RE: PLA replacement for C64

From: didier derny <>
Date: Wed, 29 Apr 2015 23:07:57 +0200
Message-ID: <000001d082c0$9248ca40$b6da5ec0$@org>
Some other tests....

Phi0 looks ok,  phi2 look strange not really square, slow rising edge
No CS on  vic2 / 6526 / roms
No ras/cas on drams

Not yet tested a new PLA, but my next target is the 6510 itself  (r/w stuck
to read)

One strange things in my tests, with a power cartridge
I got the power cartridge screen garbaged but possible to recognize the


-----Message d'origine-----
De :
[] De la part de
Envoyé : mercredi 29 avril 2015 18:41
À :
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.


       Message was sent through the cbm-hackers mailing list

       Message was sent through the cbm-hackers mailing list
Received on 2015-04-29 22:00:05

Archive generated by hypermail 2.2.0.