlb31348@uxa.cso.uiuc.edu (Jim Brain)
Subject: IBM parallel Port
Organization: University of Illinois at Urbana
Date: Wed, 11 Nov 1992 17:36:55 GMT

I need to know if anyone has specifications about using the IBM PC parallel
port for bi-directional data transfer.  I have a 386SX and want to interface
some bus to the p-port, but do not know much about reading the data back in.
I also need to know the effective rate of transfer.  I need 8K bytes per sec.
Please respond, as this has me worried.  (it is for a project that needs to be
coompleted soon (3 weeks).

Jim Brain

-- 
Jim Brain                           "If you build it, they will come."
brain@cs.uiuc.edu
Senior, Computer Engineering		         		Field of Dreams
PowerGlove Serial Interface Designer and Co-Project Leader.
From: tmkk@uiuc.edu (Khan)
Newsgroups: sci.electronics
Subject: Re: Big Brother Radio Shack
Date: 10 Nov 92 18:17:21 GMT
Article-I.D.: news.BxIIsy.A16
Organization: University of Illinois at Urbana


In article <BxBzJK.BqK@news.udel.edu> bew@brahms.udel.edu (Ben Williams) writes:
>
>I've just read this thread containing 50+ complaints about Radio Shack.
>What I would like to know is:  Why do we have to shop at RS to get
>electronic supplies?  Why aren't there other electronic stores in
>competition with RS?  Well, maybe there are in your area (let me know)
>but where I live they are the only thing going. And boy is that ever
>frustrating!

Man, you AIN'T a-kiddin'!!!

That's why RS sells as much as it does - they're ubiquitous, and are the
ONLY outlets for some items in many areas. For many people, it's either
do business with RS and subject yourself to intrusive questioning, or do
without. :-(
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: UNDERPOWERED HALOGEN LAMPS
Date: 6 Nov 1992 17:37:22 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <27806@castle.ed.ac.uk> cam@castle.ed.ac.uk (Chris Malcolm) writes:
>I have read that running halogen lamps on reduced voltage will shorten
>their life, the argument being that their life depends on a cycle of
>tungsten sublimation and redeposition which requires a certain
>temperature to work. However, it seems to me that at lower
>temperatures where it doesn't work (so well) it is not needed, i.e.,
>tungsten/halogens should have the same kind of life/voltage graph as
>ordinary vacuum tungstens.

The last time this came up on the net, I gave it a try.  For the consumer
lamps it doesn't seem to hurt them even if they are operated below 50%
voltage.  For the photoflood lamps (3400'K) it dramatically shortens their
life even if run 10% to 20% below rated line voltage.
--scott
From: awest@ub.d.umn.edu (The Piano Man)
Newsgroups: sci.electronics
Subject: 110v --> 220v Transformer?
Date: 13 Nov 1992 13:16:44 -0600
Organization: University of Minnesota, Duluth
NNTP-Posting-Host: ub.d.umn.edu

I have two digital keyboards that I purchased in Germany.  They both run on
220v current, and I have since moved back to the US.  Can anybody tell me
ideas as to how I could convert them for use over here?  Can I find 110v -->
220v transformers?  (We had 220v --> 110v in Germany...but I never saw them
the other way).

Please email suggestions or comments.

Andrew West
University of Minnesota-Duluth
awest@ub.d.umn.edu

-- 
   |  |)  |==|  "We're all in the    *
   |  |   |  |   mood for a melody,  * 
  *. *   *  *    and you've got us   * 
		 feelin' alright."   *
From: ebd0@ns1.cc.lehigh.edu (EDWARD BAYKAR DERVISHIAN)
Newsgroups: sci.electronics
Subject: help with a cd player
Date: 13 Nov 92 03:53:50 GMT
Organization: Lehigh University

I have a pioneer cd player that suddenly decided not to work. I took it apart
and decided that the diode for reading the tracs must not be working right.
However, I looked in a catalogue and they don't just sell the diode. You have
to buy the whole part with the lens which costs in the neighborhood of $95.
Does anyone know if I CAN purchase just the diode for this cd player? It's a
single disc pioneer cd player. Thanks in advance.
                     Ed

                     
-- 
////////////////////////////////////////////////////////////////////////
Edward Dervishian - The Eternal Spirit of the Underworld!
PHONE:  1-215-758-1409      * "Either up your nose, or through your
ADDRESS:  Box 0686          *  vein, with nothing to gain except
          Lehigh University *  killing your brain! Freeze!"
          Bethlehem, PA     *
          18015             *
Newsgroups: sci.electronics
From: n3022@cray.com (Jim Knoll)
Subject: Sams Photofact
Keywords: Sams
Reply-To: n3022@cray.com
Organization: Cray Research, Inc.
Date: 12 Nov 92 08:20:25 CST

Does anyone know the 1-800 number for the Howard Sams Company
for ordering Sams Photofacts?


Jim Knoll
n3022@cray.com
From: mcs@wet.UUCP (Gil Nardo)
Newsgroups: sci.electronics
Subject: Re: Motorola S19 ==> S2 record. How?
Date: 11 Nov 92 07:00:43 GMT
Distribution: usa
Organization: Wetware Diversions, San Francisco

U40348@uicvm.uic.edu (Jay Lorenzana) writes:
> Our school is ill-equipped.  We have an old eprom burners
> that will only program Motorola S1 and S2 record files.  How
> can I convert my S19 record file to S1 and S2?
> Are there any complications in modifying hex files?
> And what is a hex to obj file converter?
> Thanks for any help you can give,
>                                   Jay
> A piece of my s19 rec:
> S123C00000000000000000BDC048BDC09ABDC063BDC0A5BDC0BA7FC0037DC0002605BDC0E0
> S123C020CE20F30F7DC002261A1A8300FF2B02200DCE10001F2E40FC962ED72F20D5BDC2F2
> S123C0408120D0BDC28B20CBCE10008EDFFF862F97EECCD000DDEFC60CE73F86100686016F
> ......
> lines deleted
> ......
> S123C3E02A2A204552524F52202A2A202020202020202020202020202020202055702020A2
> S121C40020202020202020202020446F776E204A4F59535449434B204D4F444520202D
> S123D0008600BDC285FEC001140301BDC156432607BDC110BDC0BA3B432607BDC237BDC0C4
> S123D020BA3B432607BDC1CFBDC0BA3B4326158C000026013BBDC1D01400017DC00427038E
> S121D040BDC0BA3B8C00002603BDC110BDC0FDBDC14F8C00112706BDC0BABDC3313BE5
> S9030000FC

The sample you have shown appear to be the usual S-records,
where S1 lines refer to 2 byte address references, and the
S9 line terminates the S1 block.
I'm not sure what exactly it is you are trying to do. The
two possibilities are that you are trying to decipher what
each line means, and/or you are trying to convert S1 records
to S2 records, i.e., your eprom burner only accepts 3 byte
address references.  If you are trying to interpret the S1
records, here's an example:

S123D020BA3B432607BDC1CFBDC0BA3B4326158C000026013BBDC1D01400017DC00427038E

S1 - indicates a 2 byte address location for data

23 - there are 35 bytes to interpret (70 ascii chars past this point)
	hex(23) = dec(35)

D020 - this is the 2 byte address where data bytes are going to go
	hex(D020) = dec(53280)

BA3B432607BDC1CFBDC0BA3B4326158C000026013BBDC1D01400017DC0042703
	34 data bytes expressed as ascii-hex pairs

8E - this is the checksum, which is the least significant byte of the
	 one's complement of the sum of the values. In this case

	checksum = 23 + D0 + 20 + BA + ... + 03 = c71
	~checksum = FFFFFFF38F
        checksum+1 = FFFFFFF38E
	LSBYTE(checksum) = 8E



The S9 line is interpreted as follows:

S9030000FC

S9 - end of S1 lines that preceded this line
03 - 3 more bytes follow (6 chars past this point)
0000 - address field
FC - checksum of this record (same formulation as S1 record above)

If you need to convert from an S-Record file to a binary image, there
is a program at the motorola BBS called convert.exe.  The BBS number
is 1-512-891-FREE.
-- 
Gil Nardo                  | mcs@wet.com
Migrant Computing Services | (415)664-1032
1032 Irving Street, #435   |-----------------
San Francisco, 94122       | Supernova = *!
Xref: sparky sci.electronics:18345 misc.forsale.computers.pc-clone:597 misc.forsale.computers.d:272
From: csmith@plains.NoDak.edu (Carl Smith)
Newsgroups: sci.electronics,misc.forsale.computers.pc-clone,misc.forsale.computers.d
Subject: Re: 486 CPU KOOLERS FOR SALE
Date: 5 Nov 92 06:20:26 GMT
Article-I.D.: ns1.Bx8CA2.GF2
Organization: North Dakota Higher Education Computing Network

In article <1992Nov05.024950.15606@kksys.com> gk@kksys.com (Greg Kemnitz) writes:
>I really am open to considering the alternative viewpoint.  But please back
>it with specifics that show that the problem exists, not merely that it
>COULD exist.

It is a known fact that the cooler a semiconductor device runs, the longer
it will last.  The question is if the extended life will be of use to you.
If you are planning on keeping your PC for only 3 years and it will last
4 or 5 with no CPU cooler, why spend the money to extend it's life to 
7 or 8 years?  I believe that this is the case for most of the PC's, which
end up in use by businesses and are replaced in short order.

But the majority of readers of this group who would consider buying
a cooler for our PC are probably installing it on a personal machine
at home, and intend on keeping the machine for more than a few short
years.  Then long term reliability must be considered.

Look at it this way.  About a year ago I spent $3200 for a good quality
486/33 system.  If the cooler is $30, that is less than one percent of
the cost of the system.  If it extends the life of my system by more
than 1%, then it pays for itself.  And since it is my own system at home,
and I intend on keeping it for a good long time (that's why I got a 486/33,
so it wouldn't be obsolete so fast) it is very likely that it will get
to an age where long term heat problems may cause failure.  In short, in
this situation, I think that the $30 is worth the extended life.

I guess a more meaningful calculation would be to use the price
of the CPU.  Grabbing the first (and probably overpriced) catalog
on my desk, I see they want $500 for a 486/33 (that seems a high, but
I'll use that number as an example).  So $30 for a cooler is 6% of the
price of the CPU, so if it extends the CPU's life by more than 6%, it
has paid for itself in economical terms.  (And I am sure that it will
extend the life by at least 6%).   But again, this only matters if
you plan on keeping your PC long enough that long term heat induced
problems might occur.  I do...
From: bmw@isgtec.com (Bruce M. Walker)
Newsgroups: sci.electronics
Subject: Re: Disk drive fails when pc card plugged, why?
Date: 9 Nov 92 19:03:44 GMT
Distribution: usa
Organization: ISG Technologies Inc., Mississauga Ontario

In article <40712@sdcc12.ucsd.edu> vwass@sdcc13.ucsd.edu (Vincent Wass) writes:
> I am having trouble with a computer interface project.  I'm trying
> to decode addresses on the bus for my own plug-in wire-wrap card.
> So I used a 74ls688 compare chip to
> decode address lines A2 to A9, and then I wired A0 and A1 to an 8255
> chip.  I've wired the address to be 300hex.  I've also tried 280hex,
> but I had the same problem [, disk-related errors].
 
Here are some things to watch out for:

a) keep all wires to the card edge fingers (ie the bus) *really* short.
   The best way to ensure this is to place the sockets for the bus
   buffers right along the closest row of holes to the fingers.
   Do not exceed two inches.  Really.

b) buffer *all* signals with a single LS TTL load.  The IBM "spec" says two
   LS loads, but some buses are longer and some cards cheat.  A fully loaded
   system may become overloaded when you add your board.

   This also means you should buffer the lines going to the 8255; stick
   in an LS244 and ground the /enable (always on) and buffer A0, A1,
   /RD, /WR, etc.  A MOS device like the 8255 represents a capacitive load
   that slows the risetime of those bus signals.

c) use a utility to map out what i/o devices are in your system.  0x300
   and 0x280 are likely OK, but some older PCs and XTs used 0x300 for the
   time-of-day clock.

Have fun!

--
"The path of my life is strewn with cowpats from the devils' own herd."
                                          -- Edmund Blackadder II
bmw@isgtec.com   [ ...!uunet.ca!isgtec!bmw ]  Bruce Walker
From: geek+@CMU.EDU (Brian E. Gallew)
Newsgroups: sci.electronics
Subject: Monitors
Date: 9 Nov 92 03:53:27 GMT
Article-I.D.: andrew.UezapLq00VB3MIcLhC
Organization: Administrative Computing & Info Services, Carnegie Mellon, Pittsburgh, PA

Are there any companies that sell color monitors, as opposed to TV's?
Since I own a VCR, I can't see buying a TV with it's own tuning
system.  A monitor should (hopefully) be cheaper than a TV.  I don't
even need any sound in the monitor, as I run the audio output of the
VCR through my stereo.

                                  -Brian

-------------------------------------------------------------------------
| "Are they dead?"                                                      |
| "Does it matter?"                                                     |
|   - Pugsley and Wednesday in "The Addams Family."                     |
-------------------------------------------------------------------------
Newsgroups: sci.electronics
From: arm@helix.nih.gov (Andrew Mitz)
Subject: Re: Software for touchtone generation; will it work?
Followup-To: sci.electronics
Organization: National Institutes of Health, Bethesda
Distribution: World
Date: Wed, 11 Nov 1992 16:27:42 GMT

In article <921110124732.2381ce70@CCSUA.CTSTATEU.EDU> FELSON_ADJ@CCSUA.CTSTATEU.EDU writes:
>Can a squarewave output be used to reliable generate
>touch tones?  I'm planning on writing some machine code
>software for an HP48 calculator that would do the following:
>  scan two sine wave tables ( or use two pointers into a single table )
>  add the two together, and turn the speaker on whenever the sine
>  is positive.  
>
>This would be basically a cliped version of the dual done MTMF signal.
>Anyone know if this will be too distorted for the phone company to accept?


You mean DTMF.  I don't remember the spec in detail, but you should 
consider that one tone is supposed to be at a different amplitude
than the other tone.


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

All opinions expressed are my own.


Newsgroups: sci.electronics
From: patw@cserver.plexus.com (Pat Wilson)
Subject: >>FCC part 68 pre-certified DAA
Organization: Plexus Corp. -- Neenah Wisconsin
Date: Thu, 5 Nov 1992 19:22:18 GMT

jeffj@krfiny.uucp (J. Jonas) writes:

>>In article <1992Nov3.002007.3458@netcom.com> kehoe@netcom.com
>>(Thomas David Kehoe) writes:
>>>I heard that someone, maybe Motorola, makes a chip
>>>that isolates devices from telephone lines, allowing
>>>a device that has not been certified under FCC Part 68
>>>to connect to the network.
>>
>In article <1992Nov3.234141.6903@kodak.kodak.com> ornitz@kodak.kodak.com
>	(Barry Ornitz) writes:
>>There are modules made by companies like Cermetek that SIMPLIFY getting Part
>>68 certification but they do NOT eliminate the process.  Face the fact that
>>anything connected to the telephone lines directly must be certified.

>Huh?  I read in the Cermetek DAA data sheets that the FCC part 68
>certification was transferrable to whatever equipment used
>the DAA for the phone interface.

Yes, you can buy DAA's from Cermetek and Xecom which are pre-certified
for FCC part 68.  If you embed them in your product, the certification
is transferrable.  There are also component modems available which
are pre-certified.

Newsgroups: sci.electronics
From: doherty@melpar (Kevin Doherty)
Subject: Re: IR detector tube wanted
Organization: E-Systems, Melpar Division
Date: Thu, 5 Nov 1992 12:14:39 GMT
Keywords: IR,infra red,help

cstadbg@csv.warwick.ac.uk (Mr M J Brown) writes:

>Does anybody know of a source and rough prices of IR detector tubes, I 
>mean the sort which take IR light focused into one end and form a green
>picture at the other....I have been unable to find a source for these...

>If anybody can help, mail me at cstadbg@csv.warwick.ac.uk 

I assume you're referring to image intensifier tubes (aka microchannel
plates or MCP's), since these are the only imaging tube in common use
that preserves geometric information.

New tubes run arount $1.5K plus, but you can pick up used ones for circa
$800 from an outfit called MWK incorporated.  These tubes have a built in
power supply (give 'em 3 volts and you're in business), but they ARE used,
and MCP's tend to have limited lifetimes (on the order of 500 to several
thousand hours).

If you want the address, let me know.
Newsgroups: sci.electronics
From: medin@catbyte.b30.ingr.com (Dave Medin)
Subject: Re: 12 V -> 3V, 0.6 A
Reply-To: medin@catbyte.b30.ingr.com
Organization: Intergraph Corporation, Huntsville AL
Date: Wed, 11 Nov 1992 17:56:14 GMT

In article <d1temp.721464879@dtek.chalmers.se>, d1temp@dtek.chalmers.se (Michael Tempsch) writes:
|> msunde01@mik.uky.edu (Mark  Underwood) writes:
|> 
|>  Ever looked inside one of the original converters?
|>  I have one, it has 7 1N4001 diodes i series... (the CD wants 5-7 V in)

The poster's player needed 3 volts, though, and the rules are different
because the battery voltage is so low. Accuracy becomes much more important

|>  Most batteryoperated devices aren't that touchy about input voltage,
|>  there is a small ;-} difference in battery voltage between fresh batteries
|>  at standby and almost dead at full output...

When the operating voltage gets lower, the device gets much more touchy
as there is little voltage headroom, thus internal regulators are usually
omitted or have very little gain and the device relies upon the relatively
stable battery output voltage over its life. The non-regulated diode
voltage dropper becomes a hit and miss proposition as the voltage
drops of the diodes over the current range of the adapter are hard
to predict. They are not a rock-steady 0.7 volts. Another problem, noted
by another poster, was that the car battery voltage varies quite a bit
(engine on, high RPM, engine off, load dump spikes). With a diode
dropper, these differences are passed on DIRECTLY rather than proportionally
or not at all. A regulator, for the the additional $1 US, is thus worth
it...

-- 
 --------------------------------------------------------------------
       Dave Medin			Phone:	(205) 730-3169 (w)
    Intergraph Corp.				(205) 837-1174 (h)
       M/S GD3004
  Huntsville, AL 35894 		Internet: medin@catbyte.b30.ingr.com
				UUCP:  ...uunet!ingr!b30!catbyte!medin

   ******* Everywhere You Look (at least around my office) *******

 * The opinions expressed here are mine (or those of my machine)
From: jrusmise@ee.ubc.ca (RUSMISEL JASON DIRK)
Newsgroups: sci.electronics
Subject: Reading and Writing IBM pc parallel port
Date: 12 Nov 92 22:09:31 GMT
Article-I.D.: ee.1992Nov12.220931.7242
Distribution: sci.electronics comp.periphs
Organization: University of BC, Electrical Engineering


  I have a question about the using the IBM pc parallel port as an input 
and output port rather than for printer stuff.  I plan to use the 
parallel port on my PC to interface to an external device (a D/A converter.)

I have been experimenting with writing to the parallel port using BIOS int 17h
on the pc, but it isn't working.  Using this interrupt, I am able to reset
the printer and get printer status, but when I try to send a byte to the 
printer, nothing happens and the returned diagnostic says the printer is
out of paper (which is not true.)  (BTW, I am keeping the printer plugged into
the port for testing... "let`s see if this works!")

My questions:

1)  Am I doing something wrong with BIOS int 17h (I`m pretty sure it was 17h
	I don't have my notes here right now).  Is there some special
	initialization I may have overlooked?

2)  Am I on the wrong track.  Is there a more straightforward way of sending
	data to the parallel port a byte at a time. ( I need strict timing
	between data transfers.) Should I be looking at the MSDOS printer
	handling interrupts?

3)  Should I be accessing the parallel port card directly (outport(XX).) Can
	this be done, ort is it a scary hidden nightmare of registers and
	initialization?

4)  Once I figure out how to write to the port, is there a corresponding
	read that can be done with the same method?  



I would appreciate any answers to all or some of the above questions.  
Please respond by emailing (preferably) or by posting (Yes honey, I'm working
no, no, It's not readnews  :))


Thanks,

Jason Rusmisel

jrusmise@fs0.ee.ubc.ca