30977Re: [midatlanticretro] Re: Ferguson BigBoard disk help needed
- May 24, 2013On 05/25/2013 12:01 AM, Cory Smelosky wrote:
>>>> Yes. Closer (but still not "close") inspection suggests that it might be aYep!
>>>> clock speed mod. Further supporting this guess is that all the Z80-family
>>>> components on the board are the Z80B variants, 6MHz. That'd be a pretty
>>>> expensive pointless upgrade for a board clocked at 2.5MHz! I suspect (from
>>>> the clock crystal still being 20MHz) that it's a 5MHz modification.
>>> Ahhh. That does seem like a fairly pointless upgrade...
>>> How much memory?
>> 64KB, four rows of 4116s. Full-up and pretty swank for a Z80.
>> I've been drinking a bit, and it's getting a bit late, but I think I'mThanks! If I actually maintain motivation (it's been a long week) and make
>> going to go fire it up in the lab on a bench supply and see if it generates
>> some video.
> Good luck!
some progress on this tonight, I will report back, maybe with some pictures.
Dave McGuire, AK4HZ
New Kensington, PA
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