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Thread: Commodore 128D revive.

  1. #1

    Default Commodore 128D revive.

    Dear All,
    I am trying to revive an old Commodore 128D.

    It has two issues:
    ° the two CIAs are dead and I see that they are socketed (GREAT!!!!): can I use any MOS 6526 from any Commodore computer? I have some taken from dead Amiga mobos (hoping some of them are still good)... with these old computers I prefer to be veeeery carefull, asking what it could seem a very stupid question...;
    ° the internal floppy drive is not working and I am not sure if it's a problem of the CIA or not... I see it is connected through a separate card... anyway the bracket that closes the drive is loose and I do not have the required tech skills to repair it...
    1. if the floppy drive is connected to the CIA I could be lucky (I do not care if the bracket is loose or not: it's important that the drive works);
    2. in case the floppy drive is dead, were can I find one as a spare part?

    Thank you

  2. #2

    Default

    Yes, any 6526 should work.

    As far as the floppy drive, is this a D (plastic case, handle), or DCR (metal case)?
    I use my C128 because I am an ornery, stubborn, retro grouch. -- Bob Masse
    Machine room: http://www.floodgap.com/etc/machines.html

  3. #3

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    Quote Originally Posted by ClassicHasClass View Post
    Yes, any 6526 should work.

    As far as the floppy drive, is this a D (plastic case, handle), or DCR (metal case)?
    Hello,
    it's a D (the first one), not a Cost Reduction.
    Thanx

  4. #4

    Default

    Quote Originally Posted by flaviosr View Post
    1. if the floppy drive is connected to the CIA I could be lucky
    It is. So if you replace the CIA and the drive is OK, things should work.

    But did you already find out why your CIAs are dead? I can imagine that the one serving the Userport + IEC port is killed by static on the Userport. But the other handles the keyboard and is quite well protected. So I wonder what could have happened.
    With kind regards / met vriendelijke groet, Ruud Baltissen

    www.baltissen.org

  5. #5

    Default

    Amiga CIA are slightly different from C128 CIA! Amiga 8520 CIA has a different clock circuit than C128 8521/6526. It will work but there may be some bugs.

    GadgetUK made a video on it;
    https://www.youtube.com/watch?v=sC5Qon_B5-A

  6. #6

    Default

    Quote Originally Posted by Ruud View Post
    It is. So if you replace the CIA and the drive is OK, things should work.

    But did you already find out why your CIAs are dead? I can imagine that the one serving the Userport + IEC port is killed by static on the Userport. But the other handles the keyboard and is quite well protected. So I wonder what could have happened.
    PIC_20180513_145947.jpg
    I bought a used C128D so I do not know its story. I "only" made a check with a diagnostic card...
    And the issue is that also the 6510 should be dead... but... one step at a time! I will first look for the CIAs...

  7. #7

    Default

    The 6510?
    I use my C128 because I am an ornery, stubborn, retro grouch. -- Bob Masse
    Machine room: http://www.floodgap.com/etc/machines.html

  8. #8
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    Default

    The CIA's are listed bad if you don't have the diag harness connected.
    What happens when swap the 2?

    Also, do you also have a c64? If it has sockets then you can try the cia out of it.

  9. #9

    Default

    Quote Originally Posted by ClassicHasClass View Post
    The 6510?
    PIC_20180513_150207_00001.jpg

    Yes... the 6510! The C64 CPU... first of all I want to solve the CIA issue (so that I can check the general HW) and then I pass to the 6510.
    I have several C128/C64 and I am going to make some switches...

  10. #10

    Default

    Quote Originally Posted by dabone View Post
    The CIA's are listed bad if you don't have the diag harness connected.
    What happens when swap the 2?

    Also, do you also have a c64? If it has sockets then you can try the cia out of it.
    mmm... I have not tried to swap the two... I have anyway another C128 in maintenance that have "good" CIAs and 6510... I am going to make some swap.
    All the harness was connected. This is not the first C128/C64 that I check!

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