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PICList Thread
'Where can I buy a 16C84 on a students budget?'
1996\10\08@000811 by Cameron Palmer

picon face
I just got interested in the Microchip 16C84 and want to know where to buy one
without spending two arms and a leg. I am not above buying used.

1996\10\08@073734 by Lee Johnston

picon face
> I just got interested in the Microchip 16C84 and want to know where to
buy one
> without spending two arms and a leg. I am not above buying used.

The pic 84s are not that expensive, it is the programmer that can be
expensive.  However, go to Microchip's homepage
http://www.microchip2.com/index.html  and  take a look at application note
an589. It describes how to build a programmer for a PC.  This is a low cost
solution and it is useful for students just starting with pics.

Lee Johnston
Blacksburg, VA

1996\10\08@094136 by Andy Errington

flavicon
face
>> I just got interested in the Microchip 16C84 and want to know where to
>buy one
>> without spending two arms and a leg. I am not above buying used.
>
>The pic 84s are not that expensive, it is the programmer that can be
>expensive.  However, go to Microchip's homepage
>http://www.microchip2.com/index.html  and  take a look at application
>note
>an589. It describes how to build a programmer for a PC.  This is a low
>cost
>solution and it is useful for students just starting with pics.

You can check out my PIC web page for a Windows program to download
object code into an '84 using the AN589 programmer.

Andy
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1996\10\08@162456 by dontronics

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face
Lee Johnston wrote:
>
> > I just got interested in the Microchip 16C84 and want to know where to
> buy one
> > without spending two arms and a leg. I am not above buying used.
>
> The pic 84s are not that expensive, it is the programmer that can be
> expensive.  However, go to Microchip's homepage
> http://www.microchip2.com/index.html  and  take a look at application note
> an589. It describes how to build a programmer for a PC.  This is a low cost
> solution and it is useful for students just starting with pics.
>
> Lee Johnston
> Blacksburg, VA

Or you can get the full circuits and overlays in gif format, plus
several software drivers, general 84 info, and a disassembler all for
free from:
http://www.labyrinth.net.au/~donmck/84.html

Don McKenzie .....donmckKILLspamspam@spam@labyrinth.net.au
DonTronics Tullamarine, Australia
http://www.labyrinth.net.au/~donmck

EASY PIC'n Beginners Guide to using PIC 16/17 MicroChip products.
Picosaurus(tm) 40 pin FED Basic with 8 channels of A-D, and real Uart.
MEL PicBasic Compiler. Programmers from 15 USD.  Pic-Axe(tm) A New Tool.

1996\10\09@010838 by Cameron Palmer

picon face
Sorry I left out a key word in my drowsiness. Programmer. I need the device to
program the chip. I can buy PIC16C84's for $6.50 each but I saw some
programming units going for $3000. I have since started building one from the
directions provided by Microchip. The article is on their web site, article
an589. I estimate the cost of this project under $10. Thank you to all those
that recommended it. What extra functionality am I missing out by not having
the expensive programmer?

1996\10\09@020254 by 87654321

flavicon
face
>Sorry I left out a key word in my drowsiness. Programmer. I need the device to
>program the chip. I can buy PIC16C84's for $6.50 each but I saw some
>programming units going for $3000. I have since started building one from the
>directions provided by Microchip. The article is on their web site, article
>an589. I estimate the cost of this project under $10. Thank you to all those
>that recommended it. What extra functionality am I missing out by not having
>the expensive programmer?
>
>
what u saw for 3000 dollars was not a programmer....
it was an emulator which u probably wouldn't need...it lets u doo things
such as step through your programs like a program would..but it happens in
real life...if this is life and we are not actually all living a dream...:)
sorry bout that...been reading some articles that kinda fasinated me...
go to itu's homepage...http://www.itutech.com
i got my programmer therre for 50 bucks and it works great...it won't
program any of the 5X series though..u can get a programmer from
parallax..http://www.parallaxinc.com for 99 dollars that program's all of em...
my suggestion is to buy one since i tried to build one for 2 months with no
luck....:)
cya

1996\10\09@022124 by John Payson

picon face
> Sorry I left out a key word in my drowsiness. Programmer. I need the device to
> program the chip. I can buy PIC16C84's for $6.50 each but I saw some
> programming units going for $3000. I have since started building one from the
> directions provided by Microchip. The article is on their web site, article
> an589. I estimate the cost of this project under $10. Thank you to all those
> that recommended it. What extra functionality am I missing out by not having
> the expensive programmer?

Expensive programmers generally have the following advantages over cheap
ones:

[1] Full conformance to Microchip specifications, including the use of a
   variable VDD supply.  Not too much of an issue for the '84, but very
   much an issue with UV-eraseable parts, especially if they'll be used
   in low-voltage applications.

[2] Nicer construction, typically; ZIF sockets.

[3] Ability to program a variety of parts (incl. 16C5x parts and EEPROMs)

[4] In some cases, easier ability to swap chips (e.g. not having to unplug
   power first).

[5] In some cases, the ability to program multiple chips simultaneously.

[6] In some cases, the ability to detect conditions such as incorrectly-
   inserted chips without damaging the chip in question.

[7] In some cases, easier upgrades when new chips come out (in other cases,
   much harder upgrades--why do people have to put so much #&$#$* "intel-
   ligence" into those things?

1996\10\09@043053 by Keith Dowsett

flavicon
face
>Sorry I left out a key word in my drowsiness. Programmer. I need the device to
>program the chip. I can buy PIC16C84's for $6.50 each but I saw some
>programming units going for $3000. I have since started building one from the
>directions provided by Microchip. The article is on their web site, article
>an589. I estimate the cost of this project under $10. Thank you to all those
>that recommended it. What extra functionality am I missing out by not having
>the expensive programmer?
>

Hi

  The main facility that is missing it the ability to vary the Vdd rail. If
you read the datasheets you will see a section on production programming.
For this you check the erase at Vdd(min) and programming at Vdd(max). This is to
ensure that the program can be read over the full voltage range.

For expermental use this is not important, but if you want to sell the final
product this is necessary. It's also critical if your microcontroller is
battery operated because of the supply variations.

Hope this helps,

Keith.
==========================================================
Keith Dowsett         "Variables won't; constants aren't."

E-mail: kdowsettspamKILLspamrpms.ac.uk
WWW:    http://kd.rpms.ac.uk/index.html

1996\10\10@205159 by hoss karoly

flavicon
face
Cameron Palmer wrote:
>
> Sorry I left out a key word in my drowsiness. Programmer. I need the device to
> program the chip. I can buy PIC16C84's for $6.50 each but I saw some
> programming units going for $3000. I have since started building one from the
> directions provided by Microchip. The article is on their web site, article
> an589. I estimate the cost of this project under $10. Thank you to all those
> that recommended it. What extra functionality am I missing out by not having
> the expensive programmer?
first of all I'm not a parallax employee .
I use the parallax pic16cxx-pgm programmer
it's simple,cheap,reliable and the parallax assembler is very helpful
I use it under win95 without any problem

one point more : I had to buy and develop with it in no time and with
the help
of the Source Book from Scott Edwards and the applications handbook I
managed to
finish right on deadline .
bye
charley

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