> > RS232 interfacing made easy.
> >
> > What you need:
> > --------------
> >                 1. MAX232 / MAX233
>
> Anyone know of a solution like this that allows you to tri-state the RS232
> outputs?  (The +/-12V side - NOT the TTL side.)
>
> --
>             -- Paul Greenwood --  (pabloKILLspamaustin.ibm.com)
> For an idea to be fashionable is ominous, since it must afterwards be
> always old-fashioned.
>
> "His super power is to turn into a scotch terrier."
>

>
> I am reposting updated message as my mail server was down due to T-1
> upgrade.
> All response are most welcome amd encouraged!  Please RePost previous
> responses!
>
> PI>>> Telephone handset Audio into A/D converter sampling 8-bit bytes at
> PI>>> 22,050 sample rate with serial data fed to UART(16550) outputting 57,600
> PI>>> bit rate to MAX-232 RS-232 driver.
>
> PI>Why bother with 22,050 samples/second with telephone handsets?  They
> PI>were designed for a frequency range of ~300 to ~3000 Hertz.  Most of
> PI>the carbon microphones and little speakers used in handsets just don't
> PI>have the frequency response to justify this high a sample rate.
>
> PI>Telephone companies chose 8,000 8-bit samples/second to give an upper
> PI>frequency response of ~4000 Hertz (Nyquist limit).
>
> 'Scuse me for the bungled numbers.  I composed the Email from 3
> categories of calculations not interchangeable.
>
> The following is more reflective of reality:
> 57,600 baud Port * .8=46080 net data baud (less start & stop bits) /8
> (bits per byte)=
> 5760 bytes/sec  / 2 = 2880 max Nyquist frequency.
>
> I am going to try PIC 16c74 A/D sampling to its UART with BASIC and  'C'
> code.
> Does anyone know the Maximum A/D sampling and UART port speeds when
> using:
> 1> PIC or ETI BASIC
> 2> compiled 'C' code (.OBJ)
>
> ALSO, does anyone have info for intializing 16550 UART as standalone
> FIFO-serial/parallel port interface
>
>

>Dudes:
>
>As many of you know, the PICLIST was started in early 1994 by Jory
>Bell, who's been operating, maintaining, and (occasionally)
>moderating it since then.  If you subscribe to other internet mailing
>lists, you know that this one is particularly well-run; Jory's
>managed to make the list a truly valuable resource for all of us, and
>we all owe him a huge debt of gratitude.
>
>snip........................
>
>I've tried to think of everything here, especially in the area of
>assuring everyone that the PICLIST Fund will be managed honestly and
>responsibly, but if you think I've omitted anything or if you have
>any other suggestions, please feel free to tell me in private e-mail.
>
>Remember:  Donations are COMPLETELY VOLUNTARY.
>
>-Andy
>
>Andrew Warren - fastfwdspamix.netcom.com
>Fast Forward Engineering, Vista, California
>http://www.geocities.com/SiliconValley/2499
>

>> >Maybe it's just me, but in all the years I've been on the Internet (and
>> >ARPANET before that), I've never encountered having to collect funds to
>> >help support a mailing list.  The whole fund drive just seems sort of
>> >alien to me in this venue.
>>
>>         Times change.
>>
>>         The venue is no longer academics using University infra-
>>         structure.
>
>Yeah, and the two lists I run now are on my own machine, so what's
>the point?  It's not as if a University if required to host a
>mailing list.  This stuff is far from rocket science these days.
>
>> >I run a few mailing lists for some topics that I'm involved in, and the
>> >expense is not the problem - it's finding the time to do a good job.  I
>> >know that in my case, at least, money wouldn't fix that problem.
>>
>>         The problem is the inadequacy of the hardware platform
>>         currently being used to host the list (ref AndyW and Jory).
>
>If I'm not mistaken, the mailing list is hosted on an IBM mainframe.  It's
>just not clear to me what role Jory's machine plays in a simply automated
>mailing list facility, and why it's on the critical path.
>
>I understand that the administrators of the host may be unwilling to
>continue to host the list, but I was surprised that the perceived solution
>was to take up a collection rather than simply ask if anyone else was
>willing to host the mailing list.
>
>>         A solution is desired that doesn't involve reciprocal
>>         favours (ie no politics).
>>
>>         Self-sufficiency is proposed.
>
>I would think that someone in the community might be willing to host
>the list - that's self-sufficiency.
>
>Again, it strikes me as unusal that the solution is to take up a collection;
>that's never happened in any of the discussion groups/mailing lists I've
>been involved with in the past.  Usually if the list loses it's "home", a
>simple query to the community/membership of the list usually brought
>multiple offers out of the woodwork.
>
>Perhaps things have changed.  I'll just go away now.
>
>Louis Mamakos
>
>

> >>  between Gnd and a voltage higher than Vcc.
>
> >Woah boy.  Just remember that you are not talking about a ULN2003 relay
> driver here.  The PIC16C/F84(A) could be inadvertently be put into
> Probramming mode if you pull the _MCLR pin too high (especially
> when Vcc is low)  If you must have a 6V open collector output
> from say a set of batteries and you know that you chip will
> reset correctly (open collector reset IC connected to _MCLR then
> you can probably get away with it even if you put a low drop regulator
> onto the rest of the IC and run it at 5V.
>
> >If you want open collector at above supply voltage then put in the
> transistor and resistor and feel safe.
>
> >Cheers
> >Kalle Pihlajasaari     spamBeGonekalledata.co.za
>
> What are you talking about? We are discussing RA4 here, not _MCLR...

>
> Matthew Mucker <TakeThisOuTmmuckerRemoveME@spam@AIRMAIL.NET> wrote:
> >>From your responses, I was able to locate devices from three manufacturers
> >that all seem to fit the requirements.  The manufacturers are Atmel, Xicor,
> >and Microchip.  I found the results of my search quite amusing in one
> >sense-- all three vendors make essentially the same chip!
>
>    Caution!  In a couple of cases where I designed in a Microchip part,
>    a Xicor part would not function in the same socket with the same
>    software.  At the time I was in crunch mode and didn't have the time
>    to figure out why.  A quick scan of the data books did not point out
>    any obvious differences.  I had a chat with a Microchip technical
>    person on this and he agreed there was a difference but couldn't
>    remember what it was.
>
>    Perhaps someone has persued this in more detail and could post his/her
>    findings.
>
> --
> Bob Fehrenbach    Wauwatosa, WI     EraseMEbfehrenbRemoveMEexecpc.com

>----------
>From:  Matthew Mucker[SMTP:EraseMEmmucker@spam@@spam@AIRMAIL.NET]
>Sent:  Tuesday, November 19, 1996 1:10 PM
>To:    Multiple recipients of list PICLIST
>Subject:       PCB's-- revisited

>(snip)
>The article is on page 80 of the August/September 1992 issue (issue #28).
>The article is by Jeff Bachiochi and is about a product called the Toner
>Transfer System by DynaArt Designs.  It is a paper that is specially coated
>to allow easier direct-toner transfers of artwork to PCBs.  The way it
>works is that you print out your artwork and iron it on to the PCB, as in
>other designs, but then, and this is the secret, you put the board, still
>attached to the paper, in a tray of water.  The water dissolves the
>"special sauce" that lies between the toner and the paper.  Like a decal,
>the paper lifts off, leaving the toner on the board.
>(snip)
>

>    WE HAVE A WINNER!
>    -----------------
>
>    To recap, the challenge was:
>
>    File-register REG contains a number between 0 and 127, inclusive.
>    The W-register contains a number between 0 and 127, inclusive.
>
>    Write the most efficient PIC16C54 program that you can, using as
>    few additional file registers as possible, to calculate:
>
>        (REG xor W) + 2 * (REG and W)
>
>Keith Dowsett <PICLISTSTOPspamMITVMA.MIT.EDU> wrote:
>
>> Isn't this just another way of writing REG + W.
>>
>> REG xor W adds the bits with no carry, then 2 * REG and W adds in
>> the carry!!
>
>    Absolutely correct, Keith.  The complete program to perform the
>    calculation is:
>
>        ADDWF REG
>
>    One word of code space, one instruction cycle, and no extra
>    registers required.
>
>    Thanks to everyone who played, and congratulations to Keith.
>
>    -Andy
>
>=== Andrew Warren - fastfwdSTOPspamKILLspamix.netcom.com                 ===
>=== Fast Forward Engineering - Vista, California          ===
>===                                                       ===
>=== Custodian of the PICLIST Fund -- For more info, see:  ===
>=== http://www.geocities.com/SiliconValley/2499/fund.html ===
>
>

> Hi Andy.
>
> Thanks for the reply.
>
> Re:
>
> >> 1) Will this work?
> >
> >    Yes... It'll work just fine.
> >
> >> 2) If so, can I be certain that the PIC will always work over the
> >> full temperature range, etc?
> >
> >    Yes, but only by testing it.
>
> Any idea if there's someone (_technical_) at uChip who might have some
> input on how this "tap" might affect the PIC over its specified temp range,
> etc. My facilities for testing this configuration will never approach what
> uChip has, so I figured there might be someone who has considered
> "parasitic" effects on the Oscillator as I described over the specified
> temperature ranges.
>
>  ___________________________________________
> | Andrew E. Kalman, Ph.D.   spam_OUTaekTakeThisOuTEraseMEnetcom.com  |
> |        standard disclaimers apply         |
> |___________________________________________|
>

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>

>I tried unsuccessfully to upgrade my Picstart Plus yesterday.
>
>Every time I start the Picstart Plus from MPLAB 3.22.00 I get a message box
>that states there is a firmware upgrade. I ordered a PIC17C44-25/P and
>followed the instructions in readme.pls EXACTLY. When I plug the new chip
>into the Picstart Plus and apply power, sometimes the power light and Active
>light come on and remain lit other times the lights come on and fade out
>simultaneously. In either case MPLAB can't find the Picstart Plus. I can
>plug in the old chip and it works.
>
>When I programmed the chip the following settings were used:
>file - PSF12000.HEX
>Device - PIC17C44
>Oscillator - EC
>Watchdog Timer - x1
>Processor Mode - Microprocessor
>
>The device verifies OK! What have I done wrong? Next time I think I'll buy
>the windowed version.
>
>- -Mark
>
>

>
> At 03:29 PM 4/14/97 +0200, you wrote:
>
> >On the PIC16C84, does anybody knows if porta.4 needs a pull-up
> >resistor, because I can't use this anymore as output, it remains at 0v.
>
> Yes, this port is open-drain, and needs a pull-up resistor.  Check out page
> 9 of the '84 manual.  Also, this pin has a Schmitt trigger when used as an
> input; the others in port a are TTL type (no hysteresis).
>
> -Todd
>
>    .--------------------------------------------------------------.
>   /  .-.            E-Lab Digital Engineering, Inc.           .-.  \
>  |  /   \   Embedded Control & Integrated Circuit Solutions  /   \  |
>  |  \_.  |                                                  |    /  |
>  |\   | /|      http://www.netins.net/showcase/elab         |\  |  /|
>  | `---' |                                                  | `---' |
>  |       |      NEW: EDE700 Serial LCD Screen Driver        |       |
>  |       |   & EDE1400 Serial to Parallel-Printer Driver    |       |
>  |       |     (712) 944-5344      FAX:(712) 944-5501       |       |
>  |       |--------------------------------------------------|       |
>   \     /                                                    \_____/
>    `---'

>Return-Path: <TakeThisOuTJURRAMspam_OUTtorrington.com>
>Date: Mon, 14 Apr 1997 08:40:28 -0400
>From: Mark Jurras <RemoveMEJURRAMspamSTOPspamtorrington.com>
>To: .....mykeEraseMEPASSPORT.CA
>Subject: Re: Upgrading the Picstart Plus--HELP!
>Content-Disposition: inline
>X-UIDL: 1640f087fcd6a5b121e73048ed0c5456
>
>Myke,
>
>Nope, like I stated I followed the readme.pls files instructions. I didn't
>mess with the configuration bits.
>
>Has anyone successfully upgraded their Picstart Plus? Could you tell me the
>proper configuration bits and method? I sure would hate to keep
>experimenting with OTP parts. The Windowed parts are on Back order.
>
>- -Mark
>
>>>>>From:    myke predko <spamBeGonemykeRemoveMEPASSPORT.CA>
>Mark,
>
>Most likely you tried to set the configuration fuses to what *you* thought
>was correct.  The required values don't make a lot of sense.
>
>Try it again, but this time don't touch the configuration file information -
>let that get picked up out of the .HEX file.
>
>Good Luck!
>
>myke
>>I tried unsuccessfully to upgrade my Picstart Plus yesterday.
>>
>>Every time I start the Picstart Plus from MPLAB 3.22.00 I get a message box
>>that states there is a firmware upgrade. I ordered a PIC17C44-25/P and
>>followed the instructions in readme.pls EXACTLY. When I plug the new chip
>>into the Picstart Plus and apply power, sometimes the power light and
>Active
>>light come on and remain lit other times the lights come on and fade out
>>simultaneously. In either case MPLAB can't find the Picstart Plus. I can
>>plug in the old chip and it works.
>>
>>When I programmed the chip the following settings were used:
>>file - PSF12000.HEX
>>Device - PIC17C44
>>Oscillator - EC
>>Watchdog Timer - x1
>>Processor Mode - Microprocessor
>>
>>The device verifies OK! What have I done wrong? Next time I think I'll buy
>>the windowed version.
>>
>>- -Mark
>>
>>
>
>
>