Re: very strange C64 fault

From: silverdr_at_wfmh.org.pl
Date: Tue, 18 Apr 2017 14:13:34 +0200
Message-Id: <C64FC2AA-A6EE-4A7C-9542-82E65E2B1D87@wfmh.org.pl>
> On 2017-04-18, at 13:56, afachat@gmx.de 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! - http://e4aws.silverdr.com/


       Message was sent through the cbm-hackers mailing list
Received on 2017-04-18 13:00:27

Archive generated by hypermail 2.2.0.