Re: very strange C64 fault

Date: Tue, 18 Apr 2017 14:07:39 +0200
Message-Id: <>
> On 2017-04-18, at 13:34, Francesco Messineo <> wrote:
>> The nouns you mention (VSP, sprites, ..) seem to be pointing towards the VIC. I'd check its voltages, frequencies and eventually swap it.
> no VSP errors showed from a tool that's supposed to check for their
> existence on a C64, so yes, the VSP was mentioned and likely excluded.

I understand the demo you mention uses VSP / VIC in a specific way. That's why I say it _might_ be something about the VIC even if it shows no VSP errors.

> The crashes are very repeatable infacts, all happens every time at the
> same point of some programs.

Which is a good thing. It's always better than those esoteric ones that show only once in a cyan moon.

> I don't have any other MOS 8565 VIC-II chip to try swapping it. I only
> have old 6569s

Ruud already offered but 6569 can be made to run in place of 8565. You need to take care of the voltage it needs but for a test it should be feasible.

SD! -

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