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Thread: Dec RK8E controller for RK05 wanted

  1. #11

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    Quote Originally Posted by Roland Huisman View Post
    It seems Bitdefender is the only one which gives an error there:
    https://www.virustotal.com/nl/url/30...is/1526753277/

    So probably a false positive...
    I'm pretty sure that's a false positive. There should be no javascript or executable code of any kind on any of my web pages. (There is some server side scripting, but what gets to you should be pure HTML.)

    Vince

  2. #12

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    In the meanwhile my RK05 arrived
    Including a disk pack and a spare set of heads.

    RK05.jpg

    I can't wait to restore it, but I don't have a RK8E controller yet...

    For now I have to put it in the rack and wait if there is
    any controller for me coming by. So if anyone has a
    controller for sale, please let me know. No problem if it is
    a defective one.

    Thanks in advance!
    Regards, Roland
    WTB: RX8E / M8357 and Case for Altair 8800

  3. #13

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    There are a lot of drive diagnostics that you can do without a controller.
    It would be good to know that the drive will go ready and do seeks before you get a controller.

    Don't forget that you need a terminator board to go in the last RK05 on the controller cable.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  4. #14
    Join Date
    Sep 2006
    Location
    Silicon Valley
    Posts
    1,565

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    Quote Originally Posted by m_thompson View Post
    There are a lot of drive diagnostics that you can do without a controller.
    It would be good to know that the drive will go ready and do seeks before you get a controller.

    Don't forget that you need a terminator board to go in the last RK05 on the controller cable.
    You should also get started making the impossible to find 40 pin to DEC paddle card PCB that goes into the first drive in the chain.

    I guess the need has been low enough that no one has made an RK05 drive exerciser.

  5. #15

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    Quote Originally Posted by Al Kossow View Post
    I guess the need has been low enough that no one has made an RK05 drive exerciser.
    Obviously DEC made one once upon a time, but I guess that it wasn't what you had in mind. I have RK05 tester, but haven't tested it yet. Making a modern one is mostly using ones favorite micro controller and a bunch of OC drivers. I have been contemplating doing an USB interface for a RK05 but that would be a much later project...

  6. #16

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    Quote Originally Posted by Al Kossow View Post
    You should also get started making the impossible to find 40 pin to DEC paddle card PCB that goes into the first drive in the chain.
    I have Eagle drawings for a version of the M993 on my site:
    http://svn.so-much-stuff.com/svn/tru...DEC/Mxxx/M993/

    I guess the need has been low enough that no one has made an RK05 drive exerciser.
    I also have a few versions of the drive exerciser:
    http://svn.so-much-stuff.com/svn/tru...5%20Exerciser/

    I even ordered boards at one point (though I never got ambitious enough to build or debug them.)

    I suspect Mattis is correct that it would be easier these days to just use a
    micro controller.

    Vince

  7. #17
    Join Date
    Sep 2006
    Location
    Silicon Valley
    Posts
    1,565

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    Quote Originally Posted by vrs42 View Post
    I suspect Mattis is correct that it would be easier these days to just use a
    micro controller.

    Vince
    some related work was done by Carl Claunch for the Diablo 31

    http://rescue1130.blogspot.com/2017/...ard-fully.html
    and earlier posts

    the main thing of interest was the drive requirements on the interface are pretty high

  8. #18

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    Quote Originally Posted by Roland Huisman View Post
    So if anyone has a
    controller for sale, please let me know. No problem if it is
    a defective one.
    You may have already seen this. Pricey Plessy version though best offer available.

    https://www.ebay.com/sch/i.html?_fro...lessy&_sacat=0

    Schematics here
    http://www.pdp8online.com/pdp8cgi/qu...view.pl?id=551

  9. #19

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    So, I'm back from holiday now. What a list of interesting postings!

    Quote Originally Posted by m_thompson View Post
    There are a lot of drive diagnostics
    that you can do without a controller. It would be good to know that the
    drive will go ready and do seeks before you get a controller.
    I agree. And there is a lot to do before the drive can be powered up.

    Quote Originally Posted by m_thompson View Post
    Don't forget that you need a terminator
    board to go in the last RK05 on the controller cable.
    Yes, the previous owner told me that he didn't have that terminator.
    But that board looks quite simple to redesign. Good pictures and some
    sizes would help me to design it as accurate as possible. In this way others
    can use it too if they want. (DEC H851 PCB is also available)

    Quote Originally Posted by Al Kossow View Post
    You should also get started making the impossible to
    find 40 pin to DEC paddle card PCB that goes into the first drive in the chain.
    Good point! Without the documentation I was already wondering how that white
    flat cable was connected to the controller. But it isn't... It seems Vince did some nice
    work here. I'll be glad to use his drawings.

    Quote Originally Posted by vrs42 View Post
    I have Eagle drawings for a version of the M993 on my site:
    http://svn.so-much-stuff.com/svn/tru...DEC/Mxxx/M993/
    Great, this saves a lot of work I will double check it of course... Thanks!

    Quote Originally Posted by Al Kossow View Post
    some related work was done by Carl Claunch for the Diablo 31
    http://rescue1130.blogspot.com/2017/...ard-fully.html
    and earlier posts the main thing of interest was the drive requirements on the interface are pretty high
    Thanks for pointing me there. I will check if there is any documentation available.

    Quote Originally Posted by djg View Post
    You may have already seen this. Pricey Plessy version though best offer available.
    https://www.ebay.com/sch/i.html?_fro...lessy&_sacat=0
    Schematics here http://www.pdp8online.com/pdp8cgi/qu...view.pl?id=551
    And thank you very much! I didn't see that one. In fact, I went for a short holiday after getting the drive.
    With only a tablet there I've contacted the seller and made an offer for all three boards. I've no idea
    why he offered these boards separately. They are useless if you don't have them together.

    But the seller agreed to my offer and they are on their way to me

    According your title djg I guess you are David Gesswein? Thanks a lot for bringing the
    clone schematics to the collectors. That must have been a lot of work.
    In my opinion the clone board would be easier to get running again because of
    the more standard TTL components than the RK8E board has...

    I thought the top connectors would be the H851 as well for these boards.
    But Plessey seems to have a top inter connect board. Do you know it this is 1:1?
    It looks like the H851 fits on it as well...

    interconnect board.jpg

    Thanks! Roland

    To be continued...
    WTB: RX8E / M8357 and Case for Altair 8800

  10. #20

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    Quote Originally Posted by Roland Huisman View Post

    According your title djg I guess you are David Gesswein? Thanks a lot for bringing the
    clone schematics to the collectors. That must have been a lot of work.
    Correct on name. I just linked to the documentation, I didn't do any of the work and I don't have that board set. I do have the DEC version.


    Quote Originally Posted by Roland Huisman View Post
    I thought the top connectors would be the H851 as well for these boards.
    But Plessey seems to have a top inter connect board. Do you know it this is 1:1?
    It looks like the H851 fits on it as well...
    Picture of the board here. Since they seem to be clones I would think H851 will work fine but don't have first hand experience. There is a contact link on the site. You can also check if the signals line up on the schematics.
    http://pdp8.de/en/frames/set_rk05.html

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