On Thu, Sep 28, 2017 at 12:48 PM, Francesco Messineo <firstname.lastname@example.org> wrote: > > it's every 8 chars. Now I first have to replace the UD9 socket (I > hope). After swapping the EPROMs a few times, the PET no longer > execute anything, so I guess it's that crappy socket. > I'll have a look at that counter after I fix the ROM problem (unless > something else died). >> turns out the "every 8 chars" flickering was a bad UF8 (MOS 2114 variant). UF7 (the twin MOS 2114) had also a few bad cells (3 that I could observe using pettester.bin image). Now for the real "funny" part: pettester.bin shows no error both on VRAM and on the system RAM, but using the original kernel EPROM on UD9 gives a garbage screen. I've tried to swap the 16K banks but no change. Looks like there're still problems. Does anyone feel like coding a much more useful test image for 2001N? :D Debugging a PET without a logic analyzer can require a "funny" amount of time. I think a good test program that can be put in the kernel socket would speed up the process. Frank IZ8DWF Message was sent through the cbm-hackers mailing listReceived on 2017-09-28 18:00:07
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