30976Re: [midatlanticretro] Re: Ferguson BigBoard disk help needed
- May 24, 2013On 25 May 2013, at 00:00, "Dave McGuire" <Mcguire@...> wrote:
> On 05/24/2013 11:08 PM, Cory Smelosky wrote:
>>> Yes. Closer (but still not "close") inspection suggests that it might be a
>>> 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'm
> going to go fire it up in the lab on a bench supply and see if it generates
> some video.
> Dave McGuire, AK4HZ
> New Kensington, PA
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