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Thread: FreHD on Model II/12/16/16B/6000 - FIRST ATTEMPT

  1. #21
    Join Date
    Sep 2011
    Location
    Melbourne, Australia
    Posts
    960

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    Gentlemen,

    The aim here is to see who can get a modern digital storage device working on these machines... I am most familiar with FreHD so that is why I look at the problem from that angle, however I have much respect for Hans01's work with the Cheapo-IDE and if that is the best angle for him to work from then I encourage him in his work. Its very possible that if Cheapo-IDE can be made to work, the solution will be a lot less expensive than a FreHD solution.

    Hans if you need anything from me to get started, let me know.

    @lowen, that's great to hear about the HDINTRQ, let me run it by Fred and Andrew.

    Cheers,

    Ian.
    *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

  2. #22
    Join Date
    Jan 2014
    Location
    Western North Carolina, USA
    Posts
    1,060

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    Quote Originally Posted by TRS-Ian View Post
    Gentlemen,

    The aim here is to see who can get a modern digital storage device working on these machines... I am most familiar with FreHD so that is why I look at the problem from that angle, however I have much respect for Hans01's work with the Cheapo-IDE and if that is the best angle for him to work from then I encourage him in his work. Its very possible that if Cheapo-IDE can be made to work, the solution will be a lot less expensive than a FreHD solution....
    There is an INTRQ line in the ATA standard; I would have to wonder if the semantics of that IRQ are similar enough to work. Does the Cheap-O board provide continuity of the IRQ? (I'll look myself in a bit.....)
    --
    Bughlt: Sckmud
    Shut her down Scotty, she's sucking mud again!

  3. #23
    Join Date
    Sep 2011
    Location
    Melbourne, Australia
    Posts
    960

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    Just noticed something on the Type 2 HDC which may be important, there are heaps of jumpers on the board...

    type2hdc.jpg

    Can anyone provide a description of what they all do and why?

    Cheers,

    Ian.
    *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

  4. #24
    Join Date
    Jan 2014
    Location
    Western North Carolina, USA
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    1,060

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    Quote Originally Posted by TRS-Ian View Post
    ...
    Can anyone provide a description of what they all do and why?
    .
    We would need the service manual with the schematic to know what all of those are. I don't recall if I ever had that manual; Kelly might.
    --
    Bughlt: Sckmud
    Shut her down Scotty, she's sucking mud again!

  5. #25
    Join Date
    Feb 2014
    Location
    Netherlands
    Posts
    408

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    Quote Originally Posted by TRS-Ian View Post
    Gentlemen,

    The aim here is to see who can get a modern digital storage device working on these machines... I am most familiar with FreHD so that is why I look at the problem from that angle, however I have much respect for Hans01's work with the Cheapo-IDE and if that is the best angle for him to work from then I encourage him in his work. Its very possible that if Cheapo-IDE can be made to work, the solution will be a lot less expensive than a FreHD solution.

    Hans if you need anything from me to get started, let me know.

    Ian.
    @Ian.

    I hope we both succeed in finding a way to connect a modern harddisk solution to a Model II series computer.
    It would give the serious user a professional solution for a professional price or a hobby collector a interchangeable
    solution with some or more restrictions.

    For the moment I need a double sided prototype board with a Model II bus connector.
    I'am afraid that this not exist, but you know so much about TRS 80, I hope you can point me in the right direction.
    Or maybe you can help me with a destroyed and useless model II board where I can cut off the edge connector and some traces.

  6. #26

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    Quote Originally Posted by TRS-Ian View Post
    Just noticed something on the Type 2 HDC which may be important, there are heaps of jumpers on the board...

    Can anyone provide a description of what they all do and why?
    They're pretty simple. They set the RAM address and the port address. Pulls up input of U26 and U1.
    From notejump.pdf page 221 and 222

    Model II/16/16B/6000
    ModelII-6000.PNG

    Model II/16/16B/6000
    Model12.jpg

  7. #27

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    Quote Originally Posted by Hans01 View Post
    For the moment I need a double sided prototype board with a Model II bus connector.
    I'm afraid that this not exist, but you know so much about TRS 80,
    What about a quick layout for one of the inexpensive FAB houses like OSHPark.COM? I bet we could get NF6X to lay it out for us. I'd buy a couple to play with.

  8. #28

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    Quote Originally Posted by kb2syd View Post
    What about a quick layout for one of the inexpensive FAB houses like OSHPark.COM? I bet we could get NF6X to lay it out for us. I'd buy a couple to play with.
    A full-sized Model II/12/16/6000 card is 10" x 5.5". That would cost $91 each at OSH Park in the 2-layer standard run (must order multiples of 3 boards). It could be dropped to $55 each using their 2-layer medium run (must order multiples of 10 boards, and not web-orderable).

  9. #29

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    Quote Originally Posted by NF6X View Post
    A full-sized Model II/12/16/6000 card is 10" x 5.5". That would cost $91 each at OSH Park in the 2-layer standard run (must order multiples of 3 boards). It could be dropped to $55 each using their 2-layer medium run (must order multiples of 10 boards, and not web-orderable).
    What about just fingers and 80 plated through holes? Say 10" x 1.5" just so we can prototype some stuff. Or even smaller, like just the board edge and enough to insert and remove.

    Personally, I'd be good with $91.

  10. #30

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    That would drop the price quite a bit. It would then cost $25 per board (must order multiples of 3) in standard run, or $15 each (must order multiples of 10) in the medium run.

    Note well: Those are the raw board prices if you order directly from OSH Park, and you would need to order 3 or 10 boards at a time to get those prices. If I was to quit my day job and sell these boards, then multiply everything by 2.5 and add shipping. And I'll need y'all to order 8,000-10,000 boards per year so I can quit my day job.

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