30982Re: [midatlanticretro] Re: Ferguson BigBoard disk help needed
- May 24, 2013On Sat, 25 May 2013, Dave McGuire wrote:
>That would be much appreciated if you maintain motivation.
> On 05/25/2013 12:01 AM, 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.
>> 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 pictures.
> Dave McGuire, AK4HZ
> New Kensington, PA
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