30983Re: [midatlanticretro] Re: Ferguson BigBoard disk help needed
- May 24, 2013On 05/25/2013 01:02 AM, Cory Smelosky wrote:
>>>> I've been drinking a bit, and it's getting a bit late, but I think I'mWell I've made some progress. No pics, because there's nothing much to
>>>> going to go fire it up in the lab on a bench supply and see if it
>>>> some video.
>>> Good luck!
>> Thanks! If I actually maintain motivation (it's been a long week)
>> and make
>> some progress on this tonight, I will report back, maybe with some
> That would be much appreciated if you maintain motivation.
take pictures of, because I can't get very far without a keyboard. The board
comes up and does exactly what it's supposed to do with no keyboard...which
is to generate blank video.
But, no smoke! First, I verified that the CPU is actually executing code
by looking at a few lines on the address and data buses with an oscilloscope,
and they looked good. Then I looked at the composite video output, and that
looked good too.
Perhaps tomorrow I will rig up a parallel keyboard and get to the next
step. You have to press <cr> to tell the ROM-based monitor to come up.
I seem to recall something about the BigBoard being able to be jumpered to
tell it to use one of the serial ports as the console, at least for the
monitor, but I'll have to hit the manual for that. Perhaps tomorrow.
Dave McGuire, AK4HZ
New Kensington, PA
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