Re: very strange C64 fault

Date: Tue, 18 Apr 2017 13:20:06 +0200
Message-Id: <>
> On 2017-04-18, at 13:05, Francesco Messineo <> wrote:
> Hi all,
> I have found a real tricky fault on my C64C. I'll try to describe the
> symptoms, in case anyone is curious enough to help in troubleshooting
> it. I am not a newbie in repairing C64s, but this one made me just
> wondering without even giving me a clue on where to start probing for
> possible faults (if I had a logic analyzer I would know what to do,
> but I haven't got one).

Logic analysers may not help in some edge cases like this one.

The nouns you mention (VSP, sprites, ..) seem to be pointing towards the VIC. I'd check its voltages, frequencies and eventually swap it.

SD! -

       Message was sent through the cbm-hackers mailing list
Received on 2017-04-18 12:01:45

Archive generated by hypermail 2.2.0.