scheme for PROM IC programmer

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#1
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Any suggestion for scheme cheap programmer
Target IC are...

Quote:
* PROM - 74188, 74S287, 74S571
* EPROM - 8708, 2716

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Who still uses that ancient stuff?

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some machines which need to be repaired ;)
from this reason I need program this kind of IC memories/clone from functional to new and exchange faulty IC

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Find someone who still has a PROM programmer and ask him to help you.

The 2716 is easy, of course. I made my own programmer for those 25 years ago.

Leon Heller G1HSM

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We need have own programmer for this set of PROMs.
I am not looking for hot-fix solution I need be able read/write customize values in ICs.

We have here components and internet access but, nearest service is 7days by train+7days traveling back.
(i am sure nobody will have programmer there)

I hope now is it clear I know is obsolette IC but many programs are supported in COBOL still today becouse rewrite or buy same quality and tested solution is not possible. From same reason will be better desolder old IC program tweak new values and solder it back - but I am not able find suitable scheme.

Last Edited: Sun. Feb 20, 2011 - 07:05 PM
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You can still buy universal programmers new, devices like the GALEP-4. Or some old Data I/O programmer from eBay.

Last Edited: Sun. Feb 20, 2011 - 08:00 PM
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I happened to be looking at the Lancos Ponyprog site earlier and noticed that their programmer supports a very wide range of devices. Maybe worth a look:

http://www.lancos.com/prog.html

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I bought a prom programmer from Jameco several years ago... (ok, 10 years ago). I bet they still have a couple. Wonder if they're cheaper or more expensive than than back then?

Imagecraft compiler user

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leon_heller wrote:
Find someone who still has a PROM programmer and ask him to help you.

The 2716 is easy, of course. I made my own programmer for those 25 years ago.

It took you nine years? Bet you wished you'd waited a couple of years before starting the project, the 2732 was a much easier proposition.
:D :D

Four legs good, two legs bad, three legs stable.

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The PROMs are old bipolar metal fuse devices. You will not find a cheap programmer for those. I am surprised you can still get the parts. You can't re-use old ones as they have fuses inside so can't be erased.
Your best bet is to find a used DataIO.

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I found a perfect programmer for you. You're welcome in advance, though I have a feeling you're exactly the guy who sells it :)

Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.

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I waitted when someone will offer this only one link from google :wink:

@Mbedder if you are capable find SW+documentation for this programmer.
Also owner will be happy becouse he is missing also
I will order it :wink:

from original page
"Funkčnost jsem nemohl vyzkoušet. "
thats means - I had no option test this programmer if is still working. :)

How long will take shipping to "Омск" :)?

@fingar: old MH74xxxx are still available
I know its possible write only once but value read many times - I have one chip with original content and about 20 IC not_used/new and need clone content from working to new. if will device working we will see then benefits of old-style technology is its possible repair it its big and simple.

Will be ponyprog2000 and some interface scheme solution ?
Which one ?

probably this will help to someone with same problem.

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Since the chips are rom chips, you can just connect an AVR to read the chip contents. Perhaps some simple modifications to write too, or just use modern flash chips.

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Since reading them is easy, why not duplicate them with a small fpga and mount them on dip carrier boards?

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Since the TTL PROMs are very small, it's quite feasible to make a "programmer" with DIP switches and at most one IC to generate a pulse of the appropriate length. This is a solution I've used more than once when I had to program one or two of these chips. For the 3-supply 8708 and 2716, forget it. Use a 5V device like a 2732 with pins 19 and 21 bent out and strapped to ground. Single supply 2716s are doable with a few programmers, but even there I'd use a 2732 and just program the same data twice, high and low.