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'[PIC]: Ideal COM Port Programmer'
2000\11\18@065433 by Bala Chandar

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I am a recent entrant into the exciting PIC world.

Can someone suggest to me a simple and reliable COM port programmer that
will work with my Pentium PC (P III 450MHz). I would like to build this
myself and hence would need the schematic and the software.

I recently tried the extremely simple "Quick and Dirty Programmer" which I
saw in http://www.elproducts.com. This uses the parallel port and works fine but it
cannot read the PIC and needs a separate power supply.

Are there any specific advantages in using parallel port programmers as
opposed to the serial port ones?

Thanks for helpful replies.

Regards,
Bala

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2000\11\20@012907 by Bala Chandar

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> Are there any specific advantages in using parallel port programmers as
> opposed to the serial port ones?

Tony Nixon wrote:
You may get a slight increase in speed. The serial port can keep up
because there is still a finite time needed to program each location in
the PIC ROM.

Thanks for the info.

I prefer the serial port programmer mainly because it doesn't require a
separate power supply. If the only drawback is that it is slightly slower, I
certainly don't mind it.

I tried the COM84 serial programmer. It doesn't work on my PC. I understand
that the programming voltage required (13 to 14V) by the PIC may not be
available in the RS232 ports of modern Pentium PCs. If this is true, is
there a way of solving the problem by altering the design of the serial port
programmer? Are such designs available for download?

Thanks.

Regards,
Bala

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2000\11\20@013737 by Bala Chandar

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Thanks a lot for the schematic.  I will this build this programmer and use
it with PIX 1.13b which I already have.

Are you using this programmer with a Pentium PC?

Regards,
Bala

{Original Message removed}

2000\11\21@055313 by Arthur Brown

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See the following link

http://www.covingtoninnovations.com/noppp/index.html

also a link to windows program that alows you to read / write via Printer
port.

Regards Art

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2000\11\28@032928 by Bala Chandar

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part 1 1291 bytes content-type:text/plain;Thanks Anand, for your reply.

The circuit you sent seemed so simple and tempting that the same day I
constructed it on a breadboard and tested it with two PCs (Pentium 100MHz &
Pentium III 450MHz). Unfortunately, it did not work.

I found one more circuit by the same author (JDM)  with a few more
components. That is working fine with the PIX program for programming my
16F84A PICs. It's quite fast too. Attached is the gif file . You obviously
don't need it, but might be curious! Secondly, it may be useful to those
looking for a serial port programmer. Using a 1W  5.1V  Zener and 400mW  12V
Zener seems to produce the correct voltages.

Regards,
Bala
Mumbai, India

{Original Message removed}
part 2 4632 bytes content-type:image/gif; (decode)


part 3 154 bytes
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2000\11\28@233651 by Bala Chandar

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> -----Original Message-----
> From: Anand Dhuru [.....ardhuruKILLspamspam@spam@vsnl.com]
> Sent: Tuesday, November 28, 2000 1:51 PM
> To: Bala.ChandarspamKILLspamaventis.com
> Subject: Re: [PIC]: Ideal COM Port Programmer
>
> Bala, I'm surprised my version didnt work, but I'm glad the
> other, slightly more elaborate one did.

My apologies! Your circuit is working absolutely fine!! Without doing a
thorough check, I reported that the circuit was not working.

The problem was that, while trying to check an old internal modem (non-PnP
type), I had disabled certain COM ports in the BIOS of my PCs. Later, I
enabled them and tried the other circuit.

I have one question. While checking the programming voltage on pin 4 of
16F84, I found that your circuit produced 14.6V while it was about 13.4V in
the case of the other circuit. As per Microchip's datasheet, the Vpp should
be 12V to 14V. Is it okay to repeatedly use a circuit that delivers higher
than the recommended voltage for programming? Or is it still within safe
limits, considering that the programming voltage is internally generated in
16F84?


Regards,
Bala

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2000\11\29@002726 by Tony Nixon

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Bala Chandar wrote:

> I have one question. While checking the programming voltage on pin 4 of
> 16F84, I found that your circuit produced 14.6V while it was about 13.4V in
> the case of the other circuit. As per Microchip's datasheet, the Vpp should
> be 12V to 14V. Is it okay to repeatedly use a circuit that delivers higher
> than the recommended voltage for programming? Or is it still within safe
> limits, considering that the programming voltage is internally generated in
> 16F84?

The absolute maximum ratings lists 14V, so I don't think I would go
above that.


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Best regards

Tony

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