Strange I put a logic analyser, on the 6510... 01 on DATA FFFF on ADDRESS No NMI, No IRQ, rdy not used r/w on read (all the time) The same signal on PHI0, PHI2 and AEC.. I expected to see the 6510 trying to execute random code... I retried during power up, apparently the 6510 is executing random data but but r/w seems to be stuck to read. The rams are cold (totally cold) other chips are warm but not very hot -- didier -----Message d'origine----- De : firstname.lastname@example.org [mailto:email@example.com] De la part de firstname.lastname@example.org Envoyé : mercredi 29 avril 2015 18:41 À : email@example.com Objet : Re: PLA replacement for C64 On 2015-04-29 17:57, Clockmeister wrote: >>>> I'm also thinking to the ram ship, but I think I would rather have >>>> a garbaged screen with a ram failure >>> >>> Not really. Only in some specific cases you get this kind of result. >>> More RAM failures I had to repair manifested itself with no startup >>> screen than with garbled content. >>> > > Sometimes the temperature of the RAM chip (or lack thereof) is a dead > giveaway especially if the problem is temperature sensitive. I've > diagnosed faulty RAM and ROM by touch alone. That's especially true with the x464 chips. If they run /burning/ hot, they're surely dead (and no startup guaranteed). It's less common with x164 but happens sometimes too. As you mentioned - either way. -- SD! Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2015-04-29 20:00:05
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