Re: option ROM into a 3032

From: Francesco Messineo <*francesco.messineo_at_gmail.com*> Date: Mon, 2 Oct 2017 09:41:16 +0200 Message-ID: <CAESs-_yXXLP+dEcir=Wx=5DagH3SYUw01aNxr2GL=nSpLrvf3g@mail.gmail.com> · francesco.messineo_at_gmail.com

On Fri, Sep 29, 2017 at 10:20 AM, Francesco Messineo
<francesco.messineo@gmail.com> wrote:
> On Fri, Sep 29, 2017 at 7:55 AM, Francesco Messineo
> <francesco.messineo@gmail.com> wrote:
>> On Fri, Sep 29, 2017 at 7:05 AM, William Levak <wlevak@sdf.org> wrote:
>>> On Thu, 28 Sep 2017, Francesco Messineo wrote:
>>>
>>>> On Thu, Sep 28, 2017 at 12:48 PM, Francesco Messineo
>>>> <francesco.messineo@gmail.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

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