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Type: Posts; User: Roland Huisman

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  1. Replies
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    DG Nova 3 front panel

    I have this nice Data General nova front panel here but I don't have any use for it. I would love
    to swap it for some Omnibus related material. But maybe someone has another idea.

    59198
    59199
    ...
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    I really like those small machines. I would love...

    I really like those small machines. I would love to find such a machine a bit closer to my home 😊
  3. Hi Jack, Thanks! What a wonderful pictures. I...

    Hi Jack,

    Thanks! What a wonderful pictures. I hope someone has clear pictures
    about how it is really attached to the PDP itself. Or maybe some sizes and
    pictures of the cabinet itself without...
  4. How about a Ritro Amicos 6800, brand new in...

    How about a Ritro Amicos 6800, brand new in original box?

    58769

    A few more pics on a Dutch forum.
    http://www.transistorforum.nl/forum/index.php?id=52221

    Regards, Roland
  5. Very nice work! Every day it is becoming easier...

    Very nice work! Every day it is becoming easier to get those old machines going again!
  6. The PDP8/L passed all maindecs! So now it is...

    The PDP8/L passed all maindecs!

    So now it is time to have some fun with the machine.
    I made a few cards to play with the bus of the machine.
    58566

    Because I'm still waiting for the...
  7. Hi Doug, this comes from the differential...

    Hi Doug, this comes from the differential amplifier which is not working
    up to a certain level of mains power voltage. When you slowly rise the mains
    voltage it just stays at 6.3V. When you raise...
  8. In the meanwhile I've built and tested my crowbar...

    In the meanwhile I've built and tested my crowbar PCB. It trips nicely on 5.8V.
    So now I've put it in de PDP8/L. I used the screw of a capacitor clamp to hold the PCB.
    Just two wires to connect the...
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    What is wrong with the H851? Contacts or pcb? I...

    What is wrong with the H851? Contacts or pcb? I had problems with these H851 too

    http://www.vcfed.org/forum/showthread.php?54312-Dec-H851-pcb-redesign

    Regards, Roland
  10. Yes odd indeed, but I think that it was braking...

    Yes odd indeed, but I think that it was braking down in earlier tests...
    That happened also with the AC increment test which you can see in the youtube film.
    The machine worked for a while and then...
  11. Hello Doug. Thanks, that is a very nice overview....

    Hello Doug. Thanks, that is a very nice overview.



    Thanks, I found this paper tape list at the site of Philipp Hachtmann.
    It seems many of them are mentioned in the list you mentioned.


    In...
  12. Thanks, that was what I'm looking for! My book is...

    Thanks, that was what I'm looking for! My book is from 1972 and seems to be different indeed.
  13. Thanks. Checked it, but that is the instruction...

    Thanks. Checked it, but that is the instruction how to operate the PDP8/E.
    (Or I have a different version of the book?)

    What I'm searching for are differences in the supported instruction set...
  14. Oops, my mistake! I was single stepping trough...

    Oops, my mistake! I was single stepping trough the program with the start knob.
    But you need to use the start knob just once and then continue with the cont knob.
    -feel a bit stupid- I guess it was...
  15. Happy new year! :D I've replaced all 512 diodes...

    Happy new year! :D I've replaced all 512 diodes on the core stack, 256 diodes on both sides.
    The replaced diode counter is now on 718... Checked all X, Y, sense and inhibit wires.
    No problems...
  16. That is the reason why I replaced all the diodes...

    That is the reason why I replaced all the diodes on the other boards if I
    found several defective ones on a single board.

    I guess I was a bit naive to think that the core stack would be...
  17. Checked it, but the STROBE FIELD 0 signal didn't...

    Checked it, but the STROBE FIELD 0 signal didn't look bad to me. (Don't mind the
    ringing on the cables) I think it is good idea to check all the timing in the machine...
    58294

    But the memory...
  18. This is what I have done with the 7460, I could...

    This is what I have done with the 7460, I could at least find one defective one in this way.
    Just pressed a good chip on top of it. The PCB did pass his tests so the 7460 underneath was broken....
  19. So I got a bit further... I've got my crowbar...

    So I got a bit further...

    I've got my crowbar PCBs so I will build and test these soon.
    58211

    The deposit switch was giving problems. There was some dried out grease in it.
    After cleaning the...
  20. Yes I did! There are gerber files online free to...

    Yes I did! There are gerber files online free to download. The text on the PCB was only for the 16 pin
    but if you have an original card (or card numbering on paper) you dan just drill the holes for...
  21. In the meanwhile I had some contact with Vince...

    In the meanwhile I had some contact with Vince about the flip chip tester.
    From the first moment that I got it running I started testing the boards.

    The first cards which I tested were a few...
  22. I found info about the Nixdorf 820. The interface...

    I found info about the Nixdorf 820. The interface from the magnetic module
    looks identical to the boards which I have here. Since there is also the number
    820 in the board numbers I guess it is...
  23. Nixdorf computer AG boards rechner 154

    Hello everyone,

    I've got these Nixdorf boards since recently.

    58110

    RAM
    Kernspeicher 820
    E160702 10101
    Chips have date codes in 1973
  24. Replies
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    Hi Dave, A few years back I've build the...

    Hi Dave,

    A few years back I've build the programmer from Martin Eberhart. Works very nice!
    57953 57954 57955 57956

    And I'm still wondering is the bus of this microkit 8/16 the same as the...
  25. In the meanwhile I've cleaned all circuit boards....

    In the meanwhile I've cleaned all circuit boards. Some chips are heavily corroded, others are shiny gold.
    I cleaned the rusty pins with a small wire brush but I expect some troubles with these...
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