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30977Re: [midatlanticretro] Re: Ferguson BigBoard disk help needed

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  • Dave McGuire
    May 24, 2013
      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.
      > Nice!


      >> 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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