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 confirmed.. 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 <firstname.lastname@example.org> 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 > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2017-06-03 20:01:58
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