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    grbrady

    Welcome. I hope your PET RAM debug odyssey is...

    Welcome. I hope your PET RAM debug odyssey is shorter than mine.

    My understanding of the two messages you get there is the same as yours for Test 0 in the PETTESTER. Hopefully the author, Dave,...

    grbrady Today, 09:48 PM Go to last post
    grbrady

    I spent some quality time with my new storage...

    I spent some quality time with my new storage scope looking at stuff and I think everything I see with respect to the RAM seems plausibly correct.

    For example, here is the refresh signal for...

    grbrady Today, 09:36 PM Go to last post
    falter

    Z80 DART used for keyboard?

    Question.. would it make design sense to use a Z80 DART has part of a keyboard input circuit? I'm trying to trace out a header to figure out what it is.. the header pins go to the inputs of a...

    falter Today, 09:28 PM Go to last post
    ajacocks

    Very much agreed. I don’t think that CF has to be...

    Very much agreed. I don’t think that CF has to be the only media type, if something else is easier, though. SD/uSD cards are definitely available rather cheaply, as are m.2 SATA SSDs. Personally, I...

    ajacocks Today, 09:24 PM Go to last post
    Chuck(G)

    The 8 sector thing on early DOS came from the...

    The 8 sector thing on early DOS came from the datasheet for the µPD765 FDC. It was overly generous with the gaps, probably on the assumption that an open-loop DC-powered belt-drive spindle motor...

    Chuck(G) Today, 09:01 PM Go to last post