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? Nicolas Message was sent through the cbm-hackers mailing list
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