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30976Re: [midatlanticretro] Re: Ferguson BigBoard disk help needed

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  • Cory Smelosky
    May 24, 2013
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      On 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.

      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!

      >
      > -Dave
      >
      > --
      > Dave McGuire, AK4HZ
      > New Kensington, PA
      >
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