Re: madison zram (cpmaker)

From: didier derny <>
Date: Sat, 3 Jun 2017 21:48:18 +0200
Message-ID: <>
Thanks for the information, it confirm what I thought  (a prom seemed 
logical but no way to decode the reference)

I'm trying to make an excel with a list of component U1 .. U49

I can deduce many component but I still have 6 or 7 hole and 1 or 2 nor 

a high quality photo would help, but I only found something quite small 
where refrences are unreadable

on my photo (from Mike website), U36 is empty   (74LS74 on the schematics)

and I can't find U1 on the schematics...

On 03/06/2017 21:37, Francesco Messineo wrote:
> On Sat, Jun 3, 2017 at 1:57 PM, didier derny <> wrote:
>> Hi,
>> I was checking the schematics / manual to understand how it worked..
>> some chip references are hard to read, (blurred on the schematics)
>> any idea if it exist a list of component somewhere
>> many can be guessed... more difficult from some others...
>> for example  U34   any idea ?
>> it's used for the mapping...
> it's an 82S131 TTL PROM (or equivalent).
> If we want to make a replica, someone with an original board needs to
> dump this prom content.
> Frank IZ8DWF
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Received on 2017-06-03 20:01:58

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