Re: very strange C64 fault

Date: Tue, 18 Apr 2017 14:13:34 +0200
Message-Id: <>
> On 2017-04-18, at 13:56, wrote:
> From your description of a sprite "almost?" touching the bottom of the 
> screen... And the fact that it's always at the same position, so that it's 
> really repeatable points to a logic error, not a timing error.
> Maybe it's a stuck sprite collision bit, that once set is not reset and keeps 
> the interrupt low?

For one, good example.

> You could write a simple test program for that.

Or check with the scope what happens with e. g. _IRQ line when it freezes. Putting in a freezer car and checking if you get a repeatable freeze state when it happens may also help. Provided you have an AR or similar.

SD! -

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Received on 2017-04-18 13:00:27

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