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'eprom programmer'
1997\03\26@144757 by John Doe

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does anyone know where a really cheap eprom programmer can be
found....and I mean CHEAP...
I'm 17....in HighSchool...and have no job.....right now i have 1 dollar
to my name...
so 140 bucks for an eprom programmer is out of the question.....

If anyone knows where one can be found....please let me know

Thanks

spam_OUTdeicideTakeThisOuTspamfia.net

1997\03\26@145701 by Byron A Jeff

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>
> does anyone know where a really cheap eprom programmer can be
> found....and I mean CHEAP...
> I'm 17....in HighSchool...and have no job.....right now i have 1 dollar
> to my name...
> so 140 bucks for an eprom programmer is out of the question.....

This is an instance where you seem to have more time than money.
Typically to program an EPROM you need a programmable voltage source
and it's helpful to have a good timer. Lastly you need a way to get
the data from the file to the EPROM.

A PIC can help with all these tasks:

programmable voltage: Check out an article that Steve Ciarcia did for
BYTE magazine (about 10 years ago) where he built an intelligent serial
EPROM programmer. You may not want to use the whole circuit (you can)
but the LM317 based programmable voltage generator is definitely the ticket.
Presuming a high voltage power supply (17-25VDC) is available, the programmable
voltage part can be built for less than $5. The PIC can then control the
voltage.

Timer: PIC's have real good timers for the 0.1ms pulses required with most
algorithms.

Data transfer: Most any PIC can be programmed to read data from the serial
port. It is also possible to use the parallel port to transfer data.

You can put one together for maybe $20 and a lot of effort.

BAJ

1997\03\26@201332 by Mike Smith

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A lot of the PIC's have the ability to be 'in-site' programmed, with just a
few (varies with PIC) pins.  All you need, then, is a switchable Vpp, and a
couple of pins from, say, a parallel port on yr PC, and a program to
twiddle these pins.

MikeS

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1997\03\27@122405 by myke predko

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Byron,

I think I know the programmer you're talking about and it's *not*
intelligent (the smarts came out of a PC).  Control was through the PCs
Parallel Port.  I think it was published around 1984.

I built one and was *really* disappointed in it.  It never really worked
well (because it only took files in Intel format - and I was playing around
with Motorola parts at the time) and was *very* PC Dependant (this was about
the time of the PC/AT and the speeding up of the ISA bus) - It wouldn't
program properly on a PC running faster than 12 MHz (the PC's internal bus
delay was used as part of the programming requirements).  It also had a
bunch of jumpers to allow different parts (not all that intelligent at all).

This was also about the time I figured out that if Ciarcia published a
project that was only wire-wrapped (or pin-pin wired like the EPROM
programmer was) chances are it would be pretty flaky.  Anytime he presented
a design with an embedded card, it usually worked fine.  Actually, I think
he needed an EPROM programmer for a specific application and didn't want to
pay for a commercial one (and got an article out of it as well).

You could probably build an EPROM Programmer using a PIC, Variable Voltage
Supply, and a few counters.  But there are the issues of understanding:

1.  What is the host platform.
2.  What is the object file format.
3.  What is the device you want to program (and what are the programming Specs).

If you understand what you're going to be easy, it shouldn't be that hard.

Good Luck,

myke
{Quote hidden}

"Some people say that foreign cars handle best, while others say domestic.
For my money, nothing handles as well as a rental car." - P.J. O'Rourke

1997\03\27@204937 by Byron A Jeff

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>
> Byron,
>
> I think I know the programmer you're talking about and it's *not*
> intelligent (the smarts came out of a PC).  Control was through the PCs
> Parallel Port.  I think it was published around 1984.

No, that's a different one. The one I was talking about had a 8031 on board,
communicated via the serial port, and had dynamic reconfiguration. He
did have another one earlier and the intelligent serial one was an update
to it.

> You could probably build an EPROM Programmer using a PIC, Variable Voltage
> Supply, and a few counters.  But there are the issues of understanding:
>
> 1.  What is the host platform.
> 2.  What is the object file format.
> 3.  What is the device you want to program (and what are the programming
Specs).
>

That's about the sum of it. With PIC's it's fairly easy to get enough
smarts to get the job done too.

BAJ

1997\03\27@214106 by John Doe

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I don't know near as much as you guys already do about eprom programmers
and the timing etc....
So it would probably be a long while before i get something like that
done...being that i have too much homework because my teachers like
torturing seniors in High School...:)

If anyone has some free time...and eprom programmer made from a pic chip
would be really neat...and if you were able to keep the cost down....you
mught be able to sell a good kit....i would sure buy it....

one of my old electronics now has the article with the 8031 and if i get
about 40 or 50 bucks...i'll probably buy it.....

thanks for your info...

1997\03\28@015018 by Antti Lukats

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Check out LUDIFLAP

programmer, it programs ATMEL Flash, 89C52 89C2051 and Parallel EPROM's
design is free so is the programming software.

on place where to find it is elrad ftp site
ftp://ftp.heise.de/pub/elrad/

and keep searching in directories below...

this would be about 10$ programmer.

there are sure many scematics with 8031 as host, one project
from DDS, go to http://dunfield.com
and get project files archieve

antti



At 06:10 PM 27/3/97 -0800, you wrote:
{Quote hidden}

-- Silicon Studio Ltd.
-- http://www.sistudio.com


'eprom programmer'
1998\11\25@184557 by darwin
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Hi,
I'm planning to buy me an eprom programmer,
but cannot afford those expersive programmers.
any help on where to buy low cost ones.


D.R

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