Re: 65816 module :(

From: Nicolas Welte (
Date: 2001-08-06 11:17:24

Ruud Baltissen wrote:
> - when the C64 hang up, I saw pop up lines on the screen once about every
> second at random places. These lines have the hight of one character and are
> filled with graphical nonsence but plm. 80% is white.
> With one exception, I haven't even the slightest idea were to start the
> research. The exception is removing the 6526 to see if the strange behaviour
> still happens. So any idea or comment is welcome.

Hi Ruud,

The visual errors seem to indicate that there is a bus problem with the
VIC-II chip, i.e. the CPU doesn't shut down properly when the VIC-II takes
over the bus, and then reads some crap. And with both chips driving the
address bus, it is clear that the CPU crashes. I don't know if the '816 is
able to tristate it's address lines like the 6510 does. How do you handle the
CPU shutdown?


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