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  1. #1
    Join Date
    May 2014
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    80

    Confused Cuda

    In an attempt to revive my Power Mac I've been advised to reset the CUDA switch in my PowerMac 8500 with a Sonnet G4 card installed several years ago..

    What's CUDA?

    How do I reset this switch. Is it like a light switch i flip up to turn on or flip down to switch off ?

    Any special or extra advice about resetting and the after affects of such action.


    OK guys please stop laughing MR MAGOO is very new to try this DIY computer repairs.

  2. #2
    Join Date
    Jan 2002
    Location
    NW Montana
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    8,197

    Default Welcome to the Guru's forums

    The CUDA will be a small button that you press - it will be on the motherboard. It's been so long since I've seen the inside I'm not sure an an 8500.

    Here is an Apple Document it talks about CUDA reset.

    Also right here is a discussion of how to get to it. It's tough I think on these.

    There should be some good info buried on the MacGuru's forums in the Vintage area. I'll search it some and post any relevant information.

    All of the Threads here will have talk of the CUDA look for an 8500. Right here might have an 8500.

    Here is a Google search with many topics re 8500's and PCI PPC's of that generation.

    Good luck, post back any questions. Attached is a drawing of an 8500 mobo the CUDA is in bottom left corner a square looking button.

  3. #3
    Join Date
    May 2014
    Posts
    80

    Default

    Many thanks. Very helpful. With your information found the CUDA switch and actually it's not that difficult to get to it. You don't have to take the mother board off.

    1. Lower the processor card retainer by squeezing together the two holding clamps to release the retainer and lower it away from the logic board.

    2. Lay the computer on its side so that may gain access to the interior of the computer.

    3. Remove the current processor card from the Processor Card Slot.

    4. The CUDA switch is located directly inline with Processor Card Slot. In my 8500 the switch is an orange colour. I used the rubber end of a pencil to press on that switch. I could not hear or feel any movement. Assumed i had reset it.

    5. Reinstall the processor card.

    6. Move the processor card retainer back into place: it snaps into place.

    7. Replace the case cover and tighten the four security screws.



    It's not all that difficult once you understand where it is and how to easily get at it.

  4. #4
    Join Date
    Jan 2002
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    NW Montana
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    Question

    Did it help the situation?

    If not what's happening with it now.

  5. #5
    Join Date
    May 2014
    Posts
    80

    Default

    Resetting the cuda was not the answer.

    The original Apple hard drive was a 2 GB scsi'd. A PC tech guy friend said he may have an old SCSI 2 GB hard drive.

    Or on the other hand he also thought that with the Mac SCSI drive setup for this machine he could try removing the dead drive and attach the connector of the ribbon cable to the second drive and see if it will boot.

    Here's hoping...

  6. #6
    Join Date
    Jan 2002
    Location
    NW Montana
    Posts
    8,197

    Default

    Or on the other hand he also thought that with the Mac SCSI drive setup for this machine he could try removing the dead drive and attach the connector of the ribbon cable to the second drive and see if it will boot.
    I'm remembering something about SSCI that is making me think you need to have a drive on the last spot on that ribbon your talking about. - could be wrong there

    I do know you need something at the end to set your ID and termination right. When I first learned about SSCI over 12 years ago it made no sense to me why I could not pull a good working hard drive from one computer and put it into another machine and nothing. I'm like why won't this work.

    It took me forever to learn or understand SSCI ID and termination. I thought I had a page of "SSCI do's and don't's" but I can't find it or it in an AppleWorks format and that will not help. I'll look here on the Guru's threads and I'll post it here if I find some thing that might be of help.

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