HDTenEightyP/NetNews huggingface dataset:
From: jon_sree@world.std.com (Jon Sreekanth)
Subject: BASIC for Intel 8031 (8051) 
Organization: The World
Distribution: sci
Date: Thu, 13 Aug 1992 01:59:46 GMT


I'm looking at buying a BASIC compiler for the Intel 8031 (8051). 
From ads in Circuit Cellar Ink, I found two likely suspects : 

Binary Technology Inc (508-369-9556) BXC51 for $295

Systronix Inc (801-487-7412) BCI-51, price not listed. 

I called for literature, and I'm waiting for it. In the meantime, 
can someone tell me what one looks for in a microcontroller BASIC ?
What features are important, what are some things to watch out for ?

Has anyone used either of these two packages ? Any opinions ? Any other 
BASIC's I should be looking at ? 

Thanks for any information, 

/ Jon Sreekanth

Assabet Valley Microsystems, Inc.           |  Fax and PC products
5 Walden St #3, Cambridge, MA 02140         |  (617) 876-8019
jon_sree@world.std.com                      |
From: pds@ohm.york.ac.uk (Paul D Stringer)
Newsgroups: sci.electronics
Subject: RDS DECODER SOFTWARE
Summary: RDS decoder software
Date: 20 Aug 92 15:56:21 GMT
Organization: Electronics Department, University of York, UK

I have just completed the building of a radio-data-system demodulator 
which extracts digital information from FM radio transmission.

The output of the demodulator comprises of a data stream which
requires further processing the achieve BLOCK and group
synchronistaion of the data bits, error correction and finally
extraction of data (time,radio station name etc).

I know that this part of the design can be implemented in software
and would therefore appreciate any help that anybody could give me
(possibly some code etc).

Please reply via e-mail  :  pds@ohm.york.ac.uk

Thankyou in advance.

Paul Stringer
Department of electronics 
University of York
ENGLAND 
Newsgroups: sci.electronics
From: wlsmith@valve.heart.rri.uwo.ca (Wayne Smith)
Subject: Raytel (CT scanner?) boards (for sale or dismemberment)
Organization: The John P. Robarts Research Institute, London, Ontario
Date: Thu, 13 Aug 1992 02:03:17 GMT

I have at least 50 PC boards that were part of (I think) some kind of
CT scanner made by (or marketed by) GE.  These boards have Raytel
systems corporation on the silkscreen.  They are 12 inches wide and
15 inches long.

This system (which was donated) was never put together, and included
about a dozen b&w monitors and a few keyboard consoles, and some
boards have been scavanged for parts.  Some boards have 1983 marked on
them, and some parts are circa 1985.

If anyone out there has the need for some of these boards (as replacements
for a working unit) then I'm sure we can do business.
Otherwise what is the net-wisdom for doing mass-desoldering on these
boards?  Also, a brief description of the following IC's would be
appreciated...

74LS:
491,645,299,640,670

And some PAL's:
Texas Instruments TIBPAL16R8-15CN
unknown-> MMI  PAL20L8ACNS
(are these pal's useful/re-usable?)

Memory:
Mitsubishi M5M4C264P (24 pin .4" wide)
           M5M4256P  (16 pin)
NEC:       D41264C

Some AMD stuff:
AM2966PC, P8259A, P8253, 8151

And a really big chip:
(Signetics?) SCC63484C8N64001U (64 pin dip)

...
Newsgroups: sci.electronics
From: byron@cc.gatech.edu (Byron A Jeff)
Subject: Re: "Chip chat" AY-3-1015 
Organization: Georgia Institute of Technology
Date: Wed, 19 Aug 1992 17:19:08 GMT

In article <10666281.14.714208429@eng2.eng.monash.edu.au> 10666281@eng2.eng.monash.edu.au (KEVIN PRATER) writes:
>I ve just dug out an old project for an xy plotter
>from electronics and wireless world dec 1984.
>It had a chip marked AY-3-1015 which they said was a uart chip.
>can I substitute a NS16450 at uart for this?

I don't think so. One of the features of the above UART is that it could
be hardwired into whatever configuration your needed. Most up to date
UARTS (such as the 16450) use CPU programmed registers for setup. Call
Jameco, JDR, Mouser, DigiKey, Unicorn, B.G. Micro and other electronic 
supply places because you may still be able to get that part. DigiKey
can be reached at 1-800-DIGI-KEY. The other always have adds in magazines
such as Byte, Circuit Cellar INK, ComputerCraft and Radio Electronics.

>And has anyone know the address of EWW  or the original full circuit
>diagrams? 

Can't help you there. Maybe they turned into Radio Electronics????

>thanks 
>Kevin Prater

No problem,

BAJ
---
Another random extraction from the mental bit stream of...
Byron A. Jeff - PhD student operating in parallel!
Georgia Tech, Atlanta GA 30332   Internet: byron@cc.gatech.edu
From: ghg@en.ecn.purdue.edu (George Goble)
Newsgroups: sci.electronics
Subject: Re: Nicad Zapper
Date: 16 Aug 92 22:04:10 GMT
Organization: Purdue University Engineering Computer Network

In article <11AUG199210550479@rover.uchicago.edu> frank@rover.uchicago.edu writes:
>In article <1992Aug7.161224.29053@awdprime.austin.ibm.com>, dewey@vpdbox.austin.ibm.com writes...
>>All the talk about NiCad Memory and such, I decided to post this.
>> 
>>"One of the most useful and money saving kits you can buy!, The Nicad
>>Zapper Kit repairs those nicads that no longer will take a charge
>>due to the growth of interal 'whiskers'. The Zapper operates from
>>6VDC (battery not included) and develops 300 VDC which it momentarily
>>applies to the nicad to 'blow the whiskers' without damagaing the battery. 
>>Repairs about 90% of nicads in sizes AA to C cells. After zapping, the
>>nicad is ready to be fully charged again. Size of board: 2.6" x 2.7".
>>Complete with all parts, PC boards and instructions. Skill Level 3."
>> 
>> 
>>Anyone have any comments about such a device.
>
>	From one of Bob Pease's articles, a simpler zapper consists of
>	charging a 500ufd battery to around 12 volts, then discharging
>	it into the cell. If that doesn't work, up the cap by a factor of 10.
>
>	I have tried it, it does work, batteries with a dead short do come
>	back to life. Don't think 300 volts is necessary, main question is
>	how much energy (charge * voltage) to dump into a battery to blow
>	the wiskers. Like Bob's idea of starting out small, then going up
>	in capacitance in steps.

How about 120,000 ufd @ 55V.  I inherited a 7.5V cell phone pack with
two shorted cells.  A battery "reconditioner" (has caps to zap it for
whiskers), didn't heal it for long.  I zapped it with the above cap,
didn't work either.  The pack has some sort of positive temp coef
device which goes open circuit above about 1 amp or so.  Short circuit
protection.  This limits the amount of zap.  I popped open the pack
(AA cells, 700 mah or so), located the two shorted cells. I charged up
the cap to 55V, and administered it with clip leads and paper clips to
the cell casings (bad idea).  The paper clip vaporized (like a black-cat
firecracker), and burned a hole into the side of the cell, about 1/8"
deep (you could see the wrappings/foil).  It got rid of the short though.
I sealed it up right away with refrigeration epoxy.. Dunno how well
that pack will work.  My orig cell phone packs are still performing
well (approx 2200 charge/discharge cycles over 6 years now).. but
they have been "taken care of".  Slow charging (16 & 24 hour rates),
and discharged down to 1.1V per cell.  One pack shorted a cell last dec
from whiskers, but the cap zapped it ok (did not open it up to bypass
the current limiter).  

I have heard that pulse charging Nicads with 10X the current at 10%
duty cycle keeps the whiskers down. Any of you used chargers which
sense the slight voltage depression at end of charge to terminate
a "fast charge"?

--ghg
Newsgroups: sci.electronics
From: helfman@aero.org (Robert S. Helfman)
Subject: Re: EIA-232 cable length restrictions
Organization: The Aerospace Corporation, El Segundo, CA
Date: Tue, 18 Aug 1992 07:14:52 GMT

In article <1992Aug17.192021.4354@miles.com> jep@miles.com (Joseph Perry) writes:
>I'm trying to determine the maximum cable length for EIA-232 connections.  
>EIA-232 specifies that the effective shunt capacitance of the receiver 
>side of the interchange circuit be no more that 2500 picofarads.
>
.....Stuff deleted......

>Have I missed something in my measurements and analysis or is the EIA-232
>standard overly conservative in limiting cable length?

It is VERY conservative. We run terminals at 9.6k and printers at
19.2 using twisted pair, unshielded, running in bundles with dozens of
other similar circuits, all over the building. Runs of three hundred feet
are typical. No hay problema (there's no problem).
 



Newsgroups: sci.electronics
From: jeg@sangabriel.desktalk.com (John E. Greene)
Subject: Re: Looking for LP RF module
Organization: Desktalk Systems Inc.
Date: Thu, 13 Aug 1992 17:08:09 GMT

In article <1992Aug13.131007.7535@phcomgw.seri.philips.nl> grimaldo@tokyo.seri.philips.nl (Emilio Grimaldo) writes:
>Hi,
>   I am looking for almost any low-power RF module that operates at no more
>   than 6 Volts. Like those used in cordless telephone sets. The operating
>   frequency is unimportant (could be 49MHz, 900MHz...) and it would 
>   preferably have multi-channel capabilities. And yes I need only one set
>   (for base and remote unit) for a personal experiment.
>
>   Any information about a company selling small quantities is welcome.

For the transmitter you may want to look into Motorola's MC13175/MC13176.
It operates from 1.8 to 5 volts and has draws 10ma when operating.  A control
line can put it in powerdown mode where it draws a mere 1 uA.  It's an AM/FM
Transmitter capable of operating up to 950 MHz.


Newsgroups: sci.electronics
From: johana!tsw@apple.com (Tom Watson)
Newsgroups: sci.electronics
Subject: Re: Shock the Monkey II
Date: 12 Aug 92 01:28:20 GMT
Organization: FBN/GRQ Ink.

In article <1992Aug11.214520.15039@tvnews.tv.tek.com>, bill@thd.tv.tek.com (William K. McFadden) writes:
> 
> 
> Since the stories I posted a few weeks ago were so popular, I got my
> friend and former college roommate, Tim "Doc" Corrie to share some more
> of them.  Some aren't "shocking" but are nevertheless included for
> their entertainment value.
> 

..Many good interesting stories...

Maybe we should start a new newsgroup...
sci.carl&jerry

Just an interesting thought...
------
Tom Watson
johana!tsw@apple.com
Newsgroups: sci.electronics
From: gude@uniwa.uwa.edu.au (David J W Emrich)
Subject: Electric Blankets and Sterility
Summary: Is there a connection?
Keywords: Electric Blankets Sterility
Organization: University of Western Australia
Date: Wed, 19 Aug 1992 17:03:03 GMT

Hi Netland!

I have an interesting subject to broach, one that has caused my
curiosity to be piqued during a recent discussion.

The idea is this...
Recently, I heard a theory that Electric Blankets (eg. a fairly heavy
cotton/synthetic mix double layer cloth, with two interleaved woven
heating coils sandwiched in between), emits enough electromagnetic field
energy that, if the user sleeps on one all night for some period of
time, it can cause sterility, in people (of both sexes) who are already
pre-disposed to sterility.  THere is also some notion that they can
cause cancer.

  Does anyone have any more info on this.  ??
Namely...
1.  What does it mean to be "pre-disposed" toward sterility?
2.  How long is "some period of time", months, years ?
3.  Is there any field emitted when the blanket is switched off?
4.  What about the cancer risk?

Obviously, the simple answer is, no one really knows yet, but it would
be safer to use the device to just heat up a bed, and when one actually
climbs in to bed, the blanket should be turned off.

I think there has been some research done on this, but I would be
interested to see people's reaction.

Please Email me with your ideas/suggestions/statistics, and I will
compile a summary of all the best and fairest answers.

David Emrich
gude@uniwa.uwa.edu.au
From: u9dmlb@ohm.york.ac.uk (Duncan McL Barclay)
Newsgroups: sci.electronics
Subject: Electrolytic Capacitors
Date: 18 Aug 92 20:08:16 GMT
Organization: Electronics Department, University of York, UK

I need a little help please.

I an trying to work out what the parasitics in electrolytics
capacitors do in terms of degrading the filtering of a standard
bridge rectifier-capacitor filtering unit.

In the catalogues two or three figures of merit are quoted:

	The ESR, equivalent series resistance,
	The loss tangent
	The impedance at ususally 10KHz.

Having looked up some application notes I discovered the following:
(all taken from Phillips/Mullard notes)

Model of an electrolytic is:
                              _____
	-/\/\/\/\------| |----|   |---
                    | _____ | -----
	            --|   |--
                      -----

A series inductor,L, a series capacitor C, a series resitor Rs, and
a leakage resisior Rp.

The capacitance is measured at 100Hz along with the ESR (ie Rs).
The loss tangent is also measured at 100Hz and is defined by
    tan (delta) = 2*pi*100*C*Rs
The impedance mentioned above is given by
	Z^2 = Rs^2 + (2*pi*f*L - 1/(2*pi*f*C))^2
where f = 10,000Hz.

The problem is that the quoted values of Rs (ESR)
and impedance Z do not fit the model (we have ignored the leakage resisitor
as this is a few meg at least). In essence I cannot calculate the value
of L from the data given.

for example a standard 10,000uF 40V capacitor from a big UK supplier has an
ESR of 18mohms and Z of 13mohms. Just thinking about this and the equation
for Z there is a problem because how can Z be less than Rs ie 18milliohms?

Am I missing something, am I better off getting a few capacitors and
measuring the resonance to get L?

At the end (apart from building the final item) I want to model the
psu in SPICE so I can actually find the "best" solution to getting good
filtering as well as smoothing.

If anyone has another helpful hints like inductive filtering these would
be welcome.

Thanks in advance

Raggy

-- 
Raggy                 | God smiles upon the little children, the alcoholics, and
u9dmlb@ohm.york.ac.uk | the permanantly stoned. S.King.
Newsgroups: sci.electronics
From: enns@waterloo.hp.com (Roger Enns)
Subject: Re: Strobe circuits wanted
Date: Fri, 21 Aug 1992 12:17:04 GMT
Organization: HP Panacom Div Waterloo ON Canada
X-Newsreader: Tin 1.1scd1 PL5

I've got a couple of different strobe circuits on my desk right
now.  They were both designed for use in homebuilt aircraft, as a
collision avoidance mechanism.  The magazine 'Kitplanes', issue
March 1990 is one reference, while 'Sport Aviation', October 1982
is the second.  The circuits are similar except for the methods
of converting the dc input into ac for the transformer.  I will
mail copies to you if you are having trouble locating these, or
other useful references.
--
Roger Enns (enns@waterloo.hp.com) Panacom Automation Division, HP
C-GIIV Dragonfly, 1979 RX7 13B, 1985 Colt, 1984 Interceptor 500
Newsgroups: sci.electronics
From: jkubicky@cco.caltech.edu (Joseph J. Kubicky)
Subject: Where to find condutive silicone rubber sheets?
Organization: California Institute of Technology, Pasadena
Date: Fri, 14 Aug 1992 19:51:08 GMT


Does anyone know where I can get conductive silicone rubber sheets around
1mm thick (although I might be interested in thinner)?  I'd like to try
to use these to make a simple tactile sensor.  Also, can anyone recommend
a good conductive glue (I've heard of something called "Silver Loaded" by
RS Ltd.) and a source for it?

Thanks,

Jay Kubicky
jkubicky@cco.caltech.edu

Newsgroups: sci.electronics,rec.radio.amateur.misc
From: moisan@silver.lcs.mit.edu (David Moisan)
Subject: Data Tech 30A DMM reads 0 ohms
Followup-To: poster
Organization: MIT Laboratory for Computer Science
Date: Wed, 12 Aug 1992 17:34:47 GMT

 
I've a Data Tech DMM, model 30A, circa '77, that has a fault:  On the Kohms 
scale, it reads 0 ohms at all times, regardless of the resistance across the 
test leads.  DC Volts works OK.
 
I'd like to fix this--it's a nice (if old) bench meter, with a _true_ 3-1/2 
digit (5000 count) readout.  Can anyone help?

 Thanks,

Dave
From: bonobo@Ingres.COM (David Victor)
Newsgroups: sci.electronics
Subject: A construction question about front panels for home-brew projects...
Date: 21 Aug 92 01:20:25 GMT
Reply-To: bonobo@Ingres.COM (David Victor)
Distribution: na
Organization: Ask Computer Systems Inc., Ingres Division, Alameda CA 94501

I'm trying to make a nice-looking aluminum front panel for a project,
and I'd like to be able to use rectangular switches, possibly other
squared-off displays, etc.  How do you cut a perfectly-squared-off hole
in an aluminum panel?  Is there some home-brew method I'm not aware of?

Also, what's a good way to do the lettering?  I've got a LaserJet, but
how do you transfer what's on paper to what's on the panel?  

Recently, I heard about a method of PCB manufacture whereby you print
your PCB design to some special type of paper, iron it on a copper-clad
board, and then etch as usual.  Seems to me there might be something
similar for lettering.  That way, you could lay the entire thing out on
a Laser printer, iron it on, and then maybe seal it with some kind of
polymer-based sealant...

-David Victor
From: gkwan@balboa.eng.uci.edu (Greg Kwan)
Subject: Re: Programming 68705P3
Newsgroups: sci.electronics
Organization: University of California, Irvine
Date: 13 Aug 92 03:55:28 GMT

In article <1992Aug12.061702.12388@ssc.wa.com> markz@ssc.wa.com (Mark Zenier) writes:
>In article <2A86F013.2535@noiro.acs.uci.edu> gkwan@balboa.eng.uci.edu (Greg Kwan) writes:
>>In article <1992Aug08.194203.15660@ssc.wa.com> markz@ssc.wa.com (Mark Zenier) writes:
>>>  (Trick number 1, the chip's eprom erases to (as I remember) 0
>>Actually all unused bytes should be $FF.
>No.  Zero.  I had to look at 3 different books before I found this
>in the 1984 spec. sheet.  It's not in the latest Microprocessor 
>Databook I have, nor in the old Users Manual.

I checked. I erred. I'm sorry.

Regular EPROM's erase to $FF; Motorola's MCU EPROM erases to $00 (this
info is from S. J. Cahill's book _The Single Chip Microcomputer_).
Sorry for my confusion.

greg
gkwan@balboa.eng.uci.edu
Newsgroups: sci.electronics
From: dave@imax.imax.com (Dave Martindale)
Subject: Re: class D amps
Organization: Imax Corporation, Mississauga Canada
Date: Mon, 17 Aug 1992 17:09:21 GMT

In article <1992Aug15.220915@aifh.ed.ac.uk> rbs@aisb.ed.ac.uk writes:
>
>Following on from this, I had the idea that an integrated digital CD
>stage class D amp could be constructed where no analgue stage would be
>needed. The circuitry would convert from the PCM data from the disk
>to PWM signals for the loudspeakers.

Circuitry to convert 16-bit data at 44.1 kHz to digital data at about
1.5 MHz is readily available - that's exactly how the "1-bit" DACs
work.  Whether you could build a class-D power amp that would amplify
this signal without radiating RF all over the place is another question,
but if you could, it would eliminate analog stages entirely.  And it
would be efficient.
From: michael@vk2bea.UUCP (Michael G. Katzmann)
Newsgroups: sci.electronics
Subject: Re: Video timing chip ??
Keywords: video, timing
Date: 21 Aug 92 14:29:55 GMT
Reply-To: michael@vk2bea.UUCP (Michael G. Katzmann)
Organization: Broadcast Sports Technology, Crofton. Maryland.

In article <1992Aug18.114507.29839@ms.uky.edu> billq@ms.uky.edu (Billy Quinn) writes:
>I am looking for a chip that will generate the timing signals for
>NTSC video.  I only need Horizontal Sync (Vertical Sync) and
>Blanking.  There are a few chips that offer these, but require some
>programing and do much more that just provide timing signals.  I 

Philips /Mullard  SAA1043 is a good NTSC/PAL/SECAM sync generator. If
you want colour, team it with the SAA1044.  The 1043 can be genlocked too.

-- 
Michael Katzmann	  >	Broadcast Sports Technology Inc.
~~~~~~~~~~~~~~~~	 <	Crofton, Maryland. U.S.A
Amateur Radio Stations:   >
NV3Z / VK2BEA / G4NYV	 <	opel!vk2bea!michael@uunet.uu.net
From: fhl@milton.u.washington.edu (Dean Pentcheff)
Newsgroups: sci.electronics
Subject: Re: GPS Availability
Date: 14 Aug 92 22:15:02 GMT
Reply-To: dean2@tbone.biol.scarolina.edu (Dean Pentcheff)
Followup-To: sci.electronics
Organization: Department of Biology, University of South Carolina, Columbia

mycal@netronix.com (Mycal Johnson) writes:
)In article <7480107@hpfcso.FC.HP.COM> myers@hpfcso.FC.HP.COM writes:
) > GPS is most definitely operational, and GPS receivers are now readily
) > available, albeit with less accuracy than their military cousins.  (The
) > Feds require this to be so, so that some turkey like Sodamn Insane can't
) > use our own positioning system to aim his Scuds to the nearest millimeter!)
) > One of the biggest uses right now is in aviation - check with some private
) > pilots in your area and see if they'll show you some of the latest avionics
) > catalogs.
)Well actually because of the gulf war, the civilian GPS (unencrypted) has
)its resolution cranked way up, still is last time I checked.
)Seems that the US didn't have enough mil GPS systems, so it shipped the
)troops civilian units and cranked up the resolution.

Nope.  Selective Availability (the deliberate pseudorandom "fuzz" introduced
by the DoD) is very much back in force.  Pity.

-Dean
Newsgroups: sci.electronics
From: len@neb (len)
Subject: XT Keyboard
Organization: Nebula BBS - Salt Lake City Utah, USA
Date: Mon, 17 Aug 1992 18:40:15 GMT

	I need to get the source code listing for a XT keyboard (8048).
I want to modify the listing so I can use a diffrent keyboard.


						Thanks

Newsgroups: sci.electronics
From: s2859479@techst02.technion.ac.il (Yaron Keren)
Subject: 220V ac -> 6V DC @ 1mA, how?
Reply-To: s2859479@techst02.technion.ac.il (Yaron Keren)
Organization: Technion, Israel Inst. of Technology
Date: Sat, 15 Aug 1992 08:21:31 GMT

I need to supply 5-8V DC at current of 0.7mA avg, 2mA max from the line
(220V here) voltage. Since the current is very low, I thought to use a
diode-resistor-zener+capacitor as a power supply instead of a tranformer.
What are the disadventages, dangers, etc. inbvolved?
Is there other simple way to do this?

Please email and I'll summarize if there are enough responses.

Yaron
-- 
Yaron Keren                                 s2859479@techst02.technion.ac.il
Newsgroups: sci.electronics
From: kolstad@cae.wisc.edu (Joel Kolstad)
Subject: Re: XT Keyboard
Organization: U of Wisconsin-Madison College of Engineering
Date: 18 Aug 92 03:00:44 CDT

In article <1992Aug17.184015.2495@neb> len@neb (len) writes:
>
>	I need to get the source code listing for a XT keyboard (8048).
>I want to modify the listing so I can use a diffrent keyboard.

You know that just about every EE/CS guy and their brothers
have done their own XT keyboard drivers, right?  It
might help if you standardized on a specific keyboard, such as the original
IBM one for instance -- the chance that source code is availiable for
one of those is much greater than for, say, the Joe's Junk Chinese
Import $10 XT keyboard.

I interfaced an XT keyboard to my Commodore 64, but instead of reprogramming
the keyboards 8048, I just programmed another 8748 from scratch to take in
the (standardized) XT signals and spit out what the C-64 wanted to see.

							---Joel Kolstad