On Fri, Sep 29, 2017 at 10:20 AM, Francesco Messineo <firstname.lastname@example.org> wrote: > On Fri, Sep 29, 2017 at 7:55 AM, Francesco Messineo > <email@example.com> wrote: >> On Fri, Sep 29, 2017 at 7:05 AM, William Levak <firstname.lastname@example.org> wrote: >>> On Thu, 28 Sep 2017, Francesco Messineo wrote: >>> >>>> On Thu, Sep 28, 2017 at 12:48 PM, Francesco Messineo >>>> <email@example.com> wrote: >>>> >>>>> >> >>>> > update: changing the UD8 socket, did bring the system to the basic > prompt, with correct bytes free count. > I then restored the two CAS resistors (I had lifted them to swap RAM > banks) and now I have a completely black screen, not even the garbage > screen if I remove the UD9 ROM :( > Looks like I now have to debug the video signal path. This PET hates me I guess. another update (as I find time to look at it): pin 6 of UG11 is stuck high (that's video output) but the inputs of that gate look fine (at least they're toggling...). When I find another 30 minutes left, I'll change that 74LS20 and see what happens next. Frank Message was sent through the cbm-hackers mailing listReceived on 2017-10-02 08:00:07
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