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30982Re: [midatlanticretro] Re: Ferguson BigBoard disk help needed

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  • Cory Smelosky
    May 24, 2013
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      On Sat, 25 May 2013, Dave McGuire wrote:

      >
      > 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!
      >
      > Yep!
      >
      >>> 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.
      >

      That would be much appreciated if you maintain motivation.

      > -Dave
      >
      > --
      > Dave McGuire, AK4HZ
      > New Kensington, PA
      >
      >
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      --
      Cory Smelosky
      http://gewt.net/ Personal stuff
      http://gimme-sympathy.org Experiments
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