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'[PIC} Can the PicStart+ read/program a 1702 EEPRO'
2002\08\03@195116 by Brooke Clarke

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Hello:

I have an AN/PSN-6 Loran-C receiver that has a couple of 1702 EEPROMs in it the
tell the receiver that it should look for Loran-C chains in the area of Fort
Bragg, NC.  I would like to reverse engineer the contents of these 1702 chips so
that I can reprogram them for central CA.
http://www.pacificsites.com/~brooke/PSN6.shtml

Can I read and/or program the 1702 with the PicStart+?

If not what's needed?

Thanks,

Brooke Clarke, N6GCE
http://www.prc68.com

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2002\08\03@220519 by Rick C.

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I seriously doubt it. Needhams has the best an low cost eprom reader/programmer.
http://www.needhams.com
I have such a device. Send me the chips (contact me off list) and I can email you
back the files in .hex or .bin or find someone locally that can do it.
Rick - N3HXT

Brooke Clarke wrote:

{Quote hidden}

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2002\08\03@220527 by Spehro Pefhany

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At 04:23 PM 8/3/02 -0700, you wrote:

No, the 1702 is an ANCIENT (ca. 1970) 3-supply (+/-5V, 12V, not including Vpp,
48V or something like that) 256 x 8 p-MOS EPROM, not an EEPROM.

Some current universal programmers may be able to work with
them, but if you can't find one of those, maybe someone has an antique
one around.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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2002\08\04@031327 by Russell McMahon

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From: "Brooke Clarke" <brookespamspam_OUTPACIFIC.NET>

> Can I read and/or program the 1702 with the PicStart+?

NO!

The 1702 is an extremely old EPROM of early 1970s vintage. It requires 3
power supplies for programming and has about the most arcane programming
algorithm that you can imagine. Involves raising and lowering various
voltages in an interesting manner, meeting setup times etc. You definitely
require a specialist programmer to handle it. AFAIR the spec also called for
data to be applied inverted and then inverted for a certain peiod of time
and then re-inverted to the correct value a certain time before programming.
Also, AFAIR the friend mentioned below friend found that you could ignore
this requirement :-).

I have copied this message to a friend who built a 1702 programmer in about
1974 when the 1702 was about all that was available. I suspect he can't add
a lot to the above but he may care to comment to you directly.

You could search for a programmer able to handle 1702's (Holtek amongst
others advertise them).

If I was in your position, depending on whether the cosmetic aspects were
important, I would be tempted to read the 1702's if necessary  (much easier
than programming them) and build an adaptor for a more modern EPROM. Failing
that, reading the EPROMs should be easier and you could find a specialist
service to rewrite them once you had made the alterations. .



       Russell McMahon

____________________________________________


> I have an AN/PSN-6 Loran-C receiver that has a couple of 1702 EEPROMs in
it the
> tell the receiver that it should look for Loran-C chains in the area of
Fort
> Bragg, NC.  I would like to reverse engineer the contents of these 1702
chips so
{Quote hidden}

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2002\08\04@135019 by Peter L. Peres

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On Sat, 3 Aug 2002, Spehro Pefhany wrote:

>At 04:23 PM 8/3/02 -0700, you wrote:
>
>No, the 1702 is an ANCIENT (ca. 1970) 3-supply (+/-5V, 12V, not including Vpp,
>48V or something like that) 256 x 8 p-MOS EPROM, not an EEPROM.
>
>Some current universal programmers may be able to work with
>them, but if you can't find one of those, maybe someone has an antique
>one around.

Usually one can wire two sockets and an external supply to make the
ancient EPROMs look like a 2732, which is read/written by most
programmers. An external PSU is required to supply +12 and -5V. I've done
this and it works (for 2708s).

Peter

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2002\08\05@045650 by Alan B. Pearce

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> I have an AN/PSN-6 Loran-C receiver that has a couple of 1702 EEPROMs in
it the
> tell the receiver that it should look for Loran-C chains in the area of
Fort
> Bragg, NC.  I would like to reverse engineer the contents of these 1702
chips so
> that I can reprogram them for central CA.

1702 EPROMS have a truly horrible programming algorithm. Once you have the
data for your new eprom's, you would be better off programming 2716 or
larger 5V only eproms with simpler programming algorithms, and making an
adapter socket to suit the small number of pinout changes.

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